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Old 09-22-2004, 22:32   #1 (permalink)
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Roller rockers install

When I put aftermarket roller rockers in do I keep the shim thats under the stock rockers? I tried the first set without it and it started to open the valve before the bolt was tight. I'm guessing I do need to leave it there but just want to make sure I dont need other parts or anything stupid like that. I'll install them but leave the rocker cover off for now till someone can tell me. BTW the drivers side rocker cover is a pain to get off.
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Old 09-22-2004, 22:40   #2 (permalink)
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Re: Roller rockers install

Did you remove the upper manifold?
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Old 09-22-2004, 22:43   #3 (permalink)
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Re: Roller rockers install

Yeah you have to
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Old 09-22-2004, 23:48   #4 (permalink)
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Re: Roller rockers install

NZ, I don't recall using shims when I installed my Crane FMS rockers. I can have a look in the box when I get home (I kept all the old bits) for the old shims if you like. Are you sure you have the offending cylinder at TDC ie you're not tightening down on a cam lobe are you?
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Old 09-23-2004, 02:28   #5 (permalink)
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Re: Roller rockers install

With stock heads and cam they should go on without any shims. Make sure you are on the cams base circle (the way I do it is to rotate the engine until the exhaust valve opens and closes, just as the exhaust closes, the inlet opens. Once the inlet closes fully you are on the cams base circle), then follow the YT instructions to set the preload correctly. You may need shims but it is unusual with the stock parts.
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Old 09-23-2004, 03:12   #6 (permalink)
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Re: Roller rockers install

Well it may not be a shim as such it was a peice of metal with the edges bent up which sat on the pedistal and then the stock rockers sat on that.

BTW the stock rockers are such shit! I'd change the rockers to aftermarket ones just for that reason!
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Old 09-23-2004, 17:19   #7 (permalink)
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Re: Roller rockers install

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Originally Posted by NZ
Well it may not be a shim as such it was a peice of metal with the edges bent up which sat on the pedistal and then the stock rockers sat on that.

BTW the stock rockers are such shit! I'd change the rockers to aftermarket ones just for that reason!
NZ I thought that piece was a positioning plate.
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Old 09-23-2004, 18:22   #8 (permalink)
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Re: Roller rockers install

Ah ok.

I just made a phone call to YellaTerra. They said throw it away. The valve opening is just the pre load.
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