Hello! New guy here, 6BT questions - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 01-28-2010, 05:19 PM Thread Starter
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Hello! New guy here, 6BT questions

Hi everyone. My name is Ted. I work at Krawltex Motorsports, a 4x4 shop in Austin, TX. I am not a diesel expert, but our shop specializes in motor swaps and drivetrain conversions. We are building a 1991 Chevy Suburban with a 6BT for a customer. I have found this forum to be very helpful, lots of good tech here. I had a question or three, and also wanted to share some pics of the swap and open up for any suggestions.

Here is a link to our website with some pictures:


The Burb started as a 2500 model, with a TBI 350, auto trans (4L80 I believe) and NP241 T/case. We ditched the 10 bolt front and s/f 14 bolt rear axles in favor of a FF 14 bolt with a Detroit Locker and a Dana 60 with and ARB. We also installed lift springs for the front, and a shackle flip kit in the rear. The engine came from a 1992 Dodge 3/4 ton pickup. We installed a Chevy NV4500, modified with Dodge Bellhousing and input shaft.

The first question I have. As far as I can tell, this 6BT does not use glow plugs, but instead has a preheater in the intake manifold. Does anyone here have any recommendations/suggestions as to how to wire this preheater? I know the Dodge factory PCM will control it, But I am trying to eliminate the PCM. I was planning on using a momentary switch.

We are getting very close to having this thing running. Any input would be greatly appreciated.
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post #2 of 4 (permalink) Old 01-29-2010, 02:52 AM
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Honestly, a lot of people gut them and leave it alone. Unless it is really cold where you live, it won't be a problem. The only way I can see would to have a push button that you hold down, like the real old diesel tractors had. The PCM uses the signal from the IAT sensor (Intake Air Tempreture sensor) to control the grid heaters, so without it you are going to have to get creative.

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post #3 of 4 (permalink) Old 01-29-2010, 03:26 AM
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Welcome to the Garage! That looks like a very nice conversion.

I would gut it. I'm removing the IAH from my ISB soon. Tomorrow is the final test as it is supposed to be 14 in the morning.

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post #4 of 4 (permalink) Old 01-29-2010, 03:35 AM
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Use the intake air temp sw to close a relay that enables a push (momentary) switch - it is a retail conversion and may see cold weather. If it will see cold weather add a latching relay so the grids work until the key is turned off.

Your location will only see a couple of min of white smoke on start when it is below 60 F, mine smokes about 15-20 sec in the low 30's if I don't let it cycle. Others have commented on starting to 0, but not on smoke - I picked up a fix-it ticket with a Cat 3208 in Colo Spgs for white smoke from moving out to soon in -10 f weather.

The electrical draw loads the alt as well as heating the intake to control smoke.

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Last edited by keydl; 01-29-2010 at 03:50 AM.
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