M/T - Modified Countershaft Rear Bearing & Journal
83mercedes02TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: March, 1983 REF. NO. 26/12
SUBJECT: MODIFIED COUNTERSHAFT REAR BEARING AND BEARING JOURNAL TRANSMISSION 716.21 (GL 68/20) CHASSIS 123.123
Since December 1981 production, a roller cage with 12 rollers (previously 9) is used for the countershaft rear bearing. In addition, the bearing journal diameter has been increased form 23 mm to 27 mm.
The repair kit includes a roller cage (12 rollers) with outer race assembly and a separate inner race. When repairing old version countershafts (23 mm diameter bearing journal), install bearing with inner race. On new version countershafts install bearing without inner race.
The previous roller cage (9 rollers) is no longer available as a spare part.
Installation of Modified Bearing
1. Remove manual transmission (microfiche no. 07 102 2128 01, job no. 26-020).
2. Remove gear set (microfiche no. 07 102 2128 01, job no. 26-400, section A)..
3. Check the bearing journal for damage, such as scores, pit marks, or nicks. If the bearing journal is not damaged, it is not necessary to replace the countershaft.
FIGURE 1 SCORED OR PITTED BEARING JOURNAL:
If the bearing journal shows damage or wear (arrow, Figure 1), the countershaft must be replaced.
FIGURE 2 - MODIFIED INSTALLATION SLEEVE:
NOTE: Steps 4 and 5 only apply to countershafts with the 23 mm diameter bearing journal.
4. Existing installation sleeves (Tool No. 123 589 02 14 00) have been modified by the addition of a 23 mm dia. counterbore as shown in Figure 2.
FIGURE 3 - INSTALLING INNER RACE:
5. Using the modified installation sleeve, press the inner race on to the 23 mm diameter journal of the old style countershaft (Figure 3).
FIGURE 4 - INSTALLING ROLLER CAGE:
6. Press the new roller bearing into the transmission housing rear wall using a suitable installation drift (Figure 4).
FIGURE 5 - LETTERING ON ROLLER CAGE:
IMPORTANT: The lettering on the roller bearing (arrow) must face outward (Figure 5).
7. Install gear set (job no. 26-400, section A).
8. Install manual transmission (job no. 26-020).
Parts Information
Part Name Part Number
Repair kit, roller bearing 002 981 16 12
(roller bearing with separate inner race)
Time Allowance
26-010-01 Manual Transmission, R & R 2.6 hours
26-250-01 Transmission Main Components for Overhaul R & R 2.8 hours
(Transmission removed)
26-S12-01 Pressing Inner Race on Countershaft 0.2 hour
Tool Information
Tool Name Tool Number Group Price*
Installation Sleeve 123 589 02 14 00 26/C $21.07
*) Subject to change