Re: TECH:Trying to confirm rod knock

["Dave Ewing" <rabbit16v@prodigy.net>]

While you have the pan off, drop the rod bearing caps and plastigauge them.
I would also plastigauge the mains too.  IF you see any copper in the
bearings (rods or mains) I would slap a new set in.  You CAN swap in main
bearings with the trans installed, just have to be very careful and don't
pull all the main caps at the same time!!!!  Tap the old top bearings out
with something plastic then tap the new ones back in the same way.  Easiest
way is to do one at a time.  Make SURE before you go through all of this
that the crank is smooth.  Any other questions LMK!

Dave

> the patient: 88 cabriolet 1.8 8v (all stock).
> the symptoms: start the car and everything sounds fine at idle. slight
> ticking from the hydraulic lifters, but nothing out of the ordinary.
> rev the car, and it still sounds normal. get it and drive the car up
> the block still normal for about 1/2 mile, then a dull knock knock
> knock that varies with engine speed. used a mechanics stethoscope and
> the sound is apparently coming from the vicinity of the oil pan/
> automatic transmission.
>
> I pulled off the oil pan and could not see anything out of the ordinary
> (with my untrained eye, that is). connecting rod bolts are all there,
> and torqued, at least...
>
> Should I go further and pull of the rod bearing caps and inspect the
> crankshaft? I figure if a rod is knocking it's "gonna leave a mark."
> Has anyone used the "ground out the spark wire trick"?
>
> Or could it be entirely something else?
>
> TIA,
> chrisg
> '82 8v
> '88 16v
>
>
>
>
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