Here we go again. BHG?

[IanC]

Recent history: BHG at around 116k miles. Decked the head, OEM HG, ARP studs, every wear item replaced except the block internals (block was not decked). Everything torqued to spec. It's been less than 500 miles.
Today it overheated, the upper radiator hose was rock hard and the overflow reservoir is still full. I noticed a drip from what looks like the drivers side heater hose on the engine side. Also saw what looks like white residue on the turbo elbow flange where it bolts to the turbo.
Possible causes I can think of:
BHG - obviously all new.(cry)
Radiator cap - also new but replaced a couple days ago.
Thermostat - replaced during HG repair with a fail-safe.
Water pump - also new (not reman) replaced during HG repair
I'll be doing a coolant system pressure test and compression test and will post results but I'm thinking somehow it's BHG again. Just wanted any other thoughts while I'm checking things.

 

[supraguy@aol]

Did you check for coolant in the oil, or oil in the coolant?

 

[IanC]

Saw neither.

 

[MINA]

try this snifer stuff you run the car with radiator cap off..and you use this turkey baster thing with a certain fluid in side and it will change color if it detect exhaust fumes can remember what its called but its out there anyone know

 

[hvyman]

Block test.

also do a compression or leak down test.

Fix the leak first tho. Could just be a air bubble.

 

[IanC]

Block test.

also do a compression or leak down test.

Fix the leak first tho. Could just be a air bubble.

Actually, now that you mention it, I heard some gurgling behind the dash when I took a turn the other day and then completely forgot about it.

 

[IanC]

Did a leakdown test yesterday and it uncovered a couple small pressure leaks at hose clamps and a pin hole sized leak on the turbo coolant feed flange. Everything fixed, bled the system and so far everything is normal.

 

[D.J.T.]

Everything torqued to spec.

.....

 

[IanC]

Everything was torqued according to the TSRM. The flange at the turbo still had a leak small enough that at 1 bar it had tiny foam bubbles. Cleaned the surface, new gasket and re-torque to spec fixed it. As for the clamps it was my first time using silicone hoses and t-bolt clamps so I erred on the side of cautiousness and didn't romp them down.

 

[IndigoMKII]

Everything was torqued according to the TSRM. The flange at the turbo still had a leak small enough that at 1 bar it had tiny foam bubbles. Cleaned the surface, new gasket and re-torque to spec fixed it. As for the clamps it was my first time using silicone hoses and t-bolt clamps so I erred on the side of cautiousness and didn't romp them down.

What spec was used for the head gasket?

 

[IanC]

ARP's spec. 90 ft/lb.

 

[D.J.T.]

ARP's spec. 90 ft/lb.

On Stock Head Bolts?...

 

[IanC]

ARP studs as stated in the original post.

 

[supraguy@aol]

Sounds good so far. Good luck!