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Location:
Lismore, NSW
Registered:
February 2003
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7M & HKS MHG
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Tue, 24 August 2004 09:39
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Story so far...
1.Blocked Oringed - Copper head gasket (Leaked compression into all cylinders)
2.Orings still in place - Toyota HG (No problems, although when stripped motor down to do piston rings noticed that the usual 7M HG problem had started to form at Cyl 5)
Can I remove the orings in the block which will still leave a slight groove and use a HKS MHG?
Also I want to know if you have to get both face's machined to a really good finish? I will be getting the head faced again but to a "Mirror finish" but not sure about the block. I NEED ANSWERS 
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Location:
Adelaide
Registered:
September 2003
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Re: 7M & HKS MHG
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Tue, 24 August 2004 10:44
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Don't know about the O ring saga, but there was some discussion on CS about the need/lack thereof of not "lapping" the block when using a MHG. I posted the link here some time ago, and last time I checked, there were no reports of failures.
I have a spare ACL gasket that will be used, as I don't want to rip the block out to get it decked, but we will see what happens when the boost is upped a little.
Have a search and see what you can find
Cheers
Michael B
Edit : Just found it !!!!
Hi all fellow 7M users,
Just found a thread in SupraMania (US based forum), where they were discussing the merits of fitting a MHG without the much referred to lapping etc , but expoused the careful cleaning and use of "Permatex Brake Quiet" instead of the much referred copper sprays.
http://www.supramania.com/phpBB2/viewtopic.php?p=8 7091#87091
Can any of those that have used the various good gear post any opinions and also part numbers etc of the stuff that is recommended ?
As a fellow 7M-GTE owner in search of more sensible power, I will no doubt at some stage in the future be required to do this , but am all for "being prepared" in advance with any useful info.
I know people have posted with a 'generic' description and brand, eg 'Hylomar Copper Spray', but to ensure that I get the right stuff (baby), a part number would be invaluable.
Personally, loctite has always been my friend, but happy to go with others recommendations and experiences when superior to me (Nods at Ed_MA61, Allan, YelloRolla et al)
Cheers
Michael B
[Updated on: Tue, 24 August 2004 10:48]
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Location:
Melbourne
Registered:
May 2002
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Re: 7M & HKS MHG
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Tue, 24 August 2004 23:50
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no way should it of leaked a stock gasket with o rings!!!! something is VERY wrong! check the ring grove make shure the rings sit level and post pics damn it!!!
Allan
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Location:
Lismore, NSW
Registered:
February 2003
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