| [GMCnet] timing chain tension? [message #211699] |
Thu, 20 June 2013 14:02  |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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So how tight is tight on the timing chain? While trying
to figure out "the noise" I've been looking carefully
at the engine. Seems (to my completely ignorant self)
that there's more slop in distributor vs piston movement
than would be ideal. I'd also noticed some time ago that the
timing mark seemed to drift a bit when I was trying to set it
to install efi, but again, I've never done any of this stuff before.
I pulled the plate where the mechanical fuel pump used to be
and reached in and down as far as possible. I could pull the
chain outward maybe 1/8" or so, just below the upper gear wheel.
Is that normal, bad, ??
The engine was replaced about 12k miles ago per receipts,
supposedly by a reputable shop. The prior engine had a Cloyes
true roller chain installed by Tom Hampton not long before the swap,
but that doesn't appear have made it onto this engine :-(
Still no clue what "the noise" is, though I've found other
problems to worry about.
thanks
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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