Sounds like it could be piston slap. Does it go away or get fainter when the
engine is at operating temperature? If so, you are just a little out of
spec. If it always present, the space between the piston and the cylinder is
----- Original Message -----
From Ulix Goettsch <ulix at u.washington.edu>
To: spridgets <firstname.lastname@example.org>
Sent: Wednesday, August 23, 2000 1:52 PM
Subject: Brand new engine started knocking - need suggestions
> Fellow listers,
> I finally (after 2 years) got my new engine in the car and fired up for
> first time. It ran nicely and I drove it 2 or 3 times when I started
> hearing a noise. It sounds almost like the engine is a diesel.
> The sound doesn't seem to change with load, only with engine rpm. It
> very loud, no impending doom sort of noise, just a bad note to the engine
> sound. The knock is not a deep rumble, it's a lighter pitched knock, like
> Listening around the engine I can tell that the sound comes from inside
> engine, but opening the oil filler doesn't let it get louder. Using a
> rod as a stethoscope against the head or block doesn't help.
> the fan belt doesn't make the sound go away, nor does pushing in the
> make any difference.
> I pulled the pan and looked around, tried to wiggle the crank and rods,
> retorqued the rod bolts, made sure the mains are tight. Found that one of
> the legs of the oil pickup was rubbing against a crank counter weight and
> thought I had found the problem, but alas, the sound is still there.
> There was nothing exciting floating in the oil pan.
> When I built the engine, I had the crank measured, it only needed
> it was already 10 under. The big ends were resized, new pistons fitted by
> the shop, block bored to match, mains line honed.
> New parts were: pistons, bearings, cam, timing sprockets and chain,
> valve springs, complete rocker shaft with rockers.
> I fitted all the bearings, plastigauged the mains and rod bearings,
> crank end float.
> In troubleshooting, what I haven't done is pull the rod or main caps.
> I haven't driven or run it much since it started sounding like this, I
> know if there would be visible bearing wear yet.
> I would be grateful for any suggestions of what to check, even crazy
> I'm in the process of moving and can only devote so much time to this at
> moment. I want to drive this car so bad I can taste it.
> Ulix __/__,__ ___/__|\__
> http://www.mirafiori.com/~ulix/ '67 Sprite '74 X1/9