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8N not pumping water after new head gasket?


 
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K5_489
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PostPosted: Sun Jun 07, 2020 2:31 pm    Post subject: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

New to me 8N, side mount distributor. Seemed to run without issues when I tested it in POs yard. Got it home, started dragging the yard, and noticed it steaming out of the rad cap soon after. Figured cap went south, filled radiator up, and put another random cap on from the parts shelf.

Continued to steam over, and shortly after remembered not to fill down flow radiators all the way up like modern radiators... thanks Google! :D.

Figured it would just steam it's way to equilibrium, which it seemed to do, and eventually stopped. About 30 mins after that, it started showing signs of running hot - a bit down on power, started pinging, and noticed white smoke coming from exhaust.

Shut it down, pulled head next day, and yep - evidence of water in #3 cylinder. Flushed block, flushed radiator to make sure it wasn't plugged. It's not, water flows well top to bottom, and bottom to top.

New Fel-Pro head gasket went in, head torqued, new belt, thermostat removed, new hoses, everything assembled, radiator filled to just cover the tubes, but still under the level of the top inlet. Fired it up, and no water is flowing. After a couple minutes of running, I would see a bit of surge of water coming from the top inlet, then nothing for about 20-30 seconds, a quick surge, nothing, and repeat. I shut it down again to prevent another overheat.

Just pulled the water pump expecting to find heavy erosion, and it looks virtually new inside, but based on the faded paint on the outside, looks like the original pump. Impeller is also firmly fixed to the shaft, so I don't think it's slipping under load.

Is there some kind of special filling procedure for these things to prevent air lock? Something else I'm missing? There's no apparent reason I can see to prevent water flow....
 
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RogerinIowa
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PostPosted: Sun Jun 07, 2020 2:58 pm    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

Thermostat blocks flow until warm. But
is it in backwards or not working
properly?
 
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K5_489
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PostPosted: Sun Jun 07, 2020 3:01 pm    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote


How would a part that's not installed block the flow?
 
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Caryc
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PostPosted: Sun Jun 07, 2020 3:40 pm    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

K5_489 wrote:
(quoted from post at 16:01:54 06/07/20)
How would a part that's not installed block the flow?


I also saw that. Why would the OP not at least install a new thermostat?
 
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Blackhole49
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PostPosted: Sun Jun 07, 2020 3:54 pm    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

Look closer at your nut and axle. Both my 8n's have two slots in the axle for the wire. I have never had to back
off to get to line up with one of the slots.
 
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Roger in Iowa
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PostPosted: Sun Jun 07, 2020 4:33 pm    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

Did not see he had removed the thermostat!
 
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Caryc
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PostPosted: Sun Jun 07, 2020 5:30 pm    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

K5_489 wrote:
(quoted from post at 16:01:54 06/07/20)
How would a part that's not installed block the flow?


Why did you remove the thermostat? My 8N has been running for 60 years with a thermostat.
 
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Bob - MI
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PostPosted: Mon Jun 08, 2020 5:26 am    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

I guess I would pull both hoses and assure no blockages. Wondering if this was sitting a long time before you got it?
 
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ASEguy
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PostPosted: Tue Jun 09, 2020 3:55 am    Post subject: Re: 8N not pumping water after new head gasket? Reply to specific post Reply with quote

White smoke out of the exhaust again? If not, then I would put the thermostat back in pointed side towards the radiator and start it and run it until it gets to operating temp. (thermostat open). Then shut it down and feel the radiator core for uneven temps. Use a non contact thermometer if you have to. Look for significantly cooler spots (no/reduced flow). This works best as soon as the hot coolant moves into the radiator.
 
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