Incorrect valve lash
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Finding zero lash is finding the absence of resistance, so I can't see how it helps to have more resistance. Have you taken a hydraulic lifter on the bench and tried to push the cup down?
But 'nuff said from me on the topic overall - to each to their own
But 'nuff said from me on the topic overall - to each to their own
Last edited by billla; Sep 21, 2010 at 11:08 AM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
Actually, you search for the point where 'resistance' is just encountered. That is where the spring [and oil thickness] begin to come into play. Now, if you can identify that point before you actually get there, you are a better mechanic than me.
Either way...it's all good.
Either way...it's all good.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
I guess it's what you mean by "resistance" - the first hint of drag indicates the absence of clearance between the lifter cup and the rocker cup, tranmitted by the pushrod - so the cup does not actually move. I think we'd agree that any movement of the lifter cup is by definition preload.
Getting zero lash right as the starting point to preload is the key; not getting this right is the most common cause of issues - regardless of the engine positioning method used. And regardless of the method for finding it, folks taking a little time on a Saturday to just play with zero lash, really get a feel for it is time well spent - better if there's someone standing there with them.
You're right, it's all good and there is definitely more than one way to skin a cat.
Getting zero lash right as the starting point to preload is the key; not getting this right is the most common cause of issues - regardless of the engine positioning method used.
And regardless of the method for finding it, folks taking a little time on a Saturday to just play with zero lash, really get a feel for it is time well spent - better if there's someone standing there with them.You're right, it's all good and there is definitely more than one way to skin a cat.
Last edited by billla; Sep 21, 2010 at 12:35 PM.
