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Old 12-26-2005, 12:56 PM   #1 (permalink)
Rod65
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Head bolt torque sequence

I purchased a 1985 M1009 in Oct. and have enjoyed hunting out of it for the last two months. I've been loosing water in the radiator since I bought it. Didn't have enough experience to know the head gasket was blown. I'm in the process of pulling both heads now. Discovered the gasket was blown at rear cylinder on driver's side, will have the other head off later today. The heads have been previously rebuilt due to a blown head gasket before I purchased it. I suspect the previous owner reused the old head bolts. Anyway, the engine runs great so I want to do this right. What is the best head gasket I can get for my engine and what is the proper torquing sequence for the new head bolts? Thanks to anyone that can help!
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Old 12-26-2005, 02:06 PM   #2 (permalink)
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Moving this to the 6.5 section. Not an emergency..
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Old 12-26-2005, 03:23 PM   #3 (permalink)
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Quote:
Originally Posted by GMC2500HD View Post
Moving this to the 6.5 section. Not an emergency..
6.2 IIRC so moving there
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Old 12-26-2005, 06:21 PM   #4 (permalink)
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I use Fel-Pro gaskets, after-market bolts and torque using the factory recommended "angle torque" method. Start in the center and work clockwise to the outboard bolts. First pass, 25 lbs. Second pass, 50 lbs. Third pass, paint mark the edge of each bolt and tighten an additional 1/4 turn. The paint mark shows when 1/4 turn is reached. Go back over them with the wrench set at 110 lbs. They should all "click" at 110 setting, but not move.
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Old 12-26-2005, 09:04 PM   #5 (permalink)
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I did what Fred did but instead i painted the socket and did the 1/4 turn thing at the end, never had a problem with head gaskets after that. I used Fel-pro gaskets also. They say 90 degree's but i'm sure mine were a mix between 85 and 100 degree's turned.
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Old 12-26-2005, 09:47 PM   #6 (permalink)
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Thanks!

Now that's what I call service. Thanks so much for the info. I've been reading this forum for a couple of months now and it sure is a big help. I'll pick up a set of Fel-Pro gaskets this week and hopefully will be wheeling soon. I can't wait to get the CUCV back on the road. Everyone around here thought I was crazy for getting it but this old engine runs great. I think I'm hooked on these engines.
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Old 12-27-2005, 12:19 AM   #7 (permalink)
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Let me chime in on another aspect of sucessful head gasket replacement. Surface preparation. Gasket surface needs to be very clean, but I like to go one step further. Take a piece of straight steel (1/4x2x10in) and wrap it with some 100 grit wet dry sand paper. Use some wd40 as a lube and sand the head in a cross hatch pattern, then do the same on deck of block. This will give a good even semi rough finish and also highlight and surface defects. Also, clean all of the threads in the head bolt holes with a good tap 12mmx1.75 I think, then clean all surfaces super clean with brake clean. Fel pro also sells the head bolt sets for around 25.00 a side.
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Old 12-28-2005, 10:04 PM   #8 (permalink)
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I talked with the previous owner today. Turns out this is now the third time this engine has blown a head gasket. The first time he reused the old head bolts. Blew it again shortly thereafter. He then had the head resurfaced and rebuilt. That was in April of 04. He didn't know about a torque sequence and he used a standard head gasket. I'm hoping the proper torque sequence and the thicker head gasket since the head was resurfaced will alleviate this problem. I'm also going to clean the threads and get the 100 grit sand paper on a straight edge and rough up the surfaces. Fel-Pro gaskets and head bolts are on the way. Wish me luck! Thanks to everyone for the help!
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Old 12-29-2005, 12:24 AM   #9 (permalink)
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Pay close attention to what Fred482 said. Make sure you go around the torque sequence at least twice at 50 lbs and then after torqueing the additional 90 degrees, set a torque wrench and go over all the bolts again. I have had brand new bolts direct from gm that would never reach torque and had I not checked with a torque wrench, I'm sure the gasket would have failed rather quickly. If a bolt doesn't reach torque, replace it. If engine is have problems continuously blowing head gaskets, make sure injection pump timing is correct. Retarded timing will cause head gasket failure as will overly advanced timing.
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Old 12-29-2005, 01:22 PM   #10 (permalink)
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Good catch, Dave. I forgot about the new bolts that stretch. I've thrown out several in the last few repairs. I wonder if the quality is slipping? Wonder where these "cheap" sets come from? China? Just a thought. Might be time to look at ARP's. I've used the studs, (PITA) but never their bolts.
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