Serpentine belt for 1165-A1?

[Gear Report]

Howdy folks!
Do you know which serpentine belt is used on the 1165A1 with 6.5L turbo and 400A generator? I've dug through every TM I can find and can't find a definitive answer for trucks with a serial number over 300,000 (mine is 313,7xx). I found an older TM that specifies a belt for trucks after 196k-ish, but then they changed to the geared fan drive for trucks after 300k. I suspect it might be a different belt, but don't know. The routing is definitely different, with the REV B trucks having an additional idler pulley (Idler pulley #1 in the right diagram of the attached pic.

 

[Retiredwarhorses]

There are 2 belts, and it depends on if you have clutch or non-clutch pulley on the 400amp.
if it’s the clutch pulley, it’s the standard belt 300k and above....not sure what it is for solid pulley, but the belt is about 1-1.5in longer.

 

[Retiredwarhorses]

And it makes no difference on SN for the serp setup, you have either old style serp that uses a plate, or the late style
that is all mounted on cast iron brackets. The late Style is on many many M1123’s and M1097A2’s, but many of the early
series use the old style. The geared fan drive REV trucks will always have the late style.

 

[Gear Report]

Thanks, Steven!
Can you tell from this pic which one it is?
And can you share both part numbers and where I should have looked to find them? I'd like to document them for when others ask.

 

[Retiredwarhorses]

You have the clutch pulley...12469149-3

Hummer Parts Guy (HPG) - 01-488-5606 | BELT, SERPENTINE (196901 ABOVE) [114 IN]

www.hummerpartsguy.com

 

[HoveringHMMWV]

And it makes no difference on SN for the serp setup, you have either old style serp that uses a plate, or the late style
that is all mounted on cast iron brackets. The late Style is on many many M1123’s and M1097A2’s, but many of the early
series use the old style. The geared fan drive REV trucks will always have the late style.

Found this out the hard way when ordering a belt using my SN of 188k. The belt was too short and luckily I was able to return it for the longer version (SN > 196901). Thought my vehicle had been modified at some point but not so sure now.
- HoveringHMMWV

 

[Retiredwarhorses]

Found this out the hard way when ordering a belt using my SN of 188k. The belt was too short and luckily I was able to return it for the longer version (SN > 196901). Thought my vehicle had been modified at some point but not so sure now.
- HoveringHMMWV

many m1123’s were reset, they could have gotton whatever serp setup they put in between the 2.
early or late style regardless of SN range. But for the most part, 99-2000 you will see the early.
ive even seen early early ECV M1113 with old style.

 

[HoveringHMMWV]

My M1097A2, in the 188k SN range, has a GEP installed. Could that have made a difference? Or is it more like firearm production where receivers may or may not match barrel dates?
-HoveringHMMWV

 

[Mike1966]

Working on a 2009 AM General Humvee ECV M1165A1 Serial # <310,000. I've been looking at this post and saw the diagram but can not find any additional info on the remove/install new SERPENTINE BELT Geared Fan Drive procedure. I'm pretty sure I have the right belt - thanks to this thread, but I'm curious as to the crankshaft to geared fan drive feature. I would figure that per design they would enable a field guy to change out the belt by removing the allen screws going into the crankshaft drive pulley, and remove spacer, with the drive gear sliding towards the fan drive, giving you enough room to slide in the new belt, slide very thing back, and tighten. I have not started beating on it yet as I'm sure someone here has changed a serpentine belt one of these beasts.

 

[Coug]

Working on a 2009 AM General Humvee ECV M1165A1 Serial # <310,000. I've been looking at this post and saw the diagram but can not find any additional info on the remove/install new SERPENTINE BELT Geared Fan Drive procedure. I'm pretty sure I have the right belt - thanks to this thread, but I'm curious as to the crankshaft to geared fan drive feature. I would figure that per design they would enable a field guy to change out the belt by removing the allen screws going into the crankshaft drive pulley, and remove spacer, with the drive gear sliding towards the fan drive, giving you enough room to slide in the new belt, slide very thing back, and tighten. I have not started beating on it yet as I'm sure someone here has changed a serpentine belt one of these beasts.

According to the manual, before you are supposed to have the geared fan driveshaft removed to do the belt replacement.


Looks like 14 bolts and 4 grease fittings need removed to pull the shaft out. I don't personally know if there is a way to do it with just some of the bolts removed, but if there is enough room to slde the shaft out of the way without removing all of them, you'll likely figure that out during the removal.

 

[Retiredwarhorses]

You only have to remove the 4 bolts holding the GFD CV on the engine side attached to the crank pulley coupler plate…

 

[Mike1966]

You only have to remove the 4 bolts holding the GFD CV on the engine side attached to the crank pulley coupler plate…

Got er done. Thank you !!

 

[Mike1966]

Thank you all again. USBP Retired.

 

[DREDnot]

Here's a little gem I found in an old PS magazine... Covers the weird mishmash of serpentine belt sizes

 

[Guyfang]

Please submit this on the TM upload forum. I will try and find a place for it. Great info.

 

[Godspeed131]

Also, to just add another option out there is Dayco 5081125. It crosses over from the 3030-01-488-5606 NSN, for the 196901 and above S/N’s. I used it for my 1152a1 and its worked great so far.

 

[DREDnot]

Found this informative video that explains serpentine belt part numbers.
Very helpful to find just the right belt for your application if the "standard belt is too long or too short

Serpentine Belt Numbers Explained: Never Get Sold The Wrong Belts Again! - YouTube

 

[DREDnot]

Dayco belt specs page that covers 8 rib hmmwv lengths