Hi,
I have noticed how the older machines all have a much sweeter bearing to pocket fit.
I’m working on an engine from the 50’s and you literally need no more than 100c and the bearing will fall out.
In the 60-70’s the chainsaws seem to be around 130c, still fine, nice snug fit but temperatures that won’t damage anything.
From the 80’s onwards the pockets are so bloody tight and need temperatures of 185c or more to get them in. It’s a pain in the arse and so unnecessary. If you don’t use heat you can end up cracking the pocket, gouging the pocket or poor alignment. If you use heat you can overheat the races and balls, in fact everything and chances are you’ll get the bearing stuck half way and have to pound it out. Why?
.
I have noticed how the older machines all have a much sweeter bearing to pocket fit.
I’m working on an engine from the 50’s and you literally need no more than 100c and the bearing will fall out.
In the 60-70’s the chainsaws seem to be around 130c, still fine, nice snug fit but temperatures that won’t damage anything.
From the 80’s onwards the pockets are so bloody tight and need temperatures of 185c or more to get them in. It’s a pain in the arse and so unnecessary. If you don’t use heat you can end up cracking the pocket, gouging the pocket or poor alignment. If you use heat you can overheat the races and balls, in fact everything and chances are you’ll get the bearing stuck half way and have to pound it out. Why?
.