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 3.25" OD	11473
Dual Belt Alternator Pulley 3" OD Fits all Mazda RX Alternators -92	11479
Dual Belt Alternator Pulley 2 5/16" OD Fits 93-95 Alternator when swapped into an earlier car.	11480-VBK Black
	11480-VP Purple
	11480-VB Blue
74-92 Underdrive Eccentric Pulley 4" OD Timing marks at -10 (ATDC) 0, 10 (BTDC) and 20 (BTDC)	11469
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
Water Pump Pulley 5" OD Slows down water pump for racing applications Fits 79-85 water pumps	01-7211-0000
Water Pump Pulley 5" OD Slows down water pump for racing applications Fits 86-88 water pumps	01-7212-0000
Water Pump Pulley 5" OD Slows down water pump for racing applications Fits 89-92 water pumps	01-7213-0000
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
93-95 Stock Power Steering Pulley Nut	01-2110-9994
87-ON Idler Pulley Small Diameter 12MM, Staked Bearing	15-9400-R230
Idler Pulley Large Diameter, Snap Ring Bearing	67-C42A-0000-6A	No Longer Available
93-95 Idler Pulley	15-94Y0-N3A1

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
79-80 12A	15-2100-1202
81-83 12A	15-210B-N201
84-85 12A	15-210B-N249
84-85 13B GSLSE	No Longer Available
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 rotarys 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
86-88	15-1710-8AF1-9U
89-95 Includes gasket	15-1710-8AF6-9U
Thermostat Gaskets
All Rotary thru 88	15-173A-1757
89-95 (o-ring type)	15-1730-N3C1

Belts
We use the Genuine OEM Mazda belts wherever possible. When Mazda has discontinued a belt, or they have changed to an unfavorable manufacturer, we supply Bando belts. Bando is the original manufacturer for Mazda and they are by far the most consistent quality belt we have ever used.

79-85 Belts
Image	Description	Part Number
	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
	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
	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

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