M/T - Reverse Gear Difficult to Engage

Classification:
MT93-001



Section:
Man.Trans.



Reference:
TECHNICAL BULLETIN NTB93-003



Models:
Sentra(B13); NX(KB13)



Date:
January 14, 1993



M/T REVERSE GEAR DIFFICULT TO ENGAGE


APPLIED MODELS:
Sentra(B13); NX(KB13) 1600/2000



APPLIED V.I.N/BUILD DATE:
Japan-Built

JN1GB34C***100092/Sept. 16, 1991
JN1GB34S***100031/Sept. 16, 1991
JN1GB36C***101821/Sept. 16, 1991
JN1GB36S***100167/Sept. 16, 1991



U.S.-Built
1N4*B3*S***828484/Aug. 10, 1991



SERVICE INFORMATION:

Some owners of Sentra(B13) and NX(KB13) 1600/2000 vehicles, built before the applied date, may complain of difficulty when engaging reverse gear. Although the shift lever seems to be in reverse, when the clutch is engaged, a grinding noise is heard and the shift lever moves toward neutral, but - remains in the reverse gate. Depressing the clutch and pulling the shift lever, again, usually moves the lever a short distance to engage reverse.

Nissan has developed an improved reverse idler gear set to reduce reverse gear blocking. The normal frequency of reverse gear blocking is once or twice per 10 attempts to engage reverse. If the customer experiences more frequent blocking incidents, install the C/M Reverse Idler Gear Set and Control Assembly and explain to the customer that the frequency will be reduced to a normal level, not eliminated.

SERVICE PROCEDURE:


IMPORTANT:
Before disassembling the main shaft, confirm that the necessary Nissan Special Tools are available in your shop: Puller 5th Main Gear (Kent-Moore P/N J25681); Puller 3,4, 5 Sync (P/N J22912-01); Drift 5th Main Gear (J25863-01).

1. Remove the transaxle assembly from the vehicle.

2. Continue with the Disassembly procedure, found on Page MT-37 of the 1991 Nissan Sentra Service Manual.



3. Disassemble the transmission, removing the shift forks and rods, input shaft, and mainshaft assembly; while, simultaneously, measuring the clearances specified in the Service Manual.

4. Remove the reverse idler gear, but, do not remove the shaft from the clutch housing because the fitting will be loose.

5. Replace the reverse idler gear and reverse main gear, as a set, with the improved parts.

6. Replace any damaged parts; reinstall all components in the reverse order of removal.

7. Re-install the case and case cover using Loctite Anaerobic Liquid Gasket (Loctite P/N 51813).

NOTE:
To our knowledge, at this time, there is not a functional equivalent compound to this Loctite product.


PARTS INFORMATION:

Hub 1-2, Reverse
Model/Unit Gear - Rev. Idler Main Gear Set
B13/KB13 GA16DE[Sentra/NX1600] 32280-60Y05 32600-D0113
B13/KB13 SR20DE[Sentra SER/NX2000] 32280-50J01 32600-50J00





WARRANTY INFORMATION