Jeep Grand Cherokee WJ. Manual - part 323
DESCRIPTION
SPECIFICATION
Valve Head Diameter
Intake
48.387 to 48.641 mm
(1.905 to 1.915 in.)
Exhaust
37.973 to 38.227 mm
(1.495 to 1.505 in.)
Valve Face Angle
Intake
46.5°
Exhaust
46.5°
Tip Refinishing (Max.
Allowable)
0.25 mm (0.010 in.)
VALVE SPRINGS
Free Length (Approx.)
48 mm (1.890 in.)
Spring Load
Valve Closed
316 to 351 N @ 41.656
mm
(71 to 79 lbf. @ 1.64 in.)
Valve Open
898.6 to 969.7 N @
30.89 mm
(202 to 218 lbf @ 1.216
in.)
Inside Diameter
21.0 mm to 21.51 mm
(0.827 to 0.847 in.)
Installed Height
41.656 mm (1.64 in.)
PISTONS
Weight (Less Pin)
417 to 429 grams
(14.7 to 15.1 oz.)
Piston Pin Bore
(Centerline
40.61 to 40.72 mm
to Piston Top)
(1.599 to 1.603 in.)
Piston-to-Bore Clearance
0.018 to 0.038 mm
(0.0008 to 0.0015 in.)
Ring Gap Clearance
Top Compression Ring
0.229 to 0.610 mm
(0.0090 to 0.0240 in.)
2nd Compression Ring
0.483 to 0.965 mm
(0.0190 to 0.0380 in.)
Oil Control Steel Rails
0.254 to 1.500 mm
(0.010 to 0.060 in.)
Ring Side Clearance
Compression Rings
0.042 to 0.084 mm
(0.0017 to 0.0033 in.)
Oil Control Rings
0.06 to 0.21 mm
(0.0024 to 0.0083 in.)
DESCRIPTION
SPECIFICATION
Piston Ring Groove
Height
Compression Rings
1.530 to 1.555 mm
(0.0602 to 0.0612 in.)
Oil Control Ring
4.035 to 4.060 mm
(0.1589 to 0.1598 in.)
Piston Ring Groove
Diameter
No.1 Compression Ring
88.39 to 88.65 mm
(3.48 to 3.49 in.)
No.2 Compression Ring
87.63 to 87.88 mm
(3.45 to 3.46 in.)
Oil Control Ring
89.66 to 89.92 mm
(3.53 to 3.54 in.)
Piston Pin Bore Diameter
23.650 to 23.658 mm
(0.9312 to 0.9315 in.)
Piston Pin Diameter
23.637 to 23.640 mm
(0.9306 to 0.9307 in.)
Piston-to-Pin Clearance
0.0102 to 0.0208 mm
(0.0005 to 0.0009 in.)
Piston-to-Pin Connecting
Rod (Press Fit)
8.9 kN (2000 lbf.)
OIL PUMP
Gear-to-Body Clearance
0.051 to 0.102 mm
(Radial)
(0.002 to 0.004 in.)
Gear-to-Body Clearance
(Radial) Preferred
0.051 mm (0.002 in.)
Gear End Clearance
0.051 to 0.152 mm
Plastigage
(0.002 to 0.006 in.)
Gear End Clearance
Plastigage (Preferred)
0.051 mm (0.002 in.)
Gear End Clearance
0.1016 to 0.2032 mm
Feeler Gauge
(0.004 to 0.008 in.)
Gear End Clearance
Feeler Gauge (Preferred)
0.1778 mm (0.007 in.)
Oil Pressure
At Idle Speed
89.6 kPa (13 psi)
At 1600 rpm & Higher
255 to 517 kPa
(37 to 75 psi)
Oil Pressure Relief
517 kPa (75 psi)
9 - 58
4.0L ENGINE
WJ
SPECIFICATIONS (Continued)