Valve lash ajustement while engine running - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 18th, 08, 07:34 PM Thread Starter
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Patric
 
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Question Valve lash ajustement while engine running

I, i have a chevrolet 350 engine with hydraulic camshaft, and i was told that i could ajust valve while engine is running. I have deflectors and i was told to slack nut until it's noisy, retight until noise dissapear and then retight 1/2 of turn. Is this right

Thank you
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post #2 of 6 (permalink) Old Aug 18th, 08, 08:02 PM
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Tim
 
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Re: Valve lash ajustement while engine running

yup, it's pretty simple.

slow the idle screw as low as the engine will let you.

Do the 1/2 turn of preload slow. You'll get the hang of it.

I always keep big rags on everything to contain oil. Sometimes this causes a problem too

Tim Smith
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post #3 of 6 (permalink) Old Aug 18th, 08, 08:43 PM
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Jeff
 
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Re: Valve lash ajustement while engine running

I have an old valve cover with a slot cut in it to keep the oil running back down in the motor and off the headers.

Jeff
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post #4 of 6 (permalink) Old Aug 18th, 08, 08:52 PM
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Re: Valve lash ajustement while engine running

A set of old tin tappet covers, a slot cut out of the center above the adjusting nuts, but covers the end with the push rods
silcone gaskets in and long stem bolt downs.

other wise u have a big mess.

Note: u need a set of covers, the left and right line up different.

back off till just hear the "clack" then tighten down till clack disappears then
1/2 to 3/4 turn down
Tighten slow otherwise u u will stall the engine.

If u have a noisey lifter before u start, identify it before adjusting any others, if its your 1st time its easy to be listening to the wrong sound
To id it..with covers on, engine running, use a long screwdriver (or mechanic stethoscope) put end of screw drive on the tappet cover and the other end firmly to your ear, then move up and down the cover, this will locate the side/ approc where the tappet is
With covers off, again use screwdriver/stethoscope in the area to top of adjustment nuts

My Spelling is not incorrect...it is creative

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post #5 of 6 (permalink) Old Aug 18th, 08, 08:59 PM
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george
 
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Re: Valve lash ajustement while engine running

no need to add the 1/2 turn while running.Zero lash the clatter across the board and then shut down.Add a 1/2 turn and while your installing the rocker covers the plunger will give up and center itself.There really is no need need to run lash with an oem hydraulic shaft.This can be done at rest unless you like to see oil spewing out for peace of mind.

George
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post #6 of 6 (permalink) Old Aug 18th, 08, 09:24 PM Thread Starter
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Patric
 
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Re: Valve lash ajustement while engine running

just did it and seem to be ok
thank you
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