head gasket
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Freshman User
Joined: Feb 2001
Posts: 26
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From: Calgary
head gasket
Hey guys, I think my head or head gasket is shot. I cant see to keep my antifreeze in. I've topped it up twice and always seem to boil over even though the temp stays in the normal range. I've changed the rad cap with a 14 psi, then I repaced the therostat. Still "boiling" over. Someone told me it could be combustion gasses leaking into the cooling system. The antifreeze resevoir is always pissing out air and coolant. Any andvice would be appreciated. Thanks in advance.
Drive it 'till you kill it
82 F250 4x4 Lariat 6.9 diesel
85 F250 4x4 Lariat 6.9 ATS TD supercab LWB
Drive it 'till you kill it
82 F250 4x4 Lariat 6.9 diesel
85 F250 4x4 Lariat 6.9 ATS TD supercab LWB
More Turbo
Joined: Nov 2000
Posts: 715
Likes: 11
From: Erie, PA
head gasket
You need to remove all of the glowplugs and get a pressure tester, pump up the system to 15lbs, and then see if you can hear any air or water leaking into the cylinders.
You could also take the radiator cap off and look for exhaust coming out. I hope it is the head gasket and not cavitation. If it is cavitation, this will be the first 6.9 that I have heard of that it has happened to. If you need help doin the head gaskets, email me. I just got done doing the whole top end 2 months ago.
1986 F-250 6.9 diesel,4x4,XLT Lariat,Ex Cab, 8'bed,etc...
You could also take the radiator cap off and look for exhaust coming out. I hope it is the head gasket and not cavitation. If it is cavitation, this will be the first 6.9 that I have heard of that it has happened to. If you need help doin the head gaskets, email me. I just got done doing the whole top end 2 months ago.
1986 F-250 6.9 diesel,4x4,XLT Lariat,Ex Cab, 8'bed,etc...
Senior User
Joined: Jun 2001
Posts: 295
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From: Fort Wayne, IN. USA
head gasket
Oh man... sorry about your situation. Let's hope it's just the head gasket, diesels suffer from cavitation, which is where the cylinder walls deteriorate. This has happened to me in the past. Had to get her bored and sleeved. I had coolant in the oil, and oil in the coolant when I found out about this common problem. The pressure test should lead you in the correct direction. I would pull the heads, turn the motor over by hand and have a close look at the walls.
1991 F350 CC Dually 7.3l, E40D, Soup bowl removed, K&N
1991 F350 CC Dually 7.3l, E40D, Soup bowl removed, K&N
New User
Joined: Aug 2001
Posts: 11
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head gasket
[font size="1" color="#FF0000"]LAST EDITED ON 23-Aug-01 AT 03:32 AM (EST)[/font][p]The 6.9s were known for head gasket problems, and thus they designed the 7.3 with bigger head bolts. 
If there is some blackish looking grit floating around your cooling system, and bubbles when it's been running for a while, then you may be doing your heads. If you do pressurize the cooling system and take your glow plugs out, then leave it for a while, then crank it, you may be able to tell which hole it is by some coolant spray from the glow hole.
But I must say, sure sounds like the head gaskets.
You may also be in for having the head milled a bit as when the gaskets start to work back and forth before they leak, they wear into the head.
Good luck!
STAX
"Duct tape is like the force, it has a dark side, a light side, and holds the universe together!"
If there is some blackish looking grit floating around your cooling system, and bubbles when it's been running for a while, then you may be doing your heads. If you do pressurize the cooling system and take your glow plugs out, then leave it for a while, then crank it, you may be able to tell which hole it is by some coolant spray from the glow hole.
But I must say, sure sounds like the head gaskets.
You may also be in for having the head milled a bit as when the gaskets start to work back and forth before they leak, they wear into the head.
Good luck!
STAX
"Duct tape is like the force, it has a dark side, a light side, and holds the universe together!"
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