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BeezaBryan
BeezaBryan
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Fitting Oil Pump Makes Crank Stiff to Turn By Hand
#816867 07/20/20 11:14 pm
Joined: Nov 2008
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Just putting together the timing side of my A65 1971 model. The bottom end has just been rebuilt into NOS cases, the crank rotates nice and free until the oil pump locating nuts are tightened, the oil pump drive gear and the oil pump pinion are binding, back the nuts off half a turn and it's free again. The oil pump and and gear are from the old motor only the crankcases have changed, the oil pump studs must be closer to the main bearing by a thou. or two. The only way I can think of fixing this is to file some material from upper sides of the mounting holes in the oil pump to allow it to sit a bit lower, further away from the crank, I'm just wondering if anyone has a better idea before I hack into the pump with a chainsaw file ??

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Re: Fitting Oil Pump Makes Crank Stiff to Turn By Hand
Beeza Benz #816868 07/20/20 11:37 pm
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Are you still using the studs?
The best way is to use 3 allen bolts, this allows you to fit and remove the pump only.
If the bottom end has been line bored a few thou lower the the gears will bind but
by opening the holes a fraction will cure this, no problem.

Last edited by NickL; 07/20/20 11:43 pm.
Re: Fitting Oil Pump Makes Crank Stiff to Turn By Hand
NickL #816870 07/20/20 11:39 pm
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Yes still using the studs,

Re: Fitting Oil Pump Makes Crank Stiff to Turn By Hand
Beeza Benz #816871 07/20/20 11:44 pm
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Use the longest 1/4 unc bolts that will go in.
Check the pump gear is not touching the steel spacing washer under the crank worm.

Last edited by NickL; 07/20/20 11:46 pm.
Re: Fitting Oil Pump Makes Crank Stiff to Turn By Hand
NickL #816873 07/20/20 11:56 pm
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Cheers

Re: Fitting Oil Pump Makes Crank Stiff to Turn By Hand
Beeza Benz #817179 07/23/20 5:06 pm
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Was the oil pump reconditioned?

Check to make sure that the pump is not distorting when installed in place

Remove crank, install pump onto the case

Tighten it up and see if it spins free

If not, address the clearance issues internally


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Re: Fitting Oil Pump Makes Crank Stiff to Turn By Hand
Beeza Benz #817199 07/23/20 7:17 pm
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With the crank worm gear off fit a rubber hose onto the pump spindle. Attach an electric drill to hose. Have a feed supply of oil rigged up to the engine feed pipe. Since it's a 71 you can rig up a pressure gauge to the sender light port. If not remove the oprv. Spin the pump with the drill. Either check the gauge or if the oprv is removed check for flow.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
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Everything will be alright in the end. If its not alright, its not the end.

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