Pressure washer head stuck on GX390 crank

[rkcarguy]

I acquired a GX390 pressure washer that has some issues and the engine is locked up. It has a CAT 66DX pressure washer pump on it that seems to be in good shape but it's also stuck on the crankshaft and I don't want to ruin anything. The bolts that secure the pump to it's bell-housing are of course inside the housing so no access.

The only thing I can think of is to drill a hole in the bell-housing and then apply some heat with a propane torch to see if I can wiggle things loose, or remove that 4 bolt cover plate and maybe bolt on a plate there with a threaded rod welded into it and try to slide hammer it off of there?

Attached the exploded view of the pump so you can see what I'm dealing with.

[John Hasler]

Are you trying to salvage both the pump and the engine, or just the pump?

[rkcarguy]

I'm trying to salvage both if possible. Oil doesn't smell or look bad so I'm thinking the engine may be stuck at the rings from sitting for years.
I just sprayed a bunch of PB blaster into the spark plug hole and I'm going to let it soak until tomorrow and see if I can't crack it loose.
The last one I worked on had a dead pump but good engine, so I sawed through the bell housing with a Port-a-band and then used the torch to heat up the coupler until it slid off the crank.

[John Hasler]

If both valves are closed try compressed air. It will both apply force to the piston and drive whatever lubricant you put in the cylinder down into the rust.

[rkcarguy]

The PB blaster broke it loose, it wasn't stuck all that bad. The starter rope was also frayed and was catching inside the starter recoil and then broke, so I rewound it with some west marine sailing cord (1,200# rated and nice and soft, about same size)....and it runs! I didn't run it long because I don't want to damage the pump just a few seconds.
I just need to get it to separate from that pressure washer pump, I'd like to use the engine to repower my Struck mini dozer.

[John Hasler]

Do you have a use for the pump?

[rkcarguy]

I do not, thought if I could save it though that it could be "offerup'd" as I looked up the pump number online and Northern Tool sells it for $599 new.