G9 1953 Noise

Information relating to the Matchless G9 or AJS Model 20 500cc twin
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G9 1953 Noise

Postby aryden » Sat Dec 21, 2019 12:46 pm

I wonder, which clearance is allowed on cam-followers sideways, G9 1953, I can move them 2-3 mm.
I´m asking because there is a noise in the area at the cylinder base or crankcase (timing-case), I suspect cam-followers or that the timing gears are making the noise (rattle).
I also attached a photo on the push rods, I do not know if the damage is fresh or if it is old damage. What might have caused this?
A.Rydén
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Re: G9 1953 Noise

Postby dave16mct » Sat Dec 21, 2019 1:49 pm

Valve clearance is 0.006" (which converts to 0.1524mm). I hope thats correct.
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Re: G9 1953 Noise

Postby ajsph » Sat Dec 21, 2019 2:38 pm

Do you have the small spacer 018680, it is a 4mm long spacer (washer), it fits between the crankcase and the camfollower
Poul

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Re: G9 1953 Noise

Postby aryden » Sat Dec 21, 2019 3:43 pm

Thanks Dave and Poul, Valve clearance ok, but the wascher 018680, I have to check this out. I haven't split the crankcase yet.
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Re: G9 1953 Noise

Postby robcurrie » Sun Dec 22, 2019 7:01 am

I have seen this type of damage to pushrods due to badly made head gaskets, where the holes are not correctly aligned.

Rob C

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Re: G9 1953 Noise

Postby ajsph » Sun Dec 22, 2019 3:10 pm

I have never seen a Head Gasket in the bottom end.
Poul

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