ENGINE UNIT


  1. CONSTRUCTION


    1. A crankshaft made of forged steel, which excels in rigidity and wear resistance, is used.

    2. The crankshaft has 5 main bearing journals and 8 balance weights.

    3. A balance shaft drive gear is provided on the crankshaft.

      A01O6YZC01
      *1 No. 1 Main Bearing Journal *2 No. 2 Main Bearing Journal
      *3 No. 3 Main Bearing Journal *4 No. 4 Main Bearing Journal
      *5 No. 5 Main Bearing Journal *6 Balance Shaft Drive Gear
      *7 Balance Weight - -

    4. The oil groove on the crankshaft bearing is made eccentric to reduce the amount of oil leakage from the bearing. This enables the capacity of the oil pump to be reduced in order to reduce parasitic losses.

    5. The lining surface of some of the crankshaft bearings is covered in a resin coating, ensuring reliability and durability. Microgroove processing has been applied to the lining surface of the other crankshaft bearings, ensuring durability and reliability, and improving initial running-in.

      Crankshaft Bearing No. 1 Journal No. 2 Journal No. 3 Journal No. 4 Journal No. 5 Journal
      Crankshaft Bearing (Cylinder Block Side) O - O - -
      No. 2 Crankshaft Bearing (Crankshaft Bearing Side) O - - - O

      Tech Tips

      O: Resin coating

      -: Micro-grooved

      A01O75EC01
      *A Micro-grooved Bearing *B Resin Coating Bearing
      *1 Upper Main Bearing (Crankshaft Bearing) *2 Lower Main Bearing (Crankshaft Bearing)
      *a Micro-grooved *b Oil Groove
      *c Center *d Edge
      *e Oil Groove Depth - -
      B004D18 Resin Coating - -