What have you done to your HMMWV today/lately

[Daves86]

Got the tires changed. Took all weekend but looks and drives better

Opted to set up tires to run in the same direction so the tread looks the same on all 4 corners.

 

[Thumper580]

Installed a backup light on the M998, with the pressure switch added to the gear shift selector...and it works!!!
Also adjusted the handbrake and it now holds it still.... WOOHOO. Also out n a new EESS module.

 

[rcamacho]

Installed a backup light on the M998, with the pressure switch added to the gear shift selector...and it works!!!
Also adjusted the handbrake and it now holds it still.... WOOHOO.

Need pictures...


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[Mogman]

Spent most of the day mounting 4 new ATs on 24 bolt rims with TrailWorthy bead locks, gunna be sore tomorrow (read I am getting old LOL)

Just word of caution, I purchased two of the 24 bolt wheels from Trailworthy, they were a good deal especially when combined with bead locks and the wheels were in very good condition, the only caveats are they were shipped with new nuts and o rings, the o rings were the much more common and cheap 8 bolt o rings, I would of course never use those.

I had already purchased 120 grade 8 locking flange nuts (Built 5 wheels total) and 24 grade 8 regular flanged nuts for "assembly and leak testing" then I would blow down the tires and replace every other one, torque and then the other 12 and torque.

The nuts supplied by TrailWorthy appear to be grade 2 (no markings) and non locking, I decided to use them for assembly but could feel them start to yield before reaching my target for assembly of 110 LB-FT so dump those if you ever get any..

 

[Cetme24]

Made a bifold Tonneau for the truck from a trifold Toyota Tonneau. I was going to cover it with material from my old crew cover but it was to stiff and fragile. I just ended up reusing the factory material.

 

[Ajax MD]

Wife's truck has had the very, very occasional "episode" where the fan doesn't engage. It seems to happen if the truck sits for a few weeks without being driven. If I unplug the TDM, the fan engages so that rules out the control (cadillac?) valve.

Over the last few days, the problem is finally more consistent so I'll try the troubleshooting procedure in the TM and try to determine if it's the thermostatic switch or the TDM.

 

[TOBASH]

Wife's truck has had the very, very occasional "episode" where the fan doesn't engage. It seems to happen if the truck sits for a few weeks without being driven. If I unplug the TDM, the fan engages so that rules out the control (cadillac?) valve.

Over the last few days, the problem is finally more consistent so I'll try the troubleshooting procedure in the TM and try to determine if it's the thermostatic switch or the TDM.

Simple fix. Make sure you send your wife on errands every day so the rig does not sit. Keeping her busy will make your life easier and your rig will not need fixing.

Surprised you didn't think of that.

 

[Milcommoguy]

Good to hear someone found the TM's and trouble shooting guide. Makes for factual understanding right at one finger tips... Then again the tips here can be good too. Waiting on TOBASH's Utube stardom.

Crossover thermostatic switches are a common fail point and key to operation. Make SURE to get the quality OEM switch. Know your supplier. (blue tag)

If it is old and funky change it and sleep well. One of the better HumV upgrades / money spent IMO
Not a fan... haha... of just swapping stuff & shot gunning, but old and unknown, its action intermittent / questionable... R & R.

Keep the TM's handy & dry.......

Get it RIGHT now... as winter is right around the corner, CAMO

 

[Ajax MD]

Grrrr....

There are 2 thermostatic switches called out in the parts manual-

One is screwed into the piping near the front of the engine and the other is screwed into the side of the passenger's side cylinder head. It seems to me that they both operate on the temperature of the coolant.

Which one of these controls the engine fan operation? What does the other thermostatic switch control?

I'm looking at the 24P-1, Section II, Figure 66.

Edit- Nevermind, I figured it out by looking at some of the vendor websites. The one in the cylinder head is the "advance" (for fuel delivery?) and the one in the crossover piping is the fan switch.

 

[Milcommoguy]

Grrrr....

There are 2 thermostatic switches called out in the parts manual-

One is screwed into the piping near the front of the engine and the other is screwed into the side of the passenger's side cylinder head. It seems to me that they both operate on the temperature of the coolant.

Which one of these controls the engine fan operation? What does the other thermostatic switch control?

I'm looking at the 24P-1, Section II, Figure 66.

Edit- Nevermind, I figured it out by looking at some of the vendor websites. The one in the cylinder head is the "advance" (for fuel delivery?) and the one in the crossover piping is the fan switch.

Google and SS are your friends.

TM's are your BFF, CAMO

 

[Thumper580]

Installed two H4 high output headlights. Bought some Packard connectors to use the oem plugins.... It's brighter.. The first picture is inside the headlight bucket with original wires to oem headlights.

 

[Thumper580]

Grrrr....

There are 2 thermostatic switches called out in the parts manual-

One is screwed into the piping near the front of the engine and the other is screwed into the side of the passenger's side cylinder head. It seems to me that they both operate on the temperature of the coolant.

Which one of these controls the engine fan operation? What does the other thermostatic switch control?

I'm looking at the 24P-1, Section II, Figure 66.

Edit- Nevermind, I figured it out by looking at some of the vendor websites. The one in the cylinder head is the "advance" (for fuel delivery?) and the one in the crossover piping is the fan switch.

Whats the part number for the fan thermostatic switch? Thanks. Think mine isn't working.

 

[Ajax MD]

Whats the part number for the fan thermostatic switch? Thanks. Think mine isn't working.

Thermostatic Switch (Engine Fan) For HMMWV, 12338599

Thermostatic switch for engine fan control on all versions of the HMMWV (all 6.2L and 6.5L engines). P/N 12338599, also replaces 9705400, 5594181, AD105-503. NSN 5930012377322. Normally closed contacts open on temperature rise approximately 220F. This switch provides the input signal to...

www.eriksmilitarysurplus.com

 

[Milcommoguy]

Thermostatic Switch (Engine Fan) For HMMWV, 12338599

Thermostatic switch for engine fan control on all versions of the HMMWV (all 6.2L and 6.5L engines). P/N 12338599, also replaces 9705400, 5594181, AD105-503. NSN 5930012377322. Normally closed contacts open on temperature rise approximately 220F. This switch provides the input signal to...

www.eriksmilitarysurplus.com

Many to chose from. My personal choice. Skimp on quality, pick up some headache pills too, CAMO

 

[Ajax MD]

Many to chose from. My personal choice. Skimp on quality, pick up some headache pills too, CAMO

View attachment 813150

Where are you ordering that from? I've heard of the "blue tag" but didn't know who sells it.

 

[rcamacho]

Installed improved starter support bracket and finished repainting oil pan before re-installation.

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[Mogman]

Installed improved starter support bracket and finished repainting oil pan before re-installation.

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Boy they flubbed that one "SUPPORT STARTED MOTOR"

 

[crwray]

Replaced my leaky fuel pump (what a pain) and replaced some old fuel and vent lines. Changed a leaky surge tank hose while I was at it.

Finished my abbreviated troop seats with 3 bows. Going to shorten the bows and attach some OD canvas which will extend out for an awning while camping.

 

[Phoenix77]

I replaced the rear differential and brake lines in my 1986 AM General M998. Now it actually drives in "H", not just "HL", which I know is murder on the truck on high traction surfaces.

The differential I took out was original to the truck, so I'm willing to accept 34 years and 87k miles as a decent service life and it died of natural causes- probably the reason it got surplused anyway.

I got all this done just in time to drive it on the beach at the Cape Lookout National Seashore next weekend, which I'm really looking forward to.

 

[Phoenix77]

One of the guys at work was a HMMWV driver during his time in the Army and he told me his motor pool Sargeant told him to always drive in HL - even on base .

That is completely antithetical to the TM, but his time in the service was during the time my HMMWV would've been putting around Ft. Bragg. Not saying he drove my M998 back in the day, just that maybe that was the prevailing thought process when my HMMWV got the most use, contributing exponentially to a dead rear diff.