How many miles on the engine? 60-70K miles or some multiple of that will almost
definitely spell rebuild time.
Warm the engine ever so gently, then drain the oil and inspect it for bronze
flakes, or for that matter, any other kind of metal flakes. If there is any
of metallic sediment sinking to the bottom of a jar or pan, you can bet it is a
worn out bearing that is responsible. The noises you hear are very likely then
connecting rod knock. Avoid running the engine at all. Once the first bearing
is flattened the engine will lose all oil pressure and is subject to major
destruction if something breaks. If nothing has been broken, the rebuild will be
simple and inexpensive. On the other hand, if one were not as smart as you, and
not shut the engine down NOW, you just would not believe the extent of the
that can result.
A leisurely rebuild starting now will make a nice winter project that will be
completed well before spring. Besides with all the bored listers mulling about,
you'll get loads of e-mail help.
Robert Haigney wrote:
> I'm a new MG owner, I purchased a 69 MGB-GT, I'm having a problem and was
> wondering if anyone knew what it might be, there's a knocking noise, it
> just recently, I haven't driven the car since it started, the noise seems to
> coming from the behind the engine and in front of the gear box, their is no
> problem changing gear and the car turns over fine, if you rev. the engine the
> knocking noise starts, and it's there when the car reaches a higher rev count
> in any gear (you can't go over 35 mph), you can't hear the noise when the car
> is idling, I had a mechanic look at it (not an MG man), he seems to think its
> the rod's in the engine, but I'm not sure, the sound doesn't seem to be coming
> from the engine, anybody have any ideas....?
> Thanks, Robert.