INTRODUCTION
Note. Sierra and Silverado models include Cab & Chassis Sierra and Cab & Chassis Silverado. Savana models include Cutaway, RV Cutaway, Savana Special and Savana Camper Special.
Use this article to quickly find specifications related to servicing and on-vehicle adjustments. This article may be used for quick reference when you are familiar with proper adjustment procedures and only need a specification.
CAPACITIES
| Application | (2) Quantity Qts. (L) |
|---|
| All Models | 6.0 (5.7) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Includes oil filter capacity. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (2) | Includes oil filter capacity. |
FLUID CAPACITY (CRANKCASE) (1)
| Application | (2) Quantity Qts. (L) |
|---|
| Chevy Express (Gasoline), Hummer H2 & Savana | 14.8 (14.0) |
| Chevy Express (CNG & Bi-Fuel) |
| With Rear Heater | 21.0 (20.0) |
| Without Rear Heater | 18.0 (17.0) |
| Escalade & Yukon |
| A/T | 15.8 (15.0) |
| A/T With Optional Oil Cooler | 15.4 (14.6) |
| Sierra & Silverado |
| A/T | 14.8 (14.0) |
| A/T With Optional Oil Cooler | 14.4 (13.6) |
| M/T | 15.2 (14.4) |
| M/T With Optional Oil Cooler | 14.8 (14.0) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Includes heater. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
FLUID CAPACITY (COOLING SYSTEM) (1)
| Application | (2) Quantity Qts. (L) |
|---|
| All Models |
| 4L60-E | 5.0 (4.7) |
| 4L80-E | 7.7 (7.3) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark with Dexron-III, unless specified otherwise. (2) Drain and refill capacity only. Does not include torque converter, unless specified otherwise. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark with Dexron-III, unless specified otherwise. |
| (2) | Drain and refill capacity only. Does not include torque converter, unless specified otherwise. |
FLUID CAPACITY (AUTOMATIC TRANSMISSION) (1)
| Application | Quantity Pts. (L) |
|---|
| Sierra & Silverado |
| NV3500 | (2) 4.8 (2.3) |
| NV4500 | (3) 8.0 (3.8) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Synchromesh Transmission Fluid (GM 12345349). (3) SAE 75W-85 GL4 Synthetic Lubricant (GM 12346190). |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (2) | Synchromesh Transmission Fluid (GM 12345349). |
| (3) | SAE 75W-85 GL4 Synthetic Lubricant (GM 12346190). |
FLUID CAPACITY (MANUAL TRANSMISSION) (1)
SERVICE INTERVALS & SPECIFICATIONS
| Component | Interval (Miles) |
|---|
| Sierra & Silverado |
| Accessory Drive Belt | (1) 60,000 |
| Air Filter | 30,000 |
| Automatic Transfer Case Fluid | 50,000 |
| Automatic Transmission Fluid & Filter | (2) |
| CNG In-Line Filter (CNG Engines) | 60,000 |
| Engine Coolant | 150,000 |
| Fuel Filter | 30,000 |
| Manual Transmission Fluid | 150,000 |
| Oil & Oil Filter | (3) |
| PCV | (1) 100,000 |
| Spark Plugs | (4) |
| Except Sierra & Silverado |
| Accessory Drive Belt | (1) 60,000 |
| Air Filter | 30,000 |
| Automatic Transfer Case Fluid | 50,000 |
| Automatic Transmission Fluid & Filter | (2) |
| CNG In-Line Filter (CNG Engines) | 60,000 |
| Engine Coolant | 150,000 |
| Fuel Filter | 30,000 |
| Oil & Oil Filter | (3) |
| PCV | (1) 100,000 |
| Spark Plugs | (4) |
| (1) Inspect and replace as necessary. (2) If vehicle's GVWR is greater than 8600 lbs (3900 kg) or is used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles. (3) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever comes first. (4) On CNG engines, replace at 60,000 miles. On gasoline engines, replace at 100,000 miles. |
| (1) | Inspect and replace as necessary. |
| (2) | If vehicle's GVWR is greater than 8600 lbs (3900 kg) or is used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles. |
| (3) | If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever comes first. |
| (4) | On CNG engines, replace at 60,000 miles. On gasoline engines, replace at 100,000 miles. |
BELT TENSION
Adjustment of serpentine belt is not necessary. Belt tension is maintained by spring-tensioned idler pulley (some equipped with belt wear indicator).
ENGINE COMPRESSION
| Application | Specification - psi (kPa) |
|---|
| Normal Compression Pressure | (1) |
| Minimum Compression Pressure | (1) |
| Compression Variance | (2) |
| (1) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (689.5 kPa). (2) Information is not available from manufacturer. |
| (1) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (689.5 kPa). |
| (2) | Information is not available from manufacturer. |
ENGINE COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Engine is equipped with hydraulic lifters. Adjustment is not required.
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| All Models | 1000 Per Ft. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Type | Part No. |
|---|
| All Models | AC | 25171803 |
| NGK | 12567759 |
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|
| All Models | Iridium .040 in. (1.04 mm) Platinum .060 in. (1.52 mm) | Tighten to 15 ft. lbs. (20 N.m) when using NEW cylinder head. Tighten to 11 ft. lbs. (15 N.m) for all subsequent installations. |
SPARK PLUG SPECIFICATIONS
Scheme 2
IGNITION TIMING
All models are equipped with an electronic computer-controlled ignition system. Ignition timing is not adjustable.
FUEL PUMP
| Application | Psi (kPa) |
|---|
| Bi-Fuel Engines (1) | (2) 130-200 (826-1379) |
| CNG Engines | (3) 110-210 (758-1448) |
| Gasoline Engines | 55-62 (379.2-427.5) |
| (1) Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. (2) Pressure reading as shown under FRP display on a scan tool. (3) Pressure checked at Intermediate Pressure Regulator (IPR) test port using CNG Electronic Pressure Gauge Kit (J-39970). |
| (1) | Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. |
| (2) | Pressure reading as shown under FRP display on a scan tool. |
| (3) | Pressure checked at Intermediate Pressure Regulator (IPR) test port using CNG Electronic Pressure Gauge Kit (J-39970). |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| Bi-Fuel & CNG Engines (2) | 1-2 |
| Gasoline Engines | 11-14 |
| (1) Injector resistance specification is at 50-95°F (10-35°C). (2) Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
| (2) | Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by Powertrain Control Module (PCM). Idle speed is preset by manufacturer and is not adjustable.
THROTTLE POSITION SENSOR
Note. Throttle Position (TP) sensor is not adjustable. For further testing procedures, perform TP sensor related diagnostic test. See appropriate SELF-DIAGNOSTICS article.
Note. Vehicles equipped with CNG engines are not equipped with a TP sensor.
| Application | (1) Voltage |
|---|
| All Gasoline Engines | 1.0-4.0 |
| (1) Voltage range is from idle to wide open throttle. |
| (1) | Voltage range is from idle to wide open throttle. |
THROTTLE POSITION SENSOR VOLTAGE
