D21 Hardbody SE King Cab 4WD L4-2389cc 2.4L SOHC MFI (KA24E) (1997)
Valve Spring: Testing and Inspection
SQUARENESS
1. Dimension "S" is squareness (out-of-square). Measure dimension "S":
The outer spring
Intake: less than 2.5 mm (0.098 inch).
Exhaust: less than 2.3 mm (0.091 inch).
The inner spring
Intake: less than 2.3mm (0.091 inch).
Exhaust: less than 2.1 mm (0.083 inch).
2. If it exceeds the limit, replace the spring.
PRESSURE
Check valve spring pressure at the specified height.
Standard
Outer
Intake: 604.1 N (135.8 lbs.) at 37.6 mm (1.480 inch).
Exhaust: 640.4 N (144.0 lbs.) at 34.1 mm (1.343 inch).
Inner
Intake: 284.4 N (63.9 lbs.) at 32.6 mm (1.283 inch).
Exhaust: 328.5 N (73.9 lbs.) at 29.1 mm (1.146 inch).
Limit
Outer
Intake: 567.8 N (127.7 lbs.) at 37.6 mm (1.480 inch).
Exhaust: 620.8 N (139.6 lbs.) at 34.1 mm (1.343 inch).
Inner
Intake: 266.8 N (60.0 lbs.) at 32.6 mm (1.283 inch).
Exhaust: 318.7 N (71.7 lbs.) at 29.1 mm (1.146 inch).
If it exceeds the limit, replace spring.