Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi, and thanks for the previous information Ade.

I got the M91 down of the shelf yesterday, and stripped it down again. I was most concerned about the crank having lots of endfloat and binding up with the new bush's instead of the needle rollers. I centralised the crank webs in the crankcase and then moved both bush's in towards the crank web leaving a few thou each side for end float. I then used locktight between the bush outer surface and the top and bottom crankcase.
this gave the right sort of end-float to the crank although the crank was still tight to turn so I left the bolts a bit loose.
Next I double checked my ignition and exhaust timing and away the engine went . It runs pretty quite now without the clatter of the old bearings. After about 30 minutes running I was able to tighten up the crankcase halves and the crank is nice and free. So pretty happy with how she runs for now.