Engine Mechanical - 4.3L: Specifications — GMC Savana H2500 (2003-2003)

Fastener Tightening Specifications

Application		Ft. Lbs (N.m)
Balance Shaft Driven Gear Bolt
First Tightening Pass		15 (20)
Final Tightening Pass		35 Degrees
Battery Negative Cable-To-Engine Bolt		18 (25)
Belt Idler Pulley Bolt		37 (50)
Camshaft Sprocket Bolt		18 (25)
Connecting Rod Nut
First Tightening Pass		20 (27)
Final Tightening Pass		70 Degrees
Crankshaft Balancer Bolt		70 (95)
Crankshaft Balancer Remover/Installer Bolt (Special Tool J-23523-F)		18 (25)
Crankshaft Bearing Cap Bolt (Preferred Method)
First Tightening Pass		15 (20)
Final Tightening Pass		73 Degrees
Crankshaft Bearing Cap Bolt (Optional Strategy)		77 (105)
Crankshaft Pulley Bolt		43 (58)
Cylinder Head Bolt (Preferred Method)
First Tightening Pass (All Bolts) (1)		22 (30)
Final Tightening Pass (Large Bolts)		75 Degrees
Final Tightening Pass (Medium Bolts)		65 Degrees
Final Tightening Pass (Small Bolts)		55 Degrees
Cylinder Head Bolt (Optional Strategy) (1)
First Tightening Pass		26 (35)
Second Tightening Pass		44 (60)
Final Tightening Pass		66 (90)
Cylinder Head Core Hole Plug		15 (20)
Distributor Clamp Bolt		18 (25)
Dive Belt Idler Pulley Bolt		37 (50)
Drive Belt Tensioner Bolt		37 (50)
Engine Block Coolant Drain Hole Plug		15 (20)
Engine Block Left Rear Oil Gallery Plug		22 (30)
Engine Block Left Side Oil Gallery Plug		15 (20)
Engine Block Oil Gallery Plug		15 (20)
Engine Block Right Rear Oil Gallery Plug		15 (20)
Engine Coolant Temperature Sensor		15 (20)
Engine Flywheel Bolt (2)		74 (100)
Engine Lift Bracket Bolt (Special Tool J-41427)		11 (15)
Engine Lift Front Bracket Stud		26 (35)
Engine Mount Adapter Bolts		37 (50)
Engine Mount-To-Engine Bolts		37 (50)
Engine Mount-To-Frame Bracket Bolts		44 (60)
Engine Oil Pressure Gage Sensor		22 (30)
Engine Oil Pressure Gage Sensor Fitting (Plus Required Angle)		11 (15)
Exhaust Manifold Bolt/Stud
First Tightening Pass		11 (15)
Final Tightening Pass		22 (30)
Fan & Water Pump Pulley Bolt		18 (25)
Generator & Drive Belt Tensioner Bracket-To-Engine Bolt		30 (41)
Generator & Drive Belt Tensioner Bracket-To-Engine Stud		15 (20)
Generator & Drive Belt Tensioner Bracket Stud Nut		30 (41)
Knock Sensor		18 (25)
Oil Fill Tube Lower Support Bolt & Stud		18 (25)
Oil Filter Adapter Bolt		15 (21)
Oil Filter Fitting		41 (55)
Oil Pan Bolt & Nut (3)		18 (25)
Oil Pan Drain Plug		18 (25)
Oil Pump-To-Rear Crankshaft Bearing Cap Bolt		66 (90)
Power Steering Pump Bolt		37 (50)
Power Steering Pump Bracket-To-Engine Bolt		30 (41)
Power Steering Pump Bracket Stud Nut		30 (41)
Power Steering Pump Bracket-To-Engine Stud		15 (20)
Power Steering Pump Rear Bracket-To-Engine Nut		30 (41)
Power Steering Pump Rear Bracket-To-Power Steering Pump Nut		37 (50)
Spark Plug
Initial Installation (NEW Cylinder Head)		22 (30)
All Subsequent Installations		11 (15)
Transmission-To-Oil Pan Bolt		35 (47)
Transmission Control Cable Bracket Bolt		30 (40)
Valve Lifter Pushrod Guide Bolt		12 (16)
Valve Rocker Arm Bolt		22 (30)
Water Outlet Stud		18 (25)
Water Pump Bolt		33 (45)
INCH Lbs. (N.m)
Accelerator Control Cable Bracket Nut		106 (12)
Accelerator Control Cable Bracket-To-Intake Manifold Stud		53 (6)
Accelerator Control Cable Bracket-To-Throttle Body Stud		106 (12)
Air Cleaner Adapter Stud		89 (10)
Air Cleaner Outlet Duct Nut		18 (2)
Balance Shaft Retainer Bolt		106 (12)
Camshaft Retainer Bolt		106 (12)
Crankshaft Position Sensor Bolt		80 (9)
Crankshaft Rear Oil Seal Housing Bolt & Nut		106 (12)
Crankshaft Rear Oil Seal Housing Retainer Stud		53 (6)
Distributor Cap Bolt		21 (2.4)
Engine Coolant Heater Bolt/Screw		18 (2)
Engine Front Cover Bolt		106 (12)
Engine Mount Heat Shield Bolt		53 (6)
Engine Oil Level Sensor		111 (13)
Engine Wiring Harness Bracket Nut-To-Intake Manifold Stud		106 (12)
Engine Wiring Harness Retainer Nut-To-Transmission-To-Engine Stud		89 (10)
Evaporative Emission Canister Purge Solenoid Valve-To-Intake Manifold Nut		89 (10)
Fuel Meter Body Bracket Bolt		89 (10)
Fuel Pipe Bracket Bolt		53 (6)
Fuel Pipe Retainer Nut		27 (3)
Ground Wire-To-Rear Of Left Cylinder Head Bolt		89 (10)
Ground Wire Nut-To-Water Outlet Stud		89 (10)
Ground Wire-To-Rear of Right Cylinder Head Stud		89 (10)
Heater Inlet & Outlet Hose Bracket-To-Oil Fill Tube Lower Support Bolt		44 (5)
Ignition Coil Stud		106 (12)
Lower Intake Manifold Bolt (4)
First Tightening Pass		27 (3)
Second Tightening Pass		106 (12)
Final Tightening Pass		133 (15)
Oil Fill Tube Nut		106 (12)
Oil Fill Tube-To-Oil Fill Tube Lower Support Bolt		44 (5)
Oil Level Indicator Tube Bolt		106 (12)
Oil Level Indicator Tube-To-Oil Fill Tube Lower Support Bolt		44 (5)
Oil Pan Baffle Bolt		106 (12)
Oil Pump Cover Bolt		106 (12)
Power Brake Booster Vacuum Hose Bracket Nut-To-Intake Manifold Stud		97 (11)
Spark Plug Wire Support Bolt		106 (12)
Starter Motor Wiring Harness/Transmission Cooler Pipe Bracket-To-Oil Pan Bolt		80 (9)
Throttle Body Stud		80 (9)
Transmission Cover Bolt		106 (12)
Transmission Fluid Fill Tube-To-Rear Of Engine Bolt		89 (10)
Upper Intake Manifold Stud
First Tightening Pass		44 (5)
Final Tightening Pass		80 (9)
Vacuum Brake Booster Hose Bracket Nut		97 (11)
Valve Rocker Arm Cover Bolt		106 (12)
(1) Tighten bolts/nuts following sequence shown. (Scheme 1) (2) Tighten bolts/nuts following sequence shown. (Scheme 2) (3) Tighten bolts/nuts following sequence shown. (Scheme 3) (4) Tighten bolts/nuts following sequence shown. (Scheme 4)

(1)	Tighten bolts/nuts following sequence shown. (Scheme 1)

(2)	Tighten bolts/nuts following sequence shown. (Scheme 2)

(3)	Tighten bolts/nuts following sequence shown. (Scheme 3)

(4)	Tighten bolts/nuts following sequence shown. (Scheme 4)

TORQUE SPECIFICATIONS

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Engine Mechanical Specifications

Application		Specification
Application		Metric	English
General
	Engine Type	90 degree V6
	Displacement	4.3 L	262 CID
	RPO	LU3
	VIN	X
	Bore	101.60 mm	4.012 in
	Stroke	88.39 mm	3.480 in
	Compression Ratio	9.2:1
	Firing Order	1-6-5-4-3-2
	Spark Plug Gap	1.52 mm	0.060 in
Balance Shaft
	Bearing Journal Diameter - Rear	38.085-38.100 mm	1.4994-1.500 in
	Bushing Bore Diameter - Rear	0.050-0.088 mm	0.0020-0.0035 in
Block
	Crankshaft Main Bearing Bore Out-of-Round	0.050 mm	0.002 in
	Cylinder Bore Diameter	101.618-101.643 mm	4.0007-4.0017 in
	Cylinder Bore Out-of-Round - Production	0.017 mm	0.0007 in
	Cylinder Bore Out-of-Round - Service	0.05 mm	0.002 in
	Cylinder Bore Taper - Production Relief Side	0.025 mm	0.0010 in
	Cylinder Bore Taper - Production Thrust Side	0.012 mm	0.0005 in
	Cylinder Bore Taper - Service	0.025 mm	0.0010 in
	Cylinder Head Deck Surface Flatness	0.050-0.152 mm	0.002-0.006 in
Camshaft
	Camshaft End Play	0.0254-0.2286 mm	0.0010-0.0090 in
	Camshaft Journal Diameter	47.440-47.490 mm	1.8677-1.8696 in
	Camshaft Journal Out-of-Round	0.025 mm	0.001 in
	Camshaft Lobe Lift - Exhaust	7.20-7.30 mm	0.283-0.287 in
	Camshaft Lobe Lift - Intake	6.97-7.07 mm	0.274-0.278 in
	Camshaft Runout	0.065 mm	0.0026 in
Connecting Rod
	Connecting Rod Bearing Clearance - Production	0.038-0.078 mm	0.0015-0.0031 in
	Connecting Rod Bearing Clearance - Service	0.025-0.063 mm	0.0010-0.0025 in
	Connecting Rod Side Clearance	0.15-0.44 mm	0.006-0.017 in
Crankshaft
	Connecting Rod Journal Diameter	57.116-57.148 mm	2.2487-2.2497 in
	Connecting Rod Journal Out-of-Round - Production	0.005 mm	0.0002 in
	Connecting Rod Journal Out-of-Round - Service	0.025 mm	0.0010 in
	Connecting Rod Journal Taper - Production	0.00508 mm	0.00030 in
	Connecting Rod Journal Taper - Service	0.025 mm	0.0010 in
	Crankshaft End Play	0.050-0.20 mm	0.002-0.008 in
	Crankshaft Main Bearing Clearance #1 - Production	0.02-0.05 mm	0.0008-0.0020 in
	Crankshaft Main Bearing Clearance #2, #3, and #4 - Production	0.028-0.058 mm	0.0011-0.0023 in
	Crankshaft Main Bearing Clearance #1 - Service	0.0254-0.05 mm	0.0010-0.0020 in
	Crankshaft Main Bearing Clearance #2, #3, and #4 - Service	0.025-0.063 mm	0.0010-0.0025 in
	Crankshaft Main Journal Diameter #1	62.199-62.217 mm	2.4488-2.4495 in
	Crankshaft Main Journal Diameter #2 and #3	62.191-62.215 mm	2.4485-2.4494 in
	Crankshaft Main Journal Diameter #4	62.179-62.203 mm	2.4480-2.4489 in
	Crankshaft Main Journal Out-of-Round - Production	0.005 mm	0.0002 in
	Crankshaft Main Journal Out-of-Round - Service	0.025 mm	0.0010 in
	Crankshaft Main Journal Taper	0.007 mm	0.0003 in
Exhaust Manifold
	Surface Flatness - Flange to Flange	0.25 mm	0.010 in
	Surface Flatness - Individual Flange	0.05 mm	0.002 in
Intake Manifold
	Surface Flatness	0.10 mm	0.004 in
Lubrication System
	Oil Pressure - at 1,000 RPM	42 kPa	6 psi
	Oil Pressure - at 2,000 RPM	125 kPa	18 psi
	Oil Pressure - at 4,000 RPM	166kPa	24 psi
Piston Rings
	Piston Ring End Gap - First Compression Ring - Production	0.25-0.40 mm	0.010-0.016 in
	Piston Ring End Gap - Second Compression Ring - Production	0.38-0.58 mm	0.015-0.023 in
	Piston Ring End Gap - Oil Control Ring - Production	0.25-0.76 mm	0.010-0.029 in
	Piston Ring End Gap - First Compression Ring - Service	0.25-0.50 mm	0.010-0.020 in
	Piston Ring End Gap - Second Compression Ring - Service	0.38-0.80 mm	0.015-0.031 in
	Piston Ring End Gap - Oil Control Ring - Service	0.005-0.090 mm	0.0002-0.0035 in
	Piston Ring to Grooce Clearance - First Compression Ring - Production	0.030-0.070 mm	0.0012-0.0027 in
	Piston Ring to Groove Clearance - Second Compression Ring - Production	0.076-0.280 mm	0.0030-0.0110 in
	Piston Ring to Groove Clearance - Oil Control Ring - Production	0.046-0.196 mm	0.0018-0.0077 in
	Piston Ring to Groove Clearance - First Compression Ring - Service	0.030-0.085 mm	0.0012-0.0033 in
	Piston Ring to Groove Clearance - Second Compression Ring - Service	0.030-0.085 mm	0.0012-0.0033 in
	Piston Ring to Groove Clearance - Oil Control Ring - Service	0.076-0.200 mm	0.0030-0.0079 in
Pistons and Pins
	Piston - Piston to Bore Clearance - Production	0.018-0.061 mm	0.0007-0.0024 in
	Piston - Piston to Bore Clearance - Service	0.075 mm	0.0029 in
	Pin - Piston Pin Clearance to Connecting Rod Bore - Press Fit	0.012-0.048 mm	0.0005-0.0019 in
	Pin - Piston Pin Clearance to Piston Pin Bore - Production	0.013-0.023 mm	0.0005-0.0009 in
	Pin - Piston Pin Clearance to Piston Pin Bore - Service	0.025 mm	0.0010 in
	Pin - Piston Pin Diameter	23.545-23.548 mm	0.9270-0.9271 in
Valve System
	Valves - Valve Face Angle	45 degrees
	Valves - Valve Seat Angle	46 degrees
	Valves - Valve Seat Runout	0.05 mm	0.002 in
	Valves - Valve Seat Width - Intake	1.016-1.651 mm	0.040-0.065 in
	Valves - Valve Seat Width - Exhaust	1.651-2.489 mm	0.065-0.098 in
	Valves - Valve Stem Oil Seal Installed Height	1-2 mm	0.03937-0.07874 in
	Valves - Valve Stem-to-Guide Clearance - Intake - Production	0.025-0.069 mm	0.0010-0.0027 in
	Valves - Valve Stem-to-Guide Clearance - Intake - Service	0.025-0.094 mm	0.0010-0.0037 in
	Valves - Valve Stem-to-Guide Clearance - Exhaust - Production	0.025-0.069 mm	0.0010-0.0027 in
	Valves - Valve Stem-to-Guide Clearance - Exhaust - Service	0.025-0.094 mm	0.0010-0.0037 in
	Rocker Arms - Valve Rocker Arm Ratio	1.5:1
	Valve Springs - Valve Spring Free Length	51.3 mm	2.02 in
	Valve Springs - Valve Spring Installed Height - Intake	42.92-43.43 mm	1.670-1.700 in
	Valve Springs - Valve Spring Installed Height - Exhaust	42.92-43.43 mm	1.670-1.700 in
	Valve Springs - Valve Spring Load - Closed	338-374 N 43.2 mm	76-84 lb 1.70 in
	Valve Springs - Valve Spring Load - Open	832-903 N 32.3 mm	187-203 lb 1.27 in

ENGINE MECHANICAL SPECIFICATIONS

Scheme 5

Scheme 5: Sealers, Adhesives, and Lubricants

Scheme 6

Scheme 6: Disassembled Views

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 11: Engine Identification

Scheme 12

Scheme 13

The Vehicle Identification Number (VIN) Derivative is located on the left side rear of the engine block (1) or on the right side rear (2) and typically is a nine digit number stamped or laser etched onto the engine at the vehicle assembly plant. The first digit identifies the division. The second digit identifies the model year. The third digit identifies the assembly plant. The fourth through ninth digits are the last six digits of the Vehicle Identification Number (VIN).
Engines built at the Tonawanda engine plant have the engine identification number located at the right front top of the engine block. The first digit (1) is the source code. The second and third digits (2) are the month of build. The forth and fifth digits (3) are the date of build. The sixth, seventh, and eighth digits (4) are the broadcast code.
Engines built at the Romulus engine plant have the engine identification number located at the right front top of the engine block. The first digit (1) is the source code. The second and third digits (2) are the month of build. The fourth digit (3) is the hour of the build. The fifth and sixth digits (4) are the date of build. The seventh, eighth, and ninth digits (5) are the broadcast code.

Torque Values and/or Fastener Tightening Strategies

Cylinder head bolts, the crankshaft bearing cap bolts, the connecting rod bolts, and balance shaft bolt apply a torque angle strategy. In an on-vehicle situation where a torque angle meter may not fit into the vehicle packaging, a three step tightening process may be followed using a torque wrench.
Certain fasteners should not be reused. Bolts, studs, or other fasteners that must be replaced will be called out in the specific service procedure.

Changed Engine Specifications

Crankshaft Main Bearing Bore Out-of-Round spec is now 0.05 mm (0.002 in).
Cylinder Bore Out-of-Round-Production spec is now 0.017 mm (0.0007 in).
Cylinder Head Deck Surface Flatness spec is now 0.050-0.152 mm (0.002-0.006 in).
Piston Ring-to-Groove Clearance-Second Compression Ring-Production spec is now 0.076-0.280 mm (0.0030-0.0110 in).
Piston Ring-to-Groove Clearance-Oil Control Ring-Service spec is now 0.076-0.200 mm (0.0030-0.0079 in).

Engine Mechanical - 4.3L: Specifications GMC Savana H2500

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Engine Mechanical Specifications

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Torque Values and/or Fastener Tightening Strategies

Changed Engine Specifications

More articles — Engine Mechanical - 4.3L

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