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Decompression Device Not working--won't turn over compression

Have adjusted valve lash and followed numerous methods, none of which work

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  • Cars & Trucks Master
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It would be nice to know what type of engine that we are referring to. Sounds like that it is ether a motorcycle, stationary diesel or old tractor motor.

Posted on May 02, 2015

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Posted on Jan 02, 2017

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Need to know valve adjustment for 2012 ram 3500 turbo deisel and do you have to adjust the exaust valve n if so what is the spe. Tk. Joey


The 24-valve overhead system is a "low-maintenance"
design. Routine adjustments are no longer
necessary, however, measurement should still take
place when trouble-shooting performance problems,
or upon completion of a repair that includes removal
and installation of the valve train components or
injectors.
(1) Disconnect battery negative cables.
(2) Remove cylinder head cover (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - REMOVAL).
(3) Using the crankshaft barring tool #7471-B,
rotate crankshaft to align damper TDC mark to
12:00 o'clock position.
(a) If both number one cylinder rocker levers are
loose, continue to next step.
(b) If both number one clylinder rocker levers
are not loose, rotate crankshaft 360 degrees.
(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. Measure the valve lash by
inserting a feeler gauge between the rocker arm
socket and crosshead (Fig. 32). Refer to VALVE
LASH LIMIT CHART for the correct specifications. If
the measurement falls within the limits, adjustment/
resetting is not necessary. If measurement
finds the lash outside of the limits, adjustment/resetting
is required.
VALVE LASH LIMIT CHART
0.152 mm ( 0.006 in.)
MIN.
0.381 mm (0.015 in.)
MIN.
0.381 mm (0.015 in.)
MAX.
0.762 mm (0.030 in.)
MAX.
note:
If measured valve lash falls within these
specifications, no adjustment/reset is necessary.
Engine operation within these ranges has no adverse
affect on performance, emissions, fuel economy or
level of engine noise.
(5) If adjustment/resetting is required, loosen the
lock nut on rocker arms and turn the adjusting screw
until the desired lash is obtained:
² INTAKE 0.254 mm (0.010 in.)
² EXHAUST 0.508 mm (0.020 in.) Tighten the
lock nut to 24 Nm (18 ft. lbs.) and re-check the valve
lash.
(6) Using the crankshaft barring tool, rotate the
crankshaft one revolution (360°) to align the
damper TDC mark to the 12 o'clock position.
(7) With the engine in this position, valve lash can
be measured at the remaining rocker arms: INTAKE
3-5-6 / EXHAUST 2-4-6. Use the same method as
above for determining whether adjustment is necessary,
and adjust those that are found to be outside of
the limits.
(8) Install the cylinder head cover (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).
(9) Connect the battery negative cables.
need-know-valve-adjustment-2012-ram-3500-figxbmoxwg4zobk0gpscxd31-1-0.jpg

Jun 14, 2016 | Cars & Trucks

1 Answer

When the valves are adjusted on the de-compression stroke can they be re-adjusted or is the head now faulty?


valves should always be adjusted with the cylinder being adjusted at top dead center(tdc). if you can rotate the motor by hand you can adjust the valves with no damage having being done.

Jul 29, 2014 | 1992 Toyota Pickup

1 Answer

Easy way to adjust valve lash on ford 262?


Hot Intake Valve Lash: 0.019"
Hot Exhaust Valve Lash: 0.019"

Cold Intake Valve Lash: 0.019"
Cold Exhaust Valve Lash: 0.019"

Setting valve lash while HOT is the preferred method.
This was from a 1963 Ford manual,,

Sep 26, 2011 | Ford F-100 Cars & Trucks

1 Answer

Well we tried adjusting the valves and then it will start and make a werid noise and then will be about to shut off and it doesnt sound right plezz can you help me? its a 1997 gmc 5.7 1500


With the Engine in the number 1 firing position, adjust the exhaust valves for cylinders number 1, 3, 4, and 8 and the intake valves for cylinders number 1, 2, 5, and 7.
Turn the valve rocker arm nut counter clockwise until the valve lash is felt in the valve pushrod.
Turn the rocker arm nut clockwise until all of the valve lash is removed (zero valve lash).
Zero valve lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more up and down movement of the valve pushrod.
When all the valve lash is removed, then turn the valve rocker arm nut clockwise 1 additional turn (360 degrees).


With the engine in the number 6 firing position, adjust the exhaust valves for cylinders number 2, 5, 6, and 7 and the intake valves for cylinders number 3, 4, 6, and 8.

Follow the same steps as above.

Apr 01, 2011 | GMC Suburban Cars & Trucks

1 Answer

Rocker arm torque specs on a 97 gmc jimmy 4.3


  1. For the 4.3L engines which are equipped with screw-in type rocker arm studs with positive stop shoulders, tighten the rocker arm adjusting nuts against the stop shoulders to 20 ft. lbs. (27 Nm) on 1994-96 models and 18 ft. lbs. (25 Nm) on 1997-99 models. No further adjustment is necessary, or possible.
  2. For most 4.3L engines which are not equipped with screw-in type rocker arm studs and positive stop shoulders, properly adjust the valve lash. For details on valve lash adjustment, please refer to the procedure in Routine Maintenance . (see below)
4.3L Engine

The 4.3L engines may be equipped with either of 2 rocker arm retaining systems. If your engine utilizes screw-in type rocker arm studs with positive stop shoulders, no valve lash adjustment is necessary or possible. If however, you engine utilizes the pressed-in rocker arm studs, use the following procedure to tighten the rocker arm nuts and properly center the pushrod on the hydraulic lifter:
  1. To prepare the engine for valve adjustment, rotate the crankshaft until the mark on the damper pulley aligns with the 0? mark on the timing plate and the No. 1 cylinder is on the compression stroke. You will know when the No. 1 piston is on it's compression stroke because both the intake and exhaust valves will remain closed as the crankshaft damper mark approaches the timing scale.

Another method to tell when the piston is coming up on the compression stroke is by removing the spark plug and placing your thumb over the hole, you will feel the air being forced out of the spark plug hole. Stop turning the crankshaft when the TDC timing mark on the crankshaft pulley is directly aligned with the timing mark pointer or the zero mark on the scale.
The valve arrangement is as follows:



E-I-I-E-I-E (right bank-front-to-rear) E-I-E-I-I-E (left bank-front-to-rear)

  1. With the engine on the compression stroke, adjust the exhaust valves of cylinders No. 1, 5 & 6 and the intake valves of cylinders No. 1, 2 & 3 by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turns.

  2. Rotate the crankshaft one complete revolution and align the mark on the damper pulley with the 0? mark on the timing plate; the engine is now positioned on the No. 4 firing position. This time the No. 4 cylinder valves remain closed as the timing mark approaches the scale. Adjust the exhaust valves of cylinders No. 2, 3 & 4 and the intake valves of cylinders No. 4, 5 & 6, by performing the following procedures:
    1. Back out the adjusting nut until lash can be felt at the pushrod.
    2. While rotating the pushrod, turn the adjusting nut inward until all of the lash is removed.
    3. When the play has disappeared, turn the adjusting nut inward 1 3 / 4 additional turn.

Sep 23, 2010 | 1997 GMC Jimmy

2 Answers

Overhead valves making noise like they need ajusting


Valve Lash ADJUSTMENT 1.6L Engines NOTE: Measure valve clearance with the engine cold.
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the valve cover.
  3. Set the engine to Top Dead Center (TDC) of the compression stroke for the cylinder to be adjusted.
  4. Check the valve clearance. The valve clearance specifications are as follows:
    • Intake valves: 0.005-0.007 inches (0.13-0.17mm)
    • Exhaust valves: 0.005-0.007 inches (0.13-0.17mm)
  5. After adjustment, tighten the locknuts to 11-14 ft. lbs. (15-19 Nm).
  6. Repeat for each valve to be adjusted.
1.8L, 2.0L and 2.5L Engines The 1.8L, 2.0L and 2.5L engines utilize automatic hydraulic lash adjusters to maintain proper valve lash at all times. Periodic valve lash inspection and adjustment is not necessary or possible. prev.gif next.gif

Sep 14, 2010 | 2000 Chevrolet Tracker

1 Answer

Need to know how to adjust the valves


On Vehicle Inspection If a clanging noise due to the lash adjuster produced immediately after the engine has started or during operation persists, perform the following checks:
  1. Check the engine oil, and add or replace if necessary.
    1. If the engine oil is low, the air drawn in from the oil strainer will be trapped in the oil passage.
    2. If the engine oil level is higher than the specified level, agitation of oil by the crankshaft could cause a large amount of air to enter the oil.
    3. A deteriorated oil contains a large amount of air, because the air, once trapped, is not readily separated from the oil. If the air trapped due to these causes enters the high pressure chamber in the lash adjuster, the air in the high pressure chamber will be compressed while the valve is in the opened position. The lash adjuster will be drawn too far in, and will produce noise when the valve closes. This is the same phenomenon that occurs when the valve clearance is adjusted to an excessive dimension. Fig. 1: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 2.0L, 2.3L, 2.4L and 2.6L Engines 86663205.gif
      Fig. 2: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.0L (12 Valve) Engines 86663206.gif
      Fig. 3: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.0L (24 Valve) Engines 86663236.gif
      Fig. 4: Check the valves with the white arrows, rotate the crankshaft 360°, then check the valves with the black arrows — 3.5L Engines 86663207.gif
      Fig. 5: Push the rocker arm to check if the rocker moves down or not — all engines except for the 3.5L Engines. 86663208.gif
      Fig. 6: Push the rocker arm to check if the rocker moves down or not — 3.5L Engines. 86663210.gif
      In this case, the normal condition will be restored if the air escapes from the lash adjuster.
  2. Start the engine and slowly race (accelerate the engine from idling speed to 3,000 rpm in 30 seconds and then decelerate it to the idling speed in 30 seconds) it several times (less than 10 times). If racing the engine causes the noise to die away, it means that the air has escaped from the high pressure chamber of the lash adjuster and that the lash adjuster has regained its normal functions.
    1. When the vehicle is parked on a slope for a long period of time, the oil in the lash adjuster will decrease. When the engine is started, the air might enter the high pressure chamber.
    2. After a long period of parking during which the oil in the oil passage goes away, it will take some time before the oil is re-supplied to the lash adjuster. Therefore, the air could enter the high pressure chamber.
  3. If any abnormal noise is not eliminated by racing, check the lash adjuster.
    1. Stop the engine.
    2. Set the engine so that cylinder No. 1 is positioned at the top dead center of the compression stroke.
    3. Press the rocker arm at the area indicated by the white arrow mark to check whether the rocker arm is lowered or not.
    4. Slowly turn the crankshaft 360°clockwise.
    5. In the same procedure as step "c'', check the rocker arm at the area indicated by the black arrow mark.
    6. Push down the rocker arm at a portion located right above the lash adjuster. If the rocker arm goes down readily, the lash adjuster is defective. Replace it with a new one in accordance with Step 4. In addition, when replacing the lash adjuster, be sure to remove air positively from the lash adjuster before installation. Then perform inspection in accordance with steps "a'' through "e'' to make sure that there is no abnormality. In addition, if the rocker arm is felt to be very stiff or cannot be pushed down when it is pushed, the lash adjuster is in the normal condition. Therefore, check for other causes of noise.
Bleeding and Checking When cleaning or checking the lash adjusters, use only clean diesel fuel. To test the lash adjusters, follow this procedure.
  1. Immerse the lash adjuster in clean diesel fuel.
  2. While lightly pushing down the inner steel ball using a small wire, move the plunger up and down four or five times to bleed air. The use of the retainer facilitates the air bleeding of the rocker arm mounted type lash adjuster.
  3. Remove the small wire and press the plunger in. If the plunger is hard to be pushed in, the lash adjuster is normal. If the plunger can be pushed in all the way readily, bleed the lash adjuster again and test again. If the plunger is still loose, replace the lash adjuster. NOTE: Upon completion of bleeding the air out of the lash adjuster, hold the adjuster upright to avoid the diesel fuel from spilling.
  4. After air bleeding, set the lash adjuster on the special tool (leak down tester MD998440).
  5. After the plunger has gone down somewhat 0.008–0.020 in. (0.2–0.5mm), measure the time needed for it to go down an additional 0.04 in. (1mm). Replace if the measured time is not between 4–20 seconds.
prev.gif next.gif

Sep 06, 2010 | 1991 Mitsubishi Mighty Max

2 Answers

What is the current correct procedure for setting valve lash on a GM 2.8L / 3.1L V6 ? I understand the procedure in the service manual and the Haynes manual has been updated to a new procedure. An engine...


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

Mar 02, 2010 | 1988 Pontiac Fiero

1 Answer

Roller lifter adjustment 5.7 chevy vortec 1999


Crank the engine until the mark on the damper aligns with the TDC mark on the timing tab and the engine is in #1 firing position.

To adjust a valve back off the adjusting nut until lash is felt at the pushrod. Tighten the nut until all lash is removed. This can be determined by rotating the pushrods with your fngers. When all lash is removed the pushrod will stop rotating. When all play is removed rotate the nut one full turn.

With the engine in #1 firing position the following valves can be adjusted:
Exhaust 1,3,4,8
Intake 1,2,5,7

Crank engine one full revolution - The following valves can now be adjusted:
Exhaust 2,5,6,7
Intake 3,4,6,8

Apr 14, 2009 | 1999 Chevrolet Tahoe

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