Engine Mechanical Specifications. Chevrolet TrailBlazer

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 TrailBlazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General Data
Engine Type	In-Line-6
Displacement	4.2 L	256 cu in
RPO (VIN Code)	LL8
Spark Plug Gap
Maximum	1.25 mm	0.050 in
Minimum	1.14 mm	0.044 in
Bore	93 mm	3.66 in
Stroke	102 mm	4.02 in
Compression Ratio	10 : 1
Firing Order	1-5-3-6-2-4
Oil Pressure (At the sending unit) Warm - Minimum	85 kPa	12 psi @ 1200 RPM
Cylinder Bore
Diameter	92.990-93.006 mm	3.6638-3.6644 in
Out Of Round - Maximum	0.013 mm	0.0005 in
Cylinder Liner Recession - Maximum	0.015 mm	0.0006 in
Piston & Pin
Piston Diameter - 38 mm (1.4961 in) down from top	92.963-92.977 mm	3.6627-3.6633 in
Piston to Bore Clearance	0.013-0.043 mm	0.0004-0.0017 in
Piston to Pin Clearance	0.003-0.012 mm	0.00012-0.0005 in
Pin Bore	23.002-23.008 mm	0.9056-0.9058 in
Piston Pin Diameter	22.996-22.999 mm	0.9054-0.9055 in
Piston Ring
Top Groove to Ring Side Clearance	0.043-0.093 mm	0.0017-0.0037 in
Second Groove to Ring Side Clearance	0.043-0.093 mm	0.0017-0.0037 in
Oil Control Groove to Ring Side Clearance	0.059-0.215 mm	0.0023-0.0085 in
Top Ring Gap - 93 mm (3.66 in) down from top of cylinder	0.2-0.4 mm	0.0079-0.0157 in
Second Ring Gap - 93 mm (3.66 in) down from top of cylinder	0.3-0.5 mm	0.0118-0.0197 in
Oil Control Ring Gap - 93 mm (3.66 in) down from top of cylinder	0.250-0.760 mm	0.0098-0.0299 in
Crankshaft
Main Journal Diameter	69.968-69.984 mm	2.7567-2.7574 in
Main Journal Taper - Maximum	0.005 mm	0.0002 in
Out Of Round - Maximum	0.005 mm	0.0002 in
Cylinder Block Main Bearing Bore Diameter	78.070-78.088 mm	3.0760-3.0766 in
Crankshaft Main Bearing Inside Diameter	69.997-70.031 mm	2.7579-2.7592 in
Main Bearing Clearance	0.012-0.064 mm	0.0004-0.0025 in
Crankshaft End Play	0.112-0.388 mm	0.0044-0.0153 in
Connecting Rod
Connecting Rod Bearing Journal Diameter	56.693-56.707 mm	2.2337-2.2342 in
Connecting Rod Bearing Journal Out Of Round - Maximum	0.005 mm	0.0002 in
Connecting Rod Bearing Bore Diameter	60.322-60.338 mm	2.3749-2.3755 in
Connecting Rod Inside Bearing Diameter	56.729-56.757 mm	2.2351-2.2362 in
Connecting Rod Bearing Journal Clearance	0.021-0.065 mm	0.0008-0.0025 in
Connecting Rod Side Clearance	0.05-0.35 mm	0.0019-0.0137 in
Connecting Rod Bushing to Pin Clearance	0.001-0.018 mm	0.0004-0.0007 in
Connecting Rod Inside Bushing Diameter	23.000-23.014 mm	0.9055-0.9060 in
Camshaft
Journal Diameter - All Intake and Exhaust #2 - #7	26.936-26.960 mm	1.0612-1.0622 in
Journal Diameter - Exhaust #1	29.936-29.960 mm	1.1794-1.1804 in
Camshaft Bore Diameter - All Intake and Exhaust #2 - #7	27.000-27.021 mm	1.0638-1.0646 in
Camshaft Bore Diameter - Exhaust #1	30.000-30.021 mm	1.1820-1.1828 in
Journal Clearance	0.040-0.085 mm	0.0015-0.0033 in
Camshaft Endplay - Intake	0.051-0.201 mm	0.0020-0.0079 in
Camshaft Endplay - Exhaust	0.045-0.215 mm	0.0017-0.0084 in
Valve System
Stationary Lash Adjuster	Hydraulic
Valve Seat Runout - Maximum	0.05 mm	0.002 in
Valve Face Runout - Maximum	0.038 mm	0.0015 in
Valve Stem Clearance - Intake	0.030-0.065 mm	0.0011-0.0025 in
Valve Stem Clearance - Exhaust	0.0375-0.0775 mm	0.0015-0.0030 in
Valve Spring
Valve Springs Load (Closed)	211.4-233.4 N @ 35.0 mm	47.5-52.5 lb @ 1.701 in
Valve Springs Load (Open)	579.0-631.0 N @ 24.5 mm	130-142 lb @ 1.260 in
Oil Pump
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
Oil Pump Drive Gear
Outer Diameter Tolerance	73.415-73.370 mm	2.893-2.891 in
Width	15.546-15.521 mm	0.613-0.611 in
Oil Pum Driven Gear
Outer Diameter Tolerance	87.000-86.975 mm	3.428-3.426 in
Width	15.360-15.511 mm	0.605-0.611 in
Lobe Inner Diameter - Maximum	11.9 mm	0.469 in
Oil Pump Gear
Valve to Bore Clearance	14.6-14.575 mm	0.575-0.574 in

Application	Specification
Application	Metric	English
General Data
Engine Type	In-Line-6
Displacement	4.2 L	256 cu in
RPO (VIN Code)	LL8
Bore	93 mm	3.66 in
Stroke	102 mm	4.02 in
Compression Ratio	10 : 1
Firing Order	1-5-3-6-2-4
Oil Pressure (At the sending unit) Warm - Minimum	85 kPa	12 psi @ 1200 RPM
Spark Plug Gap
Maximum	1.25 mm	0.050 in
Minimum	1.14 mm	0.044 in