Fresh Water Heater Higher than Engine

[JPT]

Hi, I have 30l size fresh water heater located higher than the engine. It has connections to cooling water">engine cooling water system. The engine is Perkins 4108 and having no cooling water conservator. If I do the connection what is important to notice?

Thanks in advance to any comment you may have!

[atoll]

4108's reservoir is part of the exhaust manifold heat exchanger assembly i belive.

if calorifier higher than the engine a second coolant reservoir is required at the highest point of the system and most be filled with the engine water circulating otherwise it will air lock.

[JPT]

I presume that the calorifier is the hot water heater? If I remember right the engine cooler manifold is having small rubber hose which I presume works as a overflow for fresh water cooling side? As the heater is above the engine the cooling circulation has to be closed below the highest point?

[atoll]

yes calorifier=water boiler/heater.

there should be a radiator cap for filling where the small tube comes from?

[zeehag]

took ou t my hot water heater, should i change my radiator cap?? has a tube looking exit thingie.. no overflow tank or other catchment device.

[atoll]

Perkins 4-108 Water heater plumbing good thread here.

zeehag you should not need to replace the rad cap,un less it leaks.

http://www.cruisersforum.com/forums/...bing-9594.html

[zeehag]

ty!!!!!!!

[JPT]

So if I remember the rubber hose existence correctly I need to close it otherwise the cooling water that located above the hose will come out through it? My understanding is that connection to the heater should be taken just after the engine cooling water pump and then circulated through the heater back to engine. Where the overflow tank should be connected?

[atoll]

the radiator cap is spring loaded so will not overflow unless the water boils.
not sure where you should loop into the circuit but check with perkins.
the higher reservoir only needs a tee into the loop so that any air will find its way to the top of the closed loop.

this reservior allows for expansion and evaporation and prevents air locks.

ps read the other thread
http://www.cruisersforum.com/forums/...bing-9594.html