Jeep Cherokee 2000, Service Manual

Page: 807 / 1528

DESCRIPTION SPECIFICATION
Flatness Max. 0.20 mm - max. for total
length
(0.008 in. max. for total
length)
ROCKER ARMS, PUSH RODS & TAPPETS
Rocker Arm Ratio 1.6:1
Push Rod Length 244.856 to 245.364 mm
(Pink) (9.640 to 9.660 in.)
Push Rod Diameter 7.92 to 8.00 mm
(0.312 to 0.315 in.)
Hydraulic Tappet
Diameter
22.962 to 22.974 mm
(0.904 to 0.9045 in.)
Tappet-to-Bore Clearance 0.025 to 0.063 mm
(0.001 to 0.0025 in.)
VALVES
Valve Length (Overall)
Intake 122.479 to 122.860 mm
(4.822 to 4.837 in.)
Exhaust 122.860 to 123.241 mm
(4.837 to 4.852 in.)
Valve Stem Diameter 7.899 to 7.925 mm
(0.311 to 0.312 in.)
Stem-to-Guide Clearance 0.025 to 0.076 mm
(0.001 to 0.003 in.)
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.)
DESCRIPTION SPECIFICATION
VALVE SPRINGS
Free Length (Approx.) 47.65 mm (1.876 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.)
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.)
XJ
4.0L ENGINE 9 - 117
SPECIFICATIONS (Continued)