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6g72 SOHC - Blowing Head Gaskets - Why? #1104188
02/14/18 07:56 PM
02/14/18 07:56 PM
tdf46  Offline OP
Wheeler
Joined: Sep 2010
Posts: 190
Pierce County, WA
I have been trying to bring a 93 Montero SR back to life. Had the engine parts machined at a reputable shop a couple years ago. Blew a head gasket soon after the rebuild. Fixed that one and later it happened again. So, I have blown a head gasket twice.

During the last head gasket replacement I was careful to assure that the head bolts were NOT bottoming out before the torquing.

The heads were milled a bit by the machine shop. So, now my thinkig is that the compression is slightly higher than stock, and the stock head gaskets are not holding up.

I'm considering installing ARP studs (allbeit an expensive alternative to standard head bolts).

If anyone has other ideas about what is happening to cause this 6g72 SOHC engine to blow gaskets, I'm all ears!

Thanks for reading

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Re: 6g72 SOHC - Blowing Head Gaskets - Why? [Re: tdf46] #1104194
02/15/18 03:04 AM
02/15/18 03:04 AM
rxinhed  Offline
Trail Leader
Joined: Feb 2005
Posts: 7,090
Gerber, CA *****
Even the 4-cyl guy, me, can direct you toward the investigation. The issue could simply be false torque on the headbolts. The 3.0L (6G72) has blind pockets for the headbolts and often bottom out. Especially if the heads have been milled. you need to measure the bolt length, measure the gasket thickness, etc. There should be room left over for bolt and often isn't.


1988 Mighty Max turbo 2.6 service body
1980 Power Wagon W400
Sundry Mitsubishi Montero Gen 1 parts
Parts vehicles: 1980 D50 2wd, 1988 Mighty Max 4wd, 89 LS Montero 4-door, 2002 Sport AWD
For Sale: 1989 Power Ram 50 extended cab
Re: 6g72 SOHC - Blowing Head Gaskets - Why? [Re: tdf46] #1104199
02/15/18 01:57 PM
02/15/18 01:57 PM
tdf46  Offline OP
Wheeler
Joined: Sep 2010
Posts: 190
Pierce County, WA
I was aware of the "bolts too long issue" and that's what I meant by my second sentense above.

However, I will once again measure to make sure the bolts are not bottoming out before th torque spec is reached. Or go to studs. If I find a bolt length issue, is the best resolution to add a second washer or do I need to grind off the bolt (hardened steel) ?

Thanks for your reply rxinhed.

Last edited by tdf46; 02/15/18 02:02 PM.
Re: 6g72 SOHC - Blowing Head Gaskets - Why? [Re: tdf46] #1104202
02/16/18 01:35 AM
02/16/18 01:35 AM
rxinhed  Offline
Trail Leader
Joined: Feb 2005
Posts: 7,090
Gerber, CA *****
I guess I'm guilty of just reacting, and I dot not even see the big "NOT"....sheesh


1988 Mighty Max turbo 2.6 service body
1980 Power Wagon W400
Sundry Mitsubishi Montero Gen 1 parts
Parts vehicles: 1980 D50 2wd, 1988 Mighty Max 4wd, 89 LS Montero 4-door, 2002 Sport AWD
For Sale: 1989 Power Ram 50 extended cab

Moderated by  Macka, Mudraider, off-roader, PajEvo, rxinhed 

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