JD 820 3 cyl diesel fuel problem

[Tinhack]

I've never attempted to turn flywheel with a pry bar on a JD 300 series engine. Have you attempted this feat?

Only on my 420 gasser.

 

[fullchoke]

When cranking the engine, it sounds even. Not like a cylinder has compression loss. If the knock was bad, would I be able to hear it from compression loss? I don't think it will knock unless it's running. How do you test compression on this engine?

 

[Tx Jim]

To check compression one needs to remove all 3 injectors & install a compression test gauge separately in each injector bore. Rotate crankshaft & note pressure for each cylinder. Brg knock would be more pronounced if each cylinder was firing

 

[fullchoke]

I removed the oil pan, but I can't tell much because I can't rotate the engine with the IP off. I may put it back on. One thing is someone had it off before, and put it back on with a ton of silicone and no gasket. Makes me wonder why it was taken off.

 

[Tx Jim]

You can remove main brg caps to visually inspect main brg inserts without the need to rotate crankshaft.

 

[Zebrafive]

This sounding more and more like a parts tractor, not worth the cost of fixing. My guess is they gave up and sent it to auction.

 

[fullchoke]

I'm thinking the same thing, except it was an estate sale where the original owner was deceased. I think he was an invalid for a long time before he passed, that was why it sat so long, then got the attempt at running, then sat another 10 years. I say this because the break on the IP driveshaft was very old. They probably knew something was wrong when they heard that IP driveshaft break. If the engine is still ok, I'd be willing to keep going. I have a use for the tractor and loader, and anything this size with a loader doesn't come cheap here.

 

[etpm]

You can remove main brg caps to visually inspect main brg inserts without the need to rotate crankshaft.

Since the main bearing caps are removable I would buy some Plastigauge ( Genuine Plastigauge - How It Works ) and check the main and conrod bearing clearances as well as visually inspect the bearing surfaces. If the surfaces look good and the clearances are within spec then I would risk spending the dough on the IP.

 

[Tx Jim]

Since the main bearing caps are removable I would buy some Plastigauge ( Genuine Plastigauge - How It Works ) and check the main and conrod bearing clearances as well as visually inspect the bearing surfaces. If the surfaces look good and the clearances are within spec then I would risk spending the dough on the IP.

I agree if all 3 rod brgs pass a similar inspection/test.

 

[Zebrafive]

I'm thinking the same thing, except it was an estate sale where the original owner was deceased. I think he was an invalid for a long time before he passed, that was why it sat so long, then got the attempt at running, then sat another 10 years. I say this because the break on the IP driveshaft was very old. They probably knew something was wrong when they heard that IP driveshaft break. If the engine is still ok, I'd be willing to keep going. I have a use for the tractor and loader, and anything this size with a loader doesn't come cheap here.

OK, I was thinking consignment auction, where a lot of problems get "sent down the road"

 

[Zebrafive]

I second checking both main and rod bearings and looking at bearing 1/2s and bearing surfaces of the crank.

I don't think JD offered a HD front axle for loader use, but I would want it to have side frames.

 

[fullchoke]

I need to get the broken IP driveshaft out of the engine. I removed the nut and washer along with the spring and cap, but it is a keyed, tapered shaft. How do I get it out? No room to swing a hammer with the radiator so close.

Thanks

 

[fullchoke]

I'm finding it hard to find time for working on this tractor, it has been on the back burner. I finally removed the radiator so I could see the crank pulley. It has a U mark, it also could be a lightly stamped 0. Advanced quite far from that is an S and very close but further advanced to that S is 28. Would TDC be the U looking mark? I know that I will have to determine which revolution is TDC. The manual says nothing(I can find)about these marks. I'm guessing the U should be a Zero for 0 degrees and was dented, worn off, or never stamped well. Plus what does S stand for?
Thanks

 

[Tx Jim]

Inj pump timing marks for JD diesel engines are located on engine flywheel not front crankshaft pulley. Timing opening is accessed on LH rear of engine on flywheel housing. After removal one reverses window cover retaining bolt to put in timing hole in flywheel.
I highly recommend you acquire a JD tech manual #4212 $93.33 from Search for Equipment Publications - Technical Information Store or call 1-800-522-7448 or place of your choice. I will caution you that some aftermarket tech manuals are not reproduced very well.

 

[fullchoke]

I have a 4212, but it isn't helping me with the crank pulley. I asked a John Deere mechanic at a Kenworth/JD dealer and he said to use the crank pulley, then check that the #1 valves are closed when on the mark. The pulley has the marks I mentioned, but I'm not seeing anything about it in the 4212. The 4212 doesn't cover my injection pump either. The version of the 4212 for my tractor, doesn't seem to be available. The dealer parts guys couldn't find the info either. Why did JD put marks on the pulley with a place on the housing to line up with, if it isn't used? The info in the manual about the pin isn't detailed well either. The dealer could't find any detailed info in the parts manuals either. They could only guess what I had, that is why he said to use the pulley marks. I thought the marks would be more obvious in their meaning. I was there an hour.

 

[Tx Jim]

I checked a tech manual that I have access to for a later model 2040 that has similar 3 cyl engine & determined that it is very vague when it comes to inj pump timing info. Read the following information. http://dandcdiesel.com/resources/JD_3_4_cyl_20_30_40_Series Remove.pdf

 

[fullchoke]

Thanks Jim, that is helpful. The more info I get helps complete the picture.

 

[Tx Jim]

You're welcome