Kevin,
I'll tell you that what you described is my experience exactly. I found
bearing damage in my TR6. What I suggest to you is, since you have the
engine out already, go all the way. Keep in mind that the bearing problem
is most likely the result of a problem, not the cause. In other words, look
everything over for signs of wear.
As I went through the engine, I found the culprit. The DPO had either run
the car low on oil, or had not changed the oil often. When this was
happening, the camshaft rounded out two lobes. The metal had to go
somewhere. First stop was the filter, but my guess is that that was full,
so it ended up being bypassed. The metal ran through the engine, gouged the
bearings and crank.
Remember, if you can feel the gouge with your fingernail, it is deep enough
to require grinding and polishing. Do look everything over, you'll feel
better.
Eric
'76 TR6 -- Purchased for restoration. When the engine knocked, it was time
to begin. I'm now in the reassembly phase of the car. Engine reassembly
and body work left. My goal is another 6 or 7 months until it is finished.
After all, we have to drive 'em to enjoy 'em.
>>Greetings Roger and list members,
>> I've been following this thread closely while pulling out my motor the
>>last few days. My TR6 had the same symptoms you have described. Strange
>>noise that I thought could have been the timing chain slapping the
>>cover, worn gudgeon pin bushing, or worn rod bearing. It only started
>>making the noise after warm-up and increased as the oil pressure
>>dropped. The pressure started at 75 psi and ended up about 25-30 psi
>>when warm. I had 20/50 in it at the time and it has 72,000 on the motor.
>>I just pulled off the oil pan and found the rod bearing trashed on the #
>>4 connecting rod. Although my inexperience in engine rebuilding leaves
>>me still guessing as to whether the crank will have to be pulled, I have
>>a strong suspicion it will. I can feel the rough surface with my finger
>>around the journal.A friend and local lbc guru is coming by this weekend
>>to help me out. Roger, I sincerely hope you have a better ending to your
>>situation, and will offer the following advice. I was told to put in
>>heavier oil and do a rebuild in the winter, when I planned on installing
>>the O/D tranny. I never got to put in the heavy oil, as the noise got so
>>bad after only 10 or so more miles of driving that I thought I would be
>>coming home on the back of a truck.. If I had checked the bearings
>>first, The crank would probably be fine.....so, proceed with caution,
>>and I wish you good luck.
>>Kevin
>>CF55588U & O sooner than I thought
|