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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1149 (ENGINE MECHANICAL (INTRODUCTION) - 3.6L (LY7))COMPONENT LOCATORDISASSEMBLED VIEWS
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Disassembled Views

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Disassembled Views
WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Engine Covers and Component Assemblies Disassembled View (1 of 2) Disassembled View
GM913371Courtesy of GENERAL MOTORS CORP.
Callout Component Name
3 Engine Assembly
6 Intake Manifold Assembly
9 Left Camshaft Cover Assembly
10 Right Camshaft Cover Assembly
14 Engine Front Cover Assembly
15 Oil Pan Assembly
140 Engine Flywheel
141 Engine Flywheel Bolt
390 Crankshaft Balancer
391 Crankshaft Balancer Bolt
601 Left Exhaust Manifold Gasket
602 Left Exhaust Manifold
610 Left Exhaust Manifold Heat Shield
611 Left Exhaust Manifold Heat Shield Bolt
621 Right Exhaust Manifold Gasket
622 Right Exhaust Manifold
625 Cylinder Head Exhaust Manifold Bolt
625 Cylinder Head Exhaust Manifold Bolt
630 Right Exhaust Manifold Heat Shield
631 Right Exhaust Manifold Heat Shield Bolt
704 Ignition Coil Assembly
704 Ignition Coil Assembly
705 Ignition Coil Assembly Bolt
705 Ignition Coil Assembly Bolt
719 Spark Plug
719 Spark Plug
739 Crankshaft Position Sensor Heat Shield
764 Crankshaft Position Sensor Heat Shield Bolt - Large
769 Crankshaft Position Sensor Heat Shield Bolt - Small
Fig 2: Engine Covers and Component Assemblies Disassembled View (2 of 2)
GM913382Courtesy of GENERAL MOTORS CORP.
Callout Component Name
4 Engine Short Block Assembly
7 Left Cylinder Head Assembly
8 Right Cylinder Head Assembly
13 Oil Pump Assembly
16 Oil Filter Adapter Assembly
19 Timing Drive Assembly
302 Left Cylinder Head Gasket
303 Right Cylinder Head Gasket
365 Engine Cooling Thermostat
366 Engine Cooling Thermostat Gasket
367 Engine Cooling Thermostat Housing
368 Engine Cooling Thermostat Housing Bolt
369 Engine Cooling Thermostat Bolt - Short
377 Water Outlet Seal
378 Water Outlet O-ring
379 Water Outlet Bolt
380 Water Outlet
430 Oil Level Indicator
431 Oil Level Indicator Tube
432 Oil Level Indicator Tube O-ring
433 Oil Level Indicator Tube Bolt
434 Oil Level Indicator O-ring
720 Crankshaft Position Sensor
721 Crankshaft Position Sensor O-ring
722 Crankshaft Position Sensor Bolt
723 Knock Sensor
723 Knock Sensor
724 Knock Sensor Bolt
724 Knock Sensor Bolt
Fig 3: Camshaft Cover Assembly Disassembled View
GM911327Courtesy of GENERAL MOTORS CORP.
Callout Component Name
250 Left Camshaft Cover
251 Left Camshaft Cover Gasket
252 Right Camshaft Cover
253 Right Camshaft Cover Gasket
254 Camshaft Cover Spark Plug Port Seal
254 Camshaft Cover Spark Plug Port Seal
255 Camshaft Cover Bolt
255 Camshaft Cover Bolt
256 Camshaft Cover Bolt Insulator
256 Camshaft Cover Bolt Insulator
257 Ignition Coil Bolt Thread Insert
258 Oil Fill Cap
259 Oil Fill O-Ring
259 Oil Fill O-Ring
260 Left Camshaft Cover PCV Fitting
261 Right Camshaft Cover PCV Fitting Orifice
262 Oil Fill Tube
263 Left Camshaft Cover PCV Fitting O-Ring
704 Ignition Coil
704 Ignition Coil
705 Ignition Coil Bolt
705 Ignition Coil Bolt
719 Spark Plug
719 Spark Plug
Fig 4: Camshaft Timing Components Disassembled View - First Design
GM911332Courtesy of GENERAL MOTORS CORP.
Callout Component Name
150 Crankshaft Sprocket
151 Primary Timing Chain Lower Guide
152 Primary Timing Chain Tensioner
153 Primary Timing Chain Tensioner Bolt
154 Primary Timing Chain Lower Guide Bolt
155 Primary Timing Chain
156 Primary Timing Chain Upper Guide
157 Primary Timing Chain Upper Guide Bolt
161 Camshaft Intermediate Drive Shaft Sprocket Bolt
161 Camshaft Intermediate Drive Shaft Sprocket Bolt
164 Primary Timing Chain Tensioner Gasket
165 Left Camshaft Intermediate Drive Shaft Sprocket
166 Right Camshaft Intermediate Drive Shaft Sprocket
170 Left Secondary Timing Chain
171 Left Secondary Timing Chain Guide
172 Left Secondary Timing Chain Guide Bolt
173 Left Secondary Timing Chain Shoe
174 Left Secondary Timing Chain Shoe Bolt
175 Left Secondary Timing Chain Tensioner
176 Left Secondary Timing Chain Tensioner Bolt
177 Left Secondary Timing Chain Tensioner Gasket
180 Right Secondary Timing Chain
181 Right Secondary Timing Chain Guide
182 Right Secondary Timing Chain Guide Bolt
183 Right Secondary Timing Chain Shoe
184 Right Secondary Timing Chain Shoe Bolt
185 Right Secondary Timing Chain Tensioner
186 Right Secondary Timing Chain Tensioner Bolt
187 Right Secondary Timing Chain Tensioner Gasket
190 Left Exhaust Camshaft Position Actuator
191 Left Intake Camshaft Position Actuator
192 Camshaft Position Actuator Bolt
192 Camshaft Position Actuator Bolt
192 Camshaft Position Actuator Bolt
192 Camshaft Position Actuator Bolt
193 Right Exhaust Camshaft Position Actuator
194 Right Intake Camshaft Position Actuator
Fig 5: Camshaft Timing Components Disassembled View - Second Design
GM1549358Courtesy of GENERAL MOTORS CORP.
Callout Component Name
150 Crankshaft Sprocket
151 Primary Timing Chain Lower Guide
152 Primary Timing Chain Tensioner
153 Primary Timing Chain Tensioner Bolt
154 Primary Timing Chain Lower Guide Bolt
155 Primary Timing Chain
156 Primary Timing Chain Upper Guide
157 Primary Timing Chain Upper Guide Bolt
161 Camshaft Intermediate Drive Shaft Sprocket Bolt
161 Camshaft Intermediate Drive Shaft Sprocket Bolt
164 Primary Timing Chain Tensioner Gasket
165 Left Camshaft Intermediate Drive Shaft Sprocket
166 Right Camshaft Intermediate Drive Shaft Sprocket
170 Left Secondary Timing Chain
171 Left Secondary Timing Chain Guide
172 Left Secondary Timing Chain Guide Bolt
173 Left Secondary Timing Chain Shoe
174 Left Secondary Timing Chain Shoe Bolt
175 Left Secondary Timing Chain Tensioner
176 Left Secondary Timing Chain Tensioner Bolt
177 Left Secondary Timing Chain Tensioner Gasket
180 Right Secondary Timing Chain
181 Right Secondary Timing Chain Guide
182 Right Secondary Timing Chain Guide Bolt
183 Right Secondary Timing Chain Shoe
184 Right Secondary Timing Chain Shoe Bolt
185 Right Secondary Timing Chain Tensioner
186 Right Secondary Timing Chain Tensioner Bolt
187 Right Secondary Timing Chain Tensioner Gasket
190 Left Exhaust Camshaft Position Actuator
191 Left Intake Camshaft Position Actuator
192 Camshaft Position Actuator Bolt
192 Camshaft Position Actuator Bolt
192 Camshaft Position Actuator Bolt
192 Camshaft Position Actuator Bolt
193 Right Exhaust Camshaft Position Actuator
194 Right Intake Camshaft Position Actuator
Fig 6: Intake Manifold Disassembled View
GM913385Courtesy of GENERAL MOTORS CORP.
Callout Component Name
281 Clean PCV Hose
283 Dirty PCV Hose
285 PCV Hose O-ring Outer/Larger
286 PCV Hose O-ring Inner/Smaller
503 Upper Intake Manifold
504 Lower Intake Manifold
509 Upper Intake Manifold Bolt - Long
510 Upper Intake Manifold Bolt - Short
519 Lower Intake Manifold to Upper Intake Manifold Dowel Pin
521 Upper Intake Manifold Gasket
522 Lower Intake Manifold Gasket
523 Lower Intake Manifold Bolt
532 Fuel Rail Bolt
560 Fuel Rail
561 Fuel Injector
562 Fuel Injector Retainer
563 Fuel Injector Upper Seal
564 Fuel Injector Lower Seal
565 Fuel Pressure Service Valve Cap
566 Fuel Pressure Service Valve
568 Fuel Rail Feed Hose
700 Fuel Injector Wiring Harness
701 Throttle Body
702 Throttle Body Bolt
703 Throttle Body Gasket
716 Throttle Body Engine Wiring Harness Clip
744 EVAP Purge Solenoid
746 EVAP Purge Solenoid Bolt
750 EVAP Purge Solenoid Tube - Intake Manifold to EVAP Solenoid
751 EVAP Purge Solenoid Tube - EVAP Solenoid to Chassis
752 EVAP Purge Solenoid Bracket
753 EVAP Purge Solenoid Tube Bracket
754 EVAP Purge Solenoid Tube Bracket Bolt
755 Intake Manifold Tuning Valve
756 Intake Manifold Tuning Valve O-ring
757 Intake Manifold Tuning Valve Bolt
758 EVAP Purge Solenoid Tube Clip
759 EVAP Purge Solenoid Tube Clip
765 Fuel Injector Wiring Harness Bracket
766 Fuel Injector Wiring Harness Bracket Bolt
776 BARO Sensor Bolt
777 BARO Sensor
778 BARO Sensor O-ring
789 Throttle Body Heat Shield
Fig 7: Fuel Rail Disassembled View
GM913389Courtesy of GENERAL MOTORS CORP.
Callout Component Name
532 Fuel Rail Bolt
560 Fuel Rail
561 Fuel Injector
562 Fuel Injector Retainer
563 Fuel Injector Upper Seal
564 Fuel Injector Lower Seal
565 Fuel Pressure Service Valve Cap
566 Fuel Pressure Service Valve
568 Fuel Rail Feed Hose
700 Fuel Injector Wiring Harness
765 Fuel Injector Wiring Harness Bracket
766 Fuel Injector Wiring Harness Bracket Bolt
Fig 8: Cylinder Head Assemblies
GM911336Courtesy of GENERAL MOTORS CORP.
Callout Component Name
300 Left Cylinder Head
301 Right Cylinder Head
302 Left Cylinder Head Gasket
303 Right Cylinder Head Gasket
310 Cylinder Head Bolt
311 Cylinder Head Front Bolt
313 Cylinder Head Coolant Hole Threaded Plug
318 Spark Plug Sleeve
319 Cylinder Head Oil Gallery Expansion Plug - 14 mm
319 Cylinder Head Oil Gallery Expansion Plug - 14 mm
320 Exhaust Valve
321 Intake Valve
322 Valve Rocker Arm Assembly
323 Hydraulic Valve Lash Adjuster Assembly
324 Valve Stem Oil Seal
325 Valve Spring
326 Valve Spring Cap
327 Valve Stem Key
328 Cylinder Head Camshaft Front Thrust Bearing Cap
328 Cylinder Head Camshaft Front Thrust Bearing Cap
329 Camshaft Oil Seal Ring
330 Left Exhaust Camshaft
331 Left Intake Camshaft
332 Right Intake Camshaft
333 Right Exhaust Camshaft
336 Cylinder Head Camshaft Cap - Intermediate
337 Cylinder Head Camshaft Cap Bolt
339 Cylinder Head Oil Gallery Check Valve
711 Engine Coolant Temperature Sensor
Fig 9: Engine Front Cover Disassembled View
GM913394Courtesy of GENERAL MOTORS CORP.
Callout Component Name
132 Engine Front Cover Locating Pin
350 Engine Front Cover
351 Engine Front Cover Gasket
352 Engine Front Cover Bolt
353 Engine Front Cover Seal
360 Water Pump Assembly
361 Water Pump Bolt
362 Water Pump Gasket
363 Water Pump Pulley
390 Crankshaft Balancer
391 Crankshaft Balancer Bolt
364 Water Pump Pulley Bolt
725 Camshaft Position Sensor
726 Camshaft Position Sensor O-ring
727 Camshaft Position Sensor Bolt
732 Camshaft Position Actuator Solenoid Valve
733 Camshaft Position Actuator Solenoid Valve Bolt
734 Camshaft Position Actuator Solenoid Valve Seal
Fig 10: Oil Pump Disassembled View
GM902913Courtesy of GENERAL MOTORS CORP.
Callout Component Name
151 Lower Primary Timing Chain Guide
154 Lower Primary Timing Chain Guide Bolt
463 Oil Pump Housing
464 Oil Pump Cover
465 Oil Pump Driven Gear
466 Oil Pump Drive Gear
468 Oil Pump Cover Bolt
470 Oil Pressure Relief Valve Bore Plug
471 Oil Pressure Relief Valve Spring
472 Oil Pressure Relief Valve
474 Oil Pressure Relief Valve Bore Plug Retainer Clip
475 Oil Pump Bolt
Fig 11: Engine Block Assembly Disassembled View
GM911342Courtesy of GENERAL MOTORS CORP.
Callout Component Name
15 Piston and Connecting Rod Assembly
100 Engine Block
110 Crankshaft Bearing Cap
111 Crankshaft Bearing Thrust Cap
114 Crankshaft Bearing Cap Inboard Bolt
115 Crankshaft Bearing Cap Outboard Bolt
116 Crankshaft Bearing Cap Side Bolt - Short
117 Crankshaft Bearing Cap Side Bolt - Long
119 Engine Block Oil Gallery Expansion Plug - 10 mm
120 Crankshaft
121 Crankshaft Sprocket Locating Pin
122 Crankshaft Upper Bearing
123 Crankshaft Lower Bearing
124 Crankshaft Upper Thrust Bearing #3
126 Engine Block Oil Gallery Expansion Plug - 14 mm
127 Engine Block Oil Gallery Threaded Plug - 14 mm
127 Engine Block Oil Gallery Threaded Plug - 14 mm
128 Engine Block Coolant Drain Threaded Plug - 14 mm
129 Engine Block Oil Gallery Threaded Plug - 20 mm
130 Engine Block Core Coolant Expansion Plug - 34.3 mm
131 Transaxle Locating Pin
133 Crankshaft Rear Oil Seal Housing Assembly
134 Crankshaft Rear Oil Seal Housing Assembly Bolt
135 Oil Pan Locating Pin
137 Cylinder Head Locating Pin
490 Piston Oil Nozzle
491 Piston Oil Nozzle Bolt
Fig 12: Piston, Rings, Bearing and Connecting Rod Disassembled View
GM911347Courtesy of GENERAL MOTORS CORP.
Callout Component Name
200 Connecting Rod
201 Connecting Rod Bolt
202 Connecting Rod Bushing
203 Upper Connecting Rod Bearing
204 Lower Connecting Rod Bearing
210 Piston
211 Piston Pin
212 Piston Pin Retainer
212 Piston Pin Retainer
213 Piston Upper Compression Ring
214 Piston Lower Compression Ring
215 Piston Oil Control Rail Ring
216 Piston Oil Control Ring Spacer
Fig 13: Oil Pan Assembly Disassembled View
GM913397Courtesy of GENERAL MOTORS CORP.
Callout Component Name
400 Oil Pan
403 Oil Pan Baffle
405 Oil Pump Suction Pipe
406 Oil Pump Suction Pipe Gasket
407 Oil Pump Suction Pipe Bolt
407 Oil Pump Suction Pipe Bolt
410 Oil Pan Baffle Scraper
411 Oil Pan Baffle Scraper Bolt
412 Oil Pan Drain Plug
413 Oil Pan Drain Plug O-ring
420 Oil Pan Bolt
422 Oil Pan Bolt - Long
712 Engine Oil Level Sensor
713 Engine Oil Level Sensor O-ring
Fig 14: Oil Filter Adapter Disassembled View
GM913399Courtesy of GENERAL MOTORS CORP.
Callout Component Name
440 Oil Filter Adapter
441 Oil Filter Adapter Gasket
442 Oil Filter Adapter Bolt
443 Oil Filter Adapter Bolt - Long
445 Oil Filter Fitting
446 Oil Filter Bypass Valve
449 Oil Filter
728 Engine Oil Pressure Sensor
729 Engine Oil Pressure Sensor O-ring.
RENDER: 1.0x

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  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.