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On the bright side, you have a data point. No oil leak, yet. That may not be the data point you wanted. Did you double check that you can see the dye, on say the dipstick, or dribbled off the dipstick on a white paper towel? (Control data point, right?) If it were me, I would have another look...

Any Yanmar dealer, if you have one in the area. (I think that the part is Yanmar 783350-51701, but be prepared for sticker shock.) $250 on eBay at the moment... Chinese knockoffs online if you need it now, just make sure it is for the L70 engine. I have bought the ITACO version for L100 and it...

As @Guyfang wrote, it doesn't take much to short out this style voltmeter, at least in my experience. The wires in the coil are very, very thin. Although I was told a slightly different story that the movement of the needle alone, e.g. in transport, could generate enough voltage to short them...

I'd remove the springs (coils), if it were me. No sense in risking a short to the case... All the best, 2Pbfeet

Congratulations on freeing up the control arm. The Yanmar manual warns about damaging the control arm if the pin is not seated in the yoke, but your control arm looks to be in the ball park. With luck, the governor itself is not stuck or damaged. As @kloppk pointed out above, I will say that...

👍👍 Yes, total brain freeze on my part. I do know a couple of ways to make the 12V glow plug work, but as the correct 24V 182 CH42 glow plugs are available, no reason to call on your special electrical ninja abilities. Save them for something special. All the best, 2Pbfeet

Thanks. My bad. I did know that. CRS strikes again.

I think that is about the going rate (eBay), though you can spend more buying it elsewhere. Wasn't there a batch of mislabeled ones that were 12V inside awhile back? The issues finding the 182CH42 keeps coming up. I think that the glow plug cross references with an Onan 333-0107, and also...

@Ray70 Thanks! (And that looks like a spiffy welding job. Clamps aren't the easiest item to weld.) All the best, 2Pbfeet

I think given where @jqc99 seems to be at this point, it might be a PITA that might be warranted, too. An impact driver or drill with the right torque settings makes pretty quick work of it, and when you drop the nuts over the air filter for the umpteenth time, you can put in a couple of rivet...

FWIW: I have used reverse forceps, also known as Dieffenbach for those fiddly items. For me, the forceps can do the holding while I do the maneuvering. (Less of "pat your head while rubbing your tummy thing" for me.) These days you can get them in all sorts of sizes and strengths. For those with...

@Ray70 Thanks! The description above helped me understand the whole process a lot better as well. Thank you. I have a vague memory of working on an engine with a set of similar split retaining rings. What I chiefly remember was what a pain it was. Herding cats doesn't do it justice. All the...

Do you have a photo of your spring clamp tool? Just curious. I'm visualizing something like a better version of a valve compression tool. All the best, 2Pbfeet

Given the recent emergence of this leak, the location of the stains, and the staining pattern, I would again (post #9 above) say that I really think that this is a diesel leak, not an oil leak. If this was a proposition issue in the casting, you would probably always have had the issue. All...

Just FWIW: In my experience brake cleaner (usually a mix acetone and some organics like pentane/hexane) can be pretty aggressive and may eat into the engine paint. I know the CRC brake cleaner dissolves the CARC. I think that Dawn, and Simple Green, are more benign, at least in my experience...

There are openings in the rails for forklift use on the sides, and I have used forks to lift them lengthwise as well, but I would not recommend it as a general practice as there is no "floor" under the forks, making a tip over a damaging possibility, as others have mentioned. I needed to unload...

@1FAST4 One other item: I wouldn't trust your Hz meter, without verification. It seemed to be jumping around far more than the engine rpms. All the best, 2Pbfeet

Nice photos, thanks! To me, I don't see a smoking gun of a leak in the center of the engine bay, nor on the engine itself. The other item that seems a bit odd to me is how high the stain runs on both sides of the enclosure, raising the question of where it is wicking from. If it were me, I...

@1FAST4 What @Scoobyshep wrote is what I noticed as well. You didn't (I think) have a variable load, and yet the governor linkage is moving all over the place trying to keep the engine speed constant. Plus, there is a perhaps subtle shift in the engine sound at the same rpm, as if something...

Listening to the videos and watching the governor move, it doesn't seem that the position correlates well with the engine speed.