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Sealing New Head Gasket


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#1 Sunbeam

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Posted 28 July 2020 - 07:08 PM

I recently watched a utube video where a new engine start was being filmed. The guys ran the engine without coolant fo about twenty seconds to ‘seal ‘ the gasket. Engine was left to cool for a while before coolant was added to continue to run. Is this a normal practice as I haven’t heard of this before.Im building a new 998 engine so I would like your opinions of the best method. Many thanks.

#2 Cooperman

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Posted 28 July 2020 - 07:20 PM

The accepted method is to torque the head down with the new gasket, fill with coolant, start the engine and run it through two complete heat & cool cycles.

Then re-torque by backing off each head nut in turn, in the correct order, and re-torque to the stated figure. Re-set the valve clearances, top-up with coolant and run normally.

Others may do it differently, but it has worked for me since 1961.



#3 cal844

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Posted 28 July 2020 - 07:22 PM

Run the engine with no coolant just enough to let the gasket warm slightly then (double check torque of head nuts) then use water to do a full heat cycle the motor, you may get some slight weeping until the gasket fully seals.

Hope this helps

Cal

#4 Steve220

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Posted 28 July 2020 - 07:55 PM

I recently watched a utube video where a new engine start was being filmed. The guys ran the engine without coolant fo about twenty seconds to ‘seal ‘ the gasket. Engine was left to cool for a while before coolant was added to continue to run. Is this a normal practice as I haven’t heard of this before.Im building a new 998 engine so I would like your opinions of the best method. Many thanks.

Thats the bedding in process for the BK450 gasket.



#5 Moke Spider

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Posted 28 July 2020 - 08:46 PM

It depends on the Gasket and what the manufacturer of the Gasket recommends.

 

Some say Dry, some say fill with clean water (no coolant) for a few heat cycles.

 

Here's ACL's advice;-

 

(Q14 down towards the bottom of the first sheet here)

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#6 Cooper Mac

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Posted 30 July 2020 - 09:58 AM

I recently watched a utube video where a new engine start was being filmed. The guys ran the engine without coolant fo about twenty seconds to ‘seal ‘ the gasket. Engine was left to cool for a while before coolant was added to continue to run. Is this a normal practice as I haven’t heard of this before.Im building a new 998 engine so I would like your opinions of the best method. Many thanks.

I was taught this method years ago, but I think it only works on copper gaskets? I've done this a few times and never had a problem.....






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