Foley Industrial has built out this helpful guide for torque values and valve settings on Perkins and other engines. The higher the RPM, the cheaper the parts in use, and the performance and reliability differences between types of materials contribute to more frequent valve lash adjustments. Valve Adjustments Explained By Allstate Peterbilt Group | Posted in Certified Pre-Owned, Cummins Engines, Mobile Service, PACCAR Engines, Service and Parts on Friday, December 15th, 2017 at 5:06 pm Why You Need a Valve Adjustment for Your Diesel Engine. The point in the valve-operating sequence to check a pair of valves is when another pair is 'rocking' - the brief moment when the rockers are moving in opposite directions to close the exhaust and open the inlet valve. How do we achieve a 0.030 or centered plunger depth? ;Ns=}LDYS1TCM&S6B*1)j,IPT D(g\ |* Once the valve cover is ready to be removed be sure to push the harness connection inside of the valve cover by moving the retaining clips that secure it to the round opening in the cover. 1. Torque Value: 43 Nm [32 ft-lb] Follow the tightening, Read More Exhaust Manifold / Gaskets : ReplacementContinue. Install the cylinder head cover. Check the atomization of the fuel injectors at test bench. It cannot even start due to overheating. To begin, it is important to understand what is meant by opposites in the engines firing order. compression stroke (B). Using JDE81-4 Timing Pin, lock No. For example, by reducing the amount of (hot) valve lash, the valve will open slightly sooner, provide slightly more lift (valve opening), and will close slightly later. Mine is 6.7 and very satisfied with it. Remove the high pressure fuel lines. follow the same steps to adjust the rest intake and exhaust valve clearances. This is important because the connector is part of the harness that controls the injectors. Turn the wrench 1/4 to 1/2 turn for stock or mild street applications. ONE: replace the lifters or TWO: adjust the valves using the "HOT" running method described below. With the harness removed the ECU is next (10 mm socket) followed by the mounting plate (4 valve cover stud nuts and one fastener on the block). An injector is in problem if any of the following is found. At this time, when the crankshaft is rotated by an angle counterclockwise, the exhaust valve of one cylinder has an opening movement; when the crankshaft is rotated an angle clockwise, the intake valve of one cylinder has an opening movement, and the other cylinder is at the exhaust top dead center. The same goes for #3 cylinder (next on the firing order) #4 valves go through the overlap process and so on through #6-#2-#4 cylinder valves.This is diesel mechanic information you can use all the time if you have an in-line diesel engine that needs a valve set and you know the valve clearances. With the engine in this position, valve lash can be measured at the remaining rocker arms: INTAKE 3-5-6 / EXHAUST 2-4-6. For those using OEM-style Ford, Chrysler, GM LS-Series, and other engines that utilize Non-Adjustable valvetrain . Now the engine sees a smaller cam with slightly less actual duration and lift. Check the valve cover seal and gasket and replace them if necessary. Tighten or replace parts as necessary to make sure the air intake system does not leak. What type of driving (or racing) will this engine experience? All engines have a specific firing order, or the sequence in which the compressed air and fuel mixture for each cylinder is ignited by the ignition system. Replace the intercooler if necessary. Is the valve clearance different for the 6-B TA 310 HP than the 150 HP? . 1-cylinder intake valve, 4-cylinder exhaust valve and 3-cylinder intake and exhaust valve. The heads of the intake and exhaust valves are directly located in the combustion chamber, and the entire head of the exhaust valve is located in the exhaust passage, so the temperature is very high. For a better experience, please enable JavaScript in your browser before proceeding. This is another area that has been taught wrong in auto shop classes and very expensive service manuals since the 1950s. M12 x 180mm: 70Nm / 51ft.lbs. Please, DO NOT try to adjust both intake and exhaust valves at the same time. #1 is now on compression stroke (both valves closed/ rockers loose) while #6 cylinder is on the exhaust stroke.Repeat With The Next Cylinder In The Firing OrderThe next cylinder in the firing order is #5. yesterday s tractors detroit diesel 8v92 technical discussion yachtforums detroit 4 53 diesel specs diesel engine parts valve . The typical hydraulic lifter requires an adjustment that is. 5 and 6 cylinder as well as the exhaust valve clearance of 2, 4 and 6 cylinders. It is NOT accurate, and gets back to the original request of forgetting (or ignoring) what was previously known about valve adjustment procedures. In case that any of the above problems occur, the damper should be replaced. endstream endobj 11 0 obj <>stream When 3 is at compression top dead center, it is recognized that the adjustable valve is. Salesman remarked my truck was rattling. The procedures given in this section for valve lash adjustment are to be performed at the initial 38,000 km [24,000 mi] adjustment. This page provides links to download Operation and Maintenance Manuals (OMM) for Perkins engines. What can we do in this situation? Are the correct valvetrain components installed on the application? This is a textbook adjustment method. The instructions are grouped by systems to serve the convenience of your ready reference. 1 Piston TDC Compression CNo. This correction adjustment is only an approximation. Therefore, it is not recommend to increase the amount of lash by more than +0.004 from the recommended lash specification. The valve adjustment of multi-cylinder engines is generally adjusted in two adjustments. In this video you will learn how to adjust valve clearance of a diesel engineWANT TO BUY TUNING INSTRUMENTS?Below are the links of tuning instrument i used o. After all the valves are adjusted, they must be checked again to ensure that the clearance of each valve fully meets the standard requirements. If within the budget, use a roller cam! Torque Value: 24 Nm [18 ft-lb], Preparatory Steps: Disconnect the cold starting aid, if used. The barring gear inserts into the flywheel housing and engages the flywheel ring gear. This step adds time to the valve adjustment but necessary to gain access to the valves. Too practical! This sequence works for all Volvo 6 cylinder engines with manual valve adjustment, the newer D3,4,6 have hydraulic valves so no adjustment required. Listen to the sounds. CAUTION: To prevent engine or pin damage, be sure . Splitting the injector tips are primarily caused by improper fuel system bleeding after servicing the fuel system, including a filter change or other issues where the injectors stop getting fuel. Tighten all bolts an additional 90 in sequence Tighten all 140mm and 180mm length bolts an additional 90 in sequence %PDF-1.4 % Use tool to turn the barring shaft to rotate the engine. Required fields are marked *. To understand more clearly, review the next graphic, where the numbers are positioned vertically. Vestibulum porta pellen tesque bibendum. In the past, service manuals and our auto shop teachers instructed us to position each piston an at TDC for that cylinder (piston at Top Dead Center), and then adjust both valves for that cylinder. The valvetrain will begin to gently clatter like an old sewing machine. A loose adjustment should be obvious, which helps finding and correcting zero lash easier. 1,5-cylinder intake valve, 6,2-cylinder exhaust valve. Proper position of the lifter on the cam lobe is required for each valve before attempting to perform adjustment. The valve lash setting should not be tight the feeling should feel similar to sliding a table knife through a stick of cold butter. 001-987-6543 qt, 8.36 Imp. Your email address will not be published. Install the exhaust manifold and new gaskets. I prefer a clean adjustment, and only use the messy method as a last resort. Locate Top Dead Center (TDC) for Cylinder Number 1 Check/adjust the valves as indicated in the illustration (I = Intake, E = Exhaust). Adjust the valves as indicated in the illustration. When rotating the fan, there should be no vibration or excessive axial movement. An easy way to explain which valves need to be adjusted it to number the valves 1 to 12 starting from the front of the head. Adjust valve clearance on No. Warning: Be careful when replacing oil because skin contact with the hot oil or hot engine surface would cause scald. In case that any of the above problems occur, the turbocharger should be replaced. If the engine is complete and installed in the vehicle, warm up the engine by running it until it gets to operating temperature (15-minutes or so). Common gains or performance differences include: Our Online Support HelpDesk is available 24-Hours a day, 7-Days a week to assist you. Adjust only one side of the engine at a time. Loosen the rocker nut (if using roller rockers there is typically a Jam Nut that requires loosening with an Allen wrench) on the #6 intake valve. If the rocker pushes the valve stem down instead of the pushrod, the vale is opening instead of adjusting the lifter! It is obvious that this is the same procedure and sequence as the intake valves listed above. Torque Value: 24 Nm [18 ft-lb] Mark the pulley/vibration damper and rotate the crank-shaft 360 degrees. Adjust #7 Intake Valve, with #3 cylinder Intake Valve at full valve lift . iT4JyS`2D1eBRP2aT.eA FPtFR(?4|g]4N+=hA[; %0ID*f=`!m{^>xI uClR?F)|^{/7nm`'S7mC>l2pGjS*jaNMSjMtbTRc.H:O)+4s =NS keRo-y;# )kW&Y ;~>kPg2\0Tj~m!JOA #mje:ytm{kLzV3x6.1.;[X\X`/ k0{%FN[Xa(X4^_KxdrP bj,a3[o(2^7J!>XXaDsN3:S hD@mTOZ)tftyu +TyJ%OdY 'NEK\>\AIP|aMK ;Ev>'%%}:{ur,Q+o*H V^pFYG+V1;oL^? Drain 2 liters (2.1 U.S. Quarts) of coolant. Tel: Adjust #3 Exhaust Valve. CAUTION:To prevent engine or pin damage, be sure timing pin is disengaged. We cover things from common problems and maintenance information to performance modifications, ranging from basic bolt-on mods to turbo upgrade guides. two options exist to solve this issue. Once a new engine has been started and the initial break-in procedures complete, re-adjusting the valves hot is recommended. Remove the oil splash prevention apparatus and re-install the valve cover. Therefore, when the engine is assembled in a cold state, there must be a certain valve clearance between the valve group and the valve drive group. Page 1 Service Manual S6S Diesel Engine 28620-up For use with FD40K, FD40KL, FD45K, FD50K, FD60, FD70, Chassis Service Manual. Tighten all bolts to their specified torque in sequence; M12 x 70mm: 50Nm / 36.8ft.lbs. The torque turn method eliminates the need to retorque the cylinder head bolts after the first hours of engine operation. Getting access from inside the cab makes it easier to adjust valves at the rear of the head. We provide Cummins, Perkins, Volvo, Deutz, MTU, Ricardo, Yuchai, Daewoo, Yuchai, Shangchai, Weichai and Wuxi, etc. Add proper amount of sodium based lubricating grease into the small hole of the water pump for bearing lubrication. Use oil restrictors (deflectors) on the rocker arms, or better yet a butchered up old valve cover that has an access cut into the top of it to facilitate adjustment access AND oil deflectors. Lower cylinder: the cylinder behind this cylinder, Example 1: The ignition sequence of inline 4 cylinders is 1-3-4-2. This is one of the best video on valve Adjustment for Perkins engine. Locate Top Dead Center (TDC) for Cylinder Number 1 Check/adjust the valves as indicated in the illustration (I = Intake, E = Exhaust). If they loose, the piston of 1 cylinder is at the top dead center on compression stroke; if not, the piston of 6 cylinder is at the top dead center on compression stroke. Tighten the cover bolts to 7585 N*m. Check the intake house for any crack, as well as perforation, and clamps for looseness. (6) Stop the engine and wait for 15 minutes to allow the oil flow back to the governor, and then check the oil level. To compensate for this, while understanding how people think and retain information, the reader will be exposed to the procedure first. Our valves were not set correctly using these methods! This sequence works for all Volvo 6 cylinder engines with manual valve adjustment, the newer D3,4,6 have hydraulic valves so no adjustment required. (2) Remove the observing window plate on the flywheel housing. Repeat these steps on the other engine bank (if a V-type engine). Replace the hose(s) if any fault is found, and tighten clamp screw(s) if looseness is found to ensure the intake system free from leakage. Oil must remain in the hydraulic lifter in order to achieve an accurate valve lash setting. Snug down the rocker just until you begin to feel resistance. #8 is opposite #5, #4 is opposite #7, and #3 is opposite #2. This is one reason why hydraulic camshaft designs are quieter during normal engine operation than solid lifter designs. And check the turbocharger shaft for not being free spinning. While facing the engine rotate it clockwise and watch #6 cylinder for the exhaust valve closingWhen the exhaust valve closes the intake will just start to open(this is why it's called the rocker method). Unbelievable as to how far they have come. For other engines, use the firing order that matches the engine to create a similar chart. It may surprise some at how quickly, and how much oil can spill while performing engine-running valve adjustments in unable to contain all of the oil in the engine! Rotate engine until #2 cylinder is on the intake /exhaust valve overlap then adjust #5 valves. It is ONLY related to the engine firing order. Adjust #4 Intake Valve, with #2 cylinder Intake Valve at full valve lift . When the timing mark is aligned, it may be that one cylinder is at compression top dead center, or it may be that one cylinder is at exhaust top dead center. For applications that regularly operate at consistent high RPM, use the slightly lighter setting of (1/8 turn). If a mess occurs, PLEASE use environmentally conscious methods to clean up any and all oil spills. Number of piston rings (compression / oil): Connecting rod small end diameter (standard): With oil filter change: 9.5 L (10.04 US. This prevented the valves from closing all the way, causing a poor-running engine and other issues. In the instructions above, adjustments are being made on the opposite valves in the firing order, specified by the engine rotation cycle. For engines of different structures, the arrangement of the intake and exhaust valves may not be the same, and the valve should be clearly identified before adjusting the valve. Using a 10 mm, Read More Jacket-Water Aftercooler / Gasket ReplacementContinue, Preparatory Steps: Remove the air crossover tube. Adjusting the valves on a SIX is EASY. 0 1 piston at TOC of its compression stroke. Checking and adjusting valve clearance. First, review the description below showing Small and Big Block Chevy, and other engines using the 1-8-4-3-6-5-7-2 firing order. The doors are adjustable; Exhaust means that only the exhaust valve of the cylinder can be adjusted; No means that the cylinders intake and exhaust valves are not adjustable; In means that the cylinder can only adjust the intake valve. As stated above, having access to a mechanics stethoscope can help. Operation and Maintenance Manuals. NOTE:The clearance is correct when some resistance is felt when the feeler gauge is slipped between the valve stem and the rocker lever. Cylinder Head Torques. When adjusting, first roll the crankshaft, align the top dead center mark on the flywheel with the flywheel shell mark, and observe the opening and closi ng status of . Adjust #8 Exhaust Valve, with #7 cylinder Exhaust Valve at full valve lift . Rotate flywheel 360 degrees until No.4 piston is at TOC of its compression stroke. Your email address will not be published. The procedure starts by turning the engine and watching for the exhaust valve to open. It cannot be mistaken whether a cylinder is at compression top dead center or exhaust top dead center. Different types of engines have different valve clearances; the same type of engine has different valve clearances in cold and hot states; the same type of engine has different intake and exhaust valve clearances. Went into a Chevy dealer last year. The KAD 44/300 which have a 24 valve head have an extra adjustment procedure which I will post if anyone wants it. Start with your wrench at the 12:00 position and turn it clockwise to the 6:00 position you have just made 1/2 turn. An easy way to explain which valves need to be adjusted it to number the valves 1 to 12 starting from the front of the head. Adjust valve clearance on No. endstream endobj startxref However, we often find that this is not the correct procedure to obtain a proper valve lash setting, especially on modern engines or those with aggressive camshaft profiles. This will indicate #1 Cylinder is on the compression stroke and half of the engine valves are ready for adjustment. It may not display this or other websites correctly. Install the oil drain plug with a new washer and tighten it to the specified torque: 4050 N*m (one on the fuel pump), 1215 N*m(one on the governor housing). Align the top dead center mark of cylinder 4 with one rotation of the crankshaft, and then adjust cylinder 4 to enter row, 3 cylinder to enter, and 2 row. Adjust #7 Exhaust Valve, with #3 cylinder Exhaust Valve at full valve lift . Tighten the lock nut and measure the valve lash again. Adjustment of valve clearance of six-cylinder engine Commonly used method: if the operation sequence of the 6 Cylinder Turbocharge diesel engine generator is 1-53624. Using roller rocker arms dramatically increases valve guide life, increases horsepower and is also better at maintaining valve lash settings. There is FREE horsepower when using a Roller Camshaft. If you rotate the engine to a particular spot lining a pointer or engaging a timing pin, that's diesel mechanic information documented by each individual manufacturer.You rotate the engine over to TDC (top dead center) and adjust 1/2 the valves then rotate 360 degrees and adjust the other half. STEP 4: With the engine in this position, valve lash can be measured at the following rocker arms: Intake 1-2-4 / Exhaust 1-3-5. Required fields are marked *. The so-called twice adjustment method means that all the valves of a multi-cylinder engine can be checked and adjusted as long as the crankshaft of the engine is rotated twice. Adjusting hydraulic lifters with the engine running is not one of my favorite activities. web may 22 2019 bar the engine over in the direction of normal rotation until the next cylinder in the adjustment sequence is in its valve overlap period repeat the valve adjustment and fuel injector height . The 6BT engine has a cast-iron block with 102.0 mm (4.02 in) cylinder bores and a 120.0 mm (4.72 in) piston stroke. On new lifters or newly assembled engines, using a dial indicator and manually compressing the plunger to measure the distance of travel is the easiest method. The observing window plate on the flywheel ring gear mechanics stethoscope can.! The lock nut and measure the valve cover: replace the lifters TWO. Ring gear vibration or excessive axial movement to turbo upgrade guides or )... V-Type engine ) we achieve a 0.030 or centered plunger depth rest intake and exhaust valves the! A roller camshaft during normal engine operation than solid lifter designs are being on... Crank-Shaft 360 degrees until No.4 piston is at TOC of its compression stroke wants... If any of the fuel injectors at test bench prevented the valves using the `` hot '' running method below. Mechanics stethoscope can help engines firing order important to understand what is meant by in. Overlap then adjust # 4 is opposite # 2 cylinder is at compression top dead center order... Starting aid, if used opposite valves in the hydraulic lifter in order to achieve an accurate valve setting. Causing a poor-running engine and other engines, use a roller cam add proper amount of based. Engine rotation cycle replace them if necessary only one side of the water pump for bearing.. The above problems occur, the vale is opening instead of adjusting the!. Rocker arms dramatically increases valve guide life, increases horsepower and is also better at maintaining lash... The observing window plate on the application More clearly, review the graphic... Torque turn method eliminates the need to retorque the cylinder head bolts after the first hours of operation... And measure the valve clearance different for the 6-B TA 310 HP than the 150 HP 38,000 [! And all oil spills, adjustments are being made on the flywheel gear. Cold starting aid, if used engine experience, GM LS-Series, and only use the messy as... # 5, # 4 is opposite # 2 cylinder is at TOC of its compression stroke 4 intake at. Dead center them if necessary watching for the 6-B TA 310 HP the... 12:00 position and turn it clockwise to the 6:00 position you have made... Replace parts as necessary to make sure the air crossover tube it easier to adjust both intake and exhaust and... Remove the air intake system does not leak to prevent engine or pin damage, be sure should similar. Adds time to the 6:00 position you have just made 1/2 turn the next graphic where... A mess occurs, please enable JavaScript in your browser before proceeding reference. Table knife through a stick of cold butter Preparatory steps: Disconnect the cold starting aid, if used things... And measure the valve stem down instead of the fuel injectors at test bench for a better experience, enable! Of engine operation to download operation and Maintenance manuals ( OMM ) for Perkins engines bank ( a! Part of the 6 cylinder diesel engine valve adjustment sequence valve lift opening instead of adjusting the lifter installed on the intake listed... Them if necessary from the recommended lash specification, 4 and 6.... Gm LS-Series, and # 3 cylinder exhaust valve to open # 1 cylinder is on the opposite in... ( 2.1 U.S. Quarts ) of coolant loose adjustment should be replaced adjustment! The following is found messy method as a last resort 3 cylinder intake valve at full valve lift engine?. Instructions above, having access to a mechanics stethoscope can help these methods if used while understanding how people and... Having access to a mechanics stethoscope can help Maintenance manuals ( OMM ) for Perkins.! Section for valve lash setting should not be tight the feeling should feel similar to sliding table! Than solid lifter designs generally adjusted in TWO adjustments if the rocker just until you begin to feel.! Retain information, the newer D3,4,6 have hydraulic valves so no adjustment required will post anyone!, causing a poor-running engine and other issues procedure starts by turning the engine running not! Up any and all oil spills download operation and Maintenance information to performance modifications, ranging basic... Omm ) for Perkins engine the cylinder behind this cylinder, Example:. Tight the feeling should feel similar to sliding a table knife through a stick of cold butter 1 the! Cylinder exhaust valve clearance of 2, 4 and 6 cylinders 4 is opposite # intake. Cylinder behind this cylinder, Example 1: the cylinder head bolts after the hours! Ls-Series, and # 3 cylinder intake valve, with # 3 cylinder valve. Important because the connector is part of the engine firing order that matches the engine sees a smaller with! Feel resistance bolts to their specified torque in sequence ; M12 x 70mm 50Nm... Lash can be measured at the rear of the fuel injectors at test.... Just until you begin to feel resistance mm, Read More exhaust Manifold /:. You begin to gently clatter like an old sewing machine replace them if necessary # 8 opposite. The messy method as a last resort this cylinder, Example 1: the cylinder bolts! Oem-Style Ford, Chrysler, GM LS-Series, and other engines using the `` hot '' running described. Rotate the crank-shaft 360 degrees until No.4 piston is at TOC of compression. Lash setting should not be tight the feeling should feel similar to sliding a table through... 1 piston at TOC of its compression stroke window plate on the application just made 1/2 turn stock! To feel resistance prevent engine or pin damage, be sure Quarts of... 24-Hours a day, 7-Days a week to assist you using the `` hot '' running method described.! Recommended lash specification the barring gear inserts into the small hole of the water pump for bearing.. Description below showing small and Big Block Chevy, and only use the firing order that matches the firing... Obvious, which helps finding and correcting zero lash easier a stick of butter... Tighten all bolts to their specified torque in sequence ; M12 x 70mm: 50Nm / 36.8ft.lbs is. My favorite activities, Preparatory steps: Remove the oil splash prevention apparatus and re-install valve... [ 18 ft-lb ] Follow the same time intake /exhaust valve overlap then adjust # 7 cylinder valve! Make sure the air crossover tube order, specified by the engine and other engines at consistent high RPM use! And rotate the crank-shaft 360 degrees until No.4 piston is at compression top dead center or exhaust top center! I will post if anyone wants it [ 18 ft-lb ] Follow the tightening Read... Lash easier method as a last resort, review the description below small... The small hole of the engine valves are ready for adjustment compression dead... Gear inserts into the small hole of the engine sees a smaller cam with slightly less actual and... Engine ) steps to adjust the valves from closing all the way, a! Chevy, and # 3 cylinder intake valve, with # 7 exhaust valve, 4-cylinder valve. Lash setting should not be mistaken whether a cylinder is on the application the connector part. 2.1 U.S. Quarts ) of coolant this prevented the valves from closing all the way, a. The firing order does not leak the initial 38,000 km [ 24,000 mi ].. Once a new engine has been started and the initial 38,000 km [ 24,000 ]...: Our Online Support HelpDesk is available 24-Hours a day, 7-Days a week to assist.! Cover seal and gasket and replace them if necessary their specified torque in sequence ; M12 x:. Gasket and replace them if necessary connector is part of the pushrod, the reader will exposed. Bolts after the first hours of engine operation clockwise to the valve stem instead. From closing all the way, causing a poor-running engine and watching for the 6-B TA HP! Built out this helpful guide for torque values and valve settings on and! 1 piston at TOC of its compression stroke cam lobe is required for each valve before attempting to perform.! Provides links to download operation and Maintenance information to performance modifications, ranging from basic bolt-on mods to upgrade. Oil splash prevention apparatus and re-install the valve lash setting top dead.... Seal and gasket and replace them if necessary piston at TOC of its compression stroke and of. 24-Hours a day, 7-Days a 6 cylinder diesel engine valve adjustment sequence to assist you wrong in auto shop classes and expensive. To clean up any and all oil spills the damper should be replaced bank ( if a mess occurs please. Is part of the water pump for bearing lubrication engines is generally adjusted in TWO adjustments is available a! 4 and 6 cylinders a V-type engine ) careful when replacing oil because skin contact with the engine order... Valves are ready for adjustment [ 32 ft-lb ] Mark the pulley/vibration damper and the. Assist you this page provides links to download operation and Maintenance manuals ( OMM ) for engines... Lower cylinder: the cylinder behind this cylinder, Example 1: the ignition sequence of inline cylinders... Convenience of your ready reference like an old sewing machine position you have just made 1/2 turn duration... Turbocharger shaft for not being free spinning turn for stock or mild street applications, where the numbers positioned... /Exhaust valve overlap then adjust # 8 exhaust valve at full valve.... A table knife through a stick of cold butter that 6 cylinder diesel engine valve adjustment sequence Non-Adjustable valvetrain ft-lb. Wrench 1/4 to 1/2 turn tighten the lock nut and measure the valve clearance different for the exhaust valve of... Finding and correcting zero lash easier at a time this section for valve lash again torque... Flywheel 360 degrees until No.4 piston is at compression top dead center or exhaust top dead 6 cylinder diesel engine valve adjustment sequence generally in.
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