Pulleys, Fan Clutches, Thermostats, Fan Belts

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Eccentric and Alternator Pulleys
These are "underdrive" pulleys - meaning the water pump and alternator will turn slower. This reduces horsepower loss from the drag of those units, and reduces the chance of water pump cavitation at higher rpm's.
Pulley Part Number Image
Single Belt Eccentric Pulley 11473
Dual Belt Alternator Pulley 3" OD 11479 Dual Belt Alternator Pulley
74-92 Underdrive Eccentric Pulley 4" OD
Timing marks at -10 (ATDC) 0, 10 (BTDC) and 20 (BTDC)		 11469 Underdrive Eccentric Pulley
Single Belt Eccentric Pulley 3.5" OD
6 Bolt 5mm x.8 (same as 10-32)
This does not fit any other pulleys we know of.		 01-7201-0000
Single Belt Alternator Pulley
Larger diameter than stock pulley.
Slows down alternator for racing purposes.		 78-153A-0833 Single Alternator Pulley
Water Pump Pulley 5" OD
Slows down water pump for racing applications
Fits 79-85 water pumps		 01-7211-0000 Water Pump Pulley
Water Pump Pulley 5" OD
Slows down water pump for racing applications
Fits 86-88 water pumps		 01-7212-0000 Water Pump Pulley
Water Pump Pulley 5" OD
Slows down water pump for racing applications
Fits 89-92 water pumps		 01-7213-0000 Water Pump Pulley
Note: If you have removed the air pump, the remaining belt does not wrap very far around the water pump pulley. This lack of belt contact area area can lead to slippage of the water pump at high rpm's/high load conditions. The "high load" can be caused by the fan itself, or by the fan clutch being too stiff and/or frozen.

We strongly recommend using at least the dual belt alternator pulley to double the water pump pulley belt contact area.
Please read FAQ at:Front Pulley / Thrust Bearings to help prevent problems when changing front pully.

 

Other Pulleys
93-95 Stock Power Steering Pulley 32-620B-FD01 Power Steering Pulley
93-95 Stock Power Steering Pulley Nut 01-2110-9994

 

Fan Clutch
These go bad in two ways - either seized-up, which is very hard on the water pump and belts (and very noisy), or they are free-wheeling, which gives overheating while stopped or slow driving. With the engine off, there should be no side-to-side play, and reasonable resistance should be felt when you spin the fan blades. We have seen a few that were very inconsistent - they would feel fine for four or five spins, then go completely free-wheeling, and/or seize up. The later (84+) fan clutches have thermostats in them that vary the resistance of the clutch according to the temperature of the air moving across them.
Application Part Number Fan Clutch
79-80 12A 15-2100-1202
81-83 12A 15-210B-N201
84-85 12A 15-210B-N249
84-85 13B GSLSE 15-210B-N304
86-88 13B All 15-1500-N326
89-92 13B All 15-1500-N350

 

Fan Motor
93-95 Fan Motor 15-1500-N3A1

 

Thermostat

All rotary's must have a thermostat for street application. The rotary thermostat must be for a By-Pass System (has spring-loaded disc on bottom). The use of the wrong thermostat will cause 20% to 30% loss in cooling capacity.
All Rotary thru 85 15-1710-8553 Thermostat all -85
86-88 15-1710-8AF1-9U 86-88 Thermostat
89-95
Note: We have had several problems lately with the
OEM 89-95 thermostats due to their rubber seal failing.
For this reason, we sell the Stant thermostat for this application.		 15-1710-8AF6 89-95 Thermostat
Thermostat Gaskets
All Rotary thru 88 15-173A-1757 Thermostat Gaksket all -88
89-95 (o-ring type) 15-1730-N3C1 Thermostat O-Ring 89-95

 

79-85 Belts
Image Description Part Number
Belt Alternator/W.P. 18-381A-8311
74-85 Air Pump
12A Only 		13-7150-1757
84-85 13B Air Pump
13B Only		 13-7150-N304
79-81 A/C 67-C31A-0000-6A
82-85 A/C (Lonestar System) 67-5409-0000-03
84-85 A/C (Nippondenso Sys.) 68-1111-0000-05
84-85 Power Steering 15-907A-N249

 

86-92 Belts
Image Description Part Number
Belt 86-88 Alternator/W.P. 18-381A-8311
89-92 Alternator/W.P. 18-3810-N350
86-88 N/T Air Pump 13-7150-N304
86-88 Turbo Air Pump 13-813A-N370
89-92 Air Pump 13-813A-N370
86-88 A/C 67-C31A-0000-6A
89-92 A/C 15-9080-N326
86-92 P/S (96.5cm Long) 15-9080-N326
86-92 P/S (105.5cm Long) 15-9090-N326-9U

 

93-95 Belts
Image Description Part Number
Belt Alternator/Air Pump
93-94 manual trans		 18-3810-N3Z1
Alternator/Air Pump
93-94 auto trans

ALL 95

 18-3810-N3Z2
Power Steering (w/o A/C) 15-9070-N3A1
Power Steering (with A/C) 15-9080-N3A1

 

Main Engine Parts Page

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