Bsa Mercury stuck piston head
Posted 13 November 2010 - 10:33 AM
Posted 13 November 2010 - 01:37 PM
It sounds like your going to have to be a bit more brutal though. You could try breaking it up with a long screwdriver and hammer. I'm guessing the buffer washer has come out/turned to cheese.
Sounds like the roll pin has failed if it's left the head behind.
Another way would be to braze a wood screw onto a piece of bar and try screwing it into the head so you can pull it out.
Both the above supposes it's a plastic head.
Posted 22 December 2010 - 07:31 PM
Posted 26 February 2011 - 11:46 AM
This is a common problem with the BSA`s fitted with the nylon piston head ,as they are prone to swelling. My usual method of removal is to drift it out by placing a suitable length of steel rod through the transfer port and tap it down the cylinder with a few taps from a hammer. Spray lube down the port first will help to `unstick` it.
When replacing the piston head obtain the aluminium version if possible , this will prevent a recurrence of the problem. Also if you have to use a nylon piston head , discard the wire `piston ring`, if fitted , as this only adds friction and does nothing for the power.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users