Lifter pre load
Thread Starter
On The Tree
Joined: Sep 2014
Posts: 184
Likes: 0
From: Albany,OR
Lifter pre load OK I have a vrx4 cam 243 heads and Ls7 lifters. I have been having a ticking noise and believe it's from the wrong length push rods. So I am going to be RE measuring them. I have found good right ups on it but I am still confused on the lifter pre load. The motor has been running so do I want to push down the try and get the oil out of the lifter ?
On The Tree
Joined: Jun 2015
Posts: 182
Likes: 3
From: Portland OR
A hydraulic lifter in order to be able to take up the gap that forms as the motor warms up and the block expands.
In order to do that it has to be compressed at cold rest (so it has travel to extend and take up any slack), This is what is known as preload.
It is generally in the range of .100", the depth can be measured or you can use an adjustable pushrod to zero lash it and then add the recommended preload.
In order to do that it has to be compressed at cold rest (so it has travel to extend and take up any slack), This is what is known as preload.
It is generally in the range of .100", the depth can be measured or you can use an adjustable pushrod to zero lash it and then add the recommended preload.
