[davidh]

Excerpt from TCM IO-360 Seris Operators Manual:

The operator can take certain steps to cope with problems associated with hot weather/ hot engine starting. The primary objective should be that of permitting the system to cool. Low power settings during the landing approach will allow some cooling prior to the next start attempt. Ground operation tends to heat up the engine, therefore, minimizing this will be beneficial. Cowl flaps should be opened fully while taxiing. The aircraft should be parked so as to face into the wind to take advantage of the cooling effect. Restarting attempts will be the most difficult during the 30 minutes to one hour after shutdown. Following that interval, the fuel vapor will be less pronounced and normally will present less of a restart problem. The starting procedure for a hot engine is the same as the normal starting procedure except that the throttle should be opened more while cranking.

If the above procedure does not effect a start, proceed as follows:

a. Ignition switch off.
b. Throttle open
c. Mixture Idle Cut-Off
d. Fuel pump on high 15 seconds
e. Normal start procedure

This usually works on my 336. If it's a particurly hot day, I'll leave the boost pumps on "low' during cranking.