Engine Mechanical Specifications

ENGINE MECHANICAL SPECIFICATIONS

Application		Specification
Application		Metric	English
General
	Engine Type	In-Line-6
	Displacement	4.2L	256 cu in
	RPO	LL8
	VIN	"S"
	Bore	93 mm	3.66 in
	Stroke	102 mm	4.02 in
	Compression Ratio	10:1
	Engine Compression Test	1482 KPa	215 psi
	Firing Order	1-5-3-6-2-4
	Spark Plug Gap	1.14-1.25 mm	0.044-0.050 in
Block
	Crankshaft Main Bearing Bore Diameter	78.070-78.088 mm	3.0760-3.0766 in
	Cylinder Bore Diameter	92.990-93.006 mm	3.6638-3.6644 in
	Cylinder Bore Out-of-Round	0.013 mm	0.0005 in
	Cylinder Head Deck Surface Flatness	0.08 mm	0.003 in
	Cylinder Liner Recession	0.015 mm	0.0006 in
Camshaft
	Camshaft End Play - Exhaust	0.045-0.215 mm	0.0017-0.0084 in
	Camshaft End Play - Intake	0.051-0.201 mm	0.0020-0.0079 in
	Camshaft Journal Diameter - All Intake and Exhaust #2-#7	26.936-26.960 mm	1.0612-1.0622 in
	Camshaft Journal Diameter - Exhaust #1	29.936-29.960 mm	1.1794-1.1804 in
	Camshaft Journal to Bore Clearance	0.040-0.085 mm	0.0015-0.0033 in
Connecting Rod
	Connecting Rod Bearing Clearance	0.021-0.065 mm	0.0008-0.0025 in
	Connecting Rod Bore Diameter - Bearing End	60.322-60.338 mm	2.3749-2.3755 in
	Connecting Rod Bore Out-of-Round - Bearing End	0.005 mm	0.0002 in
	Connecting Rod Side Clearance	0.05-0.35 mm	0.0019-0.0137 in
Crankshaft
	Crankshaft End Play	0.112-0.388 mm	0.0044-0.0153 in
	Crankshaft Main Bearing Clearance	0.012-0.064 mm	0.0004-0.0025 in
	Crankshaft Main Journal Diameter	69.968-69.984 mm	2.7567-2.7574 in
	Crankshaft Main Journal Out-of-Round	0.005 mm	0.0002 in
	Crankshaft Main Journal Taper	0.005 mm	0.0002 in
Cylinder Head
	Surface Flatness - Block Deck	0.08 mm	0.003 in
	Surface Flatness - Exhaust Manifold Deck	0.08 mm	0.003 in
	Surface Flatness - Intake Manifold Deck	0.08 mm	0.003 in
Exhaust Manifold
	Surface Flatness	0.08 mm	0.003 in
Lubrication System
	Oil Pressure - Minimum	85 KPa	12 psi 1200 RPM
Oil Pump
	Gear Diameter - Drive	73.415-73.370 mm	2.893-2.891 in
	Gear Diameter - Driven	87-86.975 mm	3.428-3.426 in
	Gear Pocket - Depth	15.609-15.584 mm	0.615-0.614 in
	Gear Pocket - Diameter	87.065-87.040 mm	3.430-3.429 in
	Gear Thickness - Drive	15.546-15.521 mm	0.613-0.611 in
	Gear Thickness - Driven	15.360-15.511 mm	0.605-0.611 in
	Lobe Inner Diameter - Maximum	11.9 mm	0.469 in
	Relief Valve-to-Bore Clearance	14.6-14.575 mm	0.575-0.574 in
Piston Rings
	Piston Ring End Gap - First Compression Ring	0.15-0.3 mm	0.0059-0.0118 in
	Piston Ring End Gap - Second Compression Ring	0.36-0.51 mm	0.0142-0.0201 in
	Piston Ring End Gap - Oil Control Ring	0.250-0.760 mm	0.0098-0.0299 in
	Piston Ring to Groove Clearance - First Compression Ring	0.043-0.093 mm	0.0017-0.0037 in
	Piston Ring to Groove Clearance - Second Compression Ring	0.043-0.093 mm	0.0017-0.0037 in
	Piston Ring to Groove Clearance - Oil Control Ring	0.059-0.215 mm	0.0023-0.0085 in
Pistons and Pins
	Piston - Piston Diameter	92.971-93.005 mm	3.6603-3.6616 in
	Piston - Piston Pin Bore Diameter	23.002-23.008 mm	0.9056-0.9058 in
	Piston - Piston to Bore Clearance	-0.015-0.035 mm	-0.0006-0.0014 in
	Pin - Piston Pin Clearance to Connecting Rod Bore	0.001-0.018 mm	0.0004-0.0007 in
	Pin - Piston Pin Clearance to Piston Pin Bore	0.003-0.012 mm	0.00012-0.0005 in
	Pin - Piston Pin Diameter	22.996-22.999 mm	0.9054-0.9055 in
Valve System
	Valves - Valve Face Runout	0.038 mm	0.0015 in
	Valves - Valve Seat Runout	0.05 mm	0.002 in
	Valves - Valve Stem-to-Guide Clearance - Exhaust	0.0375-0.0775 mm	0.0015-0.0030 in
	Valves - Valve Stem-to-Guide Clearance - Intake	0.030-0.065 mm	0.0011-0.0025 in
	Valve Springs - Valve Spring Load - Closed	211.4-233.4 N 35 mm	47.5-52.5 lb 1.701 in
	Valve Springs - Valve Spring Load - Open	579-631 N 24.5 mm	130-142 lb 1.260 in