4" Triple-Groove Underdrive Crank Pulley
Maximize your engine's potential with our 4" Triple-Groove Underdrive Pulley. Designed for high-RPM performance, this pulley reduces the rotational load on your engine by slowing down belt-driven accessories. This underdrive design, combined with a significant reduction in weight, translates directly into increased horsepower and improved cooling efficiency.
Lightweight Performance & Precision
Standard steel harmonic balancers are bulky, weighing roughly 5 lbs with a diameter over 6". Our performance version is CNC-machined from American 6061-T6 billet aluminum, slashing the weight to just 1.5 lbs and the diameter to 4".
- Reduced Drag: The smaller, lighter design allows the engine to rev more freely.
- Optimized Cooling: By reducing water pump RPM, this pulley prevents cavitation at high speeds, keeping your cooling system efficient.
- Precision Timing: Features a built-in laser-etched degree wheel on the front face, allowing you to identify Top Dead Center (TDC) with absolute accuracy.
- Maximum Durability: Each pulley is hard-anodized for superior wear resistance and long-lasting laser markings.
Accessory Configuration: Triple-Groove
This Triple-Groove model is the "full accessory" version, designed to accommodate:
- Alternator
- Air Conditioning (A/C)
- Power Steering
(For Single or Double-groove configurations, please see our other listings.)
Recommended Components
To ensure a complete and professional installation, we recommend the following:
- Crankshaft Oil Seal: [Part number: 1015042]
- Adjustable Timing Tag: [Part number: 1016117] (Highly recommended for use with the integrated degree wheel)
- Complete Underdrive Kits: For a total system overhaul, see Part numbers 1016120, 1016123, or 1016124.
NOTES: Not recommended for street driven vehicles or rock crawlers.
| Note: Images are for illustration purposes only. Images may not represent the product listed. Please contact customer service with any questions or concerns: 1-928-505-2501. |
- 1975-1980 20R 2.2L Engines
- 1981-1995 22R 2.4L Engines
- 1983-1995 22RE 2.4L Engines
- 1985-1988 22RET 2.4L Engines
To open a printable PDF version of this instruction CLICK HERE
LC Engineering strongly recommends that you review a factory service manual, our call our tech line 928-855-6341 if you have questions during installation.
LC Engineering's 4 inch underdrive crankshaft pulley will install just like the stock Pulley. What will need to be done is the timing tag on the oil pump will need to be trimmed off for added belt clearance. That's why it is recommend to run the LCE adjustable timing tag, Part# 1016117. The front crankshaft oil pump seal rides on the pulley. So it is also recommended to install a new crankshaft oil pump seal when installing the new pulley. Apply motor oil on the seal and seal surface when reinstalling the new pulley. Be sure the crankshaft key is in place and in good condition when reinstalling. Torque front bolt to 80 Ft Lbs.
