TRUCK & TRAILER CAMSHAFTS IDENFITICATION
Camshaft Idenfitication
Step 1: Identify the Spider Journal Diameter : (1-1/4, 1-1/2, 1-5/8, 1-3/4 )
Directions: Measure the diameter of the spider journal (the bearing surface directly under the cam head).
Step 2: Identify the Support Bushing Journal Diameter: (1-1/4, 1-1/2, 1-5/8, 1-3/4)
Step 3:Identify the Length to Far End of the Lock Ring Groove(s) on Spider Journal below:
Measure the distance from under the cam head to the outside of the spider journal lock ring groove(s). Most OEM cams are single grooved for their particular application while most aftermarket cams are double grooved.
If the cam you have is double grooved:
a: Measure the distance to the outside of the required lock ring groove (you can tell by the spider journal wear pattern).
b: Note where the other groove is (before or after the one being used) and measure the distance from under the cam head to the outside of the other groove.
| NO Lock Ring Groove |
|---|
| 1 11/32" (Dim. 3A) / 2 7/32" (Dim. 3B) Double Lock Ring Grooves |
| 1 5/8" (Dim. 3A) / 2 7/32" (Dim. 3B) Double Lock Ring Grooves |
| 1 3/4" Single Lock Ring Groove (Dim. 3A) |
| 1 3/4" (Dim. 3A) / 2 1/16" (Dim. 3B) Double Lock Ring Grooves |
| 2 1/8" Single Lock Ring Groove (Dim. 3A) |
| 2 5/32" Single Lock Ring Groove (Dim. 3A) |
| 2 7/32" Single Lock Ring Groove (Dim. 3A) |
| 2 7/32" (Dim. 3A) / 2 21/32" (Dim. 3B) Double Lock Ring Grooves |
| 2 11/32" Single Lock Ring Groove (Dim. 3A) |
| 2 21/32" Single Lock Ring Groove (Dim. 3A) |
| 2 1/4" Single Lock Ring Groove (Dim. 3A) |
| 3 7/8" Single Lock Ring Groove (Dim. 3A) |
Step 4: Identify the Number of Splines : (10, 24, 28, 37)
Count the number of splines: For 1-1/4" diameter splines there are 10 or 24.
For 1-1/2" diameter splines there are 10 or 28.
Step 5: Identify the Diameter of the Spline End for Lock Ring:
Measure the diameter where the lock ring groove is at the end of the camshaft.(1-1/16, 1-1/4, 1-1/8, 1-1/2, 1-3/8)
Step 6: FINAL Step : Identify the Axle Application from the list below:
| 12-1/4 Trailer Axle |
|---|
| 14-1/2 Front Axle |
| 14-1/2 Drive Axle |
| 15" Front Axle |
| 15" Drive Axle |
| 16-1/4 Front Axle |
| 16-1/2 Drive Axle |
| 16-1/2 Front Axle |
| 16-1/2 Trailer Axle |
| 18" Drive Axle |
| 18" Trailer |
| 20" Trailer Axle |
