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Old 03-12-2011, 09:38 PM   #1
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Question Missing holes in head gasket .... are they really missing?

Hi guys, … it is not the first time in my automotive practice taking head off ( probably never paid attention before) , but …. took off head today (first time on Saab 9000, 2.3L) and what I see - holes that supposed to be connected in the head and block for coolant flow in most places are missing (please see the photo – I put red circles on some).
What the purpose of THIS? … from my amateur point of view the better coolant flow the healthier engine. As you see on the photo, some holes are very small and some a bit bigger, but the first cylinder is the favorite one – has biggest holes….LOL….. well… it is not a mistake but what and why…..what the purpose of blocking the holes? Blocked holes create huge internal pressure. Saab has reputation of leaking head gasket ... I wonder why? I understand that the first cylinder must have smallest holes and each of the next ones bigger and bigger (the biggest holes must be in fourth cylinder). It is simple principle – the further cylinder from water pump, the bigger holes.
Please need your input to make it clear … thanks in advance for reply.Alex
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Old 03-12-2011, 10:09 PM   #2
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is that the old headgasket?
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Old 03-12-2011, 10:15 PM   #3
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yes, ... the new one is the same....
-------------------------------------------------
THIS IS THE THOUGHT - classic coolant system
" ... On a slant head to block mating surface, there are four main coolant passages from the block to the head. ALL of them are blocked by the head gasket, except the one at the rear of the head/block. This forces coolant from the block to enter the head in the rear, then travel (forward) through the head and out to the radiator. If the forward passages were open, the path of least resistance for the coolant would be right up through the front of the block and head, and back out to the radiator. The rear of the head would basically be bypassed, making it overheat."
---------------------------------------------------
... we have all 4 passages on the first cylinder opened (and further down almost blocked creating hot spots) and coolant goes up in the head in first cylinder... Saab spent $$$ on R&D .... Guys, I am not trying to redesign head gasket..... just need an explanation....

Last edited by alex_nz; 03-12-2011 at 11:12 PM.
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Old 03-13-2011, 03:50 AM   #4
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Perfectly normal for a 9000, that's how they're designed. Here's a link where someone put on a copper gasket.

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Old 03-13-2011, 12:08 PM   #5
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Quote:
Originally Posted by alex_nz View Post
THIS IS THE THOUGHT - classic coolant system
" ... On a slant head to block mating surface, there are four main coolant passages from the block to the head. ALL of them are blocked by the head gasket, except the one at the rear of the head/block. This forces coolant from the block to enter the head in the rear, then travel (forward) through the head and out to the radiator. If the forward passages were open, the path of least resistance for the coolant would be right up through the front of the block and head, and back out to the radiator. The rear of the head would basically be bypassed, making it overheat."



This. Nail on the head.
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Old 03-15-2011, 11:09 PM   #6
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Obviously … you have plenty in your own … mate… drive carefully … don't scratch the roof ... mate
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