A few more for your list:
- is the oil level up to the mark?
- is the timing correct?
- is the fuel mixture too lean?
- is the coolant mixure correct (50/50)?
Tab Julius had this to say:
>
>I've been in the middle of this myself. My '78B (your message quoted here
>doesn't say which year you have) is often running hot. Never below 70%,
>often up to the edge of the red.
>
>Various solutions are (not in any particular order):
>
>- New thermostat
>- Flush radiator
>- Flush the thermostat housing
>- Flush the heater
>- Replace or recore the radiator
>- Sufficient coolant
>- Make sure the thermoswitch on the radiator works (more important when
>idling than when driving)
>- Make sure the temperature sender is okay (a bad guage will lead you astray)
>
>Not sure if I forgot any...
>
>Personally, I'm about to recore the radiator. I've done about everything
>else.
>
>- Tab
>
>At 08:24 AM 7/28/00 -0500, Mark Purtell wrote:
>>Thanks for the help already, but I'm still a bit puzzled by the MGB's
>>cooling system. I flushed the system, and refilled the block and radiator
>>with coolant. Then I drove the car (to open up the thermostat) and added
>>more coolant (I did this twice). Now when I drive the car, the
>>temperature needle moves up to the middle of the gauge temperature at a
>>"normal" rate, and then once it reaches about halfway, it stays there for
>>a minute or two and then it shoots up to the overheat area-it doesn't
>>always reach "overheat", but it gets close and will occasionaly peg the
>>end of the gauge. Once the needle says "overheat", as I drive faster, the
>>temperature gauge moves down from overheat, but never remains in the
>>middle of the gauge. The engine doesn't seem really hot, and my Hayden
>>fan is running fine. I have already replaced the temp sensor and have 180
>>degree thermostat in it.
>>
>>Thanks in advance-
>>Mark
>>
>>
>>
>>
>
>
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
|