Steve,
When my 70B had low oil pressure, I replaced the main bearings while I had
the engine and tranny out for an O/D replacement. The oil pressure has
stayed at 50 while running and 30 hot idle. Should be a 4 hour job start to
finish with help and air tools when possible.
It was a lot easier then doing the ring job on my 69C which we just lifted
the 6 cyl. up 6 inches off the engine mounts to get to the rods from
underneath. That was a ten hour job.(-; But we did have to hone each
cylinder and that took time. We took to many breaks from frustration )-;
Morale of the story is pull the engine... and replace the clutch componets
while your at it.
Jim
69C
70B
>From: Bob Howard <mgbob@juno.com>
>Reply-To: Bob Howard <mgbob@juno.com>
>To: sclifton@cfl.rr.com
>CC: mgs@autox.team.net
>Subject: Re: Crankshaft Bearings
>Date: Wed, 7 Dec 2005 08:42:04 -0500
>
>Steve,
> I am told it can be done---I've never done it. Connecting rod
>bearings are easy to do from underneath the car, but mains seem much more
>difficult.
> If you are having concerns about low oil pressure, replacing the rod
>bearings may improve the pressure. I have done that to two engines, and
>pressure increased from 15-20 hot in one and 45-50 hot in the other to
>70. John Twist says that the mains last about three times the life of
>the rod bearings. If that's true, then when the mains have about 210,000
>miles on them it may be time to remove the engine and do a rebuilding.
> To confirm what Gordie wrote, removal of the MGB engine isn't
>difficult, and if the mains really do need to be replaced, I also would
>want to do the work with good lighting, better visibility and easier
>access.
>Bob
>
>
>On Tue, 6 Dec 2005 21:43:08 -0500 "Steve Clifton" <sclifton@cfl.rr.com>
>writes:
> > Can the all of crankshaft bearings be replaced on a 1972 18V engine
> > while the
> > motor is still in the car?
> >
> > Steve C.
> > 72 MGB
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