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  1. G

    Fmtv engine swap to a Detroit 50 series.

    The later trucks used the intermediate MTV axle for the rear axle on the LMTV and eliminated much of the driveline angle problem. If the drivelines are serviced and balanced it's really not an issue. The u-joints are cheap - often about $40 to $60 in the surplus market - and can be considered a...
  2. G

    Gen 2 air conditioning install with C7 A1R - notes and pictures thus far.

    Well - the win with the factory unit is that the AC occurs before the heater core. So you first cool the air and drop it's dewpoint so the water falls out of it as condensation and is collected and allowed to drain from the unit. Then the SAME air is sent through the heater and heated so you...
  3. G

    Gen 2 air conditioning install with C7 A1R - notes and pictures thus far.

    Anyone on the fence on cab AC - DO IT!! I figured it would be the case, but I can confirm absolutely that the AC makes the defrost about 1000% better. No more fogged windows! Imagine totally clear windows even in the wettest conditions. Fogged windows are a huge annoying problem on these...
  4. G

    Stewart & Stevenson M1089A1 wiring diagrams?

    https://archive.org/details/fmtv-schematics-a-0-a-1-r
  5. G

    FMTV Gen 1 Air condition

    Looks the same to me. Get the harness from Tom that I linked above.
  6. G

    FMTV Gen 1 Air condition

    Show us the connections at the back..... but given that the Gen 2 basically plugged into the existing heater wiring and then only required the AC harness I linked to above I wouldn't think the Gen 1 would be any different. The AC harness has a 24v lead from the PDP (I ran mine to the 24v main...
  7. G

    FMTV Gen 1 Air condition

    I doubt the wiring is any different. I would recommend you just get the harness from Tom: https://lmtvtrucks.com/AC/index.html I posted the trinary switch pinout in my AC installation post in case you desire to change that out for a different model like I did.
  8. G

    Steering Dampener

    Sadly I think you will find the tires are flat spotted and ultimately on their way to being rotten - the vibration comes and goes as a result of the flat spots aligning or opposing and canceling each other out. My 2008 tires did this trick but did round back out and stop after daily driving my...
  9. G

    Steering Dampener

    Were you getting a lot of feedback from pot-holes, etc? I've done a bit off-road and also our roads have lots of pot-holes, etc and I really don't notice any jerking of my wheel..... on the contrary the power steering is ultra powerful and my truck tracks perfectly straight...... Very cool...
  10. G

    How long can I go after Alternator stops working w/four 12v batts? and diagnising/fixing 200amp hummer alt on LMTV

    Well - I deal with a lot of batteries being in the automotive industry and I can say that the quality in recent years has trended down - I'm told at least partially being built to a price but also the increasing use of "dirty" recycled lead that is not of the best quality. At any rate AAA (who...
  11. G

    M1078 LMTV Fix-up Thread

    A1+ trucks do have ECM's so they get their information in a much more typical fashion. Also less wiring since most of the "data" is over a serial bus and so only a few wires to carry the various protocols. It's actually simpler in a lot of ways - just requires different tools and techniques to...
  12. G

    Rubberized Undercoating

    Rubberized coating is a HUGE fail. It generally just results in sealing in the moisture and salt and causes worse corrosion - any minor rock chip will cause corrosion to spread under it. The best choices are self-healing surface coatings like Fluid-Film, Blaster Surface Shield, or a wax based...
  13. G

    Winter front. M1078

    Interesting - how was that mounted? The stock unit is a rubberized fabric canvas material that wraps around the radiator.
  14. G

    AC Installation. Charging capacity and oil capacity?

    I did turn over the compressor to ensure it would spin freely. And I fired up the system and it works great so far - I started with 3.75 lbs of refrigerant as my friend suggested and next time it's warm out I'm going to check the sight glass (it has a small one on the drier) and also watch...
  15. G

    Gen 2 air conditioning install with C7 A1R - notes and pictures thus far.

    Paint and done! Bracket is steel and of a thickness that is plenty ridgid for this application. The cushioned loop clamp is snug on the pipe fitting. (y)
  16. G

    Wire diagram m1078 a1

    I'll look when I get home but I'm pretty sure it's just grounding an ECM pin. The 4.8v is probably 5v reference from the ECM and grounding it momentarily probably toggles the high/low idle. I'll confirm in a few minutes.
  17. G

    Gen 2 air conditioning install with C7 A1R - notes and pictures thus far.

    Engine vibration, and the proximity of this hose to the pulley - it needs a bracket here for sure. Made one up. Pulled it back off for paint after this trial fit. It also keeps the compressor clutch wire managed away from moving parts.
  18. G

    New M-1083 owner. So, here we go!!

    I've never noticed any difference. I don't regularly use my battery disconnect - pretty much only if I'm doing electrical work, etc. I do drive my truck almost every day but it has also sat for weeks and had no issues. The transmission behavior is always the same. YMMV - my truck has the 3700SP...
  19. G

    Gen 2 air conditioning install with C7 A1R - notes and pictures thus far.

    1.5 years after ordering the initial batch of parts my AC is now functional! Vacuum and leak check passed with 100%. No loss of vacuum was detected. It took my machine 58 minutes (at a very non-optimal ambient temp of ~50 degrees) to charge 3.75 lbs of R134. The results I think speak for...
  20. G

    Gen 2 air conditioning install with C7 A1R - notes and pictures thus far.

    I'm not so sure about an aftermarket condenser - these units are REALLY big. About 4" thick. The aftermarket one's I've seen used are clearly undersized as they lower the system charge by .5 to .75 lbs. They may be more efficient but their fin density is really high and the location for the...
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