Unbolting Aluminum heads?

Thad · 07-21-2002, 06:06 AM

Is there a certain way to unbolt aluminum heads? I was told by a mechanic friend that when you start to unbolt the heads you do it in reverse of the torquing sequence when putting them on. it was to prevent any bending or warpping of the heads. i'm planning to get the heads rebuilt.
Thanks
thad

ultraflo · 07-21-2002, 03:45 PM

I've been unbolting my heads in rev. sequence with an impact gun... Take the advice of the engine builder and you'll be fine...

Mach 1 · 07-21-2002, 03:57 PM

Just use common sense. Move around to spread the load evenly, weather tightening or loosening......dont start on one side and go across to the other side. Following the sequence in reverse is overkill and not required.

PKRWUD · 07-22-2002, 06:23 AM

I start on one end, and go back and forth in a shrinking circle until I reach the center bolts, which is kinda like reverse tightening order, but not as specific. The single most important thing to remember is to make sure the engine is completely cool. If possible, let it cool overnight before loosening the head bolts.

Take care,
~Chris

Thad · 07-27-2002, 07:31 PM

Thanks for the advice all. Sorry it took so long to reply back.
Well they're off! And what a pain in the ***! The long tube headers are a so in the way and i still haven't figured out how to get them out of the engine compartment without raising the engine. They need some cleaniing up.
Nothing seems to look unusual so far except for the piston tops.
they have alot of carbon deposit on them. is this normal? Is there anything that i can do while the heads are off to clean them up a bit or should i just leave them alone?
thanks
thad

PKRWUD · 07-27-2002, 08:06 PM

Clean them up with CRC Brakleen (green can) and compressed air. Make sure the gasket surface is completely clean! You will also need to get a 7/16 x 14 tap to clean out the head bolt holes in the block. This is VERY important!

Take care,
~Chris

Thad · 07-27-2002, 08:15 PM

Thanks PKRWUD. Can i use a scotch brite pad to help it along?
The heads were stud mounted, so i don't have to worry about the internal threads on the block.

PKRWUD · 07-27-2002, 08:24 PM

Quote:

Originally posted by Thad
Thanks PKRWUD. Can i use a scotch brite pad to help it along?

Absolutely! Just make sure to cover the lifter valley with a heavy towel to help keep debris out, and remember to blow everything out with compressed air often.

Take care,
~Chris

Thad · 07-27-2002, 08:33 PM

Thanks again PKRWUD!

07-21-2002, 06:06 AM	#1
Thad Registered Member Join Date: Oct 1999 Location: Stuart, FL US Posts: 192	Unbolting Aluminum heads? Is there a certain way to unbolt aluminum heads? I was told by a mechanic friend that when you start to unbolt the heads you do it in reverse of the torquing sequence when putting them on. it was to prevent any bending or warpping of the heads. i'm planning to get the heads rebuilt. Thanks thad __________________ 90 LX 5.0 ,bored 302, MSD 6AL, Twisted Wedge TrickFlo HDs, World class T5, BBK fender cold air induct., 70mm TB,Edelbrock performer Intake, aluminum Drve shaft, 3.55 Gears, Long Tube Headers to Flowmasters.

07-21-2002, 03:45 PM	#2
ultraflo NX dealer-man Join Date: Sep 1998 Location: Peoria, Illinois Posts: 977	I've been unbolting my heads in rev. sequence with an impact gun... Take the advice of the engine builder and you'll be fine... __________________ RLS Racing! 93 LX 9.20 @ 147mph 03 Mach 1 12.39 @ 116mph

07-21-2002, 03:57 PM	#3
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Just use common sense. Move around to spread the load evenly, weather tightening or loosening......dont start on one side and go across to the other side. Following the sequence in reverse is overkill and not required. __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

07-22-2002, 06:23 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I start on one end, and go back and forth in a shrinking circle until I reach the center bolts, which is kinda like reverse tightening order, but not as specific. The single most important thing to remember is to make sure the engine is completely cool. If possible, let it cool overnight before loosening the head bolts. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-27-2002, 07:31 PM	#5
Thad Registered Member Join Date: Oct 1999 Location: Stuart, FL US Posts: 192	Thanks for the advice all. Sorry it took so long to reply back. Well they're off! And what a pain in the ***! The long tube headers are a so in the way and i still haven't figured out how to get them out of the engine compartment without raising the engine. They need some cleaniing up. Nothing seems to look unusual so far except for the piston tops. they have alot of carbon deposit on them. is this normal? Is there anything that i can do while the heads are off to clean them up a bit or should i just leave them alone? thanks thad __________________ 90 LX 5.0 ,bored 302, MSD 6AL, Twisted Wedge TrickFlo HDs, World class T5, BBK fender cold air induct., 70mm TB,Edelbrock performer Intake, aluminum Drve shaft, 3.55 Gears, Long Tube Headers to Flowmasters.

07-27-2002, 08:06 PM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Clean them up with CRC Brakleen (green can) and compressed air. Make sure the gasket surface is completely clean! You will also need to get a 7/16 x 14 tap to clean out the head bolt holes in the block. This is VERY important! Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-27-2002, 08:15 PM	#7
Thad Registered Member Join Date: Oct 1999 Location: Stuart, FL US Posts: 192	Thanks PKRWUD. Can i use a scotch brite pad to help it along? The heads were stud mounted, so i don't have to worry about the internal threads on the block. __________________ 90 LX 5.0 ,bored 302, MSD 6AL, Twisted Wedge TrickFlo HDs, World class T5, BBK fender cold air induct., 70mm TB,Edelbrock performer Intake, aluminum Drve shaft, 3.55 Gears, Long Tube Headers to Flowmasters.

07-27-2002, 08:33 PM	#9
Thad Registered Member Join Date: Oct 1999 Location: Stuart, FL US Posts: 192	Thanks again PKRWUD! __________________ 90 LX 5.0 ,bored 302, MSD 6AL, Twisted Wedge TrickFlo HDs, World class T5, BBK fender cold air induct., 70mm TB,Edelbrock performer Intake, aluminum Drve shaft, 3.55 Gears, Long Tube Headers to Flowmasters.

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