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 Post subject: camshaft end float
PostPosted: Thu Nov 18, 2010 10:13 am 
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1098cc
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Joined: Mon Nov 06, 2006 8:54 pm
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Location: Hunter NSW
Just put a camshaft,new oil pump and new duplex timing sprockets how much end float should there be on it with, new sprocket on it I get 16 thou old one I get 6 thou I presume I will need to set new one up in my lathe and machine it down but is 6 thou right or should it be less makes it difficult for lining up sprockets


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PostPosted: Thu Nov 18, 2010 11:29 am 
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There is no presibed end float on the camshaft.

The lobes are ground (or should be!) such they they are not parallel to the shaft centre line but slightly tapered - all the same way - so the Cam actually thrusts in to the cam thrust plate (funny 'bout that!) as it rotates.

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PostPosted: Thu Nov 18, 2010 4:15 pm 
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Did you replace the triangular thrust plate? They do wear, the coating is whitemetal.
Maybe it is a bit worn and someone machined the old sprocket to compensate.
Karcraft and Minis Plus both stock the plate.

I aim for about .005" end float when assembled on the cam.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Thu Nov 18, 2010 4:28 pm 
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1098cc
1098cc

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Location: Hunter NSW
Replaced that to I even put a very good old one on it comes up with the same amount of end play might just skim it on the lathe


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PostPosted: Thu Nov 18, 2010 4:40 pm 
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Remember these `new' duplex timing sprockets are all aftermarket and made God knows where now. Probably made off a sample.
They would not be privy to a BMC/Leyland/Rover component drawing. :wink:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Thu Nov 18, 2010 7:28 pm 
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1098cc
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Joined: Mon Nov 06, 2006 8:54 pm
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Location: Hunter NSW
Thats what I thought will skim it tomorrow thanks for you help guys


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