I had a chance to compare some the internals of some different fan clutches whilst tracking down the overheating in the cruiser.
Whilst I can’t actually dyno the behaviours, the pics below tell a story.
The operation of the OEM clutch is explained here - http://neuralfibre.com/paul/4wd/tuning-and-understanding-your-toyota-viscous-fan-clutch
As the pics below show, the OEM clutch has far more coupling rings, more surface area, a better adjustable valve system, and more fluid. The aftermarket is a Daikin unit. Read more... (129 words, 6 images, estimated 31 secs reading time)
Landcruiser or Hilux overheating? Your factory fan clutch is probably under-filled and incorrectly set from factory. Fix this first and you may save a lot of time chasing issues.
The stock Toyota cooling system can sometimes be somewhat marginal. The suspicion for this falls on every component and modification in the system. Read more... (1323 words, 17 images, estimated 5:18 mins reading time)
- Radiator (Size / Efficiency)
- Thermostat (Brand / Effectiveness)
- Water Pump (Flow, Cavitation)
- Radiator Cap (Quality, Pressure, Leaks, Recovery)
