P220G and B43M repair info

[ZXT 2,401]

The D160 I bought recently came with a P220G installed that has thrown a rod. It also came with the original B43M, that was supposedly running when pulled. 

 

I dug into the B43M first since it was off of the tractor. I pulled the heads to clean some light rust out of the cylinders that had accumulated. When I went to roll it over, I noticed that the valvetrain was still. I pulled the front cover off to find that it has sheared a couple of teeth off of the camshaft gear. Crank gear is chewed up slightly so it'll get replaced too. I've read of a few that have had similar issues due to a bad cam bearing, but those examples have had all of the teeth on both the cam and crank gear chewed up badly, whereas mine simple sheared some off. The cam turns easily and I feel no binding. Is it possible that it fired against a stuck valve and that's what gave? The governor ball retainer is also split at one spot. I'm not sure if this is factory or not but I doubt it. 

 

I've seen a couple of compatibility lists out there and it seems that B43G's as well as B48M's use the same crank gear and cam. I can't find anything listed stating if the P220G crank gear and cam (Maybe the gear comes off the cam? I forgot to look before I put it back together) will fit the B43M. If the gears will interchange, I'd like to test how it runs with those in case it knocks or smokes bad. 

The P220 will get pulled apart fairly soon. Anyone with any knowledge of Onans, I'd love to hear what you have to say!

[lynnmor 7,813]

The split ball spacer left the engine run ungoverned and the extreme speed probably is what wasted the engine.  Look at all bearings for evidence of high speed failure.

[ZXT 2,401]

1 hour ago, lynnmor said:

The split ball spacer left the engine run ungoverned and the extreme speed probably is what wasted the engine.  Look at all bearings for evidence of high speed failure.

Interesting! I'm not educated on the governors in these, so I'm trying to see how that being split would make the governor not work. All of the ball bearings were still in place and contained, unless there's something missing that should be there. I'll have to pull the pan off to check the rods, but rocking it over there doesn't appear to be any play on either rod. I don't think the engine is wasted, but I could be wrong. 

 

Thanks!

[lynnmor 7,813]

10 hours ago, ZXT said:

Interesting! I'm not educated on the governors in these, so I'm trying to see how that being split would make the governor not work. All of the ball bearings were still in place and contained, unless there's something missing that should be there. I'll have to pull the pan off to check the rods, but rocking it over there doesn't appear to be any play on either rod. I don't think the engine is wasted, but I could be wrong. 

 

Thanks!

The spacer drives the balls, any slippage will have the balls spinning at a lower RPM.  For example; is the spacer is slipping by half, then the throttle will try to make the engine run at 7200 RPM instead of the 3600 you expected at full speed.