Underdrive Crank Pulley
Our famous underdrive pulley for the 22R has evolved to the 2RZ/3RZ. This version of our crank pulley increases performance because it underdrives all the accessories (15-20%), unlike the accessory-only kits out there that do not include the crank pulley. We do not push the amount, or percentage, too far for two main reasons. First, it is important to keep charging systems, air conditioning, power steering, and water pumps moving fast enough for everyday driving. Second, not much horsepower is gained from extreme underdriving.
For the 3RZ, all of the underdriving is done at the crank pulley, not the accessory pulleys. This is done so that maximum weight loss can be achieved at the crank where most of the horsepower gains are realized. The 3RZ series underdrive crank pulleys are available in a black anodized finish with the engraved LC Engineering Performance Toyota logo. The Stock pulley weighs in at 6 pounds the LC Engineering billet Aluminum comes in at 2.5 pounds. This is quite a reduction in rotating mass. Less rotating mass will free up horsepower and give quicker throttle response.
NOTE: You may have to change belt sizes to use this pulley. May see higher engine temp in stop and go / low-speed applications. This Underdrive pulley is not intended to be used with our supercharger.
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- 1995.5-2004 2RZ 2.4L Engines
- 1995.5-2004 3RZ 2.7L Engines
To open a printable PDF version of this instruction CLICK HERE
LC Engineering strongly recommends that a qualified technician or individual with strong mechanical skills perform this installation.
Installation:
- Remove lower skid plate if your vehicle has one.
- Remove fan shroud. This may require removal of upper radiator hose in some models, if so drain just enough coolant from radiator to remove hose without leaking coolant.
- Loosen the nuts holding the fan to the water pump while the belts are still tight (this will help to keep the fan from turning). Do not remove nuts completely yet.
- Remove all belts. Be sure to remember which belt goes where.
- Remove crank pulley bolt and remove crank pulley. You may have to remove the radiator in order to get a puller on the pulley if it is tight coming off.
- Clean around the crankshaft snout and surrounding areas. We recommend replacing the front seal at this point.
- Install new pulley by inserting it onto the crankshaft snout and rotating the pulley until it seats in fully. Be sure to seat the pulley in completely, it will usually seat in part way while rotating then as you keep rotating it the pulley will seat in the rest of the way.
- Torque front crank pulley bolt to factory spec (193 ft lbs). You may have to put vehicle in gear and set emergency brake to keep the engine from rotating while doing this. You could also have an assistant hold a long screwdriver or pry bar in the u-joint to hold it from rotating.
- Install belts back on to new pulley & do not tighten belts yet. NOTE: On some models it may be necessary to change belt sizes. Due to the various belt configurations, LCE does not know what belts all applications will need to use. In test fitting this pulley on a 1995 3rz Tacoma 4x4, LCE found that 2 of the stock belts could be retained and one needed to be shorter. However we used shorter belts on all three to obtain more adjustability.
- Install fan and tighten belts.
- Install fan shroud.
- Install upper radiator hose and top off with coolant as needed.
- Install lower skid plate.
- Be sure to inspect all belts for proper alignment prior to initial start-up.
- Start vehicle and check for any coolant leaks.
5 Reviews Hide Reviews Show Reviews
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Emmanuel Santiago-Rolon give 5 stars
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Underdrive crank pulley
I had to redo my oil pump cover because it was still leaking. Needless to say this pulley was a lot less expensive than an oem harmonic balancer which cracked during removal. Decently noticeable difference in driving as well. Quicker throttle response and less downshifting on the hills.
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James Allen Hartley give 5 stars
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Very nice!
My 02 Taco 2.7L loves it.....I love it! You can feel a difference with this performance underdrive crank shaft pulley. Better throttle response. Better acceleration. Not a bad result for a little performance bolt on. ;-]
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