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MG Midget and Sprite Technical - Crankshaft endfloat

948cc engine.
For a while the engine revs have dipped a bit when the clutch pedal is depressed - typical of excessive crank endfloat.
I have just dropped the sump and measured the endfloat with a DTI, moving the crank with a lever. I measure 0.006", probably 0.007" if push the lever hard.
Is this excessive and will it cause the rev dropping.
I have 2 Haynes manuals, a very old one which states 0.003"-0.007" and a newer one which says 0.002"- 0.003"
I recall That I have read here in the past that it should be 0.003" but is 0.006" ok albeit potentialy at the top limit?

Thanks

Les
Les Robinson

Hi Les

I tend to go 3-4 thou for endfloat. Putting new thrusts in will tell you if it helps the idle speed droppping.

See you soon.

Peter

P Burgess

Les,

I rebuilt my 948 (well, 998 now) with 2-3 thou endfloat on the recommendation of a well-respected local engineering shop. Two years and a thousand miles on I've had no problems.

Your present 6-7 thou is definitely too much.

dennis
D Stanfield

Just removed the thrust washers and measured them, exactly 0.092" which is correct for standard washer according to Moss catalogue.
There is a + 0.005" available, but is this total or on each side taking me +0.010" in total?
If it is +0.005" total then might possibly get away with it - or is it a bit tight?

Incidently, the +0.005" are quite a bit cheaper than the standard which I find odd.

Les
Les Robinson

Hi Les

Less requirement for standard so more expensive?

Your best bet is to surface grind a couple of thou off one 005 thrust washer. I would tend to fit the machined 005 to the clutch end, may absorb the movement with less friction?

Peter
P Burgess

Les,
Why not just replace one shin and leave the other as it is?

Guy
Guy

This thread was discussed between 13/03/2011 and 14/03/2011

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