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Old 05-29-2011, 05:54 PM
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Valve lash

My 72 satellite sounds like it has an excessive amount of lash after the cam swap? Stock heads 318

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Old 05-29-2011, 08:44 PM
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Is this a hyd or solid lifter cam? Stock rockers or aftermarket?
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Old 05-29-2011, 09:57 PM
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Stock hydraulic, when I checked the rockers there is some play.don't know what's normal on these engines
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Old 05-29-2011, 10:20 PM
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Your 318 uses "net lash" lifter preload adjustment, so no lash or preload adjustment can be made unless you change the pushrod length, shim the rocker stands, or convert to an adjustable valve train. This is because the cam base circle is likely different along w/the possibility the head gasket being a different thickness than what it was originally. If the block or heads were milled, that changes the preload as well.
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Old 05-29-2011, 10:29 PM
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I was told by the manufacturer the base would be smaller. How do I know what length of pushrods to install? Stock heads and headgaskets
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Old 05-29-2011, 10:29 PM
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Should there be no lash on these engines?
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Old 05-29-2011, 10:53 PM
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Use an adjustable pushrod to determine the correct length. One way to accurately measure the length of a ball/cup pushrod is to insert a 5/16" diameter steel ball bearing in the pushrod cup and measure the whole thing with vernier calipers. Subtract 0.3125" from the measurement, and you'll end up with the pushrod length.

As far as how much preload to figure in, lacking any information to the contrary I'd use 0.030" to 0.050". IIRC that is roughly equivalent to 1/2 to 3/4 turn on a 3/8-24 rocker stud w/1.5 ratio rockers.
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Old 05-29-2011, 11:08 PM
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so there is supposed to be some play in the valvetrain then
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Old 05-29-2011, 11:18 PM
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Quote:
Originally Posted by badknuckles
so there is supposed to be some play in the valvetrain then
With hydraulic lifters, when the engine is running there will be no "play". But w/the engine is off, the lifters can bleed down and the rockers can appear loose on some valves. But if there is a lot of valve train noise when the engine is running- and the cam isn't going flat- the likelihood is the lifter preload is insufficient.
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Old 05-29-2011, 11:20 PM
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Quote:
Originally Posted by cobalt327
and the cam isn't going flat- .
this is what im hoping is not the case.............
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Old 05-29-2011, 11:36 PM
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Only drivers side
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Old 05-30-2011, 01:14 AM
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I may be the luckiest moron ever, header leak! Damn sounds like a valve noise
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Old 05-30-2011, 10:19 AM
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Quote:
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I may be the luckiest moron ever, header leak! Damn sounds like a valve noise
This doesn't change the fact that you should check for having the right length p-rods.
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Old 05-30-2011, 01:03 PM
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im having it checked
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Old 05-30-2011, 05:56 PM
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Took it in,i was told stuck lifter
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