SPECIFICATIONS
ENGINE SPECIFICATIONS
ENGINE DESCRIPTION
DESCRIPTION SPECIFICATION
Engine Type In-line 4 Cylinder
Bore and Stroke 98.4 x 81.0 mm
(3.88 x 3.19 in.)
Displacement 2.5L (150 cu. in.)
Compression Ratio 9.1:1
Compression Pressure
Range
827 to 1,034 kPa
(120 to 150 psi)
Max. Variation Between
Cylinders
206 kPa (30 psi)
Firing Order 1–3–4–2
Lubrication Pressure Feed–Full Flow
Filtration
Cooling System Liquid Cooled–Forced
Circulation
Cylinder Block Cast Iron
Crankshaft Cast Nodular Iron
Cylinder Head Cast Iron
Camshaft Cast Iron
Pistons Aluminum Alloy
Cylinder Combustion
Cavity
Double Quench
Connecting Rods Cast Iron
CAMSHAFT
Hydraulic Tappet
Clearance
Zero Lash
Bearing Clearance 0.025 - 0.076 mm
(0.001 - 0.003 in.)
DESCRIPTION SPECIFICATION
Bearing Journal Diameter
No. 1 51.54 - 51.56 mm
(2.029 - 2.030 in.)
No. 2 51.28 - 51.31 mm
(2.019 - 2.020 in.)
No. 3 51.03 - 51.05 mm
(2.009 - 2.010 in.)
No. 4 50.78 - 50.80 mm
(1.999 - 2.000 in.)
Base Circle Runout
(Max)
0.03 mm
(0.001 in.)
Camshaft Lobe Lift
Exhaust 6.579 mm (0.259 in.)
Intake 6.477 mm (0.255 in.)
Camshaft Duration
Intake 253.3°
Exhaust 259°
VALVES
Valve Lift
Exhaust 10.528 mm (0.4145 in.)
Intake 10.350 mm (0.4075 in.)
Intake Valve Timing
Opens 15.4° (BTDC)
Closes 58° (ABDC)
Duration 253.3°
Exhaust Valve Timing
Opens 52.8° (BBDC)
Closes 26.2° (ATDC)
Duration 259°
Valve Overlap 41.6°
Valve Lenght (Overall)
Intake 124.435 - 125.070 mm
(4.899 - 4.924 in.)
Exhaust 125.120 - 125.755 mm
(4.927 - 4.952 in.)
Valve Stem Diameter 7.899 - 7.925 mm
(0.311 - 0.312 in.)
XJ 2.5L ENGINE 9 - 55
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