Toymods Car Club Inc: Tech & Conversions => engine blew after I ........................ ???

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feral4mr2
Forums Junkie

Location:
Bundaberg, Qld.
Registered:
May 2002

Re: engine blew after I ........................ ???	Thu, 08 January 2004 13:38

got this from this site: http://www.supras.com/~riemer/HKS/hksgaskets.html Some SONiC members who have had machine work done to their engine when they installed a metal head gasket have experienced problems with combustion gasses leaking past the head gasket into the coolant jackets or oiling system. The marks from the machine tools can leave a pattern of fine grooves, on the engine cylinder head and deck surfaces. This rough textured surface allows the engines high-pressure combustion gasses to fizz through past the metal gasket. Because this smooth factory finish is very hard to have reproduced by the machine shops around the country several things must be kept in mind when machine work is done to your engineÕs deck and head surfaces. They usually never admit it, but try as they might, many reputable machine shops have major problems obtaining a smooth enough finish to allow the use of a metal shim gasket. The reason for this is that they simply donÕt have good enough equipment, procedures, or technicians to achieve an acceptable finish to provide a tight seal when using a metal head gasket. Unless the shop is familiar with doing work of this caliber, they will not understand why you want a better job than what they have done. I have seen machine finishes bad enough to cause sealing problems when using a stock composite gasket! Because of this area of concern, I would only recommend that the engine block deck only be machined (resurfaced) if there is damage to the deck surface caused by the compression rings of the old head gasket. However, usually you will need to resurface the alloy cylinder head because the compression rings of the stock gasket bite into the alloy surface of the cylinder head. could be something to do with the metal headgasket you used? [Report message to a moderator]

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