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Author Topic: Lombardini fuel in oil  (Read 1672 times)

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Offline soilmover

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Lombardini fuel in oil
« on: March 14, 2014, 03:27:31 PM »
Just a note to those of you running the Lombardini diesel. They had some problems early on with the fuel lines under the valve cover leaking fuel into the oil. We just had the problem and that's the first thing that we checked. After running the engine, pressurizing the fuel lines, checking the O-rings we couldn't find the leak. Come to find it was the fuel pump sealing diaphragm that was leaking at the plunger seal. The pump worked perfectly and we would have never known there was a problem and probably ruined the engine if we hadn't checked the oil ( morning & lunch time).  Hopefully by frequent checking it will save someone else their engine and/or a lot of time finding the problem. We found it by taking the pump off, filling the actuator housing with fuel, plugging the outlet line (injector side) and lightly pressurizing the fuel inlet side. the fuel in the housing will bubble. - Tony 

Offline ladylake

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Re: Lombardini fuel in oil
« Reply #1 on: March 14, 2014, 04:28:41 PM »

 Good job, how much fuel did it put in the oil in 1/2 day.   Steve
Timberking B20 14000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader

Offline soilmover

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Re: Lombardini fuel in oil
« Reply #2 on: March 14, 2014, 04:37:52 PM »
enough that it was running out of the dipstick hole.

Offline GDinMaine

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Re: Lombardini fuel in oil
« Reply #3 on: March 14, 2014, 08:13:45 PM »
That sounds to me, like a large amount of fuel in the oil.  I know someone who had a 1997 Lombardini that gave up the ghost after 2000 hours.  Wonder if it had a similar issue and he never noticed.
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Offline Dave Shepard

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Re: Lombardini fuel in oil
« Reply #4 on: March 14, 2014, 08:54:15 PM »
I always try to check the oil on stuff all the time. We had an IH 756 with the Nuess diesel that would blow the seal in the injector pump and fill the crankcase with oil. You knew it pretty quick, because it would start blowing oil and fuel out the crankcase breather. Turned out to be a bad check valve in the return line in the bottom of the tank.
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Offline giant splinter

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Re: Lombardini fuel in oil
« Reply #5 on: March 14, 2014, 09:16:55 PM »
Fuel Dilution is one of the worst things that can happen to your engine, it does not take much to kill a good engine ....... best policy is check your oil regularly.
roll with it

Offline soilmover

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Re: Lombardini fuel in oil
« Reply #6 on: March 15, 2014, 09:27:54 AM »
Lost an engine in a cat dozer few years back, that's what made me a stickler about checking oil. That was not from fuel in it but small hole worn in the pan ( mud build up in the belly pan). A closer watch would have saved a lot of $ and time.

Offline sawguy21

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Re: Lombardini fuel in oil
« Reply #7 on: March 15, 2014, 12:48:22 PM »
One of my customers had the same problem with a Briggs and Stratton (Daihatsu) diesel. A bad injector was the culprit, I am a little surprised the engine didn't lock up from hydraulic pressure.
old age and treachery will always overcome youth and enthusiasm


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