Engine - New Timing Gear Case And Oil Strainer
REFERENCE ENGINENUMBER 028
DATE 02-06-87
MODEL LN
TITLE - NEW TIMING GEAR CASE AND OIL STRAINER
The timing gear case on the L and 2L engine has been standardized for replacement parts (P/N 11320-54022).
1) On diesel trucks produced prior to February 1982 the timing gear case uses 5 mounting bolts. On diesel trucks produced after February 1982 the timing gear case uses 6 mounting bolts.
Illustration A:
2) The replacement timing gear cover which has 6 mounting bolt holes will have one extra bolt hole for vehicles produced prior to February 1982 (see Illustration A).
Illustration B:
3) The extra bolt hole in the timing gear case must be plugged with a taper screw plug (P/N 90344-51002) so coolant will not leak through the unused hole. (See Illustration B).
TAPER PLUG INSTALLATION PROCEDURE
a) Apply sealer to the taper screw plug before installation.
b) Install the taper screw plug so that it is positioned below the timing gear case surface.
c) New gaskets for the front end plate (P/N 11312-54013) and water pump (P/N 16271-54012) must be used.
Illustration C:
OIL STRAINER MODIFICATION
4) In addition to the timing gear cover change the oil strainer has also been modified to improve engine lubrication on trucks produced after February 1982.
a) If a new timing gear case (P/N 11320-54022) is installed on a vehicle produced prior to February 1982, the oil strainer must also be replaced (P/N 15104-54044 or 15104-54043).
b) The size of the bolt for the oil strainer has been increased from 6 mm to 8 mm.
c) The pitch for the oil strainer installation has been increased from 50 mm to 55 mm.
PART NO. INFORMATION
Previous Part No. New Part No. Part Name
11320-54030 11320-54022 Case Assy, Timing Gear
11311-54021
PARTS SUMMARY FOR VEHICLES PRODUCED PRIOR TO FEBRUARY 1982
P/N Part Name Qty
11320-54022* Case Assy, Timing Gear 1
15104-54044 or Strainer S/Assy, Oil 1
15104-54043
92122-40816 Bolts, Stud 2
90179-08040 Nut 2
15149-54011* Gasket (for Strainer) 1
90344-51002 Taper Screw Plug 1
11312-54013* Gasket, Ft. End Plate 1
16271-54012* Gasket, Water Pump 1
* Parts required when replacing timing gear case on vehicles produced after February 1982.