D47U time for a pony rebuild?

Might check the crankcase vent for blockage

verify you don't have fuel in your oil

check the crankshaft for play, and do a compression check on it

Good ideas, thank you. The rear seal has always leaked a bit, but the crank never has any play. I had not thought about the crankcase vent. I'll take a look.

sounds like a plugged crankcase vent to me also. thanks for posting this.

well, I'm back - the weather and time finally cooperating. with good news and bad. The good news is that the crankcase vent is clear and very. I pulled the heads - water jackets very clean, cylinders are polished, but no ring wear or scoring - the head bolts were loose, though, but no apparently leaking. Compression is 30+ on both cylinders testing with a couple yanks on the rope (i'll try it with the starter when i get it back together). The bad news is: with nothing to fix, so I'm not sure what to do next. any thoughts would be appreciated.

while i have it apart, I will change the belts. Can someone provide the belt sizes or part numbers? 1953 D47U - i searched the forum, but no luck...

Try Gates 93890 for governor
Gates TR22425 for starter
Numbers are from the Gates cross reference website
Cat # 5B7168 governor belt
#6B5653 starter belt
Russ

Did the dancing dipstick spit oil too?

Oil wasn't diluted with gas was it? If that was not the case, If it was mine I would pull the pistons, give the cylinders a hone, replace rings, gaskets and belts and be good to go for another 50 years.

I even rolled one piston to the bottom of the stroke, put a bead of grease around cylinder to seal the groove at top of piston and then honed a rusty cylinder. Cleaned it up with solvent to get rid of all the dust and put the head and new gasket back on. Definitely a shortcut but it runs as well or better than before and head gasket doesn't leak now.

[quote="43gpw"]Try Gates 93890 for governor
Gates TR22425 for starter
Numbers are from the Gates cross reference website
Cat # 5B7168 governor belt
#6B5653 starter belt
Russ[/quote]

[quote="ccjersey"]Did the dancing dipstick spit oil too?

Oil wasn't diluted with gas was it? If that was not the case, If it was mine I would pull the pistons, give the cylinders a hone, replace rings, gaskets and belts and be good to go for another 50 years.

I even rolled one piston to the bottom of the stroke, put a bead of grease around cylinder to seal the groove at top of piston and then honed a rusty cylinder. Cleaned it up with solvent to get rid of all the dust and put the head and new gasket back on. Definitely a shortcut but it runs as well or better than before and head gasket doesn't leak now.[/quote]

yep. it did spit oil out the dipstick. i have had problems with gas in the oil so i watch for that. when i did the compression test, i also did the oil in the spark plug hole test - compression improved for sure, so I'm all but sure it's the rings. The rear seal leaks a bit when i have to run the pony for long (starting the diesel at -20 takes a while) and the rust in the tank is a pain (but i just fixed that problem), otherwise the pony seems to be in great shape.

are you suggesting redoing the cylinders/rings without pulling the engine? In other words, just pull the top end off and do it in place. I have everything off to the point of changing the belts - so, there's not much left.

thanks for the discussion...