7m head gasket

cre · 11-21-2011, 10:03 PM

If you're inclined to ignore the directions of the manufacturer of the fastener then at least look up and follow the industry specs for said fastener when used with those same materials. I believe the spec for the MKIII headbolt size is about or just under 80ft lbs for an elastic application... then you allow for the expansion of the materials it is joining as the engine heat cycles (remember, aluminum expands more rapidly than steel) putting us back down to about 75. It's not just about what the fastener can withstand either, these heads are not as beefy as people seem to think and they're not the best alloy available today. They've got well over 20 years of stress making things even worse. These same rules apply to studs.

87hilux7mge · 11-22-2011, 04:50 AM

thank god someone like CRE is around to put those thoughts together in a fluid explanation...

i really gotta get a grip on things haha.

cre · 11-22-2011, 12:03 PM

Trying to explain some of these things fluidly is just insane... Fasteners are insane. If you look in the thread concerning valve cover grommets you'll find more info... but there's so much more to add still to every side of the equation that I think most people will decide that perhaps they should stop and follow what's written in the book or piece of paper in the box.

suprra_boy · 11-23-2011, 02:00 AM

any ideas for good shops to machine it? cuz around here there is no one that takes pride in it so not very trust worthy

cre · 11-23-2011, 02:18 AM

Machine the head or block? I'd recommend finding somewhere in driving distance. Properly shipping either gets quite costly and I've seen pictures of them coming back with big nasty gouges in what WAS a perfect deck.

You could ask in the regional forum for your area over on SM who the other locals in your area recommend.

suprra_boy · 11-23-2011, 07:33 PM

idk probably both

11-21-2011, 10:03 PM	#1
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If you're inclined to ignore the directions of the manufacturer of the fastener then at least look up and follow the industry specs for said fastener when used with those same materials. I believe the spec for the MKIII headbolt size is about or just under 80ft lbs for an elastic application... then you allow for the expansion of the materials it is joining as the engine heat cycles (remember, aluminum expands more rapidly than steel) putting us back down to about 75. It's not just about what the fastener can withstand either, these heads are not as beefy as people seem to think and they're not the best alloy available today. They've got well over 20 years of stress making things even worse. These same rules apply to studs. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

11-22-2011, 04:50 AM	#2
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	thank god someone like CRE is around to put those thoughts together in a fluid explanation... i really gotta get a grip on things haha. __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

11-22-2011, 12:03 PM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Trying to explain some of these things fluidly is just insane... Fasteners are insane. If you look in the thread concerning valve cover grommets you'll find more info... but there's so much more to add still to every side of the equation that I think most people will decide that perhaps they should stop and follow what's written in the book or piece of paper in the box. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

11-23-2011, 02:18 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Machine the head or block? I'd recommend finding somewhere in driving distance. Properly shipping either gets quite costly and I've seen pictures of them coming back with big nasty gouges in what WAS a perfect deck. You could ask in the regional forum for your area over on SM who the other locals in your area recommend. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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11-23-2011, 02:00 AM	#4
suprra_boy Stock Join Date: Oct 2011 Location: new your Posts: 17	any ideas for good shops to machine it? cuz around here there is no one that takes pride in it so not very trust worthy

11-23-2011, 07:33 PM	#6
suprra_boy Stock Join Date: Oct 2011 Location: new your Posts: 17	idk probably both