USHM3 timing chain deflection

for those with Series MM sidevalve cars produced between September 1948 and February 1953
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Mick Lynch
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Posts: 219
Joined: Sat Sep 12, 2020 9:20 pm
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USHM3 timing chain deflection

Post by Mick Lynch »

Can any one tell me the approx deflection of the USHM3 timing chain.

It seems to be excessive to my untrained eye - see photos
At rest
At rest
8E7F232E-D2C0-4CA6-8C69-A25780EC2A95.jpeg (1.49 MiB) Viewed 1989 times
At rest
Deflected
Deflected
821ED588-C18E-4E16-8D98-9FC9F1023E89.jpeg (1.68 MiB) Viewed 1989 times
And deflected.
philthehill
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Location: Hampshire
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Re: USHM3 timing chain deflection

Post by philthehill »

The deflection indicates serious wear to the chain and sprockets as can be observed with the wear on the crank and camshaft sprocket teeth.
The chain, crankshaft sprocket and the camshaft sprocket should be replaced.

Mick Lynch
Minor Fan
Posts: 219
Joined: Sat Sep 12, 2020 9:20 pm
MMOC Member: No

Re: USHM3 timing chain deflection

Post by Mick Lynch »

Aye, thought as much. Thanks Phil.
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