|Posted on Tuesday, July 22, 2003 - 09:04 pm: ||
I was wondering if anybody has come across this problem in the past and has any advice on how to fix.
I have a 3HP ACME I'm currently restoring. It is a single cylinder side valve engine.
The camshaft is cast iron. The cam followers have a large captive ball bearing which rides on the cam shaft lobes.
The ball bearings do not turn when under any reasonable pressure, which has caused quite deep grooves to be worn into both lobes.
It seems that there three possible alternatives to fix this:
1) Have the camshaft lobes built up by spray welding or similar and reground. I can't regrind only as there is not enough iron and the lobes are cast iron.
2) Make up two new lobes. They are pinned onto the shaft.
3) Some sort of epoxy, JB Weld?
Are there any other options that anybody can see?
Obviously when the cam is sorted out I will need to do something about the followers.
I really need to do this correctly as the engine will be going into a boat.
Thanks in advance,
|Posted on Tuesday, July 22, 2003 - 10:03 pm: ||
I think you would do best to have new ones made. JB weld will wear away quickly with the engine heat and friction. If the lobes are only pinned on, a local machine shop can make you new ones and you can attach them yourself. I made a ignition timing camshaft for a Martin 40 outboard on a lathe and then shaped it with a handfile. However, for what you are doing, see a machinist.
|Posted on Tuesday, July 22, 2003 - 10:33 pm: ||
This ad is in GEMagazine ?
|Posted on Friday, July 25, 2003 - 03:41 am: ||
If I can get the lobes off then I will get new ones made. I've driven the pins out but it seems they were also pressed on and not really designed to be taken apart again.
If I can't get them off I will try to get them spray welded and reground.