Overview
The Crown Automotive 647693 is a 41.5 inch worm shaft for steering gears on Jeep CJ3, CJ5 and CJ6 models and Willys CJ-2, CJ-3, CJ-5 and CJ-6 models, covering 1946 to 1966.
A worm shaft is the input shaft of a steering gear, the part the steering wheel turns to drive the sector gear. The tube is not included, so a full worm shaft and tube assembly must be sourced separately.
Key features
- 41.5 inch worm shaft, as stated in the title
- Tube not included
- Crown Automotive part number 647693 with UPC 848399001822
- Fits CJ and Willys CJ models from 1946 to 1966
Worm shaft and steering gear service
The worm shaft is the input side of the steering gear. Turning the steering wheel rotates the worm, which drives the sector gear and moves the pitman arm. Worn worm bearings or a bent shaft can cause play at the wheel, and a tired shaft often shows up as a notchy or rough feel when turning off center.
Because the tube and shaft run inside the gear housing, replacing the worm shaft usually means opening the steering gear. Before removal, note how the tube and shaft line up and mark the housing so the reassembly matches. Clean the bearing surfaces, inspect the seals, and check the gear teeth for pitting before reassembly.
- Check steering play with the front wheels off the ground
- Look for oil around the steering box seal
- Replace worn bearings when the gear is open
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | 647693 |
| UPC | 848399001822 |
| Part type | Steering gear worm shaft |
| Length | 41.5 inch |
| Tube | Not included |
| Fitment type | Direct fit |
Vehicle fitment
It fits the 1959 Jeep CJ3 in Base trim, the 1959–1966 Jeep CJ5 and CJ6 in Base trim, 1946–1949 Willys CJ-2, 1949–1952 and 1954–1958 Willys CJ-3, 1955–1958 Willys CJ-5, and 1956–1958 Willys CJ-6.
CJ7 and Wrangler models are not in this list. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Worm shaft replacement generally means the steering gear is opened. Plan on a steering specialist for this work, since the gear usually has to be disassembled.
What’s included
The worm shaft is listed on its own.
Not included: the tube, which is a separate item.
