norton commando 850cc

kelleya1977 · Oct 28, 2012

i have a norton commando 850. is it possible anyone knows the permissable end float in the cam shaft. at present i have one steel concaved washer and one bronze thrust washer inside the crank cases on right hand side.i have approx 3-4mm. is it possible that this float would be taken up when cam chain is fitted on sprockets under momentum

acotrel · Oct 28, 2012

It is important that the cam lobes don't operate two lifters at once. Otherwise I can't see a problem with excessive end float, except that t he chain line might cause the sides of the sprocket to wear as it tries to self- align.

pete.v · Oct 28, 2012

I believe 3 to 4mm or more is common.
It has always been a given the the tach gearing keeps it to the right. I suppose this is true but it does beg a question.
What if you run an electronic tach and the guts are pulled and you have the boss blanked off?

kelleya1977 · Oct 28, 2012

i thought this was the case.

do you know the permissable end float on the crank shaft and if what ive got which is about 1mm, should i shim this clearance up on the insiude of both main bearing inner racies

pete.v · Oct 28, 2012

kelleya1977 said:
i thought this was the case.

do you know the permissable end float on the crank shaft and if what ive got which is about 1mm, should i shim this clearance up on the insiude of both main bearing inner racies

.1270mm - .3810mm or .005" - .015" as stated in the workshop manual. You do have one of these, don't you?

Although you haven't mentioned the type,

the Mk3 is .010" to .024" or .254mm to .610mm.

marinatlas · Oct 28, 2012

Hi ,what kind of camshaft bushes do you have , as it seems strange to have a bronze washer inside (say between the steel champhered one and the bush.....° AFAIK.....!

kelleya1977 · Nov 2, 2012

thanks for your replies everyone

norton commando 850cc

kelleya1977

acotrel

pete.v

kelleya1977

pete.v

marinatlas

kelleya1977

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