I've seen a mechanic use a tool to change the upper half of main bearings
with the engine in the car. The thing is shaped like a bearing shell,
sort of, with a pin on it that engages the oil supply hole in the upper
bearing shell. Then the crank and the tool are turned together, and the
bearing spins out. Have never used it myself, but it looked easy when
the guy did it. I think the tool was a Lisle or one of the other
well-known handy tool makers. A trip to the parts store might turn up
such a useful item.
Bob
On Sat, 30 Aug 1997 17:27:20 -0400 (EDT) Arthur Pfenninger
<ch155@FreeNet.Buffalo.EDU> writes:
>On Sat, 30 Aug 1997, Scott Gardner wrote:
>
>>
>> > I am having problems with low oil pressure on my 70 Roadster and
>a
>> > friend visiting my neighbor from Australia said that what they
>used to
>> > do was to pull the oil pan and replace the main and con. rod
>bearings
>> > and it was good for another 40,000 miles.
>> >
>> > Has anybody else done this and is it prudent maintenance?
>> >
>> > Thanks for any advice.
>> >
>> > Warren Pruitt
>> >
>> > 70 MGB Roadster
>> >
>> Warren,
>> I think it would be a good idea to replace the bearings as
>you
>> described. Not all parts of the engine wear out at the same rate,
>> and I've heard 30-40,000 miles as a fair service interval for
>> crank/con rod big-end bearings.
>> Bear in mind that if replacing those bearings doesn't work,
>the cam
>> bearings may be worn, although they are supposedly pretty sturdy.
>> Check the rocker shaft for wear, as well.
>> Scott
>>
>
>
> It may as simple as your oil pressure relief valve being bad.
>It's
>a cheap fix. Per my previous post you can't replace the main bearings
>without pulling the engine. You need to remove the crank shaft to get
>the
>top of the bearings out, not to mention how hard it would be to try
>and
>pull the caps off while laying on your back.
>...Art
>
>
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