Pre-loading lifters - Team Camaro Tech
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post #1 of 12 (permalink) Old Feb 20th, 01, 02:45 PM Thread Starter
 
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Anyone out there have an answer to this: How do you pre-load new roller lifters in a new (rebuilt) motor? Did a search with no results.
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post #2 of 12 (permalink) Old Feb 20th, 01, 04:53 PM
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Ken,
I am not certain exactly what you are asking ??? If you are referring to adjusting the valves, it is no different than any other hydraulic cam, assuming you are talking about a hydraulic roller. If youa re not familiar with the process, I would suggest the book "How to rebuild your Small Block Chevy" it is very thourough in all of the adjustments.

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post #3 of 12 (permalink) Old Feb 21st, 01, 08:39 AM Thread Starter
 
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No I'm not talking about valve adjustment..or rather, I am, but am referring to new lifters. I read somewhere that the lifters have to be pumped up with oil before the initial adjustment can be made.
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post #4 of 12 (permalink) Old Feb 21st, 01, 09:28 AM
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if i get you right, pumping them up happens when you start the engine the first time. there will be alot of valve noise for a few minutes and then as they get "pumped" up then you make the adjustments.

nate
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post #5 of 12 (permalink) Old Feb 21st, 01, 03:11 PM
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Ken,
It is not neccessary to pump up the lifters. If you preoil the motor, like you should, before you start it they will get plenty of oil. Most of the new lifter boxes I have seen lately actually tell you not to pump them up. The reason is that they could conceivably hold a valve open when you first start the motor.
Hope this helps,

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post #6 of 12 (permalink) Old Feb 21st, 01, 05:31 PM
 
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Don't you just use a prelube tool and a half inch drill and run it until oil comes out the rocker arm holes?? pdq67



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post #7 of 12 (permalink) Old Feb 22nd, 01, 03:28 AM
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that's what i thought too, pdq! but a few mechanics i've talked to say it's not adviseable(ms)to pre pump the oil pump. it could hang up a valve.
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post #8 of 12 (permalink) Old Feb 22nd, 01, 02:56 PM
 
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How the heck can you hang up a valve with the oil relieving itself up the pushrod??? pdq67



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post #9 of 12 (permalink) Old Feb 22nd, 01, 02:57 PM
 
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Back again!! Maybe that mechanic doesn't have a pre-lube tool??? pdq67



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post #10 of 12 (permalink) Old Feb 24th, 01, 07:22 AM
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that was my question to them, but they didn't really have the answer. i'm just like you i always turn the oil pump to get oil pumped through out the engine. but?????? be talking later, scott
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post #11 of 12 (permalink) Old Feb 24th, 01, 03:48 PM
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That must be the mechanic that replaces newly rebuilt engines every 2,500 miles or so.

OOOHHHH no it was'nt my fault, the engine must have been defective. I can get you another one and install it for the same price as the last one. Don't worry the engine is under warranty sir so all it will cost is you is labor again.

Boy what a racket some people have, then they try and convince others to do it like they do!!!
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post #12 of 12 (permalink) Old Feb 24th, 01, 05:01 PM
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A little late getting in on this one, but thought I'd try to help. When talking about preload you're talking about how much past zero lash you are adjusting your hydraulic lifters (roller or flat). Usually preload should be 1/2 to 3/4 of a turn on the adjusting nut past zero lash. Zero lash can be found by twirling the pushrod with one hand (easiest to do before you put on the intake manifold) and slowly tightening the rocker nut with the other - when a very slight resistance to the twisting is felt, that's zero lash. As for prelubing your lifters, just give them a good coating of the assembly lube that should come with them and pour a little oil over the top before you put the pushrods in. My Comp Cams instructions specifically said not to "pump up" the lifters before installation (that's different than prelubing an engine with a drill). I would highly recommend prelubing every new engine with a drill before firing it up the first time.
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