Gear Tooth-To-Body Clearance - Jeep J-10 Series 1982 Technical & Service Manual

1B-86 ENGINES
PLASTIGAGE
70298
Fig. 1B-127 Oil Pump Gear End Clearance
Measurement—Plastigage Method
(3) Remove pump cover and determine amount of
clearance by measuring width of compressed Plastigage
with scale on Plastigage envelope. Correct clearance by
this method is 0.002 to 0.008 inch (0.002 preferred) [0.051
to 0.203 mm (0.051 mm preferred)].
Alternate Method:
(1) Place straightedge across gears and pump body.
(2) Select feeler gauge that will fit snugly but freely
between straightedge and pump body (fig. 1B-128). Cor
rect clearance by this method is 0.004 to 0.008 inch (0.008
inch preferred) [0.102 to 0.203 mm (0.203 mm
preferred)].
FEELER
GAUGE
Fig. 1B-128 Oil Pump Gear End Clearance
Measurement—Feeler Gauge Method
NOTE: Ensure gears are up into bodyas far as possible
for measurement.
If gear end clearance is excessive, measure gear
length. If gear length is correct, install thinner gasket. If
gear length is incorrect, replace gears and idler shaft.
6ear Tooth-to-Body Clearance
(1) Insert feeler gauge between gear tooth and
pump body inner wall directly opposite point of gear
mesh. Select feeler gauge that fits snugly but can be
inserted freely (fig. 1B-129).
FEELER
GAUGE
7- •••;. « • iftVjeWi-
41940
Fig. 1B-129 Gear Tooth-to-Body Clearance Measurement
(2) Rotate gears and measure clearance of each
tooth and body in this manner. Correct clearance is
0.0005 to 0.0025 inch (0.0005 inch preferred) or 0.013 to
0.064 mm (0.013 mm preferred).
(3) If gear tooth-to-body clearance is more than
specified, measure gear diameter with micrometer. If
gear diameter is correct and gear end clearance is cor
rect and relief valve is functioning properly, replace
timing case cover. If gear diameter is incorrect, replace
gears and idler shaft.
NOTE: If the oil pump shaft or distributor drive shaft
is broken, inspect for loose oil pump gear-to-shaft fit or
worn front cover. Oversize pump shafts are not
available.
Installation
(1) Install oil pressure relief valve in pump cover
with spring and retaining cap.
(2) Install idler shaft, idler gear and drive gear
assembly.
NOTE: To ensure self-priming of the oil pump, fill
pump with petroleum jelly prior to the installation of
the oil pump cover. Do not use grease of any type.