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Engine Specifications

GENERAL SPECIFICATIONS

Year Displ. Carburetor HP at RPM Torque (Ft. Lbs. at RPM) Compr. Ratio Bore Stroke
cu. ins. cc in. mm in. mm
1981 273 4474 Fuel Inj. 220@5500 265@4000 9:1 3.74 95.0 3.11 78.9
VALVES

Engine & Valve Head Diam. In. (mm) Face Angle Seat Angle Seat Width In. (mm) Stem Diameter In. (mm) Stem Clearance In. (mm) Valve Lift In. (mm)
4474 cc              
  Intake 1.692 (43) 45° 45° .067 (1.7) .3498 (8.97) .0010-.0020 (.030-.057) .....
Exhaust 1.496 (38) 45° 45° .078 (2.0) .3490 (8.95) .0200-.0028 (.050-.077) .....
1 - Limit.020" (.5 mm).
PISTONS, PINS, RINGS

Engine PISTONS PINS RINGS
Clearance In. (mm)(1) Piston Fit In. (mm) Rod Fit In. (mm) Rings End Gap In. (mm) Side Clearance in. (mm)(2)
4474 cc .001-.002 (.024-.050) Interference .0007-.0012 (.019-.032) (1) .008-.015 (.20-.40) .002-.003 (.050-.082)
2 .008-.015 (.20-.40) .002-.003 (.050-.082)
3 .015-.055 (.40-1.4) .0009-.0050 (.023-.137)
(1) Wear limit.003" (.080 mm).
(2) For KS piston rings. For Mahle piston rings, No. 1 clearance is.002-.004" (.060-.102 mm), No. 2 clearance is.0015-.0026" (.040-.072 mm), and No. 3 clearance is.0005-.0049" (.013-.127 mm). Piston manufacturer must match ring manufacturer.
CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

Engine MAIN BEARINGS CONNECTING ROD BEARINGS
Journal Diam. In. (mm) Clearance In. (mm) Thrust Bearing Crankshaft End Play In. (mm) Journal Diam. In. (mm) Clearance In. (mm) Side Play In. (mm)
4474 cc 2.754-2.755 (69.97-69.99) .0008-.0038 (.020-.098) No. 3 .0039-.0157 (.100-.400) 2.046-2.047 (51.97-51.99) .001-.004 (.034-.092) .004-.016 (.10-.40)
VALVE TIMING

Engine INTAKE EXHAUST
Open (ATDC) Close (ABDC) Open (BBDC) Close (BTDC)
4474 cc 12° 48° 32°
TIGHTENING SPECIFICATIONS

Application Ft. Lbs. (N.m)
Cylinder Head Bolts
    Step 1 14 (20)
Step 2 36 (50)
Step 3(1) 61 (85)
Main Bearing Carrier
  10 mm Bolt
    Step 1 14 (20)
Step 2 29-33 (40-45)
  12 mm Bolt
    Step 1 14 (20)
Step 2 29 (40)
Step 3 44-47 (60-65)
Connecting Rod Nuts 42-46 (58-63)
Camshaft Housing 33 (45)
Flywheel 69-73 (95-100)
Front Pulley 181-188 (250-260)
Camshaft Pulley 33 (45)
Oil Pump
    Step 1 11 (15)
Step 2 14-16 (20-22)
Spark Plugs 18-22 (25-30)
Oil Drain Plug 44 (60)
(1) Allow to stand for 30 minutes after setting Step 3 torque, then loosen 1/4 turn each. Retighten to 61 ft. lbs. (85 N.m).