Author Topic: Oil Pump Removal  (Read 6337 times)

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Offline Clive

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Oil Pump Removal
« on: 18 Oct 2008 at 05:05 »
Hi Everyone,
Have a problem removing the oil pump from the rear crankcase of a Mk3  the nuts are removed from the bottom of the pump i have tapped the gear on top of the pump shaft using a 1 ft long piece of brass and have also heated the case with the gas and increased the tap's to heavier blows to no avail!!!!!!!!before i break something , please any ideas.
PS the case has been sitting around for a long time no sign of corrosion though,the pump is a mk1 not a dragon fly alloy one.
Regards
Clive

Offline eddie

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Re: Oil Pump Removal
« Reply #1 on: 18 Oct 2008 at 07:09 »
Clive,
         You could try making up a makeshift jack from scraps around the workshop to press the pump out of the case. Take a short length of, say, 12mm studding, a nut and washer, and a suitable length of 16mm dia steel tube. Put the nut and washer on the studding, slide the tube up to the washer. Insert the jack between the oil pump and the top of the crankcase (a soft packer may be needed to prevent damage to the casting), apply a reasonable load and leave it for a while, then keep coming back to it and top up the load - eventually, the pump will budge. The postwar oil pumps were not provided with any easy means of extraction and if gasket cement like 'Osotite' (which sets solid) has been used in the past, the pump may be virtually welded into place. When replacing the pump, make sure all faces are flat and then reassemble with either a non setting gasket compound or better still just a smear of grease on the gaskets - then subsequent dismantling will not be a problem.
                              Regards,
                                       Eddie.

Offline Clive

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Re: Oil Pump Removal
« Reply #2 on: 18 Oct 2008 at 08:06 »
Hi Eddie,
Thanks for that will give it a try , the method you discribe will give a straight push the drift of course is at an angle. Will let you know if i have any luck.
Regards
Clive

Offline Clive

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Re: Oil Pump Removal
« Reply #3 on: 21 Oct 2008 at 07:53 »
[Hi Eddie,
Have jacked the pump out about 1/4 inch and its jammed again, have now acquired a thick steel support to go inside the case as the top case has started to distort will now try the jacking process again and hope the casings doesn't give way more heat and slowly increase the pressure .Will keep you posted on progress.
Regards
Clive

Offline eddie

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Re: Oil Pump Removal
« Reply #4 on: 21 Oct 2008 at 12:59 »
Clive,
        Try pushing the pump back in again, then check to make sure there is no foreign matter in the intake and delivery ports - this would prevent any further movement. Also, check that the filter has not shifted sideways, as this can also cause it to jam. Usually it is only the cork gasket that hangs on and makes removal difficult - once you have the pump on the move, it should come out easily. If this doesnt work, with the pump out by 1/4", you should be able to get behind the flange with a couple of levers, but make sure you apply the load to the root of the flange as it can easily be damaged when levering at the outer edge.

                                Eddie.

Offline Clive

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Re: Oil Pump Removal
« Reply #5 on: 22 Oct 2008 at 08:20 »
[
Hi Eddie,
Pump came out today not without a struggle though a little damage here and there , cases appear reuseable, the pump body has belled a little under the drive gear. i have another pump so will make the best one i can using new spring and rotor blades.
Thanks for all your advice
Regards
Clive