justkisssthis001
New member
asfar asi can figure out the fulepump might need rebuile . with all the changes in fule to lower and lower sulfer it has a bit of a drying out seal problem and that might be your problem
155D Starting Problems
- Thread starter N8-126
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N8-126
New member
Everyone sit down and hold on, the problem will knock you out of your seat. Before I explain what was wrong, I need to add some more details to the history of the engine. When I rebuilt the YM155 last winter, I sent the head out to have it checked for cracks and to have the valves seats remachined. I handed over the head with new valves and springs in a box and asked the machine shop to put the new ones in after machining the seats.
When I ran out of other options, I ordered new injectors from Hoye. I figured after 30 years it couldn't hurt to replace them. When they arrived I took out the old and noticed that what I saw inside the injector hole did not look like the pictures on Hoye's website. So after a couple of conversations with Sam (parts guy at Hoye) we realized that the upper injector chamber was installed backwards. I flipped them around, put new insulators and injectors in and she is good as new (I think). Appearently, during part of the inspection or machining process the machine shop removed the injectors and injector chambers and put them in backwards.
How the tractor even ran is beyond me. With the upper chamber in backwards, it effectively had 2 separate injector chambers that were separated by the 3/8" hole that is normally the oriface for the injector spray.
Absolutely amazing. Lesson learned--If you own it, it is your responsibility to check everyone's work. Even a reputable diesel engine machine shop.
When I ran out of other options, I ordered new injectors from Hoye. I figured after 30 years it couldn't hurt to replace them. When they arrived I took out the old and noticed that what I saw inside the injector hole did not look like the pictures on Hoye's website. So after a couple of conversations with Sam (parts guy at Hoye) we realized that the upper injector chamber was installed backwards. I flipped them around, put new insulators and injectors in and she is good as new (I think). Appearently, during part of the inspection or machining process the machine shop removed the injectors and injector chambers and put them in backwards.
How the tractor even ran is beyond me. With the upper chamber in backwards, it effectively had 2 separate injector chambers that were separated by the 3/8" hole that is normally the oriface for the injector spray.
Absolutely amazing. Lesson learned--If you own it, it is your responsibility to check everyone's work. Even a reputable diesel engine machine shop.
204saskman
Gold Member
good to here man. I might do mine once the hour meter hits zero again. Only 300 more hours now and well i guess i rebuild itl.
OP
N8-126
New member
I think this is what they call a saga. I was incorrect when I stated that "she is good a new". Basically, I fooled myself by having just reassembled everything and bleed all the fuel lines. After an hour or two of sitting, she was once again back to her old hard to start self.
I can, with almost 2 weeks of use, attest that now everything is fixed. The basic deal is that if you do a complete engine rebuilt, get your injector pump rebuilt and put in new injectors. After all the confusion, I found a company in Toledo that speciallizes in Yanmar (and other) injectors and injector pumps. What I learned from them is that my story is not that unusual. If the pump and injectors are worn, they can't overcome the cylinder pressure on the upstroke to get the tractor started. Before the rebuild, the rings and sleeves are also worn so the cylinder pressure is reduced (on my tractor this was obvious by the blow-by). As long as both are worn out, no problem. If only the pump and injectors are worn-no starting.
I also wanted to thank everyone on this site. After getting the pump rebuilt, I needed a new timing pin. Several people helped me with photos so that I could make a new one. I also wanted to acknowledge 1danny (http://www.tractorbynet.com/forums/members/1danny.html)-he seems like a good guy with great customer service.
I can, with almost 2 weeks of use, attest that now everything is fixed. The basic deal is that if you do a complete engine rebuilt, get your injector pump rebuilt and put in new injectors. After all the confusion, I found a company in Toledo that speciallizes in Yanmar (and other) injectors and injector pumps. What I learned from them is that my story is not that unusual. If the pump and injectors are worn, they can't overcome the cylinder pressure on the upstroke to get the tractor started. Before the rebuild, the rings and sleeves are also worn so the cylinder pressure is reduced (on my tractor this was obvious by the blow-by). As long as both are worn out, no problem. If only the pump and injectors are worn-no starting.
I also wanted to thank everyone on this site. After getting the pump rebuilt, I needed a new timing pin. Several people helped me with photos so that I could make a new one. I also wanted to acknowledge 1danny (http://www.tractorbynet.com/forums/members/1danny.html)-he seems like a good guy with great customer service.
swedish-fish
Bronze Member
So, what was the cost of new injectors and having the injector pump rebuilt? I've noticed my oil pressure light takes longer to turn off (about 6-7 seconds at 1500 rpm) and it starts a bit harder. There is no black smoke except when starting and under a heavy load.
I've never checked compression. What exactly is involved in an engine and injector pump rebuild?
My hour meter shows 850 hrs and the previous owner says it never rolled over.
I've never checked compression. What exactly is involved in an engine and injector pump rebuild?
My hour meter shows 850 hrs and the previous owner says it never rolled over.
6thgpSF
Gold Member
I had my injectors rebuilt on my 1610D at a 100 bucks apiece .thats with labor.one of them was dumping too much fuel and bent a valve. russ
Raw Dodge
Platinum Member
- Joined
- Apr 8, 2009
- Messages
- 644
- Location
- Orange County,NY
- Tractor
- Ventrac 4231,Dixie Chopper XXWD5000
I have a 3tn84 in my dixie chopper lawn mower. Its had low power all season,its an 05 model.Ive done all the basics,new fuel filter,new transfer pump,fuel pressure checks,repalced air filter,I check the wastegate in the turbo,checked for intake(boost leaks),checked muffler for restrictions.It starts and runs perfectly,however it used to be an animal,its 41.4HP,you could cut a hay field with it before.Now it feels like about 30hp.I also checked RPM,its running at the correct speed(3000 RPM hi idle).There is no blowby out the tube,the engine is tight,ive owned it since new,only 500 hrs on it,and ive changed the air filter/fuel filter oil/filter religously every 100 hrs,after changing it at 25 hrs when new,and again at 75 hrs.
I think the issue lies in the injection pump,as it NEVER smokes,not even a wisp,even under load if i bog it intentionally,it doesnt smoke.Every diesel ive owned would smoke if i lugged it.
My dixie chopper dealer here is stumped,say hes never seen a single problem with the yanmars,no one local knows anything about it.Im thinking the guy in ohio may be able to help me,with winter approaching i can pull the pump and send it out if needed,and afford the down time.I'd like to get back the power it once had.I will be doing an oil sample at the end of this season when i drain this oil out,to rule out an engine problem,but having owned it since day one,Im pretty sure the engine itself is strong.N8-126 if you could pm me with the number of the guy who helped you id appreciate it.
I think the issue lies in the injection pump,as it NEVER smokes,not even a wisp,even under load if i bog it intentionally,it doesnt smoke.Every diesel ive owned would smoke if i lugged it.
My dixie chopper dealer here is stumped,say hes never seen a single problem with the yanmars,no one local knows anything about it.Im thinking the guy in ohio may be able to help me,with winter approaching i can pull the pump and send it out if needed,and afford the down time.I'd like to get back the power it once had.I will be doing an oil sample at the end of this season when i drain this oil out,to rule out an engine problem,but having owned it since day one,Im pretty sure the engine itself is strong.N8-126 if you could pm me with the number of the guy who helped you id appreciate it.
OP
N8-126
New member
The injectors were ~$80 a piece (new) through Hoye. I opted to buy new ones because my neighboor had his rebuilt and it cost him $75 a piece. The pump was rebuilt by International Fuel Systems (www.ifsinternational.com)-ask for Jim. The rebuild cost me about $300, but I don't think that is a fair comparison. My YM155 was used all the time. We had over 3000 hours on it and the injector pump had never been touched. IFS said that they usually only need to replace a few key parts and a typical rebuild is between $100 and $200.
IFS treated me fair and seemed to know what they were talking about. They will take the whole tractor/mower or if you want to remove the parts, they will just fix the parts and mail them back to you.
IFS treated me fair and seemed to know what they were talking about. They will take the whole tractor/mower or if you want to remove the parts, they will just fix the parts and mail them back to you.
