Update on 656 Fire

LaurenceA · Dec 23, 2014

Last month I posted a message about my IH656 catching on fire. Today we discovered that the crankcase was overfilled with a lot of gas mixed in with the oil. Doesn't make sense how the gas got in there. First thoughts that someone sabotaged it. The tractor sits in a barn where we are away months at a time. Are we being paranoid or is there another way gas could find its way into the crankcase on its own? The fire appears to have poured our burning oil-gas mixture into the gravel drive below the crankcase vent on the left side.

jth88 · Dec 23, 2014

If your carb float goes bad or out of adjustment it can fill motor up with gas.

Donald in MN · Dec 23, 2014

the same thing happended to my dads 504 a few years ago . his tractor also sits for a long time with out being used .his crank case was so full it wouldnt start the needle valve leaked gas filling up the manifold and running past an open intake valve into one of the cylinders down past the rings into the crank case . i guess the lesson here is turn off the gas if it sits for a long time

Cory Schmidt · Dec 23, 2014

To me that sound like sabotage straight up. To have that much fuel in the oil (that the mix runs out of the vent) It has to be dumped in. If it was fuel mix extremely rich at the carb it wouldn't run. or not long enough to push the fuel past, rings/ valves. If the fuel leaked when not running it would be like any other fluid going to lowest point at leak (fuel bowl/ carb) ............. Post this on ih/ farmall page they can tell you more about any faults that might get fuel in oil, but it sounds like bad neighbors.

john in la · Dec 23, 2014

This happens all the time with gravity feed carburetors.

Your needle valve or float in the carburetor is the problem.

Turn off the gas when leaving any carburetor motor for extended periods.
Heck turn off the diesel also as injector pumps are know to leak with a bad o-ring.

Steve@Advance · Dec 23, 2014

That is a strange occurrence with an updraft carb. Even with the carb leaking past the seat, the fuel should only go out on the ground, not into the engine. Only if the choke were pulled and the choke plate sealed perfectly could fuel back up high enough to enter the engine.

Does this tractor have a mechanical fuel pump? If so it can leak into the engine.

For the engine to fill with fuel while running it would have been running noticeably bad, black smoke, loss of power, gas smell.

sammydwm · Dec 24, 2014

Sticky needle valves or bad floats can allow gas to continue to flow and the air cleaner is pretty high on the 656. Gas could accumulate enough to trickle into the engine. The fuel shutoff solenoid should have prevented that.

As mentioned earlier though, most times the gas ends up on the ground under the carb.

oldtanker · Dec 24, 2014

Actually if the air filter and any part gas tank are higher than the valve train it's very possible for the crankcase to become full of gas. That means as long as on a tractor like the 656 gas has fuel in the tank anything in the tank higher than the valves can wind up in the engine.

Think about it. As high as gas has been why would someone waste gas by filling up a crankcase when they could put it in their own gas tank?

Rick

NEKS · Dec 24, 2014

Happened on my 450 Farmall a few days ago. Fill number 4 cylinder with gas. Only set a day. Engine wouldn't crank and didn't know why. Just pulled oil plug yesterday to change oil. It was over full.

Sprint 6 · Dec 24, 2014

I had a 300 Utility hydrolock on gas in less than an hour while I was working on it. Customer did not warn me it had carb issues, was not in for that. It left with a rebuilt carb, too.

Cory Schmidt · Dec 24, 2014

I thought about that last night when I went to bed. If everything is sealed good (so it can't leak pass carb/connections) the passage ways would work like a fluid/tube level, but falling down once inside engine.

DaninKansas · Dec 24, 2014

I don't understand your comment on the choke. A 656 has a 33 gallon fuel tank and the air intake is higher than the engine manifold. Gas leaking by the fuel shut off solenoid goes to the engine before it would get to the air filter. If the hose running from the carb to the airfilter leaks - yes it will run onto the ground. But if its in good shape the gas will run part way up the hose but start draining into the engine before it gets to the air filter.

Owen Aaland · Dec 24, 2014

The fuel shut off solenoid only closes off fuel from the main jet. If the needle and seat leak, the fuel will flood the bowl and go out the bowl vent into the air intake side of the carburetor.

PJH · Dec 24, 2014

I bought a JD 420 once that someone had made a knife slit in the bottom of the rubber air intake hose. You couldn't see the slit until you squeezed the hose. I guess they'd had leaky float needle troubles, and slit the hose so it would drip out on the ground, rather than into the crankcase.

3000OH · Dec 25, 2014

Good question about mech fuel pump. I don't know red, only blue, but our 3000's mech fuel pump seal failed & filled the crankcase with gas. Was lucky no fire happened.

Update on 656 Fire

LaurenceA

New User

jth88

Member

Donald in MN

Member

Cory Schmidt

Well-known Member

john in la

Well-known Member

Steve@Advance

Well-known Member

sammydwm

Member

oldtanker

Well-known Member

NEKS

Well-known Member

Sprint 6

Well-known Member

Cory Schmidt

Well-known Member

DaninKansas

Member

Owen Aaland

Well-known Member

PJH

Well-known Member

3000OH

Member

Similar threads