[Fot] Coolant conundrum

[Anthony Parker]

Thanks Jason,

Just got the engine together last night.
Have not run leak down.
Brand new Payen head gasket on freshly decked block.

Stock pump with only three weekends on it which had been performing properly.
Al pulley seems to be turning with the shaft. I have looked and felt.  The engine has only been idling.


________________________________
From: JS Performance Motoring, LLC <jason at jsperformancemotoring.com>
Sent: Saturday, September 23, 2023 2:18 PM
To: Anthony Parker <solarant at hotmail.com>
Subject: Re: [Fot] Coolant conundrum

Anthony,
           Have you watched for bubbles thru the radiator fill cap with the engine running? Run a leak down test?  If you had a majorly failed head gasket, not sure it would hold pressure overnight like that.


Is it a stock type water pump?  Not a common failure, but what if the impeller has cracked or failed, and as things warm up it expands and loses its press fit "grip"  to the shaft.   OR if you are running some sort of aluminum pulley, that could be behaving similarly.


Good luck,


Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason at jsperformancemotoring.com<mailto:jason at jsperformancemotoring.com>
https://www.facebook.com/JSPerformanceMotoring/


On Sat, Sep 23, 2023 at 2:04 PM Anthony Parker via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:
I'm having cooling problems.
Need help being convinced that I have to do what I don't want to do.

Brand new short block, same old head, water pump, and radiator.

Over three trials, the engine will run fine and warm up with radiator hoses and radiator warming properly. Then the hoses and radiator will cool and coolant temp will spike to 230+. Radiator cold with sky high coolant temps.

Two more clues, hoses seem to pressurize very quickly and when I opened the radiator cap this morning (after cooling all night) pressurized air and coolant shot everywhere.

No thermostat and I have confirmed three times that system is completely full

Seems I have combustion gases getting into coolant and then bubbles eventually removing pump prime.

Don't know what else it could be.

Given the apparent direction of the leak, is there any use in trying some "stop leak" product?

Is it time to pull the head again to look for warping or gasket leak?

I suppose it could be a cracked cylinder, but this block has been checked by two different trusted engine machinists.

Desperately trying to get to the RunOffs, Anthony.
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