Maineah

Good plan part of a normal tune up but it is not an engine with shimmed valves.

Yes and the early ones were known to gum up with oil sludge. More than likely poor maintenance. With the mileage the OP has I believe it was well taken care of. if it were mine I would do a quick compression check and go from there if a valve has too little clearance it will show up with lower compression.

Shims are available but it's not a job for the faint of heart and you will need the tool to press the shim bucket down and a micrometer air gun helps too the blow the shim out of the bucket and last but not least a pencil to write the shim size down on the cylinder hear. It is a time consumer so be prepared for sticker shock. You could pull the cam covers and check them but that is not a lot of fun either. Here is the theory behind shimmed valves the ideal is every thing wares at the same rate so the adjustment "should" outlast the engine. If you are in doubt you could do a compression check if you have a cylinder with noticeable difference it could be a tight valve other wise I would leave it alone. They still use the same ideal today My 2011 Tacoma 4L is basically the same setup just twice the number of valves. I have seen those engines with well over 250K that have never been touched. The variants were made up until 1996.

Yep.

Look and see of the center is still bolted the fan clutch. I agree with WRE the crank seal can leak a lot of oil! and from the looks it has been for awhile it's not uncommon on the 22re's because the engine oil pump is right behind the seal. If I remember correctly the fan had lock tabs on the bolts so it's unlikely it just fell off. I'm going to say you are lucky it didn't take out the radiator. By the way a mile drive or so from dead cold is about it with no fan.

Common issue but it needs to be confirmed before going over board if there is CO in the radiator it's leaking, a compression test is in order regardless. Depending on mileage it could need a chain and guides the head will have to planed if the gasket is leaking any way, there is a reason for the leak. Now why is the head gasket leaking? Yeah over heat but it seem the OP has been watching the temp (good practice) it maybe flat age and aluminum. For about 20 bucks you can buy a lazar temp gun they work just ducky and pretty accurate go around pointing at things it will tell you a story.

If that is what you have it is well worth fixing that's a pretty hefty generator. Another big + is is also a 4 pole generator this means it turns half the speed of a "normal" RV generator meaning half the noise level. Most generators like that are 2 pole generators meaning they have to turn 3600 RPM to make 60 CPS I'm just wondering if it's a little big for a small camper I don't see any size spc for it so that might not be it. I run my entire house with a 5000 watt generator! Onan made some 4 poles RV units too but for the bigger RV's at 5000 watts.

I'm kind of leaning towards a head gasket. Quick check is a shop with an exhaust gas analyzer to sniff the coolant.

Very nice custom looking job. Tell me about the RecPro door I'm stuck with the only thing I can't fix in my camper rebuild it has a sit down tub/shower that is on top of things like water pump and assorted other plumbing and it sounds like the door might be able to hide all that.

Good thing you found it before it set fire to some thing!

Yes they will but you will still have weak springs only a bit higher. Me I would hit up a local spring shop and have them make you a set. My old Nova Star had a 9 leaf spring pack yeah it did ride a bit rough I'm guessing they were for a real one ton truck.

Did they leak or is water poring out the bottom of the RV?

It's not a job for the faint of heart but diesels take to turbo's like ducks to water. It still will not be a blazing performer but every little bit helps. That by the way is a great little diesel.

They make a "flat" hose that is very flexible even in cold weather and it won't kink. Any big box should have them.

I will add with the on board generator all of your outlets will be working to plug what ever into.

There were two types one was a Koller read loud! and a Onan one of the big benefits was remote start from inside you could run the generator while driving charging the camper battery and keeping the coach cool, most likely you can have the generator repaired for a good bit less than a new portable one. Take it to a generator dealer or an independent shop that does small engines.

Yes you can buy R134 but not R12 unless you have a 609 certificate from the EPA. Oh I'm sure there are people selling R12 and other stuff beyond refrigerant but for the average person it's not for sale. Shoot I have seen propane in AC systems.

Read this before buying and it's like $70 for 20 OZ of CCL2F2, epa.gov/section608/refrigerant-sales-restriction

The bottom line R12 is made of "unobtainium" and for good reason. I kind of think sticker shock will put an end to the AC project. Backwards facing vent windows and 60 MPH.

We it is at least it's on a proper size truck!

Good read on old R12 systems. hagerty.com/media/maintenance-and-tech/air-conditioning-dos-and-donts-refrigerants-and-the-law/ Back in the day I did dozens the caveat was "working system" Retro fit presented issues but eventually they were over come to some extent. You will have issues if the system does not work to begin with sad to say.

The existing original generator fuel line is not pressurized how ever the portable generators do not have a fuel pump to draw fuel from the tank they are gravity feed. Do not even think about connecting it to a fuel injected port any where, the fuel pressure is way too great and you soon will have gasoline every where.

Generally they are easy to escape the MH usually doesn't make it.

"Devil's advocate", you now have a gallon or so of gasoline inside the RV with a running engine in a plastic container and a fan that draws 5-10 amps from the battery. About 20,000 RV's die in fires a year.

Wow There is a lot to see this is a good one though nice campground there too. vermonttourismnetwork.com/quechee-gorge-vermonts-little-grand-canyon/