follow up to 3.5 cooling

mickjo · Post by **mickjo** » Thu Jul 01, 2010 4:51 pm

Bodger, in one of his replies to my original post on overheating, stated to check the hoses

ie "check and make sure you havn't connected the hoes on the back of the water pump housing to the blanked off outlet .. on some there are 2 stubs pipes , only one is open ...

i only know becuse i did it"

Ive pm ed him and hasn't answered back, the point is scaring me a bit as the engine is still roasting hot but with a hot rad and blower.

The engines story:
My engine originally is stamped with a RR number but somehow was fitted to SD1, with the appropriate SD1 water pump housing+pump. This SD1 pump only has one hose connector on the back.
The engine was remover from the SD1 stripped and rebuilt for the purpose of going into a Land Rover, a RR water pump housing +pump fitted that has two hoses connected to the back.

So, I need for the sake of my own sanity to understand the impact of the 1,2 water pump hoses. as bodger indicated.

Mick

SuperV8 · Post by **SuperV8** » Sun Jul 18, 2010 4:51 pm

They are both inlets. One is a bi-pass so when the thermostat is closed you still get water flow circulating through the engine, the other is the heater matrix return.

The only reason I can think for there being one inlet pipe is if the heater matrix has no valve to stop flow, just a flap to redirect the air flow so then this would also act as the bi-pass.

Tom.

unstable load · Post by **unstable load** » Mon Jul 19, 2010 5:57 am

Like Super says, the pipe on the back of the front cover is a bypass for the 'stat and goes to the manifold while the one integral to the pump body is the heater matrix. If you have the standard manifold then you should loop connect it to the pipe on the back of the manifold if you are not using the heater matrix so it can still flow the coolant in the manifold.