Yanmar loses power, slows down & kills

[irwin]

Dudley, Just bumping this up so it stays current.

I imagine your fairly anxious as time goes by, I'd probably use this as an excuse to buy another tractor-(tell the wife I'll be able to sell one of them for more than I paid for it).

 

[tallyho8]

Today they finished rebuilding my injector pump and I brought them my 3 injectors to check again. The injectors checked good. I put it back together and-SAME THING! After it runs 10 minutes, air bubbles come out of the injector pump into the fuel line until they block the fuel flow and kill the motor.

I am at a total loss at to what could be causing this problem and I still have not found a diesel mechanic who will work on it within 100 miles of my home.

My tractor has been laid up too long and I have too much work to do with it so I decided to rig it to run so I can catch up with some of my work. I attached a drawing showing what I did to make it run. When you look at the setup, the first thing you might think is that the tank vent is stopped up and I made a new vent. My tank vent works well and the problem occurs even with the fuel tank lid off so that is not the problem. After I made this rig, I worked my tractor for 3 hours with no problems. I am not sure if running it like this will lead to any future problems but I have no choice at this time. If it keeps running OK with this rig I will leave it like this until I can find a diesel mechanic to fix it correctly. I have already spent over $400 trying parts on it without success and I am now giving up trying to fix it correctly myself.

Since air bubbles in the fuel line were stopping the fuel flow, I put a "T" on the line by the injector pump and ran an "air bleed line" up from the "T". Rather then just having the line vent to the atmosphere and possibly get contaminants dropping into it, I put another "T" on my fuel return line between the thermostart tank and the fuel tank and I connected the "air bleed line" to this "T". Now the air bubbles that come out of the injector pump into the fuel line go out the "T" into the "air bleed line" and into the other "T" into the fuel return line and back into the tank.

Perhaps some diesel mechanic will see this rig some day and figure out what is causing this problem. Until then, I will never be quite comfortable on my Yanmar again, always dreading that this problem will return................

 

[California]

... always dreading that this problem will return....

I predict your redesign has solved the problem and you will run the tractor for years uneventfully, finally forgetting that gimmick is even on there.

You're out the other side of it - don't look back.

 

[BatesBunch]

Mr. Tally,

I apologize for not being able to post sooner, but I did not know that it took so long to get an account validated. I have been following your situation as well as looking around the site for a little while.

I did some calling around back on 11Feb to see if I might be able to locate someone in our area that might be able or willing to work on your tractor. I work in New Orleans and live in Picayune, MS. We should be well within your 100-mile range mentioned in previous posts.

I came home to register and post my findings. Everything went through, but I never received an e-mail stating that my account was validated. Ten days later, on 21Feb, I decided to re-register with another account. Sunday evening, 24Feb, a message was sent stating that the account was validated (I haven't been on the computer at home to see that message until this evening). The first account still has not been validated.

Anyway, here is what I found. There are two dealers here in the Picayune area that are willing to work on your YM1802. I spoke with both dealers briefly and 'generically' about your problem.

The first is Tractors Plus located on Hwy 11 in Nicholson, MS (Exit 1 off of I-59, approximately 12 miles north of the I-10/I-12/I-59 junction at Slidell). They deal mainly with Yanmars. They used to import their own tractors and then get them ready for resale, from what the owner told me on a previous visit. They sell yanmars that have been 'reconditioned' and have the safety features added. They stated that they would have no problem working on or obtaining parts for your model tractor. Their information is as follows:

Tractors Plus
1977 Hwy 11 S
Picayune, MS 39466
Ph: (601) 798-0280
Current Labor Rate: $65 per hour

The second is Cuevas Tractor located on Hwy 43 about halfway between Picayune and Kiln, MS (approximately 13 miles from Exit 4 off of I-59). They are a Farmtrac dealer, but will work on just about anything. Their information is as follows:

Cuevas Tractor
22011 Hwy 43 S
Picayune, MS 39466
Ph: (228) 255-0228

Cuevas also passed along that they send all of their injection pumps over to Pine, LA for service. They said that he was very good and recommended him as another possible source to help you. That information is:

Pine Fuel Injection Service
54233 Hwy 436
Franklington, LA 70438
Ph: (985) 848-9087

I hope that this information can help you or a possible future reader of this thread in our area. Again, sorry about the delay.


Harley

 

[MJPetersen]

Talley,
with your clear line on there you cannot tell which side the bubbles are coming from. You should be able to see if they are coming from the filter side or the pump side.

This is a most perplexing thing. And frustrating. I am glad that you figured out a work-around.

Mike

 

[tallyho8]

Harley, welcome to TBN and thank you very much for the information. I had not heard of Tractors Plus but I will check them out next time I drive by that area. Hopefully, my tractor will run ok with the rig I have on it now.

 

[tallyho8]

Talley,
with your clear line on there you cannot tell which side the bubbles are coming from. You should be able to see if they are coming from the filter side or the pump side. This is a most perplexing thing. And frustrating. I am glad that you figured out a work-around.
Mike

Yes, I can clearly see the bubbles coming out of the injection pump and not from the fuel filter side. I had several people tell me this can not happen, but I must believe my eyes.

 

[tnbowhunter]

I've been following this thread since your first post. I would be frustrated to no end. Glad you got it running again, hopefully it will continue running fine or you can find out the real cause.

I just wish I could help out but I have no idea what can be causing those symptoms.

Congrats to you for finding a way to "make" it run. Nothing like good ole Yankee ingenuity!!!

 

[AlanB]

I wish I could help, but am very glad that at least you have it sorted.

I often operate on the "it works, don't mess with it" mode of operation.

(of course there is a peice of bailing wire sticking under the Kabukie bob's seat to pull the fuel shutoff

 

[jimmer2880]

Glad you got it fixed. That had to be extremely frustrating.

If it were mine, that rig would sit like that until she stopped working for good.

I have to wonder how many of us have small bubbles in our lines and don't know it, just because they are small enough to not cause any problems?

Did the original line going from your filter to the pump have any bends in it that would collect the bubbles like your clear tube? I wonder if the problem was the bubbles themselves, or simply the collection of bubbles?