4 replies to this topic

[BigDave99]

Hello

Just fitted a new engine to my 1995 1275 SPI mayfair, i put in a 1275 metro carb engine! Got everything going and works lovely, one big problem - at idle she overheats very quickly! when investigating the pproblem with hose pipe and a hose i found that the water pump does not pump the water around at idle. as soon as the engine is revd and then held at a higher rpm the water flows fine. if you then drop it back down to idle the flow stops! Obviously a big problem when sitting in traffic! Why could this be? Could the rad be blocked and then only at a higher rpm does it suck the water out and round?

All suggestions welcome and appreciated!

Dave

[minicooper1.3i]

Have you checked the fan belt? For wear and correct tension? And how old is the actual pump? If the belt is OK see about getting a new pump and flushing coolant out / through. New pumps aren't all that pricey or difficult to fit.

[pantera2075]

I'd definitely get a new pump on it, and a new thermostat.

Cheap plastic impeller pumps regularly loose their fixing onto the impeller, and on a very old metal one the blades can rot away.

Also, a smaller water pump pulley could help if you are currently running a large one.

[BigDave99]

Water pump and belt are new, tension is fine! Im stumped, i flushed the whole system too!

[mini_kel]

Is it the correct pump?? As mentioned there are pumps with smaller impeller!!

Edited by mini_kel, 17 July 2008 - 06:08 PM.