oops, I over reved

[Bob Rooks]

My apologies to all who were offended, I meant no harm.
I will enlist sensitivity training at the first opportunity.

"I have 37 diesel engines on my 4870 acre farm."
You could still be a novice if you bought them all yesterday.
Wisdom and experience is gained by longevity and tempered by the occasional failure (in most cases).

 

[EFC]

Have a Dong Feng 354 and was plowing the drive way. Neighbour was stuck so I took off the load and went to help. I had the rpm up to ~2800 for no more than 5 seconds before I noticed it. I heard a pop (kind of like a poof) and then it started to smoke white smoke and loose power. It will start easily and run but I cannot get any measurable power and cannot get rid of the smoke.

Tractor is a diesel and has ~153 hours on it. When it was newer ~75hours I had a similar smoking incident (no overreving and no pop/poof sound) and people on the forum told me to put it under load (1800-2000 rpm) for a number of hours. It worked and it has been great. I tried that and it didn't work.

I added fuel (that had been in a jerry can for a month) that day and had changed the fuel filter at 110 hours.

any suggestions? Is there a governor that needs to be reset?

First off your engine cannot over rev, the governor will kick in before that happens, besides, that same motor was used in gen sets and ran at 3400 RPM continuous.

I might be wrong but I have seen this problem in both the DF254 AND DF354 before. The pop you heard is usually the shaft oring seal blowing out on the hydraulic pump. When that happens hydraulic oil will start pumping into your crankcase. Your hydraulics will continue to work for a while but as your crankcase fills up hydraulic oil gets pushed past the pistons on the down stroke and that is where you get the engine loading at RPM and the heavy white smoke.

Pull your dipstick and see if oil pours out or if it is at the top of the stick. If everything looks normal then it is probably a head gasket.

Buck

 

[AKfish]

Three weeks now and I think everyone has picked up all those loose items that were flying around the room...

But no word from Tractor Nubi... (Gol darnit - I like a good mystery too! Preferably one with an ending.)

AKfish

 

[Bob Rooks]

I am not trying to start an argument, I just want to set the record straight.

First off your engine cannot over rev, the governor will kick in before that happens,
That is simply not true. Diesel engines can and will over-speed, for many reasons.

besides, that same motor was used in gen sets and ran at 3400 RPM continuous.
Depending on the number of poles a generator has, it can only develop 60 Hz at 450 r/m (Coulee Dam, etc.), 900 r/m, 1,800 r/m, and 3,600 r/m.

Your hydraulics will continue to work for a while but as your crankcase fills up hydraulic oil gets pushed past the pistons on the down stroke and that is where you get the engine loading at RPM and the heavy white smoke.
Sorry, white smoke is unburned fuel. White vapor indicates coolant in the combustion chamber (vapor is also a by-product of the combustion process and is seen usually from cool exhaust temps.). Burning hydraulic oil will produce blue smoke.

12345

 

[greg_g]

Burning hydraulic oil will produce blue smoke.

Besides that, everybody else has been helping assist a fuel injection problem.

//greg//

 

[EFC]

12345

1. It is true. His specific engine (not a blanket statement relating to all diesel engines under all circumstances for all time) has a physical stop limiting RPM. Even if the stop is backed all the way out there is not enough room for the fly ball to open up past 3600 RPM. Even if it did figure out a way to evolve past physics the pump is not capable of pumping at a rate past 3600. I know this because of the time I spent in China at the DF facility trying to blow these engines up during the original EPA tests.

2. Glad you know something about generation. I worked as a hydro turbine/generation governor electrician for 15 years at various dams (including from time to time, Grand Coulee)

3. I know that water typically is emitted as white smoke and oil as blue but I have seen the crankcase fill up on dozens of occasions and it almost always shows itself as heavy white smoke. But what do I know I can only speak as a Dong Feng dealer who sold and repaired (and still repair) hundreds of these tractors over the years. All I am asking is that he check to see if the fluid level is normal in the crankcase to rule out something with exactly the same symptoms as I have seen before and costs him nothing to check. Unless this isnt that kind of forum.

In that case my GUESS is that the injection pump was installed upside down at the factory. I would pull it out (with a crow bar) beat on it with a hammer then pull #3 piston (throw it out behind the barn) then paint the tractor purple, point it toward the north star and see if that works..

Buck

 

[Bob Rooks]

....In that case my GUESS is that the injection pump was installed upside down at the factory. I would pull it out (with a crow bar) beat on it with a hammer then pull #3 piston (throw it out behind the barn) then paint the tractor purple, point it toward the north star and see if that works.

I most heartedly agree on that. LOL.
I have witnessed engines exceeding the injection pumps capability; ie; blown compressor-side turbo seals, paint fumes (say, starting fluid), infamous Roots blower seals on Detroit engines, etc.

 

[AKfish]

3. I know that water typically is emitted as white smoke and oil as blue but I have seen the crankcase fill up on dozens of occasions and it almost always shows itself as heavy white smoke. But what do I know I can only speak as a Dong Feng dealer who sold and repaired (and still repair) hundreds of these tractors over the years. All I am asking is that he check to see if the fluid level is normal in the crankcase to rule out something with exactly the same symptoms as I have seen before and costs him nothing to check. Unless this isnt that kind of forum.

In that case my GUESS is that the injection pump was installed upside down at the factory. I would pull it out (with a crow bar) beat on it with a hammer then pull #3 piston (throw it out behind the barn) then paint the tractor purple, point it toward the north star and see if that works..

Buck

Thanks for a good laugh! Funny is always appreciated...

Question about the circumstances of an engine filling up with hydraulic fluid to the point of having the fluid come out the dipstick. Wouldn't that result in catastrophic failure of the engine? As in broken pistons, rods and possibly a busted crank?

I've read about a similar situation with the earlier DuraMax engines with bad injectors that pumped so much raw fuel into the cylinders that the crankcase filled up with diesel fuel! Lot's of stories about "hydrolock" and major engine failure.

Thanks.

AKfish

 

[Diamondpilot]

Been there done that with a Dura-Junk. I had my truck for a whopping 9 months and dumped it like a fat girlfriend for a Ford PowerStroke.

Also had the sister-n-laws Mitsubishi Eclipse do the same thing. Pulled the dipstick and gas came out. Drained the oil/fuel, pulled the spark plugs, cranked it over, put in new oil and she ran fine. Hers was due to a low battery somehow made the injectors stick open. Also had to put a new battery in it.

Chris

 

[EFC]

Thanks for a good laugh! Funny is always appreciated...

Question about the circumstances of an engine filling up with hydraulic fluid to the point of having the fluid come out the dipstick. Wouldn't that result in catastrophic failure of the engine? As in broken pistons, rods and possibly a busted crank?

I've read about a similar situation with the earlier DuraMax engines with bad injectors that pumped so much raw fuel into the cylinders that the crankcase filled up with diesel fuel! Lot's of stories about "hydrolock" and major engine failure.

Thanks.

AKfish

You are exactly right it can do real damage, that is why I asked him to look so we can take tath of the "to do" list.

Buck