Hello,
I have compiles a list of possible overheating causes on the Healey 100
provided by you in the pat days.
Please let me know if you have any comments - maybe we can ask John Sims to
put it up on the website?
---------------------------------
Overheating problems on a Austin-Healey 100
NOTE: The 4 cylinder engine cooling system in it's stock form is absolutely
sufficient to cool the engine. If the engine is overheating something has to
be wrong.
1. Check the temperature gauge - is it functioning properly and reading
correct temperature?
2. Check the thermostat - is it operating properly, opening at the
designated temperature?
3. Try using a 180 or 160 deg thermostat, these cars originally did not use
190+ thermostats.
4. Is the coolant level proper?
5. Is the coolant a proper mix of antifreeze concentrate & water? Too much
antifreeze reduces the cooling efficiency of the coolant.
6. Is the Radiator cap a 4-7PSI cap?
7. Is the engine block/head clean? If not, redistrip/ chemistrip the block.
8. Is the radiator clean? Even if new, it could be blocked by debris from a
dirty block. A full stock radiator should empty in about 12 seconds.
9. If you changed to aluminum radiator, check it's capacity - is it not less
than the stock one?
10. If you have placed a fan in front of the radiator it may be blocking air
- try removing it
11. Are all air deflectors fitted?
12. Are the heat shields in place?
13. Check the exhaust manifold for cracks
14. Check if the manifold is not loose
15. It's a good idea to have your manifold ceramic coated - it prevents high
temperature radiating from the manifold
16. Is the fan belt properly tight?
17. Is the water pump not defective?
18. Is the head gasket not cracked?
19. Is the head not cracked (the 100 heads are prone to cracking between
cylinder 2 & 3) You can check it by checking the compression on cylinders.
20. Has the head not been over shaved? If so, the water channels coming from
the block will not match the channels in the head - they run at an angle.
21. The distributor should be set to ~6-10 deg @600 RPM; 35-38 deg max @
~3000 rpm; Gap 0.015"
22. Are the carbs tuned properly?
23. The carbs are not set too lean?
24. Brake system checked? No brakes binding?
25. Is the oil pressure correct?
[demime 1.01d removed an attachment of type application/msword which had a name
of Overheating.doc]
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