maintenance time
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Mountain Pass
Joined: Nov 2016
Posts: 128
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maintenance time
I am getting ready to do a drain and refill of the cooling system and the transmission and was wondering if someone could tell me how much coolant I will need and if the transmission drain plug has a sealing washer that I need to replace. This is on a 2017 6.7 with the 6r140.
Cargo Master
Joined: Feb 2017
Posts: 2,418
Likes: 720
From: Wisconsin
Engine coolant (primary high-temperature cooling system loop) 35.1 qt (33.2 L)1 Engine coolant additive (primary high-temperature cooling system loop) 48 fl oz (1.41 L)2 Engine coolant (secondary cooling system) 15.1 qt (14.3 L)1
Yes, replace the sealing washer
Yes, replace the sealing washer
Cross-Country
Joined: Feb 2010
Posts: 51
Likes: 7
From: Fernley, NV
You won’t get the entire volume out with the radiator drain. With the primary cooling system you’ll be able to drain about 5-6 gallons. I typically drain until it stops, top the system with distilled water (+/- 5 gallons), run it up to operating temperature, drain again, fill with 4.5 gallons of the appropriate coolant - yours might want orange, or yellow; fill with what it had from the factory. With the secondary cooling system, you do the same, just add 1000 MF’s trying to get the drain open - only a 10 jointed midget would be able to open the thing easily. I change mine about every 50k miles, so don’t worry much about getting every drop out.
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