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Engine Sprocket Removal

Submitted by leslie,peter_howard on Mon, 13/09/2010
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Heavy Twins

Over the 40+ years Iâve been pulling engines apart I have amassed quite a few pullers.

However, Iâve been trying for over an hour to get my engine sprocket off my Model 7

This is resisting my strongest pullers and every trick I know.

I have hit the centre bolt with a large hammer. Iâve heated the sprocket with a blow lamp and got to the point that I cannot turn the centre bolts any tighter before the legs jump of the sprocket so at the moment, even though I've tried clamping the legs so they cannot splay out, so Iâm a beaten man.

Does anyone know of a puller that is near guaranteed to get the sprocket off please?

I suppose Iâm going to have to pay around £70 quid to get a hydraulic one but even then I fear it will slip off the teeth of the sprocket due to their curved under surface.

If anyone can guide me to a known puller that is known to cope, and perhaps a web link to it,I will be most grateful

Many thanks

Les H

Submitted by leslie,peter_howard on Tue, 14/09/2010

Permalink

Not at all Michael. I'm extremely pleased to have done so.

But it was a massive relief to me.Well first I had to lie down and take a quick nap first; I was mentally drainedand needed a rest.After the break, and revisiting the problem, I went through all of my pullers andselected one that had the strength and another with the right legs.I took them apart and reassembled to make one that I could secure the legsrigidly with large nuts onto the puller barwhich had a very largecentre bolt but with a very fine thread to achieve high pushing power. I alsomade sure the thread was very well oiled to cut down on friction and furtherincrease its pushing power.I then used a 3 foot sash clamp to compress the 2 heavy square section pullerarms together so it was impossible for the legs to open and move away from thesprocket teeth. The clamp had to be done very tightly as to resist all movementof the legs.Then with a long 1/2 drive ratchet, I wound on the tension and at the same timeI could hold the end of the sash clamp to stop the whole thing turning as thetorque was continued.I kept winding on the pressure to a point that I thought the whole set up wouldexplode, removed the drive, hit the centre bolt end smartly with a steel hammerand bang....off flew the sprocket.A case of; if at first you don't succeed keep on trying with each attempt more complex than the previous ones.

Taking a break also helps.

You' ll get there in the end.

Les H

 


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