Tech:Engine/A Series/Cooling Guide
Comparison
Water Pump:
A front wheel drive (FWD) 4A-GE water pump off either an AE82 or AE92/3 is fundamentally different from a rear wheel drive (RWD) 4A-GE pump from a JDM AE86. To begin with, the RWD pump is taller than the FWD pump (i.e. Sticks out further from the engine block). The RWD pump also has better bearings in order to support the weight of a pump mounted radiator fan. Note: If you attach a fan to the front of a FWD pump it will soon fail and no longer function. Interestingly, a RWD 4A-C water pump is almost identical to that of a RWD 4A-GE pump. The only difference is the position of the little ridge on which the cam cover sits.
Water Pump Rear Housing:
Once again the FWD variety of the 4A-GE rear housing is very different to the RWD version. It consists of only a single large water inlet (from thermostat) and an outlet which bolts directly onto the front of the 4A-GE block. The RWD version on the other hand has in integrated thermostat just after the water inlet as well as a bypass inlet from the front water outlet on the head. There is also another inlet which comes from the heater core and had the same outlet bolted onto the block. The RWD 4A-C rear housing is identical to that of a RWD 4A-GE one.
Water Pulley:
A FWD 4A-GE has a pulley with a smaller offset than the RWD 4A-GE one in order to compensate for the shortness of the FWD water pump. The RWD 4A-GE one is considerably more offset. The RWD 4A-C version has the same offset as the RWD 4A-GE one but it uses a single V belt rather than a 5-rib belt.
See also
- http://www.rollaclub.com/board/index.php?showtopic=19896 (Discussion On 16V 4AGE Cooling On Forum).
Article by Golberg
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