Found the 520's oil leak, help!!!

[truckin88 104]

it looks to be coming from behind the PTO pulley to the left when you look at it head on. The previous owner said it burned oil, I think he over filled it. It did not start right away before, but I put new plugs, new air filter, new battery, starts first try now!!!

[Jim_M 179]

It sounds like it might be the crankshaft seal leaking.

[jaysmith801 0]

there is also a welch plug right above the craftshaft.

[truckin88 104]

big job??? can I get the seals?

[Jim_M 179]

I forgot about the plug, that's a very good possibility also. Pull your pt off and see if you can pinpoint where the leak is.

The seals and welch plug are available.

[truckin88 104]

what about the crank case breather tube???

Whats a welch

[truckin88 104]

looks like the crank case breather tube did it, cleaned it in the sink, no more leak..... changed the oil to rotella 30, did not change the filter yet, i have one on order from petes/lawnmower stuff, so if it comes this weekend I will do everything.

[linen beige 16]

Whats a welch

That's the "proper" name for a "freeze plug".

Glad you got her going with no leaks!

[lotus1967 0]

:thumbs2: This may sound real stupid, but is the 520 a liquid cooled engine? I was unaware any Wheel Horse was liquid cooled. If wrong, I understand the Welch Plug, but if not-?????

[truckin88 104]

no air cooled, I believe the only liquid cooled would be a D-250

If it would stop raining in NY, I could test my fix out more.....

[lotus1967 0]

anybody know why, then, a welch(freeze)plug in an air cooled engine?

[jaysmith801 0]

It's right behind the rear of the camshaft probaly just for access to the cam bearings

[wh500special 2,359]

I was unaware any Wheel Horse was liquid cooled. If wrong, I understand the Welch Plug, but if not-?????

Liquid cooled:

D250 (4-cly Renault)

520Lxi (2-cyl Kawasaki)

523Dxi (3-cyl Daihatsu diesel)

All three are awesome tractors

The welch plug *might* be a plug used to remove casting sand from when the block was poured.

Steve

[lotus1967 0]

both responses make sense. Thanks

[linen beige 16]

The welch plug *might* be a plug used to remove casting sand from when the block was poured.

Or to plug access holes used for machining bearing surfaces, etc.

Most "V" configured engines with a single, central camshaft use a welch plug as a camshaft thrust bearing.

There are also small ones in most of our 'Horse's carburetors.

[truckin88 104]

It ended up being the rear bearing plate gasket, I changed it out and changed the end oil seal as well.

Thanks for all the help pictures soon.