Head Gaskets
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From: SunSHine State
Head Gaskets
Im new to this site.... So i thought id ask if anyone has had trouble with head gaskets with your 6.9???
MIne are blown, but the truck is in great shape and it still runs, but i dont run it at all.
It can sit for a long time, then when i go and start it, 30 seconds later it will blow coolant out the rad...
Anyway, just wondering of its common?
MIne are blown, but the truck is in great shape and it still runs, but i dont run it at all.
It can sit for a long time, then when i go and start it, 30 seconds later it will blow coolant out the rad...
Anyway, just wondering of its common?
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
1stsho,
Welcome to FTE and the IDI diesel forum.
On the 6.9 engines, it is rather common for the rear two cylinders to have haed gasket problems.
The most common cause is the CDR not getting serviced and the engine burning ther excess oil getting sucked from the engine in the two back cylinders.
Engine oil has a higher BTU content, so when it burns the cylinder pressures go up that in turn causes the head to lift and head gasket failure is the end result.
Welcome to FTE and the IDI diesel forum.
On the 6.9 engines, it is rather common for the rear two cylinders to have haed gasket problems.
The most common cause is the CDR not getting serviced and the engine burning ther excess oil getting sucked from the engine in the two back cylinders.
Engine oil has a higher BTU content, so when it burns the cylinder pressures go up that in turn causes the head to lift and head gasket failure is the end result.
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Welcome aboard! Sorry I can't help with the CDR definition. I just wanted to let you know that my 6.9L did basically the same thing about 7 years ago. I distinctly remember when picking up the new head gaskets at the Ford dealer that the gaskets were a "revision B" or "Mod X" I asked about this and was told that the gasket had been revised and upgraded by FoMoCo to address known issues. Anyway, while I had the heads off I had them rebuilt and I now have 270k miles on the truck.
Good luck
Good luck
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
CDR = crankcase depression regulator
Mounted on the back of the intake throat with a tube down into the valley pan.
There is a spring and diaphram inside that shuts off the CDR at higher RPM to stop the engine vacuum from sucking engine oil into the intake, which a diesel just burns as more fuel.
Should be serviced every other oil change by soaking in solvent (gasoline) to disolve the oil deposits inside the CDR that will eventually turn to tar and keep the diaphram from moving.
Bluehurricane, Welcome to FTE and the IDI diesel forum.
The only dumb question in this forum is the one you do not ask.
Mounted on the back of the intake throat with a tube down into the valley pan.
There is a spring and diaphram inside that shuts off the CDR at higher RPM to stop the engine vacuum from sucking engine oil into the intake, which a diesel just burns as more fuel.
Should be serviced every other oil change by soaking in solvent (gasoline) to disolve the oil deposits inside the CDR that will eventually turn to tar and keep the diaphram from moving.
Bluehurricane, Welcome to FTE and the IDI diesel forum.
The only dumb question in this forum is the one you do not ask.
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From: SunSHine State
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From: San Diego, CA/ Yuma, AZ
1stsho,
Welcome to FTE and the IDI diesel forum.
The most common cause is the CDR not getting serviced and the engine burning ther excess oil getting sucked from the engine in the two back cylinders.
Engine oil has a higher BTU content, so when it burns the cylinder pressures go up that in turn causes the head to lift and head gasket failure is the end result.
Welcome to FTE and the IDI diesel forum.
The most common cause is the CDR not getting serviced and the engine burning ther excess oil getting sucked from the engine in the two back cylinders.
Engine oil has a higher BTU content, so when it burns the cylinder pressures go up that in turn causes the head to lift and head gasket failure is the end result.
I just had my 94 7.3 apart today, I had my intake off from the turbo and my CDR valve line was just hanging free.
I started the truck and what seemed like alot of smoke came out of the CDR return line, there was also some oil residue on the inside of the turbo when i removed the intake line. with a properly working CDR Valve is it common for some oil to make it through or should this valve eliminate all oil?
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Dave, thanks for the education! Since I have had the truck for 13 years now and have never touched the CDR (or known what one was!) I wonder if I should replace it and then begin normal intervals of cleaning it as you suggested...
I gues it is a testament to the truck's inherint reliability, over the years I have replaced just about every component on the engine due to failure but the engine itself continues to purr like a kitty, no oil burn or leaks. The most miserable job was removing the oil cooler & dissasembly to replace the O-rings...don't want to do that again anytime soon!
Thanks again
I gues it is a testament to the truck's inherint reliability, over the years I have replaced just about every component on the engine due to failure but the engine itself continues to purr like a kitty, no oil burn or leaks. The most miserable job was removing the oil cooler & dissasembly to replace the O-rings...don't want to do that again anytime soon!
Thanks again
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From: woodville, tx
when i checked on prices for a cdr, the stealership had no idea what a cdr was, found the part # on here and they found it, but it was called something like an intake ventalation device or something of the sorts.
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thanks
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From: woodville, tx
depends on your part of the country... joe blow price here is around 70$ some on here have said it was close to 40$ in their neck of the woods. keep in mind when you do go get one you are gonna need new o-rings as well. yours will probably break being many years of heat with no removal.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Adapter for crank case ventilation.
Right now I don't remember if that is the Ford or International label though.
If you have an International or Navistar dealer close by they generally have better prices than Ford does.
Soak in gas, agitate, soak some more, agitate and soak some more.
If the CDR has never been serviced, it may take some time to get the tar disolved, but with persistance it will clean up.
If during the soak and agitate process, you see chunks of black rubber washing out, you need an new CDR.
Never blow compressed air into the CDR or try to clean with a brush inside, the diaphram is thin and will be damaged.
If you blow into the small vent hole with your mouth, when you build a little pressure inside the canister if you stick your finger in the oposite side you should feel the diaphram move some.
When you feel it start moving when you blow in it you are getting close to clean.
Right now I don't remember if that is the Ford or International label though.
If you have an International or Navistar dealer close by they generally have better prices than Ford does.
Soak in gas, agitate, soak some more, agitate and soak some more.
If the CDR has never been serviced, it may take some time to get the tar disolved, but with persistance it will clean up.
If during the soak and agitate process, you see chunks of black rubber washing out, you need an new CDR.
Never blow compressed air into the CDR or try to clean with a brush inside, the diaphram is thin and will be damaged.
If you blow into the small vent hole with your mouth, when you build a little pressure inside the canister if you stick your finger in the oposite side you should feel the diaphram move some.
When you feel it start moving when you blow in it you are getting close to clean.
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From: SunSHine State
Im glad i found this site and section...... Most guys around here only know powerstroke and duramax..... THey say my 6.9 in outdated.... Im like it might be outdated, bt i think its more reliable that the stroke and the max, in my opinion!! LOL
Cheaper to fix...
Cheaper to fix...
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I agree, mine has 270k on it and other than replacing the head gaskets it's just like it came from International Harvester in 1986. The reason I am so dumb about the engine is that it has never broken so I haven't been forced to figure it out!