Pony Engine Crankshaft seal

....................gotta love a excavator, its only when youve got one you wonder how you ever managed without.

It sure worked better than the 2 fork lifts I used to remove the other engine, it was very effortless, took me about an hour to do the whole thing.

The seal is not a hard job, pop the flywheel off and it's right there. Scary thing is that usually if the seal goes it means that the bearing has left and taken the seal with it. Check the bearings, if the crank bearing is worn out, your new seal won't last long.

Good Luck!👍

Wow Zootown,
Thanks for the great news. Both of my pony motors have leaky seals.:rant:

[quote="Jeffreytoddrennix"]Wow Zootown,
Thanks for the great news. Both of my pony motors have leaky seals.:rant:[/quote]

Yeah, I hate to be the bearer of bad news, ...er, well it's not so bad news if it's not my equipment.😆😆😆😆😆

Seriously, if the bearing is a bit loose it will destroy the seal and that goes for just about anything mechanical. My D2 pony had a crank seal that would dump a pint of oil about every 7 minutes of running time and you could watch the flywheel bouncing up, down and all around as it ran (but it still RAN right up until it threw a rod). I'm at the point now where I need to rebuild one of my other pony motors to put on it. So many projects, so little ambition, I mean,...so little time.

The bearing seems good and tight, I can't move the flywheel up and down on this one like I could on the engine I am parting out.

Hope someone has this thread tagged as it is old. Well, we shall see.

Seal behind flywheel is leaking. This D4 sat for 12 years in a field. Pony motor runs great after a little fuel tank cleaning etc. but leaks oil from behind flywheel. We keep oil added whenever we start it. I am fairly certain seal has just dried out from sitting. Main engine runs great. My question- Can the seal behind the crankshaft flywheel be changed without pulling the pony motor.

Thanks, Oletrapper 1952 D4 7U

Yea, it can be done.

Of course remove flywheel first and then you can either remove the whole front plate that has the seal and main bearing so the seal can be driven out from the back or pried out with a big screwdriver....

or carefully drill a hole or two in the seal and screw a sheetmetal screw in to pop the seal out with a small bar, claw hammer etc. Be especially careful to avoid any damage to the sealing surface of the crankshaft while drilling or prying out the old seal.

Need to critically evaluate the state of the bearings and how much slack there is both side to side and in and out. Might be false economy to just replace the seal if there is a lot of slack.