Harlan.........
I'm not sure how missing thrust washers, which limit the fore-and-aft
movement of the crankshaft, would enable the fan to move forward a
noticeable amount. This would happen an a Triumph TR3 or 4, where the fan
fits to the nose of the crankshaft, but on all the MG engines I've worked on
the fan is attached to the water pump (exc. '77 and later 18Vs, for those of
you who share my need to pick nits). There's no way missing crank thrust
washers will allow the water pump to move. And, just for the record, I've
overhauled hundreds of MG engines and have never once seen a case where the
thrust washers had fallen out.
Lawrie
British Sportscar Center
-----Original Message-----
From: Harlan Jillson <hjillson@argohouston.com>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: Thursday, January 07, 1999 6:05 AM
Subject: Re: Free play in crank?? ('70 MGB)
>This is a good one.
> Scott votes for spun bearing, and Eric is betting on worn thrust
washers....
> If I understand correctly, the problem with the movement is that the fan
rotates up to 3/8 of an inch, not that it moves forward and back, which is
what it would do if it were thrust washers. ( easily checked, step on the
clutch with the engine idleing in neutral, and have someone watch the fan,
it will visably move towards the radiator if the thrust washers are
completely shot... done that one.)
> If it were a spun bearing I'd expect to see a fairly drastic drop in oil
pressure (been here to), which would probably get my attention a lot faster
that a 'clicking noise' that comes and goes.
> It sounds to me that the play in the rotation of the fan and water pump,
aka everything tied to the drive belt, is more that likely caused by the
harmonic balancer becoming detached from the hub. Probably if you check
use a mirror to watch the hub/crankshaft end while someone wiggles the fan
back and forth ) you will find that the balancer/pully is rotating with
respect to the hub/crankshaft, meaning someone isn't firmly attached to the
rubber bit in the middle anymore.
> My $0.02. (Probably worth about as much as anyones, and not one bit
more.... )
>Harlan.
>
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