Larry Hoy is probably right - bearing problem. First, though, check all
your exhaust system clearances, and your driveshaft U-joints. They can make
similar noises, and it is hard to locate the noise.
Julie Ann Phillips wrote:
> I recently purchased a nice restored 74 cb mgb.The previous owner stated
> the engine was rebuilt 8000 miles prior to the purchase.The engine
> always rattled a little on start up but my "foreign car specialist"
> assured me this was normal.I have only driven the car about 100 miles in
> the 2 months i've owned it.Today the engine started to rattle LOUD as i
> was driving it as soon as i relized it was the engine and not something
> in the transmission,which was my first guess i shut it off.I removed the
> valve cover and everything is intact and the" rattle now knock" is in
> the bottom end.Will someone tell me what it most likely is?Will i be
> needing a new engine?Thanks for any help you can offer.......
>
> Greg
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