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Yet another blown head gasket on an EF :/ 

 

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Posted: Sun Sep 04, 2005 10:54 pm 
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fine you do it your way ill do it mine i was only telling you right way to do the job proberly sorry
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Posted: Sun Sep 04, 2005 11:07 pm 
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Maxxr6 wrote:
fine you do it your way ill do it mine i was only telling you right way to do the job proberly sorry


so who taught you the right way?

the manafacturers? of you just went, hey, i can get an extra half turn on this bolt, tighter must mean better!

 

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Posted: Sun Sep 04, 2005 11:08 pm 
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after a few heads comeing back thought i would try it and low and behold they dont blow anymore, at all
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Posted: Mon Sep 05, 2005 2:22 am 
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Maxxr6 wrote:
after a few heads comeing back thought i would try it and low and behold they dont blow anymore, at all


Obvioulsy you know more than the gasket manufacturers then, and all the people out there who never retorque must just be lucky. But when it comes down to it on a falcon 6cyl (with decent head bolts) you can get away with overtorquing the head, which is what you are doing when you retorque. Actually many ford performance mechanics will overtorque the head bolts on higher performance engines by quite a bit initially, they still dont retorque the head bolts after use but its the same end result.
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Posted: Mon Sep 05, 2005 2:36 am 
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Maxxr6 wrote:
after a few heads comeing back thought i would try it and low and behold they dont blow anymore, at all


wow... if only ford had of thought of that... we wouldn't have every falcon out there with atleast one blown headgasket in its life time................................................ *shakes his head*

 

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Posted: Mon Sep 05, 2005 10:41 am 
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After the head bolt has been torqued to its yield point it streatches and permanantly deforms. If you back it off you will have to replace them or you are setting up for possible breakage. just as bad as blowing another gasket.

 

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Posted: Mon Sep 05, 2005 10:41 am 
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After the head bolt has been torqued to its yield point it streatches and permanantly deforms. If you back it off you will have to replace them or you are setting up for possible breakage. just as bad as blowing another gasket.

 

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Posted: Mon Sep 05, 2005 10:53 pm 
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Maxxr6 wrote:
after a few heads comeing back thought i would try it and low and behold they dont blow anymore, at all



or they just got sick of you and take the car some where els

 

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Posted: Mon Sep 05, 2005 11:51 pm 
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That was my understanding too, that once you loosen a torqued up head bolt you must replace it because they stretch when initially torqued up and cannot be trusted to retain their tension if re-used.
Besides, it's the gasket which is compressing, much more so than the metal can expand from the heat of being run in. Maxxr6, you wouldn't be torquing down stretched head bolts as you would be compressing the gasket a little more after being run in. No?

 

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Posted: Tue Sep 06, 2005 1:01 am 
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I do find alloy headed engines do give head bolts a hard time though...It's not realy the gasget in this case..

 

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Posted: Tue Sep 06, 2005 10:19 pm 
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Maxxr6 wrote:
after a few heads comeing back thought i would try it and low and behold they dont blow anymore, at all


If they come back after you change the head gasket, maybe you're doing something else wrong or your torque wrench needs recalibrating?!!??
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Posted: Wed Sep 07, 2005 12:01 am 
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Vic wrote:
That was my understanding too, that once you loosen a torqued up head bolt you must replace it because they stretch when initially torqued up and cannot be trusted to retain their tension if re-used.
Besides, it's the gasket which is compressing, much more so than the metal can expand from the heat of being run in. Maxxr6, you wouldn't be torquing down stretched head bolts as you would be compressing the gasket a little more after being run in. No?

you make an exelent point.
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Posted: Wed Sep 07, 2005 8:13 pm 
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should have done it right the first time on time :D , clean the block properly, shave the head, head bolts are now au bolts so 35nm, then 120 degrees should be dunky dory! if you have just done it and its leaking just take the rocker cover off and do the head bolts up another 45degs :shock:
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