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Unit3 
Orange Level
Joined: 17 Oct 2009
Location: NC Iowa
Points: 5594
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 Topic: A "BIG AL" Question
Posted: 06 Jan 2022 at 11:44pm |
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With a 844 in a semi, how was the air pump run? Was it a gear driven or a belted?
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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DiyDave
Orange Level Access
Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 54029
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Posted: 07 Jan 2022 at 4:34am |
Looks like belt driven compressor, off same belt as WP. Scroll down in this old thread, for photos... 
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ACjack
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Joined: 13 Sep 2014
Location: Peoria, Arizona
Points: 275
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Posted: 07 Jan 2022 at 9:45am |
It was belt driven from the fan blade pulley and not from the water pump belt. We were building engines for both Frightliner and Kenworth. There were minor differences between them and on some of the engines the air compressor was mounted on the LH side instead of the RH side.
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Unit3
Orange Level
Joined: 17 Oct 2009
Location: NC Iowa
Points: 5594
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Posted: 07 Jan 2022 at 11:27am |
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I saw just yesterday one of the gen sets with the Mt. Everest 25000 engine. Makes you feel sorry for the 8550 or 4w305 to hold one of the engine blocks up.
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2-8070FWA PS/8050PS/7080/7045PS/200/D15-II/2-WD45/WD/3-WC/UC/C
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DougG
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Joined: 20 Sep 2009
Location: Mo
Points: 8334
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Posted: 07 Jan 2022 at 11:30am |
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No kidding there = those things have to weigh close to 5000 lbs ,,
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8070nc
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Joined: 21 Mar 2019
Location: North Carolina
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Posted: 07 Jan 2022 at 12:36pm |
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I have one on a AC DES 300 genset. It has a bosch p pump mounted directly on the timing case up high. Its the only one I have seen that didnt have the injection pump low with a drive shaft
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 87553
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Posted: 07 Jan 2022 at 12:37pm |
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Like them all, but love the "B"s.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 54029
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Posted: 07 Jan 2022 at 5:53pm |
 ACjack wrote:
It was belt driven from the fan blade pulley and not from the water pump belt. We were building engines for both Frightliner and Kenworth. There were minor differences between them and on some of the engines the air compressor was mounted on the LH side instead of the RH side. |
I was going from what I saw in Steve's picture, from the old post I linked to. I stand corrected! 
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