I have been trying to find out everything I can about the coolant bypass hose. While I have learned quite a bit, I still have questions.

Can the bypass hose be deleted without adverse effects? I believe the hose is there to constantly circulate coolant through the block and heads, is it correct? If so, can I remove that hose and reroute my return heater core hose to the water pumps bypass hose inlet?

Any insight and help is greatly appreciated.

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I just thought of something else. The main problem with this engines cooling ability is the rear of the heads, correct? If so, couldn't that be caused by the fact that there is no crossover between the heads in the rear?

How's this for an idea?

Drill a hole into each crossover blockoff plate and weld in a bung for 3/4" NPT. Then install hose barb fittings and a "Tee" that then connects to the water pump's bypass hose inlet, in turn changing the bypass hose from the front coolant crossover to the rear of the heads.

This is my new idea, and I think I may try it unless someone else can say that they (or someone they know) has tried it. In theory, it seems like it would be better to pull hot water from a lower flowing area than the high flowing t-stat area.

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A little more research shows (on another forum site) that Racer55 was considering something similar with the crossover plates a few years ago. And that a few other people have discussed it, but nothing became of it.

Anyone care to discuss this? Better off modified, right?

 

More research last night showed a company that still makes a kit with this in mind. I will probably be making my own to connect the plates to the heater core line off of the t-stat housing. I will be restricting the flow from the t-stat housing so that it will increase flow from the rear of the heads.

 

I thought of doing something similaR years ago, but never got to it. I think we were just going to run a line from head to head.

Doesn't SS diesel sell a kit that does something like this?

How do the lines run in the kit?

 

Drilling holes in the blanking plates is the go blokes are doing that over here in oz on these engine conversions work a treat.

 

I have them made and installed, but have yet to run the engine with coolant. I have a 3/8" rubber line coming from each head to a tee in the middle. the center leg of the tee runs under the intake and IP around to the passenger side port on the water pump.

 

Most folks who did the rear flow idea years ago returned the coolant to the heater core return line.