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Engine Coolant

Yahoo Message Number: 6904
Before you have your coolant changed, check your Dynomax Chassis Book Appendix for information of the type of coolant used in your coach.

I just had a coolant change and went to a propylene glycol based Cummins Compleat product after contacting CC Tech Support for specific information. They said I originally had a propylene glycol coolant, but I just happened to be perusing my Dynomax Chassis Book, and there it is -- IEG (Inhibited Ethylene Glycol) is specifically recommended for our coach!

I've contacted Tech Support for advice at this point. I think I know the answer.
Jon
#11020

Re: Engine Coolant

Reply #1 –
Yahoo Message Number: 6905
Hi Jon,

As I just stated in a previous message - all subjects repeat in about every 1000 messages.

For the complete story on Coolant you might want to look at msgs 5425, 5451,5456,5457, there are more.
Fred Kovol

[quote author=carvedturn" \.\>][/quote]

Re: Engine Coolant

Reply #2 –
Yahoo Message Number: 6906
I have spoken with Tech Support (14 rings after receptionist's transfer - hang in there!)re my recent coolant change and they said that a gallon of residual ethylene glycol in a coolant change would not make any difference with the propylene glycol. (12 gallons of propylene glycol were added. The system with Hurricane holds 12.5 gal, correct?) What say you? I'm still thinking a flush and new change would be the prudent thing to do. I have visions of coagulation or some such reaction occuring.

Jon
#11020

Thanks, Fred. Do you do your own coolant maintenence?

Re: Engine Coolant

Reply #3 –
Yahoo Message Number: 6908
Jon,

Ethylene and Propylene are both blue if Compleat is used, don't forget the water filter with the DCA4 additives, a baking soda wash is required, see my published procedure for your consideration - it's in the msg 5400 area. Read the procedures carefully in the binder that came with your coach. 10-15 gals depending on coolant reservoir and engine size. Do not use auto antifreeze.
Fred Kovol

Re: Engine Coolant

Reply #4 –
Yahoo Message Number: 6914
Fred, what is the difference between a baking soda wash and a flush of the system? Is the b.s. wash a familiar procedure in the service centers?
Jon

Cummins 350hp 8.3L

Re: Engine Coolant

Reply #5 –
Yahoo Message Number: 6916
Hi Jon,

I can give you the following parameters for a flush.
Complete drain after the coolant is below a max temp - dispose per local code. See coach binder or read my procedure for max temp before draining. Preparation is 90% of this job.
Refill with baking soda per coach binder mix using soft water only and run engine to temperature with the thermostat removed or use my procedure.

Drain after temp. is below a max. and refill with soft water and engine run to temperature and drain after below a max temp. If water is dirty, do another baking soda cycle followed by soft water fill and drain. Water must be clear.

Replace water filter with a DCA = 4 units.
Fill with 50-50 distilled water and Cummins Compleat concentate. P or E coolants are both toxic - I use Ethylene.
This is a 3+ day job if done right. Engine cooling is critical to prevent a warped head. My first time took four long days with the outside temperature over 85 deg F.
Fred Kovol

[quote author=carvedturn" \.\>][/quote]