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atlas alternator position ?

Submitted by andy_johnson on Sat, 25/01/2020
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Heavy Twins

hi , i have an atlas motor fitted to an ajs , coming round to refitting the chain case (after an engine rebuild ) the position of the alternator in relation to the rotor is puzzling me , it only sits halfway into the alternator ? i found this when i stripped the motor for a rebuild so it must have been working before i touched it  ? or not ? anyone else had experience of this ? if i space the rotor out on the crankshaft there's only about 5 threads to hold the nut on , this dosent seem right , so my other thought was to make longer primary chain case  studs and space the alternator inwards to suit the rotor position ? the photo is how i found it when i stripped the motor for the rebuild 

all thoughts and comments on this gratefully received 

andy 

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Submitted by robert_tuck on Sat, 25/01/2020

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Could be an incorrect sprocket, there would appear to be face wear on the sprocket indicating misalignment with the clutch?.

Submitted by peter_weait on Sat, 25/01/2020

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Hi Andy I think you have the spacer in front of the rotor when it should be between the sprocket & the rotor.

Submitted by andy_johnson on Sun, 26/01/2020

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Hi pete ,I tried the spacer between the sprocket and rotor , but this left only a few threads on which to screw the nut , didn’t seem right ? 

Ill fit the clutch robert and see what it all lines up like .

regards andy

Submitted by peter_weait on Sun, 26/01/2020

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HI Andy  Have you got the right crank shaft nut ? it should have a reduced plain shoulder which goes inside the rotor which should give you enough threads. Peter 

 


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