Red Dot A/C compressor

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Red Dot A/C compressor

Post by blhar15 » Thu Jun 26, 2014 3:11 pm

I have a Red Dot complete A/C kit for my M1043A2, 6.5L NA engine. We are having problems getting the compressor to mount up in the engine compartment with the bracket that came with it. This is for a serpentine belt system. It just does not line up exactly and the belt will come off. Any help would be appreciated.

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Re: Red Dot A/C compressor

Post by dilvoy » Thu Jun 26, 2014 4:04 pm

Have you installed the correct water pump for the serpentine belt system? If you have a water pump on a 6.2 and 6.5 for use with the V Belt system the shape of the water pump may interfere with you installing that bracket and most importantly, it will be driven backwards by the serpentine belt so it won't do it's job.
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Re: Red Dot A/C compressor

Post by 86humv » Thu Jun 26, 2014 8:15 pm

There are two different Surp. belt systems.
And there are two different Redot set ups for surp.
Where is your power steering pump reservoir.....on the pump, or is it a round resv. on top of engine on the left side.
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Re: Red Dot A/C compressor

Post by dilvoy » Thu Jun 26, 2014 9:00 pm

86humv wrote:There are two different Surp. belt systems.
And there are two different Redot set ups for surp.
Where is your power steering pump reservoir.....on the pump, or is it a round resv. on top of engine on the left side.
OH Boy! Humvees are going to be fun to put together years from now with all the different things that they have had added to them over the years of revisions.
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Re: Red Dot A/C compressor

Post by blhar15 » Fri Jun 27, 2014 3:33 am

The power steering pump reservoir is on the pump.
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Re: Red Dot A/C compressor

Post by 86humv » Fri Jun 27, 2014 6:49 am

blhar15 wrote:The power steering pump reservoir is on the pump.
OK, you have the early system.
I have the brackets for that.
I'll get some photo's of them later.
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Re: Red Dot A/C compressor

Post by blhar15 » Mon Jun 30, 2014 4:51 am

Here are a couple of pictures of our setup showing without the belt installed. I am beginning to think we have the wrong belt at this point. It appears now it all lines up, but when you stop the engine, the tensioner jumps a bit and the belt comes off the pulley.

Image

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Re: Red Dot A/C compressor

Post by Ted Gates » Mon Jun 30, 2014 6:23 am

There is a clutch pulley for the 12/24v generator to relieve the inertia of the generator. I do not have the part number currently at hand.

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Re: Red Dot A/C compressor

Post by blhar15 » Mon Jun 30, 2014 6:47 am

Is this the part you are referring to?

12469483 - Pulley, Overrunning Clutch
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Re: Red Dot A/C compressor

Post by Retired War Horses » Mon Jun 30, 2014 7:35 am

Do you have the shield on the PS pump pully? That was added to prevent belt jump off.
And later the Alt clutch pulley.....I have had several trucks with red dot/serp setups that have issues...the v-belts are much
More forgiving.
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Re: Red Dot A/C compressor

Post by 86humv » Mon Jun 30, 2014 7:50 am

blhar15 wrote:Is this the part you are referring to?

12469483 - Pulley, Overrunning Clutch
There are 3 pulleys for the 200amp, non clutch, for the early stamped steel surp. system, and a clutch and non clutch pulley for the late cast steel surp. systems.
I've had all 3.
The early 200 amp non-clutch pulley is longer than the other two pulleys for the late system.
You have the early system.
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Re: Red Dot A/C compressor

Post by jwaller » Mon Jun 30, 2014 2:23 pm

Hth. I have about 20k miles on my
Setup no over run alt clutch and smooth idlers. I setup this all up on the bench before install as I has to play with pulley size to get it right. The book setup wld not work

Never thrown the belt never replaced the belt. I do have the clutch for the alt but it works so well I'm not changing it
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M35A2 W/W .69 OD gears.
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Re: Red Dot A/C compressor

Post by jwaller » Mon Jun 30, 2014 2:43 pm

It does chirp when I shut it down but it does that with the ac off or on. Kinda like the old dodge cummins trucks.
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Re: Red Dot A/C compressor

Post by Retired War Horses » Tue Jul 01, 2014 6:23 am

jwaller wrote:Hth. I have about 20k miles on my
Setup no over run alt clutch and smooth idlers. I setup this all up on the bench before install as I has to play with pulley size to get it right. The book setup wld not work

Never thrown the belt never replaced the belt. I do have the clutch for the alt but it works so well I'm not changing it

I had planned on the exact setup you have some time ago on a customer truck...I did not do it because as you see, you have a smooth pulley with the ribbed side of the serp belt contacting the smooth surface. So I put in a 7 groove pulley.
But I see it's working for you....the issue to this day with that customer truck is it eats serp belts...recently I advised customer to NOT use the AC for a few hundred or more miles to determine did the issue is the AC unit while it runs...low and behold, after several hundred miles there is no issues with the belt, this tells me it's an alignment issue...one that I can't see anyway. Unless the belt is the wrong size. But the belt fits quite nicely, not to long, not to short....
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Re: Red Dot A/C compressor

Post by Action » Tue Jul 01, 2014 8:40 am

There are plans in the TM for making a pulley alignment tool.

Jason

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