how to remove oil pump worm drive nut

Drummer99 · Dec 21, 2013

I am trying to remove the oil pump worm drive nut I have followed all of the procedures in the manuals and I know it is a left hand thread I dont seem to be able to break it free and I am unsure about how much pressure to apply I have read a recent post anyone with some advice for me
Thanks Drummer77

pete.v · Dec 21, 2013

The drive gear on the crank is left hand.

The nut holding the worm gear on the pump itself is right hand.
I have a spare pump in the garage and have confirmed this before I replied.

Drummer99 · Dec 21, 2013

I should have been more specific it is the large nut on the end of the crankshaft holding the worm gear?

pete.v · Dec 21, 2013

Drummer99 said:
I should have been more specific it is the large nut on the end of the crankshaft holding the worm gear?

oK! An electric impact is awesome for this kind of stuff. Otherwise, a sharp wrap on the end of an extension my pop it loose.

Drummer99 · Dec 21, 2013

Thanks that's a great idea what aboutan airpowered impact gun?

Torontonian · Dec 21, 2013

Sure,try that. Some nuts come off or go on using steady pressures. This baby has no washer ,so shock value is the way to go. How have you supported the rod ends or pistons to take the forces ? I always use wood.

Drummer99 · Dec 22, 2013

I have followed the process in the Clymer manual I have a steel rod thru the wrist pin holes on the rods resting on wood I have an 18 inch Johnson bar on the nut and applied steady pressure as described in the manual. However I am concerned about deforming or over stressing the rods. Can I hit the bar with a hammer or could I use a longer bar What about the stress on the rods?
Thx

Matt Spencer · Dec 22, 2013

Bloody Clymer !

Wouldve been better to kick it free with the head still on .

I wouldnt stuff your rods , but would be safer under compression ( of rod - stretching them would likely distort the small end )
A sort sharp shock with a tool that fits exactly . Primary still on ? Top Gear and lock the rear brake maybe . Dont Panic .
Youre right to be wary .

Drummer99 · Dec 22, 2013

I have the motor pretty well dismantled on the bench I'm down to taking the timing chain off and splitting the cases what if I put a steel rod in one of the holes in the crank and jam it up against a piece of wood against the cases? I have 3 different manuals and Clymer is the only one that describes a process at all?

Matt Spencer · Dec 22, 2013

Pretty sure with the superblends you can pull the cases with the tripe on the crank there .

Big bench vice or confabulation and you can grip the cheek , provideing you dont drop it .

mike996 · Dec 22, 2013

I have found an air-impact wrench (an impact "driver" type wrench, not an air ratchet) is one of the best tools around for working on a Commando. You can loosen just about anything with very little issue and no need for exotic tools/procedures. for example, it probably cuts the time in half to remove a chain case. There is no need, to do anything to remove the rotor nut other than put the socket on the nut and pull the trigger. Same with the clutch retaining nut.

NOTE - use the wrench for LOOSENING ONLY! Tighten with torque wrench/whatever you normally use though you can run the fasteners in with the impact wrench set at it's minimum "power" if you want.

Drummer99 · Dec 22, 2013

Thanks I will give the air a try tomorrow right now we have a huge ice storm up here in Toronto Thanks for the info Merry Christmas Ill let you know if I break it with the air

Torontonian · Dec 22, 2013

Crazy is still stuck out in the snowbank covered well but now sealed in the icestorm frozen rain. Trees shattered all about.

how to remove oil pump worm drive nut

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