INTRODUCTION
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
| Cold Crank Amps@ 0°F (-18°C) | Reserve Capacity (Minutes) |
|---|
| 500 | 125 |
| 550 | 130 |
| 600 | 115 |
| 690 | 115 |
| 750 | 160 |
| 1075 | 200 |
| Application | (1) Quantity - Qts. (L) |
|---|
| Crankcase | (2) 7.0 (6.5) |
| Standard |
| With A/C | 27.5 (26.0) |
| Without A/C | 25.0 (23.5) |
| Heavy Duty |
| With A/C | 28.5 (27.0) |
| Without A/C | 26.4 (25.0) |
| Automatic Transmission (Dexron-III) (3) |
| 4L60-E | 5.0 (4.7) |
| 4L80-E | 7.7 (7.3) |
| Manual Transmission |
| NVG 3500 | (4) 2.2 (2.0) |
| NVG 4500 | (5) 4.0 (3.8) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Includes oil filter capacity. (3) Drain and refill capacity only. Does not include torque converter. (4) Synchromesh Transmission Fluid (GM 12345349). (5) Castrol Syntorq LT transmission fluid. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (2) | Includes oil filter capacity. |
| (3) | Drain and refill capacity only. Does not include torque converter. |
| (4) | Synchromesh Transmission Fluid (GM 12345349). |
| (5) | Castrol Syntorq LT transmission fluid. |
SERVICE INTERVALS & SPECIFICATIONS
| Component | Interval (Miles) |
|---|
| Accessory Drive Belt | 60,000 |
| Air Cleaner | (1) |
| Engine Coolant | 150,000 |
| Fuel Filter | 30,000 |
| Oil & Filter | 7500 |
| Spark Plugs | 100,000 |
| (1) No scheduled replacement interval available at time of publication. Check and replace as necessary. |
| (1) | No scheduled replacement interval available at time of publication. Check and replace as necessary. |
BELT TENSION
| Application | Tension - Lbs. (kg) |
|---|
| All Models | (1) |
| (1) Serpentine belt tension is maintained automatically by spring-tensioned idler pulley. Adjustment not necessary. |
| (1) | Serpentine belt tension is maintained automatically by spring-tensioned idler pulley. Adjustment not necessary. |
ENGINE COMPRESSION
| Application | Compression Ratio |
|---|
| 7.4L (VIN J) | 9.0:1 |
VALVE CLEARANCE
Note. All models are equipped with hydraulic lifters. Adjustments are not required.
IGNITION COIL
| Application | Ohms |
|---|
| All Models | 500-1500 |
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| All Models | 30,000 Maximum |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Part No. |
|---|
| All Models | AC 41-932 |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| 7.4L (VIN J) | .060 (1.52) | 15 (20) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
Note. For firing order, see illustration. (Scheme 5)
Firing Order. Scheme 5
IGNITION TIMING
Note. Ignition timing is controlled by control module and is not adjustable.
FUEL PUMP
| Application | Psi (kg/cm 2 ) |
|---|
| CSI | 60-66 (4.2-4.6) |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| All | 11.8-12.6 |
| (1) Injector resistance specification is at 50-95°F (10-35°C). |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Note. Idle mixture on fuel injected models is controlled by control module and is not adjustable. Controlled idle speed and IAC count can be checked using scan tool. See CONTROLLED IDLE SPEED & IAC COUNT table. For controlled idle speed adjustment procedures, see the ADJUSTMENTS - 7.4L article.
| Application | Idle RPM | (1) IAC Counts |
|---|
| Auto. Trans. (2) | 575-625 | Varies |
| Man. Trans. (3) | 700-750 | Varies |
| (1) Add 2 counts for engines with less than 500 miles. V8 engines, add 2 counts for every 1000 ft. above sea level. (2) Automatic transmission in Drive. (3) Manual transmission in Neutral. Tech 1 scan tool will display "RDL" with transmission in Neutral. |
| (1) | Add 2 counts for engines with less than 500 miles. V8 engines, add 2 counts for every 1000 ft. above sea level. |
| (2) | Automatic transmission in Drive. |
| (3) | Manual transmission in Neutral. Tech 1 scan tool will display "RDL" with transmission in Neutral. |
CONTROLLED IDLE SPEED & IAC COUNT
THROTTLE POSITION (TP) SENSOR
TP sensor output voltage should be .85 volt or less at idle (closed throttle) and is not adjustable.
