Table of contents: Carburetor models 4.2 l and 3.0 l ↓ 4.2L EFI Models ↓
Carburetor models 4.2 l and 3.0 l
All models are equipped with a TX12A transfer case, installed in the rear part of the transmission and allowing the driver to directly drive the front wheels of the car in upshift or downshift modes. The selection is made using a lever located on the wall of the transmission and connected to the transfer case control lever via a shift rod. To enable the operation of the power take-off unit (PTO) (if such is provided) the selector lever can be moved to the "N" position.
The transfer case assembly consists of front, central and rear housings and contains input, driven and front output shafts rotating in roller bearings. To avoid loss of lubricating fluid, the housings are equipped with seals.
Transfer case components
1 - drive chain; 2 - bearing; 3 - driven shaft; 4 - shift rods; 5 - shift forks; 6 - holder; 7 - input shaft; 8 - intermediate shaft; 9 - front output shaft
(The text is published on the website: «www.NISSANBOOK.ru»)
Rotation is transmitted from the rear of the driven shaft of the gearbox to the splines of the input shaft. The overdrive mode is engaged by moving the sliding splined clutch forward, which leads to direct engagement of the input shaft with the driven shaft. Moving the clutch backward removes the shafts from direct engagement and articulates them through the reduction gear. In this case, rotation is transmitted from the input shaft to the reduction gear by means of an intermediate shaft. The intermediate shaft is equipped with spring-loaded toothed rings at both ends to select the backlash.
The drive to the front wheels is achieved by engaging the drive sprocket and the clutch gear of the driven shaft through the internal splines of the synchronizer clutch, which articulate the synchronizer teeth with the clutch gear. Synchronization is achieved by contact between the synchronizer ring and the cone on the wall of the clutch gear. In this case, the rotation speeds of the drive sprocket and gear are equalized and smooth shifting is achieved. The drive chain is used to transmit rotation from the drive sprocket to the front output shaft.
4.2L EFI Models
The transfer case differs from the TX12A considered above by the absence of a spring-loaded toothed ring, a disc spring and a spacer ring on the rear end of the intermediate shaft. On models produced since December 1992, there is also no locking ring and spacer ring on the front end of the intermediate shaft (see accompanying illustration) - components fixed since 10.91 are marked with *, fixed since 12.91 - #.
1 - toothed ring; 1* - toothed ring; 2 - distance ring; 2# - distance ring; 2* - distance ring; 3# - retaining ring; 4 - bearing; 5 - disc spring; 5*— disc spring; 6 - intermediate shaft; 7 - adjusting washer
Since August 1995, the spacer on the front end of the input shaft and the spacer ring next to the center bearing of the driven shaft have been eliminated.
Transfer case maintenance procedures are the same for all models.