Re-ring JD 4400 CUT

[BCinVA]

I have a JD 4400 tractor manufactured in 1999. Yanmar 3 cyl. Does anybody know if it is possible to do an in frame re-ring?

 

[Roadworthy]

How many hours on on the tractor? Are you SURE it needs rings? If you can get the oil pan clear of the frame an in frame re-ring is probably an option.

 

[BCinVA]

Pretty low hours, about 1000. It is hard starting. Sometimes will fire, but many times have to give it just a little sniff of ether to start. Otherwise runs perfect. Had injection pump gone through by a good shop, and injectors removed and cleaned. Injectors in good shape. Checked compression while injectors were out. Checked about 390 PSI on all three cylinders. That is in spec but on on the very low end. Of course could be valves as well, but in either case have to take off the head. Thought if I could get pan off without too much trouble I would scuff up the bores and put in new rings.

 

[Kyle_in_Tex]

Pretty low hours, about 1000. It is hard starting. Sometimes will fire, but many times have to give it just a little sniff of ether to start. Otherwise runs perfect. Had injection pump gone through by a good shop, and injectors removed and cleaned. Injectors in good shape. Checked compression while injectors were out. Checked about 390 PSI on all three cylinders. That is in spec but on on the very low end. Of course could be valves as well, but in either case have to take off the head. Thought if I could get pan off without too much trouble I would scuff up the bores and put in new rings.

I've watched dfkrug (sp?) rebuild similar that had a worn hole in the intake system, allowing dust to bypass filter. A compromised intake can wear out an engine prematurely.

 

[Roadworthy]

If the engine will start and run have you checked whether your glow plugs are working? Starting fluid is not generally recommended for a diesel engine. It can fire too soon under compression, unlike a gasoline engine.

 

[Tx Jim]

According to 4400 parts this tractor is equipped with an intake heater not glow plugs, I wonder if intake heater is operational? I'll bet not operational.

 

[BCinVA]

TS Jim, You are right, it does have heat in the intake. It works fine, but doesn't help much when it doesn't start. When I am cranking and it don't start, I usually try the heat but it still won't start. I can give it just the smallest burst of ether possible, (just hit the button on the can and release immediately) and it will start right up. Of course I have to wait for heat elements to cool in intake before the ether.

 

[Kyle_in_Tex]

These engines are known to go for thousands of hours. I've seen them with 5000 hours still running.

TxJim, How does one know if their intake heat is working?

 

[beenthere]

I have over 1400 hours on my 4300, and very rarely will I add intake heat.. The Yanmar diesel hardly cranks at all and start-up seems instant.
Hope you find the cause of the problem.

 

[BCinVA]

Kylel-In-Tex, In my case I checked it while I had the injectors out and the pump at the shop. Everything was removed and the heater is right there in sight. You activate the heat by pushing in on the key switch. So it was easy to push it in and see if the elements heated up, and they did. Also there is an indicator light on the dash that comes on when the heat is activated. I am not sure, but I believe it is wired in a way that if the heat circuit was open it would not come on.