Where to from here...?

Range Rover Classic
3.5 on Lpg
Put new exhaust system on, then first start the vehicle overheated, drained coolant, flushed radiator, new thermostat, new temperature sender...and it still over heated...
So I decided to pull the water pump off....

But the rotors appear fine!?

Now I have had this vehicle for a good 3 months, and it's never overheated, almost run a bit too cool.....until just recently

So any advice would be appreciated!!!

That's probably not the original pump, looks like the old one failed and the impeller played ping pong in the housing..

Has the new exhaust got too much restriction, that will cause overheating, can you try it without silencer?

freelance said:

Has the new exhaust got too much restriction, that will cause overheating, can you try it without silencer?

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Well that would be a first

discool said:

Well that would be a first

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I doubt that, funny the overheating occurred when new exhaust was fitted, we’ve thrown away silencers for restricting performance

It's got 1 hot dog silencer, and we cut some ugly restrictive repair bits out of the section b4 the Y, and then installed a 2.5" rear section that we had pre bent up.........so definitely not restrictive!!!

That's the bit that gets me is that it decides to do it now......I could accept that the water pump is inefficient if it had always run hot but it's always run pretty cool.....

Trailstar said:

Range Rover Classic
3.5 on Lpg
Put new exhaust system on, then first start the vehicle overheated, drained coolant, flushed radiator, new thermostat, new temperature sender...and it still over heated...
So I decided to pull the water pump off....

But the rotors appear fine!?

Now I have had this vehicle for a good 3 months, and it's never overheated, almost run a bit too cool.....until just recently

So any advice would be appreciated!!!

Click to expand...

Well the damage to the pump housing shouldn’t have happened, obviously that damage can only be done by the pump. It looks as if there wasn’t a gasket and just red sealer was used, so that would have placed the impeller closer to the housing, or of course an iffy pump bearing allowing the impeller to wobble but that’s something u would hear.

So if the impeller is slipping on the shaft ie become detached and isn’t turning, therefore no coolant circulation within the engine, the engine will overheat. If not slipping look else where.

freelance said:

I doubt that, funny the overheating occurred when new exhaust was fitted, we’ve thrown away silencers for restricting performance

Click to expand...

The exhaust replacements on my 3.5 were always genuine Land Rover, so never had any issues, even though both boxes only lasted two or three years and then required replacing.

Water pump looks like it’s been cavitatiing, did you drain coolant to fit exhaust, and not bled properly, or it’s pumping compression gas straight in there from head gasket failure