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First shakedown and I have a question about the fan clutch

spankybear

spankybear

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I took my M1152A1 out for the day on it's first shake to see how things are running. The truck drove well and ran really good and strong. One of the things that I noticed was how much the fan was cycling. It was a relatively cool day (upper 60s) and doing highway speeds and the fan cycled on a few times. Is this normal? The temp gauge was in the middle of the green (one of the colored gauges). No signs of overheating and everything else seemed normal. I would have thought the ram air would suffice to keep everything cool and not need the fan.

Another unrelated thing was towards the evening it stared to rain. Didn't realizes how much they leak😲
IMG_4270.JPG
 
Mullaney

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spankybear said:
I took my M1152A1 out for the day on it's first shake to see how things are running. The truck drove well and ran really good and strong. One of the things that I noticed was how much the fan was cycling. It was a relatively cool day (upper 60s) and doing highway speeds and the fan cycled on a few times. Is this normal? The temp gauge was in the middle of the green (one of the colored gauges). No signs of overheating and everything else seemed normal. I would have thought the ram air would suffice to keep everything cool and not need the fan.

Another unrelated thing was towards the evening it stared to rain. Didn't realizes how much they leak😲
View attachment 931780
Click to expand...
.
Yep. You need a raincoat inside the truck if it is raining.
Other than that, spot a leak, fix a leak - rinse, lather, and repeat...

And ram air isn't really gonna do it.
 
Mainsail

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What you describe about your fan cycling is no different than mine. As the gauge needle approaches 12-o-clock the fan kicks on, and runs for about the same time as it takes to regain control after the adrenaline dump it caused.

Mine (soft top and doors) leaks during the rain, but nothing in the forward cab area, all in the back and mostly when it's static. So the back seats get moist, the fronts are dry. I am noticing a slight leak in the windshield seal that will cause a small drip down the inside of the glass during very hard rain, but I suspect it'll be an easy fix with a new seal.
 
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canadacountry

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its been many years but I still recall a certain magazine article that talk about english cars sold in canada or north america (I forgot which two it was) and one particular car was 'badmouthed' with the like of "even if the vents are closed, as soon as it rains it will leak water down your legs always" .. ouch!

and if thats not all the hillman was specifically mentioned too, why? well.."it seriously lacks any hill power, you have to go uphill in first gear" ummm uhh yeah don't look at me I don't even know what to make of that either

anyway yeah sorry..soo non-military offtopic this is but yeah if you thought that water on your head was bad then you would like gushing onto your legs (socks-in-shoes and all) a lot less especially in more sensitive downtown clothings (versus hardy soldier uniforms) i'm sure
 
spankybear

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After some thought the fan is controlled by the engine block temp and not the radiator temp. Like a small block Chevy the hot air blowing though the rad is controlling the fan clutch and not the engine block temp. It would be interesting to see if the 300,000 SN trucks have any issue with ram air with the gear fan drive and thermal clutch.
 
spankybear

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What if someone wanted to put a standard fan clutch on like I have linked below. Is there a good choice for a fan that would fit? Or is there somewhere that list the fan sizes like off a Chevy pickup? This would sure make it way nicer to drive...

 
M

mrfarb

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I swapped to a viscous clutch on my old A2 truck I had and it worked great, but I got it from one of the guys that makes them for the Hmmwv - it really was nice not having that loud fan kick in. My new 1151 is a rev truck and it’s super quiet when the fan “kicks in”, sometimes I don’t think it even goes full speed unless I’m on the highway.
 
NDT

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Several threads here on converting to the Hummer H1 viscous clutch, use search term viscous. I changed over eons ago and never looked back.
 
thoner7

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Black dog customs has a kit they sell for viscous fan clutch.

blackdogcustoms.com

Turbo HMMWV Hydraulic Fan Clutch Delete Kit - Black Dog Customs

- Hydraulic fan clutches are now obsolete, no new stock available. Black Dog Customs has the ONLY complete hydraulic fan clutch delete kit on the market! ***Our Turbo Kit includes Our specially designed shims, to give you the needed extra clearance you need on your turbo truck. ***
blackdogcustoms.com blackdogcustoms.com

They have kits for non turbo as well
 
spankybear

spankybear

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NDT said:
Several threads here on converting to the Hummer H1 viscous clutch, use search term viscous. I changed over eons ago and never looked back.
Click to expand...
I did take a look and saw you used H1 parts. It seems these parts (from H1 part vendors) have dried up. I was looking for a GM parts.
 
spankybear

spankybear

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thoner7 said:
Black dog customs has a kit they sell for viscous fan clutch.

blackdogcustoms.com

Turbo HMMWV Hydraulic Fan Clutch Delete Kit - Black Dog Customs

- Hydraulic fan clutches are now obsolete, no new stock available. Black Dog Customs has the ONLY complete hydraulic fan clutch delete kit on the market! ***Our Turbo Kit includes Our specially designed shims, to give you the needed extra clearance you need on your turbo truck. ***
blackdogcustoms.com blackdogcustoms.com

They have kits for non turbo as well
Click to expand...
705 bucks... yeah no...

The above links parts prices

Fan clutch $67 GMB brand. I have had very good luck with this brand.
Fan $66 GM OEM the gold standard for parts.

So far I am up to $133 So $572 in savings.

Need to find a pulley that will work. I could turn down the ones In the truck to fit and would be easy. But want see if there is a off the shelf pulley. I am looking.

I am all for people making money. Maybe Blackdog's pulley source is charging a premium. But what I am seeing I can get the parts for is v. what he is charging. This isn't for me. Plus what fun is it to just buy a kit vs trying to figure it out . Not only is it fun I will have money to do something else... Like maybe a set of fuzzy dice?
 
Thunderbirds

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spankybear said:
705 bucks... yeah no...

The above links parts prices

Fan clutch $67 GMB brand. I have had very good luck with this brand.
Fan $66 GM OEM the gold standard for parts.

So far I am up to $133 So $572 in savings.

Need to find a pulley that will work. I could turn down the ones In the truck to fit and would be easy. But want see if there is a off the shelf pulley. I am looking.

I am all for people making money. Maybe Blackdog's pulley source is charging a premium. But what I am seeing I can get the parts for is v. what he is charging. This isn't for me. Plus what fun is it to just buy a kit vs trying to figure it out . Not only is it fun I will have money to do something else... Like maybe a set of fuzzy dice?
Click to expand...
.

Any specific source for the clutch?

Thanks!
 
spankybear

spankybear

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Heck if I needed to replace the water pump I would see if this set up would work. I HAVE NOT TRIED THIS AND DO NOT KNOW IF THIS WIOULD WORK. Just thinking and typing my thoughts here.

Water pump. pulley and fan clutch $138 . Again GMB as I have had good luck in the past.

And the fan about $66 bucks for a total of $204. If that would work fuzzy dice for at lease 50 people here with the savings

If you want AC Delco
Water pump $191
Fan Clutch $116
Total for all OE part $373 Not as may fuzzy dice savings but OE quality. Again if this would work. I would have to see the diameter of the pulley to see if the stock belt will fit.
 
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