6.7 P-Pump Conversion with Pics - Page 7 - Dodge Cummins Diesel Forum
07.5 - 09 3rd Gen 6.7L Performance Parts Discussion Discussion of Performance Parts For the 6.7L Trucks...NO ADVERTISING

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post #73 of 93 (permalink) Old 08-24-2015, 03:37 PM Thread Starter
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These are pictures of the air compressor oil lines. Prior to starting up the motor, I primed the oil system with a pressure tank.

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post #74 of 93 (permalink) Old 08-24-2015, 03:53 PM Thread Starter
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I needed a way to drive my gear type fuel pump. I also needed a pulley to replace the original power steering pump. If I didnít have a pulley where the power steering pump went, there would not be enough belt engagement for the fan pulley and the fan would slip. So I decided to kill two birds with one stone. The following several posts will show how I added the mechanical fuel pump.

To start with, I needed some sort of bearing housing to support a pulley and belt. The perfect option was a water pump because it already has bearings and a way to mount it. The one I picked is very cheap ($28 new on eBay) for a Ford pickup 2000-2010 5.4L.
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post #75 of 93 (permalink) Old 08-24-2015, 04:11 PM Thread Starter
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The pump I used was from a military M35A2 truck. I can get these pumps dirt cheap. It is designed to run at a 1 to 1 ratio with the engine. Because of that, I needed to use a pulley that was the same size as my crank pulley. It was very difficult to find a pulley that fit the bill. What I found was a new takeoff pulley from a semi-truck ($69 on eBay). The pulley is from a Cummins ISM M11 engine. The pulley was just slightly smaller than my crank pulley. This will overdrive my fuel pump, but only by a tiny amount.

My next step was to pull the drive hub and impeller off the pump and machine the drive hub to fit the M11 pulley.
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post #76 of 93 (permalink) Old 08-24-2015, 04:16 PM Thread Starter
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Here is what the pump and pulley look like with the hub pressed back on and the pulley bolted on.
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post #77 of 93 (permalink) Old 08-24-2015, 04:51 PM Thread Starter
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Ideally, the pump will be facing forward, but the direction I need the pump to turn requires the pump to face rearward. I looked into reversing the flow of the pump, but it is impossible. This makes for a difficult bracket design for the pulley. This is the first part of the fab process for the pulley bracket.
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post #78 of 93 (permalink) Old 08-24-2015, 04:55 PM Thread Starter
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I needed to thread the pump housing with helicoils. It turned out that the holes were a perfect size to use 3/8-16 inserts without the need to drill.
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post #79 of 93 (permalink) Old 08-24-2015, 05:01 PM Thread Starter
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These are pictures of the bracket welded and test fitted. By the way, the pulley location was driven by the fan. I needed the pump to be out of the way of the fan. I also needed to go with the next size belt which happens to be about 6 inches extra in length. The belt came from a Ford 6.0 diesel.
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post #80 of 93 (permalink) Old 08-25-2015, 09:56 PM Thread Starter
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Next step is to mate the pump to the pulley. Pictured is a pump from a M35a2. All I had to do is get a set of lovejoy couplers to couple it.
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post #81 of 93 (permalink) Old 08-25-2015, 10:10 PM Thread Starter
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All I have to do is make an adapter. Time to break out some solid aluminum stock.
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post #82 of 93 (permalink) Old 08-25-2015, 10:12 PM
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HOLY CATS!!! you are doing some amazing work in this thread. as you stated, its probably not the best idea to ppump a 6.7, but god damn, you are making that engine your b!tch!

'02 2500 ECLB, 4x4, NV5600 tst comp/ts mvp, SO VP44, FASS 150, 7x.012's, ARP Studs, 64.5/68/14, Kenny's triple disc, 110# springs. 298k miles.
'02 RCLB, rwd, auto. bone stock
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post #83 of 93 (permalink) Old 08-25-2015, 10:17 PM Thread Starter
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These are pictures of the adapter being completed. Maybe when I grow up, I can be a machinist.
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post #84 of 93 (permalink) Old 08-25-2015, 10:32 PM Thread Starter
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Quote:
Originally Posted by ganzey View Post
HOLY CATS!!! you are doing some amazing work in this thread. as you stated, its probably not the best idea to ppump a 6.7, but god damn, you are making that engine your b!tch!
Thanks bro... It really is a pain to p-pump the 6.7, I didn't really have to create a mechanical gear type fuel pump. I could have just used an electric pump. However, with an engine driven fuel pump, I don't have to worry about an electric pump going bad or have to pay top dollar for one.


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