FORD 3000 gas still running on two cylinders

ferrarifarms84 · May 19, 2016

I have50 psi compression on number 2 cylinder,it wont fire but plug has good spark.. the other two are fine.. i pulled plug andlet it soak for about a week in auto trans fluid, hoping to free a stuck piston ring,i dont know what else it could be? i got imatient tonight and needed to brushog, so i put the plug back in after blowing out the oil and ran the nnalert out of it for over an hour, still runs the same. it almost acts like it want to fire sometimes but it wont, just pops on two. So i backed it in the shop and pulled the plug out again, this time mixing diesel fuel,kroil penetrating oil,and trans fluid and filled up the cylinder again... im going to let it sit a while and try it again.... am i waisting my time doing this? has anyone had luck freeing up stuck rings before? should i just pull the head and fix it? im trying to do all the simple things first but no luck so far!

RodinNS · May 19, 2016

Did you do a wet comp test? Drop a couple tablespoons of oil down the bad hole and test it again. If comp rises then you have ring problems. If it doesn't rise you have valve or head gasket issues. Either are possible.... and perhaps probable given the numbers you have. If it was me I probably wouldn't screw around with it too long before pulling the head.

Rod

Ultradog MN · May 20, 2016

How much oil did you pour down the sp hole?
Those gas pistons have a very deep dish in the top. It takes at least a cup, probably more like 10 oz to get the oil to spill over the dish and onto the rings. I would dump a cup and a half in it.
I still secretly believe MMO works better than anything else for freeing stuck rings.
Have you pulled the valve cover and checked for a bent push rod? It's possible you had a stuck valve and bent one. Keep in mind those are interference engines so a stuck valve would have gotten pushed back into place so it would look normal. But it might be stuck a few thousandths open and cause you lose compression and not be obvious.

gears · May 20, 2016

Mine was doing the same thing. Fresh rebuild too. Turned out #3 wire was burnt at the boot (pinhole) causing it to erratically run on 2 cyls. New wire set and all is good - fires right up, runs smooth!

ferrarifarms84 · May 20, 2016

i didnt know the pistons were cupped that much,wow! I poured probably 10-12 ounces in there, but i will pour a little more tomorrow just to be safe... i did have the valve cover off and running and couldnt see anything out of whack... i mixed atf with diesel fuel and a little kroil.Not to sound dumb,but whats MMO? THANKS for advice!

ferrarifarms84 · May 20, 2016

Yes, i did a wet compression test... compression went way up with fluid in cylinder so that tells me its a ring.. I think this tractor sat around alot for the past 15-20 years, so it could be why...I think i might just have to take your advice and pull the head if soaking it in oil doesnt work... thanks for the info

RodinNS · May 20, 2016

I wouldn't spend any more time testing it then. That told you your answer... Only other thing I can say is to try some 'combustion chamber cleaner' I use... I think Kleen Flo stuff that I get at NAPA but I've also used the MOPAR variety in the past with equal result. If there is anything that will free a stuck ring, this stuff will. Anything rust related.... usually comes loose. A guy I know freed a 350 small block that was stuck solid using the Mopar stuff. Freed in 4 hours. The acetone in these products will eat the arse oil out of a skunk...

Rod

Destroked 450 · May 21, 2016

MMO= Marvel Mystery Oil

Tall T · May 21, 2016

I use a bent tube like a brake line in the plug hole so that whatever I spray into a cylinder goes straight onto the cylinder walls not onto a pool on the piston top. You get straight to the rings that way and don't get any combustion chamber fouling for obvious reasons.

I wouldn't dare say what fluid I use now.

I've also used what used to be called "Autopar Exhaust Heat Control Valve Penetrating Fluid" . . . bought a quart can of it years ago from a Chrysler dealership. Last I saw it was under the Mopar name, in a black spray can and just called penetrating fluid I think.

Wicked stuff that requires a good solvent oil chaser afterwards especially if left on long. Great for a rust soak bath for nuts and bolts etc. A big brass buckle I left in it looked like it had been glass bead cleaned a day later.

Stuff I use now requires no oil chaser because the oil is in the mix.

FORD 3000 gas still running on two cylinders

ferrarifarms84

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RodinNS

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Ultradog MN

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gears

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ferrarifarms84

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ferrarifarms84

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RodinNS

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Destroked 450

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Tall T

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