
02-14-09, 08:37 AM
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| Cadillac Owners Connoisseur Cadillac(s): Member of Air Fuel Tuning (Cadillac Division) | | Join Date: Apr 2007 Location: Inside The Northstar PCM Age: 41 | |
| Re: Root Cause of Head gasket Failure and a Fix? Bad news Guy's
Very Bad News.
The LS1 (11mm X 2.0MM) type Head bolt won't stay in a block made of JUNK!
I see nothing good coming from this discovery. I can honestly say I don't see this being a one time case.
I have a 2004 Seville with about 80k on it that came in last week for a seat heater Element and something else.
It came back this week with the Seat Heater Module out and a Coolant Leak.
I found a Blister in the Side-Wall of the Surge Tank.
Think about how F'ing hot that coolant had to be that contacted the side-wall of the tank to cause a blister!!!!!
I used our "Block Tester" on it and the fluid turned from Blue to Yellow in just a few pumps. 
I pulled the engine and the Head Gaskets looked OK. Nothing showing a MAJOR Gasket Failure. I saw some bunching of the head gasket and some signs of uneven crimping force/torque.
1 head bolt was just slightly little loose. It was a little rusty, but the hole was Dry. I mean Bone Dry. The Rust was not from COOLANT in my opinion. Maybe a wet bolt when installed.
I inspected the Block and ALL 20 bolt holes were JUNK. WTF
The threads were pitted and broken in all 20 holes
My Northstar savior is crumbling before my eyes.
I drilled out the hole that had the slightly loose bolt first and found a good sized void.
The zone rep came out and looked at it. He said lets try a TimeSert. Ok I will play along. I tapped the hole and the void doubled in size. 
Now I had drilled out 2 other hole before the Zone Rep Came out and they both had small holes/voids in the casting. WTF THEY can't figure out how to pour a block you have been doing it since the 60's
I am overly irritated by this.
This is NOT the bad hole. The treads are junk in this one.  
BAD HOLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  
Hey the screen is broke on my camera so it is difficult to take pictures, but I will take some more of the nightmare |