Does anyone know the cooling system capacity on an 86 IDI thanks.

 

what motor hit it with a hammer

 

Most are 32 qt's or litres that is a 50/50 mix of Antifreeze and distilled water (plus some SCA for a 7.3 only)
If you do not have the coolant plugs on the side of the block replaced with drain valves there will be about 2 gallons of old fluid retained after draining.

BajaGringo Block Drains

The block drains are just 1/4"npt pet*****, available in the "HELP" section at the auto parts store. You need a 9/16" crowfoot socket that fits on a socket extension to reach in to tighten them (There's no room for a reg open end wrench). Then, cut up an old spark plug socket to fit over the petcock to loosen/tighten. Once they are loose, slip the 3/8" rubber hose over the end of the petcock and continue loosening the petcock (with the other end of hose in bucket). Intstalling these is still messy and a bit of a hassle, but NEXT TIME it'll be a lot less messy and a lot easier. Smear 'em with anti-seize to make sure they turn 'next time'. I've already had to use mine because when I had the radiator 'rodded' they didn't have the right kind of antifreeze, and I was 200 miles from home. So I needed to re-flush the system and re-DCA it. This makes saving/reusing the expensive DCAs/antifreeze possible if you use CLEAN BUCKETS. I bought a special funnel that snaps into the radiator fill, and use a metal spray paint funnel/filter/screen just to make sure nothing too big gets back in there. BajaGringo
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Thanks PLC7.3 I new you would know I need more than a 50-50 mix though if I'm thinking right that is good for 34 below I want at least 50 below.
I thought you use sca in the 6.9 too we use it in all our big diesels.

 

I use SCA in my 6.9, always have.

 

whats sca? my rad is really rusty buy the filler neck on the inside