520-H PTO GASKET --- OIL LEAK FOUND

[truckin88 104]

So I took my side tins off, and inspected my drive belt, and it is in really good shape. The PTO belt was just replaced by me, well I posted about an oil leak on my newly aquired 520-H, I thought I fixed it cleaning the crankcase breather, all it did was slow the leak down. I now found it is the PTO gasket. Where do I get a new one? Will I need special tools to replace, any other gaskets replaced while I am in there, I have never done this job so all info is appreciated. I guess at least I know it does not burn oil now!

HELP!!!!!! PLEASE!!!

[truckin88 104]

anyone? could I just use RTV?? I doubt anyone has one in stock.

[catman81056 3]

PTO gasket? All my tractors are older models, but I've never seen a PTO that contained oil. Is the crank seal leaking or maybe the side plate gasket?

[truckin88 104]

It is the gasket between the block ande the round plate directly behind the PTO pulley/ drive belt pulley. Sorry for not know the correct terminology here. Hope this helps. There is a gasket as I can see about 3 inches that are sticking out broken off.

This is an Onan 20HP Twin

[truckin88 104]

the round gasket with bolt holes seen here:

http://cgi.ebay.com/NEW-ONAN-BF-B43-48-P-2...alenotsupported

Thats what I am talking about, who would carry one locally? what is it called. How hard is it to replace, any help is appreciated.!!!

[Jim_M 179]

The plate you're talking about is the crankshaft bearing retainer plate. That kit you linked to also includes the crankshaft seal. It's a good idea to replace the seal while you've got the retainer plate off, if you don't there's a good chance it will leak when you put it back together.

It's not a hard job.

[truckin88 104]

any speacial tools? where does the crankshaft seal go? Is it pretty basic once I am in there? I am guess the crankshat seal is one of the small round ones.

Any advice??? Thank you. Should I prelube the gaskets???

I ordered the kit.

[Jim_M 179]

Once you take the pto off take a look at it, it will explain itself. Use motor oil or light grease on the seal.

You'll need a torque wrench. Don't overtorque the retainer plate, remember you're working with aluminum....

[truckin88 104]

Once you take the pto off take a look at it, it will explain itself. Use motor oil or light grease on the seal.

You'll need a torque wrench. Don't overtorque the retainer plate, remember you're working with aluminum....

Thank you very much, will I need bearing grease for anything? Does this kit have all the seats I need for replacing that bearing plate seal on the 520-H It is a slow leak, but bothers me that it is leaking.

Is there anything else I should change out while I am in there. I figure I might as well get a drive belt while I am in there.

This is becoming more work then I expected, but when done it will be one heck of a machine.

[Bow_Extreme 548]

Sounds like you did get the answers you were looking for so I will disregard the PM you sent me. Jim M is correct. It's pretty straight forward to replace the crank seal and plate gasket. Good Luck!!

[truckin88 104]

thanks bow and Jim M for all the advice, I am hoping I am up to the task, but not sure, plus not sure how time consuming it is, with work and all. The kit is ordered we shall see.

Nervous about this, I am decent mechanically the finess stuff is not my strong point, anyone wanna trade a 400 series 8 speed for the 520, I will include the gaskets ha

Are there any special tools required, any other parts I should replace?

Thanks,

-Will

[catman81056 3]

Here's a tip to prevent oil seepage; use brake parts cleaner to clean all gasket surfaces, get every bit of oil residue off the surfaces. If you plan on using RTV sealer, dab just a small amount on the gasket surface and then use you finger to spread it around. You just want a thin film of sealer, not enough to squeez out when tightened up.

Just my .02, works real well for me.

[truckin88 104]

Here's a tip to prevent oil seepage; use brake parts cleaner to clean all gasket surfaces, get every bit of oil residue off the surfaces. If you plan on using RTV sealer, dab just a small amount on the gasket surface and then use you finger to spread it around. You just want a thin film of sealer, not enough to squeez out when tightened up.

Just my .02, works real well for me.

Catman, should I use RTV, instead of the gasket set I bought??? Should I use both?? Thanks.

[Jim_M 179]

You can use both, just don't get carried away with the RTV.

[catman81056 3]

What Jim said Remember, a "very thin" film of sealer.

[truckin88 104]

tear down has begun, since I have today off, 2 sets of seals are on order, this way incase I rip one.

[truckin88 104]

Ok I am doing a bunch of stuff at once.

Anyways, is there an easy way to get the drive belt out. I pulled up on the tranny disengage, but there is still tension....please help!!!