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Thrust washer "what if?"

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Mail From: "Jim Muller" <(email redacted)>

What if a thrust washer falls out (or wears away) would be the
result? Would it create strange engine noises? I'm musing over
possibilities...

--
Jim Muller
(email redacted)
'80 Spitfire, '70 GT6+
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Mail From: Cleobury Phil <(email redacted)>

Mine did this a few months ago :(
For me.....
No other signs other than...
a)Clutch wouldn't/didn't release (couldn't understand why it wouldn't go
in gear anymore) ... there was to much movement forward from the main
crank in the block when the clutch thrust bearing tries to push the
clutch cover plate to release the clutch plate.
b)Metal filings in the engine oil and with a magnetic sump plug the one
of the thrust bearings came out on the end of the magnet when I took the
plug out!
To check
1) Check end play on crank drive pulley ie doesn't have excessive play
and is in tolerance.
2) Drop the sump and take off rear end cap, check thrust washers are in
place - recheck tolerances and replace with new ones to compensate for
mileage.
To Repair
1) Replace thrust washers with new ones correct new ones in tolerances
(to compensate for mileage). Parts $10
2) Obtain replacement engine New or Refurbished $600 - $5000 +
3) Repairable block/crank - Brake down engine and re machine replace
necessary parts $1000 +
4) Repair engine with replacement machined block and crank plus parts as
necessary $2000 +
Notes:
Make sure the thrust washers are in the right way round!
The grinding of gray cast iron block on a //Tuftrided high carbon steel
crank - is a very quiet sound... but an expensive one!

On 8/27/2010 11:37 AM, Jim Muller wrote:
> What if a thrust washer falls out (or wears away) would be the
> result? Would it create strange engine noises? I'm musing over
> possibilities...
>

--
Regards
Cleobury P
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Mail From: Greg Rowe <(email redacted)>

When I had this happen some years ago, there was a loud
squealing noise with the clutch disengaged which sounded
exactly like a bad throw-out bearing - which is what I originally
thought was wrong. But the damage was pretty advanced
at that point.

Greg Rowe

> From: (email redacted)
> To: (email redacted); (email redacted)
> Date: Fri, 27 Aug 2010 11:37:46 -0400
> Subject: [Spits] Thrust washer "what if?"
>
> What if a thrust washer falls out (or wears away) would be the
> result? Would it create strange engine noises? I'm musing over
> possibilities...
>
> --
> Jim Muller
> (email redacted)
> '80 Spitfire, '70 GT6+
> _______________________________________________
_______________________________________________

(email redacted)
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Mail From: Mark J Bradakis <(email redacted)>

By the time you hear noises the crank has already
machined its way into the block, crudely, I might add.
Well, one noise that you will hear is the grinding
of gears when shifting, as the clutch pushes the crank
into the space where the thrust washer used to be,
rather than compressing the diaphragm spring enough
to disengage.

A common problem on Spits, GT6s, TR250 and 5s, as
well as MG Midgets with the Spitfire 1500 in them.

One fix is to machine the main cap to hold an additional
thrust washer so there is a full 360 degrees of coverage
on the rear side. That's the side that takes the lion's
share of the wear due to clutch usage. Then the thrust
washers are pinned into position. Of course, the fix has
to be done BEFORE the block and crank are destroyed.

mjb.
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