I have a 86 Vanagon. It has low compression on one cylinder. I'd like to assure that the valves are closing correctly. How does one check/adjust the hydrolic lifter equiped valves.
thanks dave
hydrolic lifter adjust
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Piledriver
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To verify they are closing for your compression check, adjust ALL to .006 clearance just like doing a bug.
For the leakdown check, take the rockers OFF. (Jakes idea)
If the motor has sat around, it might have a little rust on the cylinder walls, and MAY get better as it runs.
The "right" way of preloading them depends on who you ask.
I check the radius on my screws, fix/replace as required, and give it 1/4 turn past contact, and then forget about it.
Some folks like to _leave_ a small clearance, as it assists in pumping the air out WHEN it gets in the lifters by providing a full stroke, at the minor inconvienence of bit more noise.
IIRC, the Bentley manual says something like 2.5 turns past contact, but I really can't remember at the moment, nor find my manual.
And how "low" is low? ARe they all close, or is one much different?
For the leakdown check, take the rockers OFF. (Jakes idea)
If the motor has sat around, it might have a little rust on the cylinder walls, and MAY get better as it runs.
The "right" way of preloading them depends on who you ask.
I check the radius on my screws, fix/replace as required, and give it 1/4 turn past contact, and then forget about it.
Some folks like to _leave_ a small clearance, as it assists in pumping the air out WHEN it gets in the lifters by providing a full stroke, at the minor inconvienence of bit more noise.
IIRC, the Bentley manual says something like 2.5 turns past contact, but I really can't remember at the moment, nor find my manual.
And how "low" is low? ARe they all close, or is one much different?
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
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fatsback
The original VAG repair manual says 2 full turns after contact to preload the lifters..
If they are trapped with air or they are bit worn. try to adjust 1/4 to 1/2 turn after contact.I adjusted my lifters today with the VAG method today with "ticking" noise as a result(2 full turns)...then i re-adjusted them with 1/2 turn and it was no noise from the lifters at all..
Check this link also:
http://www.bostonengine.com/articles/hydraulicll.htm
If they are trapped with air or they are bit worn. try to adjust 1/4 to 1/2 turn after contact.I adjusted my lifters today with the VAG method today with "ticking" noise as a result(2 full turns)...then i re-adjusted them with 1/2 turn and it was no noise from the lifters at all..
Check this link also:
http://www.bostonengine.com/articles/hydraulicll.htm