[mikeduwe]

I picked up this engine at Little G this weekend.

Is the same basic engine as in a 430, but I don't know for sure what it came out of. The radiator fan is on the "rear" of the engine, similar to a 332. Exhaust mainfold looks to be the same as the early 430's.

Looks like these engines went in compact utilities and front mounts as well.

I think the bores are shot just from looking at them, but the price was right and if I can use it it will make a neat repower engine.

I have a 322 frame and blown engine, I hope I can swap a bunch of the 322 parts on this engine to make it a runner, assuming the bores arent too far gone. Might even entertain dropping the engine in the 322 frame and seeing if I can make a tractor out of parts.

I know yanmar parts are very expensive, I may have to sit down before I ask what a set of oversized pistons and rings, along with a gasket set and rod bearings are!

Anyone have source for yanmar parts besides JD dealers?

 

[Richards]

Mike,
I know very little about Yanmar engines, other than they are used in everything from small tractors to big tractors to dozers and lots of other machinery. Maybe spending some time looking for other suppliers than JD might be one way to go, and may cost you less.

Richard

The Banjo man

 

[rfn]

Mike,

I'll try and answer what I can. Your engine looks to have come from a front mount mower just by looking at the exhaust manifold. An F935 perhaps? And this is a 3TNA72UJ (early engine) and not a 3TNA72UJ2 (later engine)?

Also I have seen Yanmars used in the boating industry as well as reefers.

As to other parts suppliers, I actually tried once taking in the model and serial number of a 3TNA to a true Yanmar dealer. The parts guy told me flat out that he couldn't get parts. It was a contractual obligation for Yanmar with Deere in North America.

Deere does have rings and pistons, 10 and 20 over. Last time I checked it was spendy. So Gird yourself for the Ordeal when you get prices. Either be sitting down or have smelling salts handy.

Finally the engine *should* fit in your 322 frame. It will just sit higher because of the longer stroke. You may need to use the '22 exhaust manifold as well.

regards,

rickn

 

[mikeduwe]

Rick, it has a John Deere oil filter on it, so I'm assuming it came out of something green.

I have the tools to measure the bores, but from the ridge in the cylinder wall, it is likely worn to the point of needing some machine work and oversized pistons.

Unfortunatly the starter from my 322 does not fit as its a 0.8 and this engine would have used a 1.0. I may be able to put that "flywheel plate" from the 22 on and use the smaller starter to turn it over.

The manifold probably wont be interchangable, since they larger bores make the cylinder head longer. The way the manifold is on there, I bet a turbo would fit right in place of the battery though!

 

[chuckv]

Mike,

I think that the "John Deere" emblazoned across the top of the serial number tag is a far less subtle clue of its green origins than the yellow plastic oil filler cap...

The turbo sounds like a great idea to deal with the exhaust manifold...

I have the manual on the diesel Gator, it used the 3TN66C-Juv and EJUV engines at 18 HP. The TM1518 Gator manual contains about a hundred pages of detail on the engine if that would be of interest...

Chuck

 

[mikeduwe]

Chuck, A tag like this:

First thing I saw was the yellow/orange plugs thats why I thought it was a JD engine.

Looks like the F935, as Rick mentioned has the same fan/radiator configuration as well as exhaust manifold. Found this picture:

Also the 770, but thats a green engine, has a different intake and breather setup and exhaust:

I would like to see that manual. [email protected]

Thanks!

 

[steveh]

Mike,
I have two of those 3TNA72 engines and I was planning to build a replacement for my 332 until I discovered that the block is longer than the 3TN66 in the 332. I forget how much longer it is but measure your valve cover front to back on the 332 and this engine before you put too much money into it. The 430 TM has very little info on the engine, you need CTM3 for engine info. I have a CTM3 if you need me to copy some pages.

 

[mikeduwe]

I have the 220 series Yanmar service manual in print.

I do know the engine is longer, would that mean that the fan would hit the radiator, or that the pto clutch would be to far forward and the valve cover would hit the battery or all of the above.

I'm not worried about the pto or battery. Dont need a pto to plow, and the battery could be moved to the front like a weight box.

Cooling with the 332 radiator might be tough too, but for short runs plowing, or if an electric fan was added, it might work out.

 

[steveh]

I'm like you I would not need the PTO clutch for a plow tractor so I suspect the entire engine could be positioned so the fan was in the correct location relative to the radiator and the other end of the block would just move forward some. I made some rough measurements and I think it would clear the stock battery mount but I like the idea about the front mount battery box. I honestly don't know if the 332 radiator would cool the 3TN72 but I suspect it would not be a problem if the radiator was clean and in good condition. One could always add an automotive style heater core behind the grill in addition to the radiator if cooling were an issue.

 

[332bill]

Mike the 220 series manual shows this engine was in the 430, F925, F935, 755, and 756(golf & turf)

Bill

 

[mikeduwe]

Well, I measured the bores and they are all in spec.

The middle cylinder was worn the most, but they are all under the wear limit for standard pistons. I still might get a second opinion.

Deere wants $67 for a head gasket, which is a lot, but I might just get one and see if it will run. At that point I will evaluate it and see if I should hone the bores and put new bearings and piston rings in the engine

I will have to dig that old 322 frame out to mount the engine in for a run stand.

 

[jd_bob]

How many bolt holes are in the crank pulley? The F935s used 3 while the 430s used 4.

I rebuilt one of these engines. I put in .010 over pistons and rings. I used the old bearings since there was very little wear on them. The parts and machining cost me about $800.