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mjollnir
 Post subject: 1275 CRANKSHAFT
PostPosted: Fri Sep 15, 2017 5:37 pm 
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Joined: Fri Apr 01, 2011 6:05 pm
Posts: 11
Location: Adelaide, South Australia
Is it advisable to attempt to remove a 0.005 inch bend ( indicated on the centre main bearing journal) of an EN40B Cooper S crank? Also needs grinding which will take it to 0.020 undersize. Has passed crack testing.Thank you.
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drmini in aust
 Post subject: Re: 1275 CRANKSHAFT
PostPosted: Fri Sep 15, 2017 8:19 pm 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
I had one of these which bent due to centre main bearing overheating. I was advised to not attempt straightening an EN40B crank but get it ground to the next undersize. It just cleaned up... ;)

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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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9YaTaH
 Post subject: Re: 1275 CRANKSHAFT
PostPosted: Sat Sep 16, 2017 10:37 am 
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Joined: Sun Apr 11, 2004 11:32 am
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Location: Sthrn HiLoLands, NSW, Australia
Yeahbut Doc...if it was bent wouldn't it still wobbulate :?:

I suppose decent bearings and a careful balance would minimise its effect...

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drmini in aust
 Post subject: Re: 1275 CRANKSHAFT
PostPosted: Sat Sep 16, 2017 10:46 am 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
Check balance after grinding. No problemo.

Edit
If it's .005" total indicator reading it will clean up easily at the next undersize. .010" smaller.

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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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