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Head & Cap Bolt Lube? #1102952 02/03/17 03:40 PM
Joined: Jan 2004
Posts: 383
Stevie Offline OP
Mudrunner
[Linked Image]

This book, along with the various Clymer, Chilton, or Haynes manuals on 20R powered trucks, do not mention using any type of bolt dressing when installing the 12mm Head or Main Bearing Cap Bolts.

Is this correct?

Steve


'80 4X4 Longbed
From the Off-Road World
Re: Head & Cap Bolt Lube? [Re: Stevie] #1102996 02/06/17 01:47 PM
Joined: Jan 2017
Posts: 17
L
Lha1988 Offline
Need a Spot
Most instructions recommend oil after cleaning threads[with a chaser or tap],using new head bolts,etc. I've used anti-seize on head bolts with good results. I usually clean the threads in the block with a brass brush and WD-40,then like a gun barrel,with oiled swabs. right before install.I spray carb cleaner and air to get any oil and gunk out. I always retorque after a few hundred miles and check valves.

Re: Head & Cap Bolt Lube? [Re: Stevie] #1103003 02/07/17 01:16 AM
Joined: Feb 2005
Posts: 7,387
rxinhed Offline
Trail Leader
*****
Make sure to double check whether the torque settings are for dry or lubed conditions. If the spec is set dry and you lube the threads with oil, anti-sieve, what have you, the result will be overtightened bolts or studs.

Re: Head & Cap Bolt Lube? [Re: Lha1988] #1103005 02/07/17 01:20 PM
Joined: Jan 2004
Posts: 383
Stevie Offline OP
Mudrunner
Originally Posted by Lha1988
Most instructions recommend oil after cleaning threads[with a chaser or tap],using new head bolts,etc. I've used anti-seize on head bolts with good results. I usually clean the threads in the block with a brass brush and WD-40,then like a gun barrel,with oiled swabs. right before install.I spray carb cleaner and air to get any oil and gunk out. I always retorque after a few hundred miles and check valves.


Thank you sir.

That's pretty much how I've done it in the past:
Run a flat-bottom 12 X 1.75 tap thru both Head Bolt and Crankshaft Bearing Cap holes, swiveling the block surface down, douching holes with Brake Cleaner, then blow out with compressed air. And it wouldn't be complete without me running a die over the bolt threads either. I haven't ever replaced Head Bolts.

Moly-B is the anti-seize product I've used. On Spark Plug threads too.
In your folk's estimation, is Molybdenum Disulfide Grease equal to the dedicated anti-seize products out there?

Thanks much.
Steve


'80 4X4 Longbed
Re: Head & Cap Bolt Lube? [Re: rxinhed] #1103006 02/07/17 01:22 PM
Joined: Jan 2004
Posts: 383
Stevie Offline OP
Mudrunner
Originally Posted by rxinhed
Make sure to double check whether the torque settings are for dry or lubed conditions. If the spec is set dry and you lube the threads with oil, anti-sieve, what have you, the result will be overtightened bolts or studs.


That's an interesting point.

Thank you!
Steve


'80 4X4 Longbed

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