[Mgs] Running hot

[Charles Robinson]

Are you sure the thermostat it working correctly?  You didn't mention it.

CR

On 1/29/2021 8:12 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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