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Old 12-14-2009, 04:03 PM   post #1 of 31
bjh2915
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Default John Deere 670 Yanmar Engine problems

I just purchase a 670 John Deere with a three cylinder Yanmar Diesel. Just over 5000 hours on it (yes 5000 not 500) there is a hose from the top of the engine (next to the oil filler cap) it vents to the open air at the bottom of the tractor. A lot of fluid is coming out of the hose especially when you kick up the RPMs. I checked the oil dip stick and it is way over the level where it should be. So, my guess is that Diesel is getting into the crank case. This combination is being pushed out that black hose and onto the ground. The filter pet **** was not turned off. Is it possible that the fuel entered through the intake and then settled into the oil pan by leaking past the rings?
I'll look closer, but I'm pretty sure that it is not anti-freeze. This happen to me before on my 20hp Kohler engine. I didn't shut the gas off and it all leaked into and settled in the oil pan.
Diesel starts perfect every time so far.

Thanks in advance

Bill
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Old 12-14-2009, 04:35 PM   post #2 of 31
greenman720
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Default Re: John Deere 670 Yanmar Engine problems

I wouldnt say that is is leaking through the intake. But you say there are 5000 hours on it i would say that you have a bad injector or three. somtimes Injectors can start weeping fule in to your crank and "make oil" and the fluid could be from too much oil in the system or back to the 5000 hours you could be seeing massive blow by and lots of crank pressure. but dont give up on her the 70 series john deeres are my favrote cut.
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Old 12-14-2009, 04:44 PM   post #3 of 31
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Default Re: John Deere 670 Yanmar Engine problems

From what you are seeing the black hose is the crankcase vent and the oil level is way to high which can damage the engine if you are seeing fluid coming out this tube, as it only should be a light amount of smoke out of this tube.

I would drain out the oil diesel mess from the crankcase. I would then refill with a fresh filter and oil and then I would then take the injectors out and have them rebuilt at a diesel repair shop or go online and buy new injectors and install them or have the dealer do the replacement, the dealer is going to run more then doing this repair your self.

It sounds like the o-rings are bad in the injectors and leaking down after shutoff.

In the mean time I would shut off the fuel shut off valve after you are running.

You will even shutting off the fuel shut off valve have some diesel leaking past the injectors into the engine but not as much.

You should consider doing the injectors as soon as possible as they willl not get any better
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Old 12-14-2009, 05:02 PM   post #4 of 31
bjh2915
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Default Re: John Deere 670 Yanmar Engine problems

Good information. Something bothers me. When I brought it home, I checked the dip stick and it looked good (full level). I've been starting and running it once or twice a week (it's pretty cold around here, and I want to see if the diesel would start or not) it always started. Now I checked it and it's way over the line.
I'll start with the injectors and shutting off the fuel always. I'll drain everything first and reload it.
I guess I'll take it from there.
Can I just purchase three new injectors, or is this thing so old that I won't find them?

Bill
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Old 12-14-2009, 05:18 PM   post #5 of 31
greenman720
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Default Re: John Deere 670 Yanmar Engine problems

A 670 is not that old any JD dealership can provide you with those injectors. Even thou i would see about rebuilding them first if possible it is usually much cheaper
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Old 12-14-2009, 05:27 PM   post #6 of 31
bjh2915
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Default Re: John Deere 670 Yanmar Engine problems

this 670 is probably from 1987. I was used to cut grass on a golf course.

Everything works - So, I'm in it for the long run.

Thanks

Bill
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Old 12-14-2009, 06:27 PM   post #7 of 31
bjh2915
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Default Re: John Deere 670 Yanmar Engine problems

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Originally Posted by greenman720 View Post
A 670 is not that old any JD dealership can provide you with those injectors. Even thou i would see about rebuilding them first if possible it is usually much cheaper
Well guess what, my Local John Deere dealer says, can't provide.

Only a few parts left like a Starter.

I'm having a big time problem finding parts for this Deere.

Bill
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Old 12-14-2009, 06:56 PM   post #8 of 31
greenman720
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Default Re: John Deere 670 Yanmar Engine problems

If you dont mind can you give my your engine and tractor # I want to talk to a couple people on this.
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Old 12-14-2009, 08:05 PM   post #9 of 31
bjh2915
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Default Re: John Deere 670 Yanmar Engine problems

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If you dont mind can you give my your engine and tractor # I want to talk to a couple people on this.
Absolutely, I'll go out tomorrow and get it.

Some else thought that it might be the diaphram on the fuel pump. Diesel could get through there, but I'd thought that it would starve the injector pump if that was the leak?

I'm lost right now. I will change oil, filters, etc... but I think that the fuel is just going to enter again, where ever it's getting in.

Bill
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Old 12-14-2009, 08:58 PM   post #10 of 31
rscurtis
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Default Re: John Deere 670 Yanmar Engine problems

Injectors will not leak fuel into the engine like a carburetor can. My bet would be with the fuel lift pump mounted on the side of the injection pump. An injection pump or injectors leaking that much fuel would result in a tractor running so poorly you wouldn't be able to use it.
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Old 12-14-2009, 09:05 PM   post #11 of 31
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Default Re: John Deere 670 Yanmar Engine problems

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Originally Posted by rscurtis View Post
Injectors will not leak fuel into the engine like a carburetor can. My bet would be with the fuel lift pump mounted on the side of the injection pump. An injection pump or injectors leaking that much fuel would result in a tractor running so poorly you wouldn't be able to use it.
I agree except the pump might leak without symptoms while running. My older Yanmar engine on my JD F935 uses an electric fuel pump. If this has electric, then likely the injector pump.
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Old 12-15-2009, 07:23 AM   post #12 of 31
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Default Re: John Deere 670 Yanmar Engine problems

We used to have a 1960 Ford 851 diesel on the farm, and it developed the symptoms you're describing. It turned out that the fuel was leaking into the crankcase through the injector pump, and the pump had to be rebuilt ($$$).

Prior to the rebuild, we installed a fuel shut-off valve, and that slowed the problem substantially, but the fuel still leaked by when the engine was running.

Good luck with your problem, and when you get it fixed, give us an update?
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Old 12-15-2009, 11:16 AM   post #13 of 31
bjh2915
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Default Re: John Deere 670 Yanmar Engine problems

This is a great place to bounce things around.

I can't see how the injector would cause this problem. It's a mechanical lift pump. My intention is to remove the pump, block the hole and replace it with an electric fuel pump.
This would only leave the injector pump and injectors.

I suppose there is alway the possibility that I got a hole in the gas tank that leads directly into the block. That's a joke guys.

My guess right now. Diaphram in the lift pump.

How many votes?

Bill
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Old 12-17-2009, 11:52 AM   post #14 of 31
bjh2915
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Default Re: John Deere 670 Yanmar Engine problems

Quote:
Originally Posted by greenman720 View Post
If you dont mind can you give my your engine and tractor # I want to talk to a couple people on this.
I tried a different dealer (John Deere) and got a totally different response.

A good response. I have the injectors and a fuel pump on order. Thanks

Bill
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Old 12-17-2009, 12:18 PM   post #15 of 31
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Default Re: John Deere 670 Yanmar Engine problems

Quote:
Originally Posted by bjh2915 View Post
I tried a different dealer (John Deere) and got a totally different response.

A good response. I have the injectors and a fuel pump on order. Thanks

Bill
Good news. The 670 wasn't a popular model (a little light on the hp) and was dropped, but I can't imagine Deere phasing out parts this soon.
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