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An update: I had time yesterday to top up the oil and run the engine for about 15 minutes. I seemed to have stopped the leaking, at least for the time being. I realize my repair could fail at any time so I will keep my eyes open for a replacement cover.

"Also, it looks like the crack appeared on the outside of the cover." The crack was through before I started.

I had some time today so I soldered it with a Durafix rod. I washed it with degreaser and then used a Dremel tool with a conical tip to follow the crack and widen it a little. It took a while but heating it from the other side I was able to get the solder to flow and laid down a pretty good...

I have a box of Durafix brand aluminum solder rods. It says a melting point of 750F. I'm going to give it a try.

I might try this. The thing is, it's not leaking through the crack. It's flexing at the crack and leaking around the gasket. So a repair would have to be quite strong and stiff. Also, 250F doesn't sound very hot for an engine repair.

So an update on this: I talked to Tommy at Affordable Tractor, he had a cover for a YD480. I have a YD485, but since they use the same gasket I thought I'd give it a try. Well, I tried it today, it doesn't work, it's not quite deep enough for the rocker valves. I used the tractor today for...

Thanks. Since it doesn't leak through the crack, but around the edges when the cover distorts, I'm thinking of something similar if I can't find a replacement: seal it with RTV and replace the nuts with lock nuts, and tighten them just barely tight enough to hold the cover on.

The only one who's ever worked on this engine is me! The last time I adjusted the valves I had a hard time getting the cover off, I whacked it with a block of wood. I'm thinking that might have cracked it. I put those bolts back on with a torque wrench so I don't think I overtightened it.

So far the only site I've found that even has it listed is Circle G, but it's out of stock: https://www.circlegtractorparts.com/valve-cover-yd485 I was hoping they'd have a part number that I could Google but they have the SKU as "Valve Cover-YD485." AliBaba has this, which is close but not...

I had a chance to look at it today. It turns out the valve cover is cracked: When the bolts are tightened down it flexes along the crack and bulges out. I have to see if I can get a replacement.

Has anyone experienced a bent valve cover on their inma? Background: I checked the oil before starting and it was very low. Looking under the hood, there was oil all over the right side of the engine compartment. So I topped it up and started it and looked, and oil was leaking out under the...