K 3500 1 Ton Pickup 4WD V8-379 6.2L DSL VIN J FI (1983)
Bell Housing: All Technical Service Bulletins
M/T - Hard Shifting, Bearing or Gear Noise
Number:
83-T-52
Section:
VIIb
Date:
June, 1983
Subject: TRANSMISSION TOP COVER TO CLUTCH HOUSING INTERFERENCE - 1982 AND 1983 "C" , "K" AND "P" TRUCKS EQUIPPED
WITH THE 6.2L DIESEL ENGINE (RPO LL4) AND THE 117 MM FOUR-SPEED MANUAL TRANSMISSION (RPO M20)
TO:
ALL CHEVROLET DEALERS
Some 1982 and 1983 "C", "K" and "P" trucks equipped with the 6.2L diesel and four-speed manual transmission may experience any or all of
the following conditions:
^
Hard shifting.
^
Transmission bearing and/or gear noise from improper clutch operation.
FIGURE 1 - LOCATION OF INTERFERENCE
These conditions may be caused by a transmission to engine misalignment. The misalignment can be caused by the top cover of the
transmission protruding beyond the front face of the transmission (see Figure 1).
If a vehicle exhibits any of the conditions listed above, the following procedure should be followed:
1.
Raise the vehicle. Using a .127 mm (.005 in.) shim, check for gaps between the transmission and clutch housing.
2.
If a gap or separation is noted, check for clearance between the top cover and the clutch housing.
If an interference exists, it will be necessary to remove the transmission top cover and grind away the excessive material. The following steps
should be performed to acquire the proper clearances. It will not be necessary to remove the transmission assembly from the vehicle.
1.
Loosen, DO NOT REMOVE, four (4) transmission to clutch housing attaching bolts.
2.
Remove the transmission top cover as outlined in the Chevrolet Light Duty Truck Service Manual (Section 7B2: 117 mm Manual
Transmission).
3.
Grind away the excess material from the forward side of the top cover to allow a proper transmission to clutch housing fit.
NOTICE:
All ground edges are to be deburred.
4.
Wash the cover with a recommended solvent to remove metal contaminants.
5.
Torque the four (4) transmission to clutch housing attaching bolts before installing the top cover. Bolt torque is 100 N-m. (75 ft.lbs.).
6.
Install the reworked top cover and a new gasket. Torque attaching bolts to 27 N-m. (20 ft.lbs.). If the top cover has proper clearances,
there will not be interference with cover alignment or bolt installation.
