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does au head gasket need any sealer 

 

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 Post subject: does au head gasket need any sealer
Posted: Fri Feb 08, 2008 7:54 pm 
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Do au head gaskets just bolt straight on or do you need to coat them in gasket spray like copper ones.First time ive had anything to do with steel gaskets. :?

 

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Posted: Fri Feb 08, 2008 8:18 pm 
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No there is a coating on there already.

 

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Posted: Fri Feb 08, 2008 8:22 pm 
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use hylomar spray on the gasket, even though its coated, and do not run coolant (only straight water) for the first few days / week
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Posted: Sat Feb 09, 2008 12:45 am 
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thanks for the replies,is hylomar spray like a gasket spray? and where do you get it?

 

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Posted: Sat Feb 09, 2008 7:02 am 
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You get it from repco, bursons or mybe at supercheap auto's.
I will like to know if you need to retension the head after a week or so ?

 

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Posted: Sat Feb 09, 2008 9:33 pm 
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Thanks again i got it sorted today,i hope you dont need to retension the head bolts coz i cant be fu@@@d pulling it apart again!!!!!!!! :x :(

 

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Posted: Sat Feb 09, 2008 9:39 pm 
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no need to retension head and i presume you used new head bolts,there yield bolts they stretch
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Posted: Sat Feb 09, 2008 9:45 pm 
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Yep new bolts,used the hylomar spray also.Cool no retensioning. Cheers

 

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Posted: Sun Feb 10, 2008 10:48 am 
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I don't know were you guys get your information from new bolts new gasket. New bolts stretch, new gasket will thin out but steel gaskets don't thin out because the steel gaskets are pre pressed. I think with a steel gasket when the new head bolts stretch will it still seal properly i don't know because i have never used a steel gasket but will use one with the new ported head soon that's what i like to know.

 

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Posted: Sun Feb 10, 2008 11:43 am 
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the bolts are TTY bolts, they really can only be used once, unlike the older motors where you could reuse the bolts over and over. Thats why you need a degree wheel to 'tension' the bolts. New bolts will stretch slightly, but this is taken into account when tensioning (ie 90 degrees). Old bolts can stretch more to the point they will snap.
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Posted: Sun Feb 10, 2008 8:20 pm 
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A lot of the old school donks had tin head gaskets. They used to use "Silver Frost" paint to seal them. These were still used in the 70's.

 

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Posted: Mon Feb 11, 2008 11:33 am 
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and they still use them on motor bikes .with steel gaskets coated in silver frost. ive done a few four stroke head gaskets and used the old ones and coated them in silver frost with no problems.
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