OW,

Quote:

"My 602 doesn't use coolant. I just replaced all the hoses at the thermostat, all were fuel lines. "

[Then you've nothing to worry about...Your "Head" will warp within ten minutes...
And then you can move on to other pursuits.]

The other end of those Thermostat fuel lines (That dis-appear under the Intake)
Connect to the Coolant/Fuel Heat Exchanger,which is plumbed into the Coolant
System.

Part # 233 is the Heat Exchanger.
Part # 245 is the o-ring.
Part # is the securing clamp.

Attached Thumbnails

 

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'84 300SD sold
124.128