Bearings; Cylinder Heads; Connecting Rods; Pistons - Kohler SFGLD480 Operation & Maintenance Manual

It is of the suspended block type for which reason it is secured with nodular cast iron caps and alloy steel studs,
making the engine assembly very sturdy.
The crankshaft bearings, crankpins and radii (bends) are induction-tempered to ensure surface hardness and
better performance and longer life for the crankshaft.
The crankshaft is dynamically balanced by built-in counterweights and its ends are supported by an inertia
flywheel to ensure regular operation and a torsion vibration damper.

2.4. BEARINGS

The semi-bearings used in the connecting rod head and crankshaft are manufactured from steel and the roller
track is made from aluminium tin alloy.

2.5. CYLINDER HEADS

The cylinder heads are made from grey cast iron and are individual for each cylinder, allowing high engine
maintenance.
Apart from housing the intake and exhaust piping, they have two water chambers that are part of the engine
cooling system.
Each cylinder head comes complete with a four-valve system per cylinder (2 intake and 2 exhaust) which are
formed by valve seats, valves and valve guides, as well as springs, valve plates and half-cones. All the
components fitted into the cylinder heads allow easy replacement and maintenance.
The cylinder head also houses the spark plug sleeve that accommodates an easy-to-fit/remove firing spark plug.

2.6. CONNECTING RODS

The connecting rods are die-pressed in alloy steel and are then quenched and tempered to improve their
mechanical characteristics. They are cut obliquely and with a saw-tooth joint which guarantees an adequate
joint after assembly of crank head and cap.

2.7. PISTONS

The pistons are made from aluminium alloy. The volume for the combustion is formed by the volume between
the piston TDC and the cylinder head. The pistons include a chamber shaped on piston top
The piston is jet cooled with refrigeration oil from a specific regulated pressure gallery either at the base of the
piston or through a gallery inside the piston itself.
2.8. PISTON RINGS
A piston ring set consists of three rings:
- Compression ring, i.e. a chrome-plated rectangular ring on a piston ring carrier for engines with 152mm
cylinder dia. and a ceramic trapezoidal ring for engines with 160mm dia. pistons
- Scraper ring, and
- Oil control ring
PRODUCT INFORMATION
IC-G-D-00-040e
GAS ENGINES GENERAL DESCRIPTION OF CONSTRUCTION
INDEX
F
2.1.12
DATE
Dep. 2
May 2016
O&M_2.002211.810_A_10_2016
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