General Engine Operation - Suzuki K6A-YH6 Technical/Repair Manual

THEORY OF OPERATION

4.1 General Engine Operation

See Figure 4-1.
4
The K6A engine is an in-line, 3-cylinder, twin overhead
cam, 4-valve per cylinder, naturally aspirated, liquid
cooled, gasoline engine.
The compact K6A engine is constructed primarily of
durable, lightweight, heat-dissipating materials.
The cylinder head is a twin cam 4-valve type and made of
aluminum alloy that is light in weight and excellent in heat
dissipation. Valves are direct driven from camshafts by
way of shim-adjustable tappets placed on top of valves.
The combustion chamber is a pent-roof type with the
spark plug arranged in the center for improved
combustion. Spark plugs are fired by direct mounted
individual coils for each plug.
The camshafts are made of lightweight hollow cast iron.
Camshaft drive is done with a chain drive that is
automatically adjusted by a chain tensioner. The chain
tensioner uses lubrication system pressure and spring
pressure to automatically compensate for chain wear.
4-2
Figure 4-1
The cylinder head gasket is of 2-layer laminated stainless
steel which is excellent in durability and reliability. Use of
advanced coatings further enhance the fluid sealing
capabilities of the gasket.
The cylinder block is of a lightweight aluminum two-piece
design, consisting of upper and lower castings. The lower
casting is a ladder design that incorporates the main
journal caps for added rigidity. Semi-wet pressed-in
cylinder sleeves are contained in the upper block casting.
The crankshaft is constructed of cast iron and utilizes
four main journals and three rod journals. Counter-
balancing is achieved by weights on two of the journals.
Rod and main journal bearings are of a two-piece design
with the third main journal incorporating a thrust bearing.
Connecting rods are of a two-piece design made of
carbon steel. The rod cap is retained, using special
reamer type rod bolts and nuts.
TN0746