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Location:
Melbourne
Registered:
May 2002
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 HKS Metal Head Gasket (4AGE) / Head bolt torque
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Fri, 20 May 2005 05:52
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Hi all,
I recently built a new 4AGE using a (2mm) HKS metal head gasket, spraying it with Hylomar and torquing the head bolts as specified in the Toyota manual.
It ran for about 5 mins before I saw coolant and oil leaking out the exhaust side.
It turned out the exhaust side head bolts had come loose. Examining the gasket and the head/block surfaces, it appears that they never really sealed. Neither the block or head were decked in the rebuild.
Can anyone suggest what I did wrong?
Do HKS metal head gaskets require hylomar/sealant? I understand they are coated with a rubber compound.
Do the exhaust side head bolts require greater torque because they are longer?
Thanks 
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I Supported Toymods
Location:
Lwr Templestowe, Melbourne
Registered:
August 2004
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Fri, 20 May 2005 05:56
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| cswan wrote on Fri, 20 May 2005 15:52 |
Neither the block or head were decked in the rebuild.
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I reckon this is it.
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Location:
Brisbane
Registered:
April 2004
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Fri, 20 May 2005 07:07
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Sounds about right to me also i'd start by getting the head checked first.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Fri, 20 May 2005 12:58
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| Quote: |
exhaust side head bolts had come loose
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i think that is impossible, except for a seriously overheated head that will expand & stretch them. i don't think you ever tightened them.
also the 2mm gasket is for lowering compression and should be more then enough to cope with a head & block that haven't been gorssly over cooked.
if the head and the block were not checked, then it wasn't rebuilt.
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Location:
cambo
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Fri, 20 May 2005 23:40
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if the head and block are fine and your using a regular head gasket you might not need to machine them. but if your using a metal head gasket you definately should. i also recommend getting the head o-ringed also with a MHG. and another thing, i usually do head bolts tighter than recommended unless they are torque to yield.
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Location:
Melbourne
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sat, 21 May 2005 02:21
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Thanks to everyone for your replies. 
FWIW, the motor was not rebuilt as a result of overheating. The head and block were checked for squareness and the engine builder did not see the need to deck either surface.
From what I've read, I still reckon it might be that's what I need to do, however, because the MHG is harder.
I'll give it another burl checking the torque more carefully. I'm using factory head bolts.
Back to the garage....... 
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sat, 21 May 2005 04:32
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remove head
deck block and head to attain uniform surface
replace o ring
use new MHG
torque down as per manual or OEM advice. no more no less.
run in engine @ idle for 30 mins (allowing thermo to open fully) checking for leaks
if none go nuts
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Location:
On your mum!
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sat, 21 May 2005 09:13
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The head bolts should be tightened to the gasket manufacturers suggested torque. Multi layer metal shim gaskets should not be used with O rings (to the best of my knowledge).
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sat, 21 May 2005 09:40
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| YelloRolla wrote on Sat, 21 May 2005 17:13 |
The head bolts should be tightened to the gasket manufacturers suggested torque. Multi layer metal shim gaskets should not be used with O rings (to the best of my knowledge).
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This is correct, as they are a harder metal layered with a rubbery type compound unlike the copper ones which need the extra support the o-rings provide.
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Location:
cambo
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sun, 22 May 2005 08:58
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is the hks a multilayer gasket or is it copper?
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sun, 22 May 2005 09:02
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I'd assume multi.
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Location:
Melbourne
Registered:
May 2002
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Re: HKS Metal Head Gasket (4AGE) / Head bolt torque
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Sun, 22 May 2005 10:06
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It's multi-layered and covered with a rubber resin
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