-----Original Message-----
From: Mike Lee - Team Banana Racing <mikel@ichips.intel.com>
To: shop-talk@autox.team.net
Sent: Fri, 9 Jun 2006 13:54:16 -0700
Subject: Engine tech: replacing lifters w/o changing cam?
<snip>
For the past couple of years, with a cold engine and cold outside
temps, I'd
get a metallic rapping that varied with rpm. It would usually
disappear pnce
fully warmed up, or if I put in the clutch and rev'ved it really hard.
Now,
however, it's starting to make the tapping noise all the time at
startup,
regardless of temps (though the rev'ving trick will still quiet it
down).
I'm pretty certain it's the lifters, as I don't think anything else
would make
a noise like that, but eventually go away (rod/main bearings noises
should be
continuous, and probably lower pitched, eh?).
Mike-
Jeeps of that era were sent from the factory with VERY loose piston to
cylinder wall clearance. Even when new those puppies knocked, or
actually "piston slapped" quite audibly.
You may want to decide if the noise is really lifters or pistons before
proceeding. Any tech familiar with Jeep products will be able to tell
you if it is indeed piston slap.
Without going to extremes, piston slap is not something to be easily
rectified.
Engine noises are why radios were invented...
Nick in Nor Cal
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