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WATER PUMP RED 6

I recently had slight overheating in my HG 186 Ute. The light came on when I idled while parked on a very hot day.
I removed the thermostat and checked that it worked correctly I replaced it anyway. I then removed the water pump as I had 2 NOS ones in my spares. Both the water pump and thermostat were replaced along with a clean out and new coolant added about 10 years ago. The water pump I used at the time was the pressed steel after market type. I know that they are useless at idle on hot days or while stuck in traffic. It was still in good nick with out any corrosion on the impeller. The 2 NOS ones are not HG, they are the later type with the longer housing and spindle which I guess is HQ and later? Not sure? I refitted the old pump along with new coolant.
My question is does anyone know where you can buy a New Water Pump with the old cast impeller? As far as I know no one is doing them anymore?
Thanks in advance.
Ron

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Hi Ron, as far as i know the cast impellers aren't available anywhere, there was a few kicking around on ebay a while back, maybe check there, its possible to remove the cast impeller and fit it to the new pump i am told, though i haven't tried it myself. also swap meets, i have picked up 3 cast ones in the last few years at swapmeets

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Thanks fx48_eh64. I have a couple of later ones for swaps?
Cheers
Ron

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1948 48 215

I just had a look on Ebay and found this one on the link below. I contacted the seller and he assures me it is correct for my 186 at 78mm deck height? I'll check mine later but I think that's about the right height?
Cheers,
Ron

https://www.ebay.com...

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1948 48 215

It’s always a good idea to drain the engine block of water and cooling fluid as there may be slug or other objects inside the water jacks and flush through
This was one of my problems with over heating
I run a TPI Chev and I live in Cairns Nth Qld

You could always go for a electric water pump ? Just a thought, it worked fine for me

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As I always say
Stay safe all

"just my 2cents worth"

"were going to need a bigger shed"
trippled75@yahoo.com.au
This will take You to" Old Holden sheds"
https://web.archive....

I was going to suggest Ron - how clean is the engine block ? They can get quite fouled up esp if quite old..I've used plenty of after market pumps - different impellers but haven't had a problem with over heating other than some cheapies leaking..If your radiator is clean and it's over heated at idle then something else is def marginal...air flow from the fan, cooling restriction within block...maybe the pump impeller is sub optimal as you suspect - I haven't encountered that...she would have been pretty hot for the light to come on...I think 125deg? when the temp switch closes...if you had a gauge you would have been panicking for ages...ignorance is bliss!

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Andrew

auto surplus has the impellers in cast type
going by your discription i would suggest you get the
radiator cleaned
amazing how people replace everything but dont get the radiator cleaned i use to work doing radiators and the amount of times people would put a reco engine in and not service the radiator
the steel impellers dont work as well as the cast ones but should still be enough to keep the coolant flowing in the system
be sure you also get the right hub size theres a small hub on the earlier reds yours has mostly likely got the large hub

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I've met many people who think a hose down the inlet cleans the cooling system.
A bloke at work recently had trouble with his Patrol. It was fine around town but it got hot on the highway.
I told him it was probably just the radiator needed a professional clean. I said to take it to a radiator shop to get a flush and clean.
He said it was the head gasket. He had already done the water pump and thermostat and flushed it at home, so it must be the head gasket.
He paid a local mechanic $1,800 to do the head gasket and they didn't put the bottom hose back in properly, which resulted a in a split hose. When they fixed that it still got hot, so he went to fair trading because they hadn't fixed the overheating.
In the end an independent assessor said the cause of his problems was a blocked radiator.
So, after 4 months and almost $3,000 in the end, his cooling system was professionally flushed and the radiator serviced. It didn't overheat any more.
He still says he had to go through fair trading because the mechanic didn't fix the overheating.
David

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Old is good.

The cooling system is clean after removing the plug on the block in front of the starter motor and back flushing out of the thermostat housing as well as back flushing the radiator. I have done this many times. The engine wasn't 'cooking'. The light came on at idle when I parked on an extremely hot day. I have cleaned red and grey motors with caustic soda many years ago and I know about the sludge at the back of the block. After it was clean I would put a bottle of vinegar in it to neutralise the caustic soda. I often knocked out the welch plugs too just to make sure and to fit brass ones. Many times nothing would come out of the drain due to excessive sludge! I will also check the sender unit.
Thanks for all your replies.
BTW I have a mate who used to own an astra. It started leaking coolant. His mechanic told him the head was shot and needed an overhaul. About $5k later it was as good as new. But not long after that it started using coolant again. This time it was one of the welch plugs on the side of the block right under the manifold! The employed mechanic who did the job was sacked by his boss for not doing them while it was apart as it is a lot of work just to pull it down again. To this day we don't know if the head was the real problem as it was running sweet before he went to the mechanic? The car is long gone.
I have to order that water pump......

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1948 48 215

I just bought 2 of those cast impeller pumps on Ebay. One for the Van and One for the Ute.
Cheers,
Ron

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1948 48 215

Ok guys
Question
Is the cast pump or the Al pump better
I can understand why you would want to have a cast impeller But what about the pump itself
I have a full cast pump on my Chev and touch wood no problem so far 😎

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As I always say
Stay safe all

"just my 2cents worth"

"were going to need a bigger shed"
trippled75@yahoo.com.au
This will take You to" Old Holden sheds"
https://web.archive....

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