These are sleeve bearing motors oil ring lubricated along with lube mist.
Sleeve bearing requires that distribution groove not be allowed to go empty, which can be accomplished by oil ring. Typically (from what I've seen), there is no external cooling, just a reservoid below the bearing for the ring to dip into with enough volume and external surface area to keep the oil reasonably cool. Is that what you have? I haven't seen mist used with sleeve bearings - as far as I can gather it is somtimes used as sort of constant-fed purge gas in the bearing housing to prevent intrusion of moist or contaminated air.
Your ambient temperature is not particularly hot.
It would be worthwhile to review the viscosity of the lubricant you're using. (Higher than necessary can make bearing run too hot), but can't be so low as to lose oil film. Can you provide shaft journal diameter, bearing length, shaft speed (rpm) and type of oil (viscosity and preferably viscosity index), approximate weight of rotor, and what is connected to the motor (what type of load and are there gears or just coupling).
Are you able to see the oil ring with the machine running to verify it is spinning and delivering a good quantity of oil?
When bearings were inspected did they show signs of misalignment? (angle wear pattern within the bearing).
How about dry-roll/blue check of bearing to verify no unusual geometry?
Was bearing clearance checked? (too tight can make machine run hot).
Any unusual sludge in the reservoir?
Outside of bearing housing external - any unusual fouling?
Had the behavior of the beairngs changed since installation or they have always run this hot?
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(2B)+(2B)' ?
