351w- rocker question
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
351w- rocker question
I was tinkering around with my motor the other day and looked at something that I really wasnt sure of. On my motor, I am able to lift the front of the rocker off of the valves. Different ones give me different heights. On the motor that I tore out of the old plow truck, the rockers dont move at all. How should it be? A little movement, or none?
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
Has never been run yet, so the only way to know if they are installed right is to wait until i get it in and up to oil pressure? Its some more than others, but its not more than a 1/4 in on the highest. On two i believe, no motion occurs.
Tuned
Joined: Aug 2004
Posts: 269
Likes: 0
if the lifters are new, or drained of oil, submerge each lifter one by one in a coffee can full of oil. then push on the lifter with a pushrod cycling it up and down several times. reinstall the lifters and pushrods, and rocker arms. i make sure the valve is closed, and tighten the rocker while spinning the pushrod with my finger. once it is tight enough where i can no longer spin the pushrod, i tighten it down about 1 more full turn. then move onto the next one, ensuring the valve is closed on the rocker i am working on.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Well with everything assembled the cam has some valves held open to various degrees and some closed so you really shouldn't be able to move about half of them, but those on or close to the base of the cam(not on the lobe) can be somewhat loose. Do the lifters that you can raise spring back when you let them go or are they loose and flopping around all the time?
Thread Starter
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Cargo Master
Joined: Oct 2008
Posts: 2,308
Likes: 1
From: Elyria, OH
Nothings loose on them, i just noticed that the rockers off of the motor we took out of the donar truck didnt move at all and thought there may be a problem here... They all snap back when lifted.
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Postmaster
Joined: Jan 2009
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Is everthing stock on the valve train ??? Pre oil it before you put it in & turn it over a few times by hand... lew
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