Valve preload Q's

[CavScout]

I've run this through the search and did the reading. So, to put it short, as I understood.

The most betterest way to do this with the engine in, is to rotate the engine via the flywheel. As the distributor reaches each point on the cap, preload that cylinder, then move on to the next.

Is that assumption even close?

 

[bigtime]

If you are talking valve adjustment.
Adjust the exhaust valve when the intake valve is closing .
Adjust the intake when the exhast valve starts to open.

 

[CavScout]

Danke. So get it around the point then look to see which is opening and load the opposite. Then do the same to next.

 

[bigtime]

If it is the first time I am adjusting them, I just put my
finger on the pushrod side of the rocker as I bump/turn
it. When I feel the exhaust start to move I adjust the intake,
then after I adjust the intake I just watch it open and
then start to close. Then adjust the exhaust and so on...........

 

[Christian Dionne]

The most betterest way to do this with the engine in, is to rotate the engine via the flywheel. As the distributor reaches each point on the cap, preload that cylinder, then move on to the next.

That's one of the easiest way to do it. Make sure your looking at the correct TDC for #1 if you're reinstalling the distributor. The second mark you pass, of the two that are near each other on the damper is the one. If the distributor is already in correct time, then just watch the rotor line up and adjust both valves at once. Quickest way to do it and only have to rotate engine twice.

 

[bigtime]

The most betterest way to do this with the engine in, is to rotate the engine via the flywheel. As the distributor reaches each point on the cap, preload that cylinder, then move on to the next.

That's one of the easiest way to do it. Make sure your looking at the correct TDC for #1 if you're reinstalling the distributor. The second mark you pass, of the two that are near each other on the damper is the one. If the distributor is already in correct time, then just watch the rotor line up and adjust both valves at once. Quickest way to do it and only have to rotate engine twice.

Might be the easiest BUT not the most accurate. Depending on your
camshaft profile you could be adjusting a valve that is still on a ramp.
the way I described guarentees you are on the back of the lobe.

 

[ed hess]

then again you could use the method i used.

1 open service manual

2 find page for adjusting valves

3 read directions

4 adjust valves

note keep re-reading directions as you adjust the valves.

wtf do i know! but hey it worked for me.

ed

 

[Christian Dionne]

Might be the easiest BUT not the most accurate. Depending on your
camshaft profile you could be adjusting a valve that is still on a ramp.
the way I described guarentees you are on the back of the lobe.

Well, it may be the most accurate, but the last time I checked, we aren't running NASCAR or ProStock cams in our SyTy's. If you have a cam profile with the intake not closed yet or the exhaust starting to open at TDC, then you have a problem. Whatever floats your boat :roll:

 

[Lynn D. Brown]

If U happen to have one of those degree wheels on the crank, the easy foolproof way is to just rotate the crank from #1 TDC around to the TDC's of all of the other cylinders following in the firing order. Then U do the Intake and Exhaust on each cylinder that U R sure is @ TDC.

Probably tougher to do with the engine all assembled. I feel a little vague trying to tell when some valve is "starting to open or close".

 

[93ty475]

Re: Valve preload Q's

For the third time, this post helped me get another 4.3 turbo started a couple of days ago....I always forget the sequence (hence the search) but what Bob says above is the only way to adjust lifters on these trucks...I do a half turn after zero ....using the mark on the balancer is asking for trouble....Thanks again Bob!!


TTT

 

[93ty475]

Re: Valve preload Q's

If it is the first time I am adjusting them, I just put my
finger on the pushrod side of the rocker as I bump/turn
it. When I feel the exhaust start to move I adjust the intake,
then after I adjust the intake I just watch it open and
then start to close. Then adjust the exhaust and so on...........

..

 

[CavScout]

Re: Valve preload Q's

Good to know that I am not the ONLY moron here.

(I was feeling kinda lonely...)