5TH-6TH Fork Rod Selection

WARNING: This page is about a different variant/trim than selected.

NOTE: In the following conditions, perform the procedures below.

Main shaft replacement
3rd to 6th drive gear and bushing replacement
3rd to 6th synchro ring assembly replacement
3rd-4th synchronizer hub and coupling sleeve assembly replacement
5th-6th synchronizer hub and coupling sleeve assembly replacement

Insert the main shaft assembly into the adapter plate.
Set the height gauge to the adapter plate. Lower the height gauge indicator to the upper face of the snap ring groove or the upper side of the main rear bearing. Set to zero point.
ST 18853AA000 HEIGHT GAUGE

Fig 1: Setting Height Gauge To Adapter Plate
Courtesy of SUBARU OF AMERICA, INC.
NOTE:
- The height gauge will be set on the adapter plate during the measurement. Use a scraper to remove any gasket material remaining on the end face.
- During measurement, do not place the height gauge in the shaded area shown in the figure.
Fig 2: Identifying Adapter Plate
Courtesy of SUBARU OF AMERICA, INC.
Use a height gauge to measure "D1" and "D2" as shown in the figure.

Fig 3: Measuring D1 And D2 Dimensions
Courtesy of SUBARU OF AMERICA, INC.
1. Shift up the 5th-6th coupling sleeve all the way to the 6th drive gear side, and measure "D2".
  
  Fig 4: Checking 6th Drive Gear
  Courtesy of SUBARU OF AMERICA, INC.
  NOTE:
  - Set the height gauge indicator near the measurement target, and lock dial (1) as shown in the figure. Turn dial (2), and set the indicator to the 6th side end surface of the coupling sleeve.
  - The measurement is to be performed with two persons, while holding the coupling sleeve straight.
  - Turn approximately 72° at a time, and measure the coupling sleeve in 5 locations. Round down the 2 highest and 2 lowest measurement values. The remaining center value is used as the measurement value.
  Fig 5: Turning Ball Bearing End Face
  Courtesy of SUBARU OF AMERICA, INC.
2. Set the height gauge indicator upside down.
  
  Fig 6: Setting Height Gauge Indicator Upside Down
  Courtesy of SUBARU OF AMERICA, INC.
3. Shift down the 5th-6th coupling sleeve all the way to the 5th drive gear side, and measure "D1".
  
  Fig 7: Checking 5th Drive Gear Side
  Courtesy of SUBARU OF AMERICA, INC.
  NOTE:
  - Set the height gauge indicator near the measurement target, and lock dial (1) as shown in the figure. Turn dial (2), and set the indicator to the 5th side end surface of the coupling sleeve.
  - Turn approximately 72° at a time, and measure the coupling sleeve in 5 locations. Round down the 2 highest and 2 lowest measurement values. The remaining center value is used as the measurement value.
  Fig 8: Turning Ball Bearing End Face
  Courtesy of SUBARU OF AMERICA, INC.

According to both of the measurements, calculate the neutral position of the 5th-6th coupling sleeve. From the following calculation, select a fork rod which matches the calculated value.

Calculation: T = (D1 + D2)/2

T: 5th-6th coupling sleeve center position

D1: Measured length from the shaft rear bearing snap ring groove to the coupling sleeve groove end, when shifted to 5th gear [Value: +55 mm (2.17 in)]

D2: Measured length from the main shaft rear bearing snap ring groove to the coupling sleeve groove end, when shifted to 6th gear

NOTE: Attach the indicator upside down in comparison to the setting procedures for the zero point. Add "d1" [Value: 55 mm (2.17 in)] from the figure below to "D1", and measure "D1".

Fig 9: Identifying Indicator Dimension

Courtesy of SUBARU OF AMERICA, INC.

T mm (in)	Lot No. (marking)
T mm (in)	M.SFT Snap ring 805072010 [t = 1.65 mm (0.065 in)]	M.SFT Snap ring 805072011 [t = 1.95 mm (0.077 in)]	M.SFT Snap ring 805072012 [t = 2.25 mm (0.089 in)]
64.12 - 64.42 (2.5244 - 2.5362)	32945AA110 (none)	32945AA120 (2)	32945AA130 (4)
64.42 - 64.72 (2.5362 - 2.5480)	32945AA100 (1)	32945AA110 (none)	32945AA120 (2)
64.72 - 65.02 (2.5480 - 2.5598)	32945AA090 (3)	32945AA100 (1)	32945AA110 (none)
T = Thickness