Ford 6610 intake manifold carbon

mikewood869 · Jan 4, 2021

What would create all that carbon in the intake manifold? The other ports are clean. Could the thermostart cause that? In almost the five year that we had the tractor, the thermostart never worked. The exhaust manifold seems good, but has oil behind the gasket.

Bern · Jan 4, 2021

Exhaust port for #3 cylinder looks nice and dry. That would seem to rule out a cylinder issue. About the only other thing I
could think of is a faulty valve stem seal on the #3 intake valve.

I can't see the thermostart causing this. Even if it was, it would be affecting the rear cylinder and not a middle one.

mikewood869 · Jan 4, 2021

(quoted from post at 10:28:39 01/04/21) Exhaust port for #3 cylinder looks nice and dry. That would seem to rule out a cylinder issue. About the only other thing I
could think of is a faulty valve stem seal on the #3 intake valve.

I can't see the thermostart causing this. Even if it was, it would be affecting the rear cylinder and not a middle one.

Do you think that could cause the use of antifreeze and compression in the radiator?

Bern · Jan 4, 2021

I doubt it. Water in a cylinder usually wipes carbon away, not produce it.

Compression in the radiator is a rare event on those engines. Make sure you're not imagining things.

sotxbill · Jan 4, 2021

This is what an cooled egr does to the intake manifold on many newer diesels... by recycling exhaust into the intake manifold, it slowly clogs all the ports up... ie vw diesels.. since you only have one port....

first thought is, a bad intake valve, bad valve guide or umbrella seal on the ford tractor... or a non opening exhaust valve meaning its spitting back into the intake...

a dribbling thermostart would foul the intake closest too itself and probably foul the next runner, in line, a bit less.

mikewood869 · Jan 4, 2021

(quoted from post at 15:45:18 01/04/21) I doubt it. Water in a cylinder usually wipes carbon away, not produce it.

Compression in the radiator is a rare event on those engines. Make sure you're not imagining things.

What would cause that (the video link)? That is how full the jug is from driving for 20 minutes at pto speed (1,8xxx). The jug started to fill 5 minutes after I started driving. The tractors temp gauge didn't move. It was 30 outside and I didnt think the tractor could get to temp that fast. It seems if the temp sensor (on the head) was bad, the gauge on the tach cluster, would be pointing all the way up (above the top black line, as far as it could go), when the temp sensor is plugged in, the gauge is on the first black line. The cylinder walls seem good, but I need to look in that further.
https://www.youtube.com/watch?v=2PIsoi_fabk

sotxbill · Jan 5, 2021

wow...assuming thats the overflow line from the radiator???? dont see oil in the red looking antifreeze??????

thats a LOT of compression leaking out and into the water jacket. back to basics...

first choice
a blown head gasket if your lucky.

damage head/ warped or cracked
have head check for flatness and magnafluxed for cracks if it passes a visual inspection.

cracked block or damaged block.

Is there any great amount of blow by coming out of the valve cover vent???

Ford 6610 intake manifold carbon

mikewood869

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Bern

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mikewood869

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Bern

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sotxbill

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