DESCRIPTION
The Jet Air System uses an additional valve at the top of each combustion chamber to inject a high velocity stream of air during low throttle operation.
Scheme 16
OPERATION
Air flows to jet valve through 2 intake openings near carburetor throttle valve. On intake stroke, air rushes out of jet valve opening into gases around spark plug and produces a strong swirl action in the combustion chamber.
JET VALVE ADJUSTMENT
Note. Misadjusted jet valve clearance will adversely affect emission levels. Adjust jet valve clearance before adjusting intake valve clearance.
- Before adjusting jet valve, retighten cylinder head bolts cold. See «TORQUE SPECIFICATIONS»(/dodge/ram/i-1981-1993/remont/testing-diagnostics/#air-injection-system__torque-specifications). Adjust jet valve clearance with intake valve adjusting screw fully loosened. (Scheme 17)
- With engine at normal operating temperature, stop engine, remove rocker cover and position appropriate piston at TDC of compression stroke.
Note. Tensile strength of jet valve spring is weak. DO NOT force screw to turn, putting excess pressure on spring.
JET VALVE CLEARANCE SPECIFICATIONS
| Application | In. (mm) |
|---|---|
| Cold | .007 (.17) |
| Hot | .010 (.25) |
JET VALVE CLEARANCE SPECIFICATIONS
Scheme 17
TORQUE SPECIFICATIONS
| Application | Ft. Lbs. (N.m) | |
|---|---|---|
| Colt | ||
| 1.5L | 51-54 (69-73) | |
| 1.6L | 51-54 (69-73) | |
| Colt Vista 2.0L | 65-72 (88-98) | |
| Conquest 2.6L | (1) 65-72 (88-98) | |
| Conquest 2.6L | (2) 11-15 (15-20) | |
| Ram-50 2.0L & 2.6L | 65-72 (88-98) | |
| Raider 2.6L | 65-72 (88-98) | |
| (1) All cylinder head bolts except 2 (8 mm) bolts. (2) 8 mm bolts located at front of cylinder head. | ||
| (1) | All cylinder head bolts except 2 (8 mm) bolts. |
| (2) | 8 mm bolts located at front of cylinder head. |
TORQUE SPECIFICATIONS (COLD)
See also:
• TORQUE SPECIFICATIONS