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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
1980 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 45° 45° .067 .3498 .0003-.0018 .....
    (43)     (1.7) (8.97) (.008-.045)  
  Exhaust 1.496 45° 45° .078 .3490 .0014-.0026 .....
    (38)     (2.0) (8.95) (.036-.065)  
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 Interference .0007-.0012 1 .008.015 .002-.003
  (.024-.050)   (.019-.032)   (.20-.40) (.050-.082)
        2 .008-.015 .002-.003
          (.20-.40) (.050-.082)
        3 .015-.055 .0009-.005
          (.40-1.4) (.023-.127)
(1) Wear limit.003" (.080 mm).
(2) For KS piston rings. For Mahle piston rings, No. 1 clearance is.002-.004" (.050-.102 mm), No. 2 clearance is.002-.003" (.050-.076 mm), and No. 3 clearance is.0005-.005" (.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 .0008-.0038 No. 3 .0039-.0157 2.046-2.047 .001-.004 .004-.016
  (69.97-69.99) (.020-.098)   (.100-.400) (51.97-51.99) (.034-.092) (.10-.40)
VALVE TIMING

Engine INTAKE EXHAUST
Open (ATDC) Close (ABDC) Open (BBDC) Close (BTDC)
4474 cc 8° 55° 38° 2°
TIGHTENING SPECIFICATIONS

Application Ft.Lbs. (mkg)
Cylinder Head Bolts  
  Step 1 14 (2.0)
  Step 2 36 (5.0)
  Step 3(1) 61 (8.5)
Main Bearing Carrier  
  10 mm Bolt  
    Step 1 14 (2.0)
    Step 2 29-33 (4.0-4.5)
  12 mm Bolt  
    Step 1 14 (2.0)
    Step 2 29 (4.0)
    Step 3 43-46 (5.9-6.3)
Connecting Rod Nuts 42-46 (5.8-6.3)
Camshaft Housing 33 (4.5)
Flywheel 69-73 (9.5-10.0)
Front Pulley 181-188 (25.0-26.0)
Camshaft Pulley 29-33 (4.0-4.5)
Oil Pump  
  Step 1 11 (1.5)
  Step 2 14-16 (2.0-2.2)
Spark Plugs 18-25 (2.5-3.5)
(1) Allow to stand for 30 min. after setting Step 3 torque, then loosen 1/4 turn each. Retighten to 61 ft.lbs. (8.5 mkg).
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