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Adjustment of lifters on a v8 chevy

I'm replacing head gaskets on a 350 chevy. I need to tighten the rocker arms. It has hydralic lifters. the book says take the lash out of rods and go one more turn. Thats too tight from past experience. What do the pros do with out starting motor with the lifter covers off?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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angelo63
  • 129 Answers

SOURCE: 1995 Jeep Grand Cherokee 4.0l lifter adjustment

this is the way i adjust tappets remove all spark plugs


153
-----------
624
draw this on a paper

u start with no1 get the valves rocking which means turn engine over by hand til no 1 rockers one rocker is going up and the is going down u may have to turn the engine back and forth slowly
to see it . once u have no 1 rocking u can adjust no 6 valves adjust them with a little clearance so the push rod still spins freely

next look at chart
1 rocking adjust 6
5 rocking adjust 2
3 rocking adjust 4
6 rocking adjust 1
2 rocking adjust 5
4 rocking adjust 3

once u have made these adjustments recheck firing order 153624
try and restart engine if it starts the turn all rocker ajuster a further 1/4 of a turn and your done u may have too wait a bit of time for the liffters to bleed down after u do final adjustment if it dont start

hope it helps please leave rating and if u need more help let me know

Posted on Dec 19, 2008

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SOURCE: tapping sound after changing all new lifters

What motor is it? Some of the V-6's will always make the noise no matter what you do! Gotta love GM for this!

Posted on Jun 08, 2009

  • 137 Answers

SOURCE: LIfter Noise.

The automatic valve adjustor not allow you to set the valve gap.If it is making bad noise then it needs replacement.When changing valve lifters, it is recommended that the lifters are allowed to "settle/seat" for a minimum of 30 minutes to allow excess oil to drain. If this recommendation is not followed, some valves will make contact with the piston, resulting in the valve to break at the collet groove. It is also ideal if the engine is allowed to rest over night before starting the engine for the first time. If possible, the engine should be hand cranked or turned by hand the first time.


Posted on Jul 23, 2009

  • 4044 Answers

SOURCE: Rocker arm failure

Did the timing belt break at one time? Aside from the obvious of it sounding like your son did what mine did and tried to race the vehicle beyond it's abilities if the timing belt broken at one time it may have damaged the valves. If the valve impacts the cyclinder it is possible that it can damage the rocker and cam. When you pull the head off this time have the head re-worked and valves replaced. This should solve the problem.

Posted on Sep 12, 2009

ourhowse
  • 2007 Answers

SOURCE: putting distributor back in the right way

Okay. Turn the engine untill you have the crank mark lined up with the 0 on the pointer. At that point, look at the valves on #1 cylinder. They should both be closed, or in the "up" position. If they aren't, you'll have to turn it one revolution, to get to compression stroke. Now, you're ready to put the distributor in. Take the top off the cap, and position it in the hole, so that the rotor lines up with #1 on the distributor cap. If it's a newer one, take a close look inside at where #1 actually is because the newer ones are off set a little. Now, tighten the cap on, and hook up the plug wires, one at a time in the proper order and rotation. When you try to start it, it should run where it is, but you may have to turn the distributor slightly one direction or the other to make it start. Try your best to keep it running for 20 minutes or so the first time so your gaskets will set. ( not always an easy task when the valves aren't adjusted, and antifreeze can still vapour lock on you) If you need to know more, let me know.

Posted on Nov 13, 2009

Testimonial: "Thank you , but still hoping i had it at tdc to start with when i set the rocker arms but checked comp good on all but #1 and #3 "

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The rocker arms need to be adjusted, they are not set to a specific torque, they use self locking "crimp" nuts to hold the adjustment, these nuts should not be used over to hold the adjustment replace them.. With the lifters fully "pumped" up tighten the rocker arms to "zero" lash, the turn them in an additional 3/4 turn, you are done.

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Before starting first put engine on #1 TDC compression stroke. Adjust #1 rockers such that you have zero lift (push rod will spin by hand but just barely), then tighten additional 1/2 to 3/4 turn in 1/4 turn increments with time for lifter to pump down between turns. A shop manual will tell you which others you can set at this same time (I forget). Then rotate engine one full turn and set the rest. I like to then run engine until warm and while at idle and using clips that cover the hole in each rocker arm where oil squirts out, I loosen each rocker one at a time (engine running) until rocker starts to click, then in 1/4 turn increments I tighten them for final preload depending on what lifters I am using--some need 3/4 turns to center lifter, some need total 1 turn. All this will be found in any cheap shop manual.

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Ok so ik I'm posting allot haha but does anyone know where or how to adjust lifters just found out mine r just now needed adjustment in near mount Vernon WA or a price at least haha


In engines with rocker arm valve systems, the procedure I'm familiar with is to remove a rocker arm cover, and (one at a time!) while the engine is running, slowly back off the rocker arm retainer nut or bolt just until you hear the lifter tapping, then tighten it a quarter turn. If you can identify a lifter that is already tapping, tighten its rocker arm slowly until it stops tapping, then adjust it. Do not over-tighten! This can damage the engine.

Listen carefully to how the engine sounds; if it starts to stumble when you tighten a loose rocker arm, you've gone too far. If you cannot get the engine to run well without tapping, you may have too much wear in the valve train and may be due for a head overhaul, or you don't have adequate oil pressure in the lifters in question.
Repeat until all rocker arms are done. Replace the rocker arm cover using a new gasket, then (in a V-engine), repeat the procedure on the other side of the engine.

Wearing safety goggles, or better yet, a transparent face shield, is strongly recommended. Sometimes oil will squirt out a considerable distance from the lifter side of the rocker arm during adjustment, and the direction is not readily predictable.

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Need to know how to adjust valve lash on a big block 454 with roller rocker arms and hydralic roller lifters ? A video whould really help


The old fashioned way was to connect everything up and tighten the nut on the lifters until you could no longer turn the pushrod and then add about a quarter turn. Cover the lifters with a rag then start the engine with the valve cover off and loosen one lifter at a time until you hear it clicking and then tighten just until the clicking stops. Do that on all lifters ona at a time. Whe complete go back and add one quarter turn to each lifter.

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1 Answer

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If your rocker arms are adjustable you can adjust that rocker arm by tighten it up a little at a time until tapping stops but,if the rocker arms are not adjustable or have a net lash then you will need to replace the lifter.

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I just replaced all of my hydraulic lifters and no compression!


Yes, you've overtightened the lifters causing the valves to not close completely. If you did not prime the new lifters before you installed them and tightened them with the engine off they are most likely collapsed. back off all of the rockers to just snug and make sure the engine is running when you readjust them. Usually you need to let new lifters sit in a can of oil for a while to fill up. I've used a syringe to fill lifters prior to installation. Did you replace the push-rods also? If so were they the same length as the originals?

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