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MQ There have been posts about removing the oil pan without removing the engine.  Removing the engine to in front of the galley/salon is not that difficult with a chain hoist.  Then you can remove the oil pan.

How you fix the leaks is another matter.  Never heard of it being done, but welding a plate to the inside might be an option or maybe trying to cover the inside area with epoxy might work??  Don't know if the metal and epoxy have incompatible heat expansion rates??

A few thoughts

MQ : If you still have the black wire reinforced STIFF hose between the exhaust rise and the inlet to the muffler - CHANGE it - to the blue softer Hump hose.  You'll extend the life of the fiberglass muffler inlet and keep it from leaking!!

Also check to see if the hose from the vented loop to the small nipple on the riser is still the stiff wire reinforced hose - CHANGE it - to a softer nylon hose.  That stiff hose transmits all the engine vibs to that weld in the nipple which eventually breaks & leaks !!

A few thoughts

Might be a job worth a wait. The inside will not rust, soaked in oil. I think it may be a job that leads to other issues, such as engine alignment.

Sorry just read your other thread, seems to be toast.

Try Kubota dealer or Westerbeke. I believe someone did remove the oil pan without raising the engine.  Required skinny arms.  Getting it back in with the gasket aligned is another matter.

Replace the zincs in the heat exchanger as required.  Inspect all components as required.

I also replaced the exhaust riser when the flange connection to exhaust manifold was rusting out.  Didn't want the riser to blow in some remote location.

Gents,

Is ther any routine maintance required for the wet exhaust system? Some of my clamps rusted away and I had a leak, which i fixed. That got me thinking.

Do you need to clean that system out every once in a while, or anything?

V/R,

MQ

1987 Catalina 34
M25XP

Gents,

Oil pan is looking rough, has been for years. Where is a good sorce for a new one? I don't see them on Catalina Direct.

Also, can you replace with engine mounted? or, dop you need to pull it?

V/R,

MQ

1987 Catalina 34
M25XP

Thanks for the advise. I'll buy a new one, install, and get the boat into fighting shap. Than re-build the old one as a back-up.

I'll need a new oil pan also, that has been toast for years and worse now. I'll open a new thread for that.

V/R,

MQ

It’s not uncommon for the shaft to become frozen. I believe Maxwell recommends inspecting twice a year.
I removed mine last year, greased the shaft and replaced the gear oil and seals.  Not too tough a job.
Meanwhile my dock neighbor was using a dremel and various saws to remove his after ignoring it.

Guys : For those that are first time readers on "How To rebuild an Oberdoffer Pump"  I want to give a few kudos to Stu Jackson. 

One of the most important steps in that rebuild is NOT to score the inside wall of the pump while removing the old lip seals!!.  That's why I built my special tool. 

Stu later pointed out that a 20p nail could be used - instead of going thru the work of making my special tool!!  And he was right!!  I over-engineered to fix a problem that could be simply solved   
 
 CONGRATULATIONS STU !!!   

A thought