Re: Enclosed picture of norton tool not sure what its for?

Crankshaft pinion extractor ET2003

As David correctly states this item is a Crankshaft Pinion extractor. It can be used to pull the pinion gear off the crankshaft of most Norton twins. Certainly the bigger engines. Generally it is one of those tools that is rarely needed unless you are going to split the crankcases.

On most of the Norton twins, to get at theCrankshaft Pinionyou will first have to remove the oil pump and its worm drive which sits on the crankshaft end. This has a LEFT-HAND thread. The only one on the whole engine!!! The gearbox drive shaft has a LHthread as well.

To use the puller involves winding back the sleeve until the three legs are well exposed and also the centre bolt which acts as the extractor. The next bit istricky as you use one hand to wrap the three legs around the back of the pinion while turning the sleeve to squeeze these legs together. You must make certain that the small angled feet are absolutely in the right place behind the pinion otherwise they may break off. You can generally see where they need to be positioned as behind the pinion is a 3 sided washer and the feet go into the spaces.

As a rule, all that is needed now is the extractor bolt to be turned while the crankshaft is held still. The pinion will slowly be eased off the crankshaft. HOWEVER!!! I have often found on high mileage engines that the pinion is gummed fast in place by oil residues and needs a good warming with a gas torch before using the extractor.

Previously wrote:

As David correctly states this item is a Crankshaft Pinion extractor. It can be used to pull the pinion gear off the crankshaft of most Norton twins. Certainly the bigger engines. Generally it is one of those tools that is rarely needed unless you are going to split the crankcases.

On most of the Norton twins, to get at theCrankshaft Pinionyou will first have to remove the oil pump and its worm drive which sits on the crankshaft end. This has a LEFT-HAND thread. The only one on the whole engine!!! The gearbox drive shaft has a LHthread as well.

To use the puller involves winding back the sleeve until the three legs are well exposed and also the centre bolt which acts as the extractor. The next bit istricky as you use one hand to wrap the three legs around the back of the pinion while turning the sleeve to squeeze these legs together. You must make certain that the small angled feet are absolutely in the right place behind the pinion otherwise they may break off. You can generally see where they need to be positioned as behind the pinion is a 3 sided washer and the feet go into the spaces.

As a rule, all that is needed now is the extractor bolt to be turned while the crankshaft is held still. The pinion will slowly be eased off the crankshaft. HOWEVER!!! I have often found on high mileage engines that the pinion is gummed fast in place by oil residues and needs a good warming with a gas torch before using the extractor.

I don't know what i did wrong with my extractor, but it successfully removed the pinion then when I attempted to release the pinion from the tool, the rimg that you screw down to clamp the legs refused to budge. Result, the pinion is still clamped firmly into the tool which remains locked up. Luckily I had a couple of spare pinions available! Beware.

Previously wrote:

I don't know what i did wrong with my extractor, but it successfully removed the pinion then when I attempted to release the pinion from the tool, the rimg that you screw down to clamp the legs refused to budge. Result, the pinion is still clamped firmly into the tool which remains locked up. Luckily I had a couple of spare pinions available! Beware.

The screw down collar relies on friction to hold the three plates in position, simply spray some wd40 or whatever light lubricating oil you can into the tool, let it set for an hour or so and then hold the collar with your hand and release the friction lock by backing out the bolt. If you cannot grasp it tightly enough put it in a vise and proceed. Craig