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Old 04-15-2018, 10:43 AM
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engine over heating

I have in stalled a ZZ4 vortex 350 marine engine into a el Camino. Engine has less than 100 hours on it. My friend under warranty replaced the engine in a new boat due over heating, of which he could duplicate the issue. I have dissembles engine checking for overheating issue and could not find any signs of heating issue. i have replace thermostat, clutch fam, 7 blade fan blade. new gauges, 3 row aluminum radiator. Also i have a March performance serpentine system on the engine still running hot. I have just eliminated the clutch fan and running straight, lots of air flow but going up slower. Could be i need a reverse flow water pump

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Old 04-15-2018, 10:54 AM
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If the March system uses the backside of the serpentine belt, the flat side, to turn the water pump you need a reverse rotation pump, and a reverse rotation fan.

If it uses the ribbed side of the belt, it uses a conventional rotation pump.

Some other things for you to check:
Retarded ignition timing will raise engine temp.
Lean fuel mixture can lead to overheating.
Make sure the anti-collapse coil spring is present in the lower radiator hose.

Have you got a fan shroud on the radiator??

Overheating at idle and low speeds is most often an airflow issue, overheating at highway speeds is most often a water flow issue or inadequate radiator capacity, but it looks like you've got that size issue dealt with already.
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Old 04-15-2018, 11:17 AM
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Here's how to tell for sure which rotation water pump you have. See picture.
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Old 04-15-2018, 11:33 AM
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Quote:
Originally Posted by [email protected] View Post
I have in stalled a ZZ4 vortex 350 marine engine into a el Camino. Engine has less than 100 hours on it. My friend under warranty replaced the engine in a new boat due over heating, of which he could duplicate the issue. I have dissembles engine checking for overheating issue and could not find any signs of heating issue. i have replace thermostat, clutch fam, 7 blade fan blade. new gauges, 3 row aluminum radiator. Also i have a March performance serpentine system on the engine still running hot. I have just eliminated the clutch fan and running straight, lots of air flow but going up slower. Could be i need a reverse flow water pump
If the belt runs under the pulley it needs a counter clockwise turning (reverse direction) pump and fan, similar too if not the factory pieces from 87 to 2000 production LO3, LO5, L30, and L31 engines.

Bogie
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Old 05-15-2019, 05:25 PM
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over heating

Started witha a 3 core brass /copper radiator with a thermostate 160-180.......blew the thermostate 2 times so now I run a restrictive plate 3/4 in hole...... running a shroud and a aluminum ridiged fan temp runs 180 freway, and stop and go Off road 220 in sand I face the wind and run 2 full trottle run's and watch the temp drop to 180 then I park the truck..... this has been running since 1983...... so today 2019 its running a 3 core aluminum radiator from Wizard distilled and 50/50 oil 20 50 castrol and slick 50 took out this toy on the beach and to get out had to red line the run up a sandy hill 1st gear and broke my fan belt... temp up to 365....... for 5 min..... stopped by the restroom and changed the belt carry spare parts.... this was in 2015 and its 2019 and 231 runs like a monster yet..... same motor .. ruins 150-170 now on the street........
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