Yanmar YM2220D - What is this hole for?

[Lunarius]

Hello together,

can someone please tell me what that 10mm hole down there is for?

Time to time oil drips out of the hole.

Thanks

 

[winston1]

That is in the bottom of the clutch housing. Hard to tell from the picture but either your engine seal or transmission seal probably just leaking a little. If not bad then nothing to worry about. There should not be any fluid in there.

Not sure about the 2220 but I know some models have a plug in there, not sure why, maybe to keep rice paddy water out. If your hole is threaded then it might have had a plug at one time, However, if a seal leading a tad I wouldn't put one in there.

 

[normde2001]

Yep, a drain hole for oil leakage into the bell housing. Normally a rubber plug there to remove and drain, prevents dirt dauber nesting in the bell housing. I would put somehing in there. There is also one on each brake housing for the same
purpose.

 

[careyo63]

When I seen mine plugged I was wondering the same thing. I seen this earlier and with it being motor Oil I guessed the same thing. But you housing is different so I wasn't sure that was what it was. Mine came out very easily and nothing drained. And the same thing happens with it out. I put back in since it would cause a small drip. I kid you not! Don't think I don't check it and get Nothing. Leave it out and I get a spot around the size of a Nickel a Quarter a little much after use.:confused2:

 

[normde2001]

Could be either motor or transmission oil leaking into the bell housing. Y'all remind me, I have not checked mine in a few years, but no noticeable oil usage and clutch still works good..

 

[clemsonfor]

Yea the plug keeps water out when these are operated in submerged conditions. Mine is a threaded metal pipe type plug. You can pull it to see if it leaks. Not a big deal to be in or out since most of us don't operate in 2 to 3 ft of water. A small drip just means you have a weepine seal . Just like a car. Who drives a 35 year old car that doesn't have a weeping seal or 3.

 

[careyo63]

Well @ 5:45 I pulled it. Had to go out back anyways It was 6:30 and not a drip. The plugs Been in all summer If not longer that I can remember. The plug was wet so without a doubt it's Eng. oil by the looks/feel and smell. My guess is with the plug in it creates just enough back pressure to seal it up. Or keep the oil from passing bye it. ?

 

[Lunarius]

Hello everybody,

Thanks for all the answers, so I'm a bit calmer now
I noticed it only recently when I started the tractor in cold temparatures with 20 seconds preheating, the first 2-3 minutes it drip out about 10-15 drops of Oil.
After about two hours work I have put the tractor back into the hall and it came overnight maximum of 2-3 drops out.

No thread, just a hole.