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I have had consistent overheating with my BN6 since I bought it. On a hot day 24 degrees C plus and in slow traffic (or prolonged idle) the car heats up to over 195 degrees F plus. I have replaced the old original radiator with a new modern core from AH spares and also fitted an electric Kenlowe fan which has improved the situation but not resolved it completely.
I checked all the other usual suspects of fan blade fitting, ignition timing and carb mixture but all seems fine In desperation I removed the water pump and found what I consider a fairly "large" (by impellor standards) gap between the impellor vane and the body (1.5 mm) as the attached photograph shows. The AH workshop manual does not provide any detail on what the gap should (although for the later AH 3000 pump they advise a gap of 0.5-0.6 mm which is what I would have thought the correct gap to prevent recirculation of water around the pump and ensure efficient pumping.
Before I strip the pump and cost to replace bearings and seals I wondered if other members could advise on their experience with BN6/4 pump impellor vane clearances and if my pump is correctly fitted or requires to be stripped and refitted to a closer clearance (if that is possible)?
Many thanks
I checked all the other usual suspects of fan blade fitting, ignition timing and carb mixture but all seems fine In desperation I removed the water pump and found what I consider a fairly "large" (by impellor standards) gap between the impellor vane and the body (1.5 mm) as the attached photograph shows. The AH workshop manual does not provide any detail on what the gap should (although for the later AH 3000 pump they advise a gap of 0.5-0.6 mm which is what I would have thought the correct gap to prevent recirculation of water around the pump and ensure efficient pumping.
Before I strip the pump and cost to replace bearings and seals I wondered if other members could advise on their experience with BN6/4 pump impellor vane clearances and if my pump is correctly fitted or requires to be stripped and refitted to a closer clearance (if that is possible)?
Many thanks
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