Engine Mechanical - 4.2L: Specifications — Chevrolet TrailBlazer I (2001-2006)

Fastener Tightening Specifications

Application		Specifications
Application		Metric	English
A/C Line Bracket Nut at Oil Level Indicator Tube		7 N.m	61 lb in
A/C Line Bracket Bolt at Engine Lift Bracket		10 N.m	89 lb in
A/C Compressor Bolts		50 N.m	37 lb ft
A.I.R. Cover Stud		25 N.m	18 lb ft
Camshaft Cap Bolt		12 N.m	106 lb in
Camshaft Cover Bolt		10 N.m	89 lb in
Camshaft Position Actuator Valve Bolt		10 N.m	89 lb in
Connecting Rod Cap Bolt
First Pass		25 N.m	18 lb ft
Final Pass		110 degrees
Coolant Temperature Sensor		20 N.m	15 lb ft
Cooling Fan Hub Nut		56 N.m	41 lb ft
Crankshaft Balancer Bolt
First Pass		150 N.m	110.6 lb ft
Final Pass		180 degrees
Crankshaft Main Bearing Cap Bolt
First Pass		25 N.m	18 lb ft
Final Pass		180 degrees
Crankshaft Position Sensor Bolt		10 N.m	89 lb in
Crankshaft Rear Housing Bolt		10 N.m	89 lb in
Cylinder Head Access Hole Plug - Plastic		5 N.m	44 lb in
Cylinder Head Bolt- 14
First Pass		30 N.m	22 lb ft
Final Pass		155 degrees
Cylinder Head End Bolts - 2 Short
First Pass		7 N.m	62 lb in
Final Pass		60 degrees
Cylinder Head End Bolts - 1 Long
First Pass		7 N.m	62 lb in
Final Pass		120 degrees
Cylinder Head Oil Gallery Plug		38 N.m	28 lb ft
Drive Belt Idler Pulley Bolt		50 N.m	37 lb ft
Drive Belt Tensioner Bolt		50 N.m	37 lb ft
Engine Block Oil Gallery Plug - Front and Rear		80 N.m	60 lb ft
Engine Block Oil Gallery Plug - Side		35 N.m	26 lb ft
Engine Flywheel Bolt
First Pass		25 N.m	18 lb ft
Final Pass		50 degrees
Engine Front Cover Bolt		10 N.m	89 lb in
Engine Front Cover Spacer Bolt		10 N.m	89 lb in
Engine Front Lift Bracket Bolt		50 N.m	37 lb ft
Engine Harness Bracket Bolt		50 N.m	37 lb ft
Engine Mount Bracket Bolt - Engine		50 N.m	37 lb ft
Engine Mount Bracket Bolt - Frame		110 N.m	81 lb ft
Engine Mount Nuts - Upper and Lower		70 N.m	52 lb ft
Engine Protection Shield Bolts		25 N.m	18 lb ft
EVAP Purge Solenoid Valve Bolt		10 N.m	89 lb in
Exhaust Camshaft Actuator Bolt
First Pass		25 N.m	18 lb ft
Final Pass		135 degrees
Exhaust Camshaft Position Sensor Bolt		10 N.m	89 lb in
Exhaust Manifold Bolt
First Pass		20 N.m	15 lb ft
Second Pass		20 N.m	15 lb ft
Final Pass		20 N.m	15 lb ft
Exhaust Manifold Heat Shield Nut		10 N.m	89 lb in
Exhaust Manifold Heat Shield Stud		10 N.m	89 lb in
Exhaust Pipe Bolt		50 N.m	37 lb ft
Front Differential Bolt		85 N.m	63 lb ft
Fuel Injector Rail Bolt		10 N.m	89 lb in
Generator Battery Lead Nut		9 N.m	80 lb in
Heater Inlet Fitting		45 N.m	33 lb ft
Heater Outlet Fitting		45 N.m	33 lb ft
Ignition Coil Bolt		10 N.m	89 lb in
Intake Camshaft Sprocket Bolt
	First Pass	20 N.m	15 lb ft
	Final Pass	100 degrees
Intake Manifold Bolt		10 N.m	89 lb in
Knock Sensor		25 N.m	18 lb ft
Oil Filter - PF 58		30 N.m	23 lb ft
Oil Filter Adapter		50 N.m	37 lb ft
Oil Filter Bypass Hole Plug		14 N.m	124 lb in
Oil Level Indicator Tube Stud		10 N.m	89 lb in
Oil Level Sensor Bolt		10 N.m	89 lb in
Oil Pan Bolt - Ends		10 N.m	89 lb in
Oil Pan Bolt - Sides		25 N.m	18 lb ft
Oil Pan Drain Plug		26 N.m	19 lb ft
Oil Pan Nut		25 N.m	18 lb ft
Oil Pan Stud		11 N.m	97 lb in
Oil Pressure Sensor		20 N.m	15 lb ft
Oil Pump Cover Bolt		10 N.m	89 lb in
Oil Pump Pickup Tube		10 N.m	89 lb in
Oil Pump Pressure Relief Valve		14 N.m	124 lb in
Power Steering Pump Bolt		25 N.m	18 lb ft
Power Steering Pump Bracket Bolt		50 N.m	37 lb ft
Spark Plug		18 N.m	13 lb ft
Starter Motor Bolt		50 N.m	37 lb ft
Starter Motor Nut		50 N.m	37 lb ft
Starter Motor Stud		16 N.m	12 lb ft
Thermostat Housing bolt		10 N.m	89 lb in
Throttle Control Module Bolt		10 N.m	89 lb in
Timing Chain Tensioner Bolt		25 N.m	18 lb ft
Timing Chain Tensioner Guide Bolt		14 N.m	124 lb in
Timing Chain Tensioner Shoe Bolt		25 N.m	18 lb ft
Timing Chain Top Guide Bolt		10 N.m	89 lb in
Torque Converter Bolts		60 N.m	44 lb ft
Transmission Bell Housing Bolts		50 N.m	37 lb ft
Transmission Fluid Tube to Air Adapter Nut		10 N.m	89 lb in
Water Outlet Bolt		10 N.m	89 lb in
Water Pump Bolt		10 N.m	89 lb in
Water Pump Pulley Bolt		25 N.m	18 lb ft

FASTENER TIGHTENING 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