You really need toadd more detail,butfrom what you have stated I would
venture a guess.
Check your motor mounts. I realize you have an earlier car and personally
I have never seen an early one fail, But that is my guess. See if the
symptom goes away when you drive in reverse.
At least it will give you somethin to rule out.
Steve D
> Hello listers,
> My car is a 74 MGB with a rebuilt engine. The engine has less than 10000
> miles on it. The rebuilders have alot of experience with LBCs, and
> recommended using 10w40 full synthetic whenever possible. That's hard to
> find around here, so I've been settling for Valvoline Durablend 10w40. A
> friend offered to get me some Red Line synthetic, so we got 10w30
> because of Red Line's recommendation to use that viscosity for basic
> all-around driving. I added the oil and everything seemed ok until today.
> This afternoon, I had to stop at a light and noticed an unusual amount
> of vibration from the engine, as well as an abnormal rumbling. I feared
> that the oil might have caused some issue inside the engine, and
> examined the alternator just to make sure that it wasn't part of the
> noise. It wasn't. I drove a short distance to an oil change place and
> had the oil drained and replaced with the usual Durablend, but the
> vibration was still as bad as before. I called for a tow truck to get
> the car home. By the time we arrived at the oil change place, the
> vibration was present while the engine was under load, which had not
> been the case before.
> My father's not a professional mechanic, but has alot of experience with
> many different cars. He doubts that I've done any real damage because
> the difference in oil viscosities is so small. He suspects that a valve
> has become misadjusted. I adjusted them to spec while the engine was
> cold about 2000 miles ago, but don't rule anything out.
> I'm beginning to suspect the gearbox. After getting home, the wrecker
> dropped the car in the street and I prepared to drive it into the
> garage. The engine seemed smooth as usual before I put it into gear, but
> upon putting it into first and engaging the clutch, a lot of vibrating
> and rumbling started and didn't stop until I stopped the car. I'll check
> the gearbox oil after it's had time to cool, but at the least there is
> oil present.
> Any ideas on what's wrong with my car? If I think of anything else that
> might have contributed, I'll post it. Thank you for your help, and to
> those in the US, enjoy your holiday.
> -William Killeffer
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