Is new head gasket a must?

scruffboy · 09-26-2005, 01:29 PM

I have an 89 Supra non-turbo with 125,000 miles on it. The engine runs great. I've had no problems. I see a lot of people recommend changing the hg. Why? This seems like a rather expensive endeavor if you are not having major engine trouble. Isn't the hg rather hard to get to? Whats involved? How about valve cover gaskets? Are there two seperate gaskets or is it one large one? Can this be done by a weekend warrior? Any help would be much appreciated.

Thanks,

James

SupraMan1784 · 09-26-2005, 03:16 PM

scruffboy, if you plan to drive your car hard or for a long time, the headgasket is a good investment to put some money into, the factory gaskets are pieces of s**t, trust us on that, it would be a good idea to replace it, its not that hard, but you will need to torque the bolts to the correct amount, i think its somwhere on this forum ive seen it a bunch of times but i dont remember it off the top of my head, you basically need the new gasket and a torque wrench, or any kind of wrench, and this could be easily done in a day...well half a day i say

monkihead · 09-26-2005, 08:17 PM

on a non-turbo, i dont think its as necessary. its a long and fun job(sarcasm) that everyone should enjoy with 100 degree weather.

suprra_girl · 09-27-2005, 10:11 AM

the reason the hg is a must is because.........

from the factory toyota neglected to torque the headbolts to the correct value
so they only torqued to 58ft lbs where they actually need 72ft lbs

depending on power output you want you can stay with the stock hg or upgrade to a metal head gasket
if you just wanna do the 12psi, exhaust, intake thing you should be fine (on a new hg)
for high boost/power applications a mhg is recommended (hks or cometic)

basically... the original torque setting is the failure on the 7m (it's a very capable motor)

7mges also blow hg's... just take a little longer hehe

lethalwithasupra · 09-27-2005, 11:46 AM

what appeared to be a metal head gasket ( a thick metal gasket between two thin gaskets, held together by 4 rivets ) came out of my supra. mostly it was the corrosion and overheating, but one of the thin layers was cracked between bores 5 & 6. 3 & 4 loooked like they were just about ta go thru as well. is a mhg really the end-all ?

understanding that my car is about as well taken care of as you'd expect ...

suprra_girl · 09-27-2005, 12:35 PM

have you put it back together yet?

can you take pics of the block and head surfaces (clean preferably)

lethalwithasupra · 09-28-2005, 08:14 AM

me ? yea its together, and the boss might have thrown the gasket out. i was going to frame it and the one i crimped when it went together the first time and hang them both on my wall.

suprra_girl · 09-28-2005, 12:11 PM

i would say machining was not up to scratch for the mhg

just at a guess

lethalwithasupra · 09-30-2005, 08:14 AM

half the gaskets on the manifolds were so old they splintered taking them off. don't know if thats a good thing but when i saw it i smiled.

65 alright as a torque setting ? 58 was recomended, so we went a little higher.

SupraMan1784 · 09-30-2005, 12:51 PM

thats a badd thing if they splintered coming off...they musta taken a beating over the years

09-26-2005, 01:29 PM	#1
scruffboy walbro fp Join Date: Sep 2005 Location: Kearny, New Jersey, USA Posts: 427	Is new head gasket a must? I have an 89 Supra non-turbo with 125,000 miles on it. The engine runs great. I've had no problems. I see a lot of people recommend changing the hg. Why? This seems like a rather expensive endeavor if you are not having major engine trouble. Isn't the hg rather hard to get to? Whats involved? How about valve cover gaskets? Are there two seperate gaskets or is it one large one? Can this be done by a weekend warrior? Any help would be much appreciated. Thanks, James

09-26-2005, 03:16 PM	#2
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	scruffboy, if you plan to drive your car hard or for a long time, the headgasket is a good investment to put some money into, the factory gaskets are pieces of s*t, trust us on that, it would be a good idea to replace it, its not that hard, but you will need to torque the bolts to the correct amount, i think its somwhere on this forum ive seen it a bunch of times but i dont remember it off the top of my head, you basically need the new gasket and a torque wrench, or any kind of wrench, and this could be easily done in a day...well half a day i say __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ftlbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

09-26-2005, 08:17 PM	#3
monkihead SP58GT Join Date: Mar 2005 Location: San Antonio texas Posts: 646	on a non-turbo, i dont think its as necessary. its a long and fun job(sarcasm) that everyone should enjoy with 100 degree weather. __________________ ....all you need is a small taste of success and you will find it suits you.... monique- better off dead

09-27-2005, 10:11 AM	#4
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	the reason the hg is a must is because......... from the factory toyota neglected to torque the headbolts to the correct value so they only torqued to 58ft lbs where they actually need 72ft lbs depending on power output you want you can stay with the stock hg or upgrade to a metal head gasket if you just wanna do the 12psi, exhaust, intake thing you should be fine (on a new hg) for high boost/power applications a mhg is recommended (hks or cometic) basically... the original torque setting is the failure on the 7m (it's a very capable motor) 7mges also blow hg's... just take a little longer hehe __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

09-27-2005, 11:46 AM	#5
lethalwithasupra 3" Exhaust Join Date: Sep 2005 Location: south cantebury Posts: 112	related question what appeared to be a metal head gasket ( a thick metal gasket between two thin gaskets, held together by 4 rivets ) came out of my supra. mostly it was the corrosion and overheating, but one of the thin layers was cracked between bores 5 & 6. 3 & 4 loooked like they were just about ta go thru as well. is a mhg really the end-all ? understanding that my car is about as well taken care of as you'd expect ...

09-27-2005, 12:35 PM	#6
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	have you put it back together yet? can you take pics of the block and head surfaces (clean preferably) __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

09-28-2005, 08:14 AM	#7
lethalwithasupra 3" Exhaust Join Date: Sep 2005 Location: south cantebury Posts: 112	me ? yea its together, and the boss might have thrown the gasket out. i was going to frame it and the one i crimped when it went together the first time and hang them both on my wall. __________________ So I bought this old Honda bike, an NSR250. Bit of a street racer, I guess. I'm told they're fast. Delivering it home with a friend driving the Supra for the first time. I drop gears and make a scream from the twin pipes flowing down this pony's flanks and it takes off like it's tail's on fire. I look back when the Honda gets to its tap-out and the Supra's only two lengths behind. No one I've let ride my bike has told me its slow, they've all loved the thing. That car is a good thing indeed.

09-28-2005, 12:11 PM	#8
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	i would say machining was not up to scratch for the mhg just at a guess __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

09-30-2005, 08:14 AM	#9
lethalwithasupra 3" Exhaust Join Date: Sep 2005 Location: south cantebury Posts: 112	half the gaskets on the manifolds were so old they splintered taking them off. don't know if thats a good thing but when i saw it i smiled. 65 alright as a torque setting ? 58 was recomended, so we went a little higher. __________________ So I bought this old Honda bike, an NSR250. Bit of a street racer, I guess. I'm told they're fast. Delivering it home with a friend driving the Supra for the first time. I drop gears and make a scream from the twin pipes flowing down this pony's flanks and it takes off like it's tail's on fire. I look back when the Honda gets to its tap-out and the Supra's only two lengths behind. No one I've let ride my bike has told me its slow, they've all loved the thing. That car is a good thing indeed.

09-30-2005, 12:51 PM	#10
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	thats a badd thing if they splintered coming off...they musta taken a beating over the years __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ft*lbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

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