Removing timing side bearing from crankcase (Dommie 88)

The bearing is usually a tight sliding-fit on the crankshaft and the crankshaft usually comes out with a good thump with a substantial metal hammer against a soft metal (say aluminium) dolly between the shaft.  The bearing usually needs about 250 deg in an oven and it usually drops out under its own weight.  However if an adhesive has been employed it mat need a thump against a large socket.  Good luck, Howard

You do not want to be thumping a steel bearing out of an alloy case and wallowing out the housing and losing the interference fit. Put the lot in an oven for 30 mins at 230C and then with oven gloves set it on your stand and the weight on the crank should pull it out.

John - The inner of the bearing is not an interference fit on the crankshaft. However the outer of the bearing is an interference fit into the crankcase.  If the bearing inner is a very tight fit on the shaft and both elements are steel why should heat  release one from the other.  You are more than likely going to end up with the bearing stuck on the crankshaft and the crankcase free of both.  Then you still have to release the bearing with a special puller or a grinding tool.  i thought wallowing is what hippos do in mud.................  I have done hundreds without any evidence of wallowing.  Good luck, Aston and mind the hippos !    

If the outer had been spinning in the case, it might well be glued in with Loctite Bearing Fit (or similar). Heat softens it.

Hi Aston , one simple thought having looked at your set up in photo2 . I think a lot of force is being dissipated by the wood in the support flexing and taking the woomph out of the thump . Maybe needs to be metal with some thin cardboard protecting the faces . Hope this simple idea is helpful, Best of luck 

C not F and the bearing is made from steel so no effect and any alloy heat treatment in the case is also not affected. Blowtorch will not give the confidence the whole casing is up to temp, if you just heat around the bearing then the warm alloy just moves inwards as its surrounded by cold alloy.

Oil will be burnt so plenty of ventilation, give SWMBO the credit card and tell her to go shopping for 3 or 4 hours. The smell of burnt oil should be mostly gone after that time, a burnt piece of toast will cover the rest.

Infrared hand held thermometers are good and cheap. And handy in the home anyway.

The 'thump' is by dropping the crank case flat onto a flat surface. Not hitting anything with a hammer.

The books say "do not drill the case flange and drift it out from behind". But perhaps needs must? Has it been staked or glued in place to prevent spinning?