Hey Bern head is off 7710

fordforce

Member
I posted last week that my 7710 started pushing smoke out the crankcase vent tube. I took the head off today. Im no expert, cant really see anything wrong. One thing, the injectors are
dirty sooty. So is the area around the valves. Im thinking i will need new injectors.
Maybe the injector pump should also be sent in and rebuilt.
Can you see anything in these pics?


cvphoto2944.jpg


cvphoto2945.jpg


This is what the valves look like. Appears to be some black soot around intake valve.

cvphoto2946.jpg


Nothing really jumps out at me.
Cylinder no 3 has what looks like honing scratches on it

cvphoto2947.jpg


These cylinders look like they have been bored and relined.
Not sure tho
 
The soot is completely normal.

You indicated in your last post that it seemed to be running on 3 1/2 cylinders and that it was not running smoothly. This is why I thought cracked piston. Myself, I would have done a compression test before removing the head to isolate which cylinder was low. Was the blowby pulsing when the engine was running?

Usually when you have water getting into the cylinders, it tends to wipe the carbon clean. I see no evidence of that. Inspect the tops of the pistons carefully for any hairline cracks.

I see what appears to be a little distress in the head gasket area between #1 & 2 cylinders, however I can't tell for sure if it is a problem or not from the angle. I will say two things about that however: 1) Head gasket failures like that are very rare on those vintage of Fords, and 2) even if that gasket was blown between two cylinders, it would not be the cause for excessive blowby.
 
Hey Bern,the smoke/steam was not pulsating.Just coming out steady.
It shows not so clearly in the first pic.
Thx for replying Bern.
 
I don t think I would have torn it down for that much vapor coming out the vent without more investigation.

Compression test for one. That much vapor coming out the breather reminds of engines that have coolant in the crank case. Any weird slime under the valve cover?
 

Did you check the condition of the turbo? Should be very little side to side movement from the impeller shaft and not in or out movement, if the turbo's bad you could have been loosing boost into the crankcase.
If the engine wasn't loosing water or oil I wouldn't have torn it apart.
 
Fill each Cylinder with diesel and see if one loses fuel faster than the others. I am a firm believer in having injectors checked or changed every 1000 hours.
 

True that's a no boost condition but when the engine is running the turbo is moving a good amount of air, when working on my 5.9 Cummins I disconnected the intake from the inner cooler and noticed a reduced amount of noticeable vapors moving from the vent tube, a short time later we rebuilt the turbo. Weather the addition vapors where leaking past the turbo seals or a addition amount was leaking pass the rings IDK.
The noticeable vapors moving from a engines vent pipe is a combination for hot air coming from the engine mixing with cooler outside air, the amount of moisture in each determines the about of noticeable vapors seen, it's that simple and I know I don't need to preach to you about that, just saying it in general for others that read this.

I've seen worn out engines with major blow by with hardly any vapor, my 4000SU with less than 500 hrs since full rebuild recently had vapors coming from the vent so bad that at first glance I thought it was on fire. It was a cool damp day and though no hot engine temps were high due to the radiator being plugged with feathers and dust from working in our poultry barns. Cleaned the radiator, engine temp dropped back to normal and noticeable vapor nearly disappeared, but I doubt the amount of actual blow by changed at all.

My philosophy is if I see what looks to be above normal noticeable vapors coming from the vent tube check the temperature gauge, if it's warmer than normal check to see if the radiator needs cleaned, beyond that if it's not loosing coolant, oil or making a odd noise keep using it.
You can't fix what ain't broke, but I've seen some that will keep working on something till it is broke.
 
Destroked 450, you hit the nail on the head.
The seal went out in the turbo.
I seen the oily intake manifold and some oil in the turbo charger, but im such a newbie, i didnt join the dots.
Its all good. Head and turbo going into shop to get rebuilt.
Should be good to go shortly.
Thx for your useful tips.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top