Blown Head Gasket repair w/pics

OfnaRcR · 01-20-2007, 06:33 AM

Looks great. I hate head bolts, my friend stripped 2 of them today trying to get a head off his prelude.

IHateHacks · 01-21-2007, 04:43 PM

Your worst nightmare-

I'd rather trade 10 blown head gaskets for 1 stripped out bolt threads. This is the 4th helicoil I had to install into this head. I'd rather have had to do the head gasket 40 times over.

And this happened NOT from overtorqueing, I have a DIGITAL torque wrench that displays LIVE real time torque values 5 times a second. This is to prove that Toyota aluminum is weak and will strip out from normal torque values.

IHateHacks · 01-21-2007, 08:56 PM

How do my new threads look? These were made by my me, a non-professional. Just an amateur automotive technician. No power tools or machines.

It sucks working on a car from 9 am to 4 pm in 25 degree weather.

ddmcse · 01-22-2007, 01:01 PM

lol
it's a love hate relationship for sure

IHateHacks · 01-22-2007, 06:18 PM

You can say that again Dan. Just installed the helicoil and put the exhaust manifold on.

Now it's classroom time! I borrowed a friends tech school book and was browsing the bolt torque section and found this chart. It showed the correct torque value modification due to lubricant on the threads. I found this interesting. I used copper anti-seize on the perfectly clean brand new studs. On this chart it says with anti seize on the threads to use a 40% reduction in torque (OEM specified torque). I did the math and for 29 ft/lbs thats 17.4 ft/lbs (good thing my digital torque wrench goes to tenths of a foot pound). But I didn't feel comfortable torquing at such a low value so I only did a 15% reduction this time which is 24.65 ft/lbs but I just did 24 ft/lbs (actually 23.6 ft.lbs). Yeah I like to get technical when It comes to torqueing shit.

IHateHacks · 01-25-2007, 02:53 AM

Just finished rebuilding the stock fuel injectors. Installed the fuel rail and intake manifold. It's a shame I don't have the money for 550's.

IHateHacks · 01-27-2007, 12:54 AM

Really can't believe the weather I've been having here. It was 9 degrees F today with a -10 F wind chill. Can't get anything done with numb hands. I picked the perfect time to change a head gasket. Better now than to have to have the car down for the summer. Don't have to drive it in all the salt on the roads at least.

01-22-2007, 01:01 PM	#4
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	lol it's a love hate relationship for sure __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

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01-20-2007, 06:33 AM	#1
OfnaRcR 3" Exhaust Join Date: Oct 2006 Location: bvjhgfh Posts: 97	Looks great. I hate head bolts, my friend stripped 2 of them today trying to get a head off his prelude.

01-21-2007, 04:43 PM	#2
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Your worst nightmare- I'd rather trade 10 blown head gaskets for 1 stripped out bolt threads. This is the 4th helicoil I had to install into this head. I'd rather have had to do the head gasket 40 times over. And this happened NOT from overtorqueing, I have a DIGITAL torque wrench that displays LIVE real time torque values 5 times a second. This is to prove that Toyota aluminum is weak and will strip out from normal torque values.

01-21-2007, 08:56 PM	#3
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	How do my new threads look? These were made by my me, a non-professional. Just an amateur automotive technician. No power tools or machines. It sucks working on a car from 9 am to 4 pm in 25 degree weather.

01-22-2007, 06:18 PM	#5
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	You can say that again Dan. Just installed the helicoil and put the exhaust manifold on. Now it's classroom time! I borrowed a friends tech school book and was browsing the bolt torque section and found this chart. It showed the correct torque value modification due to lubricant on the threads. I found this interesting. I used copper anti-seize on the perfectly clean brand new studs. On this chart it says with anti seize on the threads to use a 40% reduction in torque (OEM specified torque). I did the math and for 29 ft/lbs thats 17.4 ft/lbs (good thing my digital torque wrench goes to tenths of a foot pound). But I didn't feel comfortable torquing at such a low value so I only did a 15% reduction this time which is 24.65 ft/lbs but I just did 24 ft/lbs (actually 23.6 ft.lbs). Yeah I like to get technical when It comes to torqueing shit.

01-25-2007, 02:53 AM	#6
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Just finished rebuilding the stock fuel injectors. Installed the fuel rail and intake manifold. It's a shame I don't have the money for 550's.

01-27-2007, 12:54 AM	#7
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Really can't believe the weather I've been having here. It was 9 degrees F today with a -10 F wind chill. Can't get anything done with numb hands. I picked the perfect time to change a head gasket. Better now than to have to have the car down for the summer. Don't have to drive it in all the salt on the roads at least.