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Old 03-15-2016, 02:27 AM   #1
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Op Temp for Cummins 8.3lt

Hi - I would like to know what the correct operating temp is for a Cummins 8.3lt mechanical turbo after cooler diesel engine (6CTA) is. Hooked up to an Allison MT643 - 4 speed. This configuration is installed in a motorhome. I am buying all new gauges and want to make sure I get correct ones.

Also I would like your thoughts on what is a good coolant level indicator for this engine would be. Thanks
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Old 03-15-2016, 02:03 PM   #2
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Welcome to iRV2.

Many older coaches, mine for example, have a gauge package that is unique to the chassis manufacturer, and the wiring and sensors won't adapt to any aftermarket gauges.
So if you could post info on your coaches year, model and chassis manufacturer, maybe the members can be more help.
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Old 03-15-2016, 05:09 PM   #3
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My experience with our mechanical C8.3 engine is an operating temperature of 185-190 degrees on the flats and up to 200 when pulling a six mile 6% grade (Fancy Gap).

This is with the stock VDO gauges supplied by Spartan/American Coach.

Transmission is the 6 speed Allison 3060. It runs around 10 degrees cooler than the engine consistently.
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Old 03-15-2016, 06:27 PM   #4
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When working for a public transit company, I had the job of researching and spec'ing new equipment to include bus diesel engines and operating parameters. At that time, 195 degrees was considered the optimum operating temperature for a diesel engine. Cooling system components to include radiator shutters were items considered to maintain the optimum 195 degrees as much as possible. Note, most OE thermostats are 195 degree units so that must be a pretty good target to try to maintain.
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Old 03-15-2016, 06:35 PM   #5
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My Old 8.3 runs at 190 deg and the Allison is not far behind @ 180 deg all day every day
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Old 03-15-2016, 06:51 PM   #6
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Quote:
Originally Posted by Skip426 View Post
Welcome to iRV2.

Many older coaches, mine for example, have a gauge package that is unique to the chassis manufacturer, and the wiring and sensors won't adapt to any aftermarket gauges.
So if you could post info on your coaches year, model and chassis manufacturer, maybe the members can be more help.
Thanks for the reply however your suggestion is not relevant to my bus. You see I have started from scratch. The bus has been stripped out. The engine, Tranny etc is not original. All wiring has been stripped out. The question now relates to the Cummins and Allison - Larry
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Old 03-15-2016, 07:34 PM   #7
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Expect that engine to run about 180* normally and about 200* or so on a good pull.
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Old 03-26-2017, 11:47 AM   #8
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Cummins 6CTA 8.3 Diesel Shop Manual

I would go with what the Cummins Shop Manual says. There are two different types of coolant thermostats used and two different radiator caps depending on your configuration. My 1993 American Eagle with a Cummins 6CTA 8.3 Diesel uses a 15# radiator cap and TWO 180° thermostats.

You can download the Cummins 6CTA 8.3 Diesel Shop Manual HERE:

http://www.drillcorp.com/contentms/m...%20engines.pdf

It will give you all the information you'll ever need.
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Old 03-26-2017, 04:06 PM   #9
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Quote:
Originally Posted by Inkbuddy2 View Post
I would go with what the Cummins Shop Manual says. There are two different types of coolant thermostats used and two different radiator caps depending on your configuration. My 1993 American Eagle with a Cummins 6CTA 8.3 Diesel uses a 15# radiator cap and TWO 180° thermostats.

You can download the Cummins 6CTA 8.3 Diesel Shop Manual HERE:

http://www.drillcorp.com/contentms/m...%20engines.pdf

It will give you all the information you'll ever need.
Ditto on My 92 !
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