[Mgs] Running hot

[Max Heim]

How old is the water pump? Maybe the blades have corroded away. 

Does the car have a mechanical fan as well?

Is the radiator temp even across the face, or does it have cold spots?

Sent from my iPad

> On Jan 29, 2021, at 6:14 PM, rolindsay at yahoo.com wrote:
> 
> 
> Hello friends. I haven't written to bother you for a long time, but now I do so because I need advice. My recently resurrected '72 MGB's engine runs hot. It doesn't boil over but it 'overheats'. Here are the details from two tests.
> 
> 1972 MGB, idling from cold start, bonnet open, 50:50 antifreeze mix, heater valve open, new water pump, flushed radiator, 10# radiator cap, timing set correctly, air:fuel ratio set correctly, carbs balanced.
>  
> First day tests, w/o electric fan on:
> 
> Time
> Since     Coolant            Gauge
> Start      Temperature   Reading
> -----------+‐--------------------+--‐----------
> 0 min         71°F             minimum
> 1 min         72°F             minimum
> 5 min         160°F           1/4 scale
> 10 min       195°F           5/8 scale
> 15 min       220°F           7/8 scale
> 
> 
> Second day tests, with electric fan on:
> 
> Time
> Since     Coolant             Gauge
> Start      Temperature    Reading
> -----------+‐--------------------+--‐----------
> 0 min         63°F             minimum
> 1 min         64°F             minimum
> 5 min         159°F           1/4 scale
> 10 min       195°F           5/8 scale
> 15 min       228°F           edge of 'H'
> 
> Conclusions:
> 1. Engine starts easily, idles smoothly, and runs great.
> 2. No boil over in either test case.
> 3. Electric fan 'on' cannot overcome whatever is causing the car to run hot.
> 4. Temperatures measured at top of thermostat housing, but verified to be the same at the radiator top neck.
> 5. Charge is neither lean nor rich.
> 6. Timing is set correctly.
> 
> What product might I use to flush debris from the block and head, if that is indeed the problem? Thoughts? And thanks.
> 
> -Rick, in Houston, TX
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