onanparts.com
New User
I've been rebuilding Onan CCK, B & P series engines for just over 20 years and have seen a few intake seats come loose on the P series .
Early P series blocks did not have a good peened over area to lock the intake seat in place. On the later blocks Onan corrected that problem. They only offer a +.010" oversize seat but by the time you figure out what's going on the seat bore is to sloppy for the .010" oversize seat to be any good.
Most if not all shops or dealers will tell you the block is junk and needs to be replaced. Not true! Several options are available. I have +.100" & +.162" oversize seats that any good automotive machine shop can install in your block.
The original seats are .355" thick and mine are .437" thick. If the seat bore has not been hammered down too far then the block can be machined to fit one of these oversize seats.
If your block is too far gone it can in most cases be welded or built back up and then machined for a STD size seat.
Early P series blocks did not have a good peened over area to lock the intake seat in place. On the later blocks Onan corrected that problem. They only offer a +.010" oversize seat but by the time you figure out what's going on the seat bore is to sloppy for the .010" oversize seat to be any good.
Most if not all shops or dealers will tell you the block is junk and needs to be replaced. Not true! Several options are available. I have +.100" & +.162" oversize seats that any good automotive machine shop can install in your block.
The original seats are .355" thick and mine are .437" thick. If the seat bore has not been hammered down too far then the block can be machined to fit one of these oversize seats.
If your block is too far gone it can in most cases be welded or built back up and then machined for a STD size seat.
