adjusting valve lash?
Thread Starter
Melting Slicks
Joined: Jul 2001
Posts: 3,335
Likes: 1
adjusting valve lash?
i went through the correct procedure. followed the order at top dead center. rotated 360. and then did the rest. i tightened them until i felt alittle resistance while spining the push rod, and then went an extra 3/4 of a turn to set the preload.
what confuses me is when i turned the crank 360 to finish the other rockers. the ones i had just finished were so loose i could rotate the rocker right off the push rod???????? what is going on here????? :crazy:
what confuses me is when i turned the crank 360 to finish the other rockers. the ones i had just finished were so loose i could rotate the rocker right off the push rod???????? what is going on here????? :crazy:
Burning Brakes
Joined: Aug 2000
Posts: 984
Likes: 1
From: Cincinnati OH
Re: adjusting valve lash? (sdixon)
When you rotated the engine, the lifters on bled down when encountering resistance while raising the pushrods. This is normal. Assuming your initial adjustment was correct, nothing to worry about and no need to redo them.
Burning Brakes
Joined: Aug 2000
Posts: 984
Likes: 1
From: Cincinnati OH
Re: adjusting valve lash? (sdixon)
Yup. Now the question is, when you originally found zero lash before pre-loading, were they collapsed at all then ? There's a light spring in the lifters to hold them fully "extended" even if they're fully bled down, but if you aren't careful you might unknowingly compress it. A lot of people do the adjustment with the engine running to avoid these issues, but that has it's drawbacks (like hot oil slinging all over the place).
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: adjusting valve lash? (sdixon)
I noticed this looseness when I adjusted my valves, so I readjusted them. Car wouldn't start because I tightened them too much and the valves were open all the time. Had to loosen and start all over again. Moral: adjust correctly once and all will be well.
Thread Starter
Melting Slicks
Joined: Jul 2001
Posts: 3,335
Likes: 1
Re: adjusting valve lash? (Bluevette85)
ya i did the same thing, readjusted them. so i will need to start over. after they have "bled down", how do i readjust them? should i loosen them all back up, and wait for the lifters to open back up?
Burning Brakes
Joined: Nov 2000
Posts: 1,117
Likes: 0
From: DFW TX
Re: adjusting valve lash? (sdixon)
If you have just put in 'new' lifters, you may have to re-adjust them after you get it started up and the lifters pump up. I found that I could NOT get them right until then.
[Modified by 92corvette, 10:28 PM 3/12/2002]
[Modified by 92corvette, 10:28 PM 3/12/2002]
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Re: adjusting valve lash? (sdixon)
ya i did the same thing, readjusted them. so i will need to start over. after they have "bled down", how do i readjust them? should i loosen them all back up, and wait for the lifters to open back up?
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: adjusting valve lash? (sdixon)
i went through the correct procedure. followed the order at top dead center. rotated 360. and then did the rest. i tightened them until i felt alittle resistance while spining the push rod, and then went an extra 3/4 of a turn to set the preload.
what confuses me is when i turned the crank 360 to finish the other rockers. the ones i had just finished were so loose i could rotate the rocker right off the push rod???????? what is going on here????? :crazy:
what confuses me is when i turned the crank 360 to finish the other rockers. the ones i had just finished were so loose i could rotate the rocker right off the push rod???????? what is going on here????? :crazy:
Let me know if I can help further.
Jake
