head bolt idea

superwhite · 12-02-2010, 04:21 PM

I dont have a blown head gasket but i was thinking of either replacing the head bolts one at a time or simply re-torquing the factory ones to a higher spec. Can this be done and if so what bolt order should I go in?

Green7mgte · 12-02-2010, 04:24 PM

consult your local tsrm for bolt pattern removal.. heres the link
Cylinder Head

91ma70 · 12-02-2010, 11:15 PM

I wouldn't recommend simply replacing the bolts one at a time because you should chase the threads on the block to get a proper reading on the torque setting. I would have the head off to chase..

btwilson86 · 12-03-2010, 04:53 AM

Not to mention that taking them out 1 at a time (leaving all of the other bolts torqued, as I understand it) will likely cause head warping, as well as destroying the gasket. Like Green7mgte said, follow the TSRM in that link he gave you.

Green7mgte · 12-06-2010, 06:07 AM

oh god no don't take them out one at a time...

remove them all in the correct ORDER in 2 passes.. that means loosen them in one pass.. then remove them in the other.

put your bolts in with a helicoil or something of the like and torque them to spec. few warm up / cool down cycles later torque them to spec again..

question..
with a helicoil or the like, is retorqueing still necessary?

MA70-3.0GT · 12-12-2010, 05:03 PM

why helicoil? didn't see anything about stripped threads???

Anyway I'd say don't do anything if it's not blown. (and certainly DON'T take the bolts out one at a time or in any other order than by the book!!!) Just wait till the first signs of it going (and it will eventually) and then follow the tsrm replacement guide but either use upgraded bolts/studs following their torquing instructions, or use new stock bolts (which are fine) just following the upgraded torque level & not the original 58lb rubbish

And when done, remember to burp the cooling system unless you enjoyed it so much you wanna do it all over again next week...

Green7mgte · 12-12-2010, 10:46 PM

why helicoil.. so they don't back out. or something else along those lines.
don't see why thats such an awful idea.
here.. buy concrete lag bolts and shove those babys in there.. they won't back out. hows that for bad ideas.

there is no problem with re torquing your head bolts. if you want to do it, just do it correctly. waiting untill you see signs of a BHG to start applying fixes is two steps backwards in theory and in pocket. if re torquing them now will save you failure in the future i see no reason not to do it, besides the guy above me saying not to.. =)

907mge · 12-13-2010, 12:53 AM

Helicoils don't stop bolts from coming back out. They are for when the threads are no longer useable and you still want to use the same bolt size as the original. They work well but the hole must be drilled out larger.

It is hard to say though without the milage and age to see if the hg may have already been done. Since a 20 plus year old car can get passed around alot over the years.

Green7mgte · 12-13-2010, 08:34 PM

yes im well aware of what they are. just stating they are a solution if your having problems with your bolts backing out..

so uh

. yea if you can get away with the same size bolt do it.. but if you have to retap them to a larger size just be slow and careful with it. make sure your bit is level for god sakes.

is the op even reading this thread any longer?

907mge · 12-13-2010, 09:26 PM

It can suck if you have to go with a larger size though if the hole for the bolt in the head is not large enough for the new bolt. I unfortunatly learned alittle on the subject when my brother and I did the hg on a 93 cavalier and snaped off 2 head bolts in the block.

I don't think the op is on here anymore. It seems we get quite a bit of new people that post a few times and dissapear.

12-02-2010, 04:21 PM	#1
superwhite Stock Join Date: Nov 2010 Location: LaPorte Posts: 12	head bolt idea I dont have a blown head gasket but i was thinking of either replacing the head bolts one at a time or simply re-torquing the factory ones to a higher spec. Can this be done and if so what bolt order should I go in?

12-02-2010, 04:24 PM	#2
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	consult your local tsrm for bolt pattern removal.. heres the link Cylinder Head __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

12-03-2010, 04:53 AM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Not to mention that taking them out 1 at a time (leaving all of the other bolts torqued, as I understand it) will likely cause head warping, as well as destroying the gasket. Like Green7mgte said, follow the TSRM in that link he gave you. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

12-06-2010, 06:07 AM	#5
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	oh god no don't take them out one at a time... remove them all in the correct ORDER in 2 passes.. that means loosen them in one pass.. then remove them in the other. put your bolts in with a helicoil or something of the like and torque them to spec. few warm up / cool down cycles later torque them to spec again.. question.. with a helicoil or the like, is retorqueing still necessary? __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines :

12-12-2010, 05:03 PM	#6
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	why helicoil? didn't see anything about stripped threads??? Anyway I'd say don't do anything if it's not blown. (and certainly DON'T take the bolts out one at a time or in any other order than by the book!!!) Just wait till the first signs of it going (and it will eventually) and then follow the tsrm replacement guide but either use upgraded bolts/studs following their torquing instructions, or use new stock bolts (which are fine) just following the upgraded torque level & not the original 58lb rubbish And when done, remember to burp the cooling system unless you enjoyed it so much you wanna do it all over again next week... __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

12-02-2010, 11:15 PM	#3
91ma70 3" Exhaust Join Date: Feb 2010 Location: Irvine/Lancaster CA Posts: 61	I wouldn't recommend simply replacing the bolts one at a time because you should chase the threads on the block to get a proper reading on the torque setting. I would have the head off to chase..

12-12-2010, 10:46 PM	#7
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	why helicoil.. so they don't back out. or something else along those lines. don't see why thats such an awful idea. here.. buy concrete lag bolts and shove those babys in there.. they won't back out. hows that for bad ideas. there is no problem with re torquing your head bolts. if you want to do it, just do it correctly. waiting untill you see signs of a BHG to start applying fixes is two steps backwards in theory and in pocket. if re torquing them now will save you failure in the future i see no reason not to do it, besides the guy above me saying not to.. =) __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines : Last edited by Green7mgte; 12-12-2010 at 10:52 PM.

12-13-2010, 12:53 AM	#8
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Helicoils don't stop bolts from coming back out. They are for when the threads are no longer useable and you still want to use the same bolt size as the original. They work well but the hole must be drilled out larger. It is hard to say though without the milage and age to see if the hg may have already been done. Since a 20 plus year old car can get passed around alot over the years. Last edited by 907mge; 12-13-2010 at 12:56 AM.

12-13-2010, 08:34 PM	#9
Green7mgte Supra Forum Moderator Join Date: Nov 2009 Location: Green-Ohio Posts: 1,297	yes im well aware of what they are. just stating they are a solution if your having problems with your bolts backing out.. so uh . yea if you can get away with the same size bolt do it.. but if you have to retap them to a larger size just be slow and careful with it. make sure your bit is level for god sakes. is the op even reading this thread any longer? __________________ 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines : Last edited by Green7mgte; 12-13-2010 at 08:37 PM.

12-13-2010, 09:26 PM	#10
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	It can suck if you have to go with a larger size though if the hole for the bolt in the head is not large enough for the new bolt. I unfortunatly learned alittle on the subject when my brother and I did the hg on a 93 cavalier and snaped off 2 head bolts in the block. I don't think the op is on here anymore. It seems we get quite a bit of new people that post a few times and dissapear.

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