Gearheads step in

[slngsht]

so I finally won the battle against the exhaust flange bolts and got the head off. As I had suspected, it looks like #6 is the culprit.

 

What concerns me is that I don't see any obvious path in the head, block deck, or the head gasket for coolant to get into the cylinder. I will look more carefully for cracks. Let me know if you guys see anything. the two gasket pics are from both sides.

 

Pics are 3 meg each... sorry...

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2791.jpg

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2792.jpg

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2793.jpg

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2794.jpg

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2795.jpg

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2796.jpg

http://www.usa7s.net/forum/uploads/slngsht/Yukon/CIMG2797.jpg

[locostv8]

FYI Sears has a gun that develops just over 600 ftlb.

 

My Corvair had a heating problem, in about 2 blocks the water temp was pegged. Inspection showed no bubbles in the radiator. I had to get a kit to test for exhaust gasses in radiator, it is a realy good idea if this used to lower the water level a bit. The fluid finally turned yellow the second time around. There was an almost imperceptible track between two cyls. New gaskets and a BIG radiator and it was my dd for 2 years with no further problems.

[bsimon]

Visually, I'd venture a guess that the gasket is sealing properly. Look under the valves for a crack in the intake tract.

 

Also GM vehicles of that vintage are prone to develop a leaky upper to lower intake manifold gasket leak. They usually p155 coolant down the outside of the motor, but occasionally do leak into the inside of the manifold. My 99 Tahoe did this.

 

Just throwing out some ideas here...

[slngsht]

Visually, I'd venture a guess that the gasket is sealing properly. Look under the valves for a crack in the intake tract.

 

Also GM vehicles of that vintage are prone to develop a leaky upper to lower intake manifold gasket leak. They usually p155 coolant down the outside of the motor, but occasionally do leak into the inside of the manifold. My 99 Tahoe did this.

 

Just throwing out some ideas here...

 

That's what I had suspected (hoped for) at first. From what I've read online, the internal leaks usually end up in the oil pan, not the intake port. The intake port on this one was a little bit more wet than the others, but I saw no obvious signs of problems with the intake gasket (which Arya had replaced 15K miles ago).

 

Also, after I removed the intake, I did a leak down test, and this cylinder definitely had a leak. leak down was 60%, and you could hear cooland bubbling, although I'm not quite sure which passage.

[Ian7]

and you could hear cooland bubbling, although I'm not quite sure which passage.

 

maybe put a cooling system pressure tester on the car and look/listen for the leak?

[MHKflyer52]

 

That's what I had suspected (hoped for) at first. From what I've read online, the internal leaks usually end up in the oil pan, not the intake port. The intake port on this one was a little bit more wet than the others, but I saw no obvious signs of problems with the intake gasket (which Arya had replaced 15K miles ago).

 

Also, after I removed the intake, I did a leak down test, and this cylinder definitely had a leak. leak down was 60%, and you could hear cooland bubbling, although I'm not quite sure which passage.

 

Mazda,

 

I feel for you as I have had a very similar problem with my car as you know and saw. Still working the problem out and looking to pull the engine again and rebuild it one more time or just replace it with something else.

 

[BobDrye]

Yodah says "look at 10:00 and you will find the answer on #2796.

 

 

 

 

 

http://www.usa7s.net/ASPNETFORUM/upload/796228652_yes.gif