Coolant pump addition to my vegistroke

19856 Views 46 Replies 22 Participants Last post by Clay Henry, Jul 12, 2016

Clay Henry

Discussion Starter · Dec 12, 2008 (Edited)

I was seeing lower than comfortable coolant temps in the return coolant loop so i did a little research and decided to add this little mercedes aux coolant pump. Apperantly on the 6.0s, the coolant flow is less than with the 7.3s - or at least thats what i am hearing from other 6.0 conversion owners. The coolant loop is taped in where the feed line to the hater comes off the water pump and returns to the line going to the de gas bottle. The loop runs back to the tank, thryough the tank and returns to the engine bay so there is a fair amount of hose in which to loose heat through if the flow is to slow.
I paid i think 60 bucks for the pump from Mercededsource dot com
You can see its pretty small.

I removed the inercooler pipe to the turbo to gain access to the coolant "t". Disconected the loop connection to the "t".

The inlet and outlet on the pump form a 90 so this worked well for this location.
I added 5" of hose to the inlet from the "t".

I have no heat loss in the loop now so my vegi tank and Module are staying much warmer.
I cut the plug off this pump and ran a ground to a nearby bolt and ran the other wire to a switch in the cab and powered it off a keyed 12v source so The switch will be to turn it off in the summer when heat is n ot an issue, the rest of the time the switch is left on and it comes on with the ignition.
I tested this pump before instal and it pumped a 5 gallon bucket empty in 2 minutes so it is moving coolant alot facter than before keeping the heat up.

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AFBLUE

· #12 · Dec 13, 2008

hheynow said:
Clay nice idea using the pump and great photos as well. I think I see a problem with your coolant plumbing and you can generate more heat if you re-plumb the flow. The hottest coolant is the hose coming out of the head. That's where my tee is and that very hot coolant travels through my components. My coolant return is a tee to the hose going to the water pump. If your hottest coolant is tee'd to the hose to water pump you're missing out on a few degrees of free heat because that's the coolant return line.

$.02 :icon_ford:

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AFBLUE

· #13 · Dec 13, 2008

hheynow said:
Clay nice idea using the pump and great photos as well. I think I see a problem with your coolant plumbing and you can generate more heat if you re-plumb the flow. The hottest coolant is the hose coming out of the head. That's where my tee is and that very hot coolant travels through my components. My coolant return is a tee to the hose going to the water pump. If your hottest coolant is tee'd to the hose to water pump you're missing out on a few degrees of free heat because that's the coolant return line.

$.02 :icon_ford:

He was saying that the 6.0 is plumbed different than the 7.3s OBS and superduty. So yes I agree on your truck and mine the hotest coolant is out of the block line then return to the pump. On the 6.0 the heater core return goes to the degas bottle and not the pump. So whether it may not be as hot or as much flow as us, alll he has for a heat source is the line off the water pump.

These Mercedes pumps are solid. My father had to add one to his 82 Mercedes grease pig for the same reason, Mercedes flow very little coolant at idle so one of these pumps is used for the heater hose application specifically to be able to draw heat into the car at idle.

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AFBLUE

· #17 · Dec 13, 2008

by looking at your picture its pulling from the vegi cold side, do you think there is an issue with the pump pushing coolant backwards through the heater core at the tee to the hot side?

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AFBLUE

· #21 · Dec 15, 2008

CHenry said:
You are confused. ITs taking water that comes from the water pump, on its way to the heater core and its pumping it through my coolant loop and back - you can't see the return line but it goes to the de gas bottle. The inlet tube is pointing at the engine, the out let is pointing to the rear.

Got ya, I was getting it mixed up with my setup, and crossed in my head which way the pump was pushing. So if your vegi return is in between the cold heater core line and degas bottle, the path of least resistance is to the degas bottle, and not backwards through heater core to the hot side. Probably if anything, you may have lost a little flow through your heater core, but same for me too, Vegi getting heated is more important than me getting heat in the cabin. :thumb:

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AFBLUE

· #23 · Dec 15, 2008

CHenry said:
Well this little pump did not prove to be a good one. The heat from the coolant warped the inlet and outlet pipes and they started colapsing and leaking...I will contact the people i bought it from and hopefully they will have some insight as to why a "coolant" pump didnt hold up to the hot coolant.
Maybe i jusat got a bad one?

Ehh I cant say that one would be bad, its probably that all those pumps cant handle the hot side, if you can get another one for free, put it on the cold side.

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