Improve Coolant Flow at the rear of the block!

Bobcat698

Bobcat698

Pure Diesel Power
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Install the rear plate(8) marked & o ring(9) in the diagram, then using heater hose I plumbed the hose into the heater core return line (the hose that leads down towards the oil filter). You will also need a 90 degree fitting and a plug to cap the other port.

This will eliminate the possibility of blowing the rear freeze plug and also help coolant flow along cylinder #6. The rear freeze plug is under a LOT of pressure.. I managed to blow 3.5 gallons of coolant out this port when the hose blew off.

On some trucks, you may need to grind the plate to allow it to clear the bell housing.

You can do this with the cylinder head off.
It isn't fun, but is definitely do-able!

I wouldn't attempt it with the cylinder head on, but maybe it could be done, I'm not sure.
 
Signature600 said:
How do you get the back freeze plug out?? Can't seem to get it by prying it out!

Chris
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Are you doing this from the top of the engine? OR From behind with the tranny out?
 
Garrett knows how to get it out!!! It is a pretty sweet setup and keeps that back cylinder a lot cooler than stock.
 
BigBadDodge said:
The EEP kit also works very well and is plumbed into the top radiator hose.

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BBD
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So that plate is bolted to the back of the block and takes the place of the freeze plug?

Joe
 
i put this plate in last year, it made a difference. The down side of the thing is that your heater is not near as hot!!!! Thats the sucky part. I drove 10 hours in my Carhartts to northern Wisconsin. But the upside is that the coolant flow was not hindered at the back of the block anymore
 
366ci_cummins said:
i put this plate in last year, it made a difference. The down side of the thing is that your heater is not near as hot!!!! Thats the sucky part. I drove 10 hours in my Carhartts to northern Wisconsin. But the upside is that the coolant flow was not hindered at the back of the block anymore
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I don't understand why you didnt plum it to the bottom of the thermastat houseing area. There is a 1/2npt plug on the bottom that could be removed and replaced with a reducer. (Instead of routing to the return hose.) That way you wouldn't be going around thermastat and the motor/heater would get to temp. Was any concern given to lowering the flow rate inside the head coolant cavities from this mod?
 
Not to but heads with you Opie, but I'm a bit confused by your statement. Are you saying that without this mods, no coolant is circulated before the t-stat opens? Cummins manual says otherwise (small amount of coolant is bypassed, and circulated to avoid hotspots)...I'm not sure why this would affect heater operation.

I ran this kit from the rear of the block, to the heater core, through my water cooled charger, to the auto tranny heat exchanger, and then to the lower radiator hose/water pump inlet.

Just asking for clarification...I could be confused:D
Chris
 
What? lol

The pic shows the new coolant line is bypassing the thermastat and Teeing into the return hose. 366ci said that his heater is not near as hot. Seems to me that this mod would decrease lower coolant pressure in the engine from the water pump/lower the amount of coolant being returned through the passageways. The freeze plug in back of the engine is in back of the #6 cylinder sleeve. Pretty much all the sleeves are in a common bath sort of speak. While the sleeves do get hot my belief is that the cylinder head is what requires more attention. And by adding a external return line in it above cylinder 6 it would still lower coolant pressure and do more controling heat. The casting of the head stinks in that area, there is a small freeze plug I tapped and will be running a steel line from. So I have a similar goal in mind but as stated before l routed my return so that it is below the thermostat housing. Also there is a pretty big restriction of air in the plenum to #6, or there used to be in mine anyway.
 
Oh...OK. I never looked at the pic above. My bypass comes off the rear of the block, and after running through some accessories, it returns to the bottom radiator hose!

That should negate the ill effects your thinking of...shouldn't it?

Told you I was confused!
Chris
 
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