Basic Specifications Of Gas Engines; General Description Of The Construction Of The Engine; Crankcase; Sleeves - Kohler SFGLD480 Operation & Maintenance Manual

1. BASIC SPECIFICATIONS OF GAS ENGINES

The technical characteristics of the engines are shown in:
- IC-G-D-00-034 FG engines
- IC-G-D-00-035 FGLD, SFGLD, SFGM in line engines
- IC-G-D-00-036 FGLD, SFGLD, SFGM V engines
- IC-G-D-00-131 SFGRD in line engines
- IC-G-D-00-132 SFGRD V engines
- IC-G-D-00-149 HGM engines
These are four-stroke engines with spark ignition (Otto Cycle). The SFGM and HGM series feature Miller cycle.
They belong to different categories, as follows:
- FG engines, naturally aspirated with stoichiometric combustion (lambda=1).
- SFGRD engines supercharged by turbocharger and aftercooler with rich burn technology (Lambda<1)
and low-pressure air/gas mixture.
FGLD/SFGLD/SFGM engines supercharged by turbocharger and aftercooler with lean burn technology
-
(Lambda=1.3 / 1.6) and low-pressure air/gas mixture.
- HGM engines supercharged by high-compression ratio turbocharger and intercooler, with lean burn
technology (Lambda=1.4 / 1.7) and low-pressure air/gas mixture.
Kohler engines can operate on gases with different calorific capacities (LHV), see Product Information
IC-G-D-30-001e.

2. GENERAL DESCRIPTION OF THE CONSTRUCTION OF THE ENGINE

2.1. CRANKCASE

The crankcase is manufactured from grey cast iron with a stabilising heat treatment to eliminate residual
stresses. It has a high mechanical sturdiness as befits its original design oriented towards diesel applications.
The crankcase is constructed with different side openings, which allows a high degree of accessibility to internal
engine components such as connecting rods, camshafts, etc., to facilitate engine maintenance.

2.2. SLEEVES

Sleeves are from centrifuged grey cast iron and are installed on the engine block, due to which they are
interchangeable, allowing easy maintenance.
2.3. CRANKSHAFT
The crankshaft is made from die-pressed alloy steel, which is given a general heat treatment (quenching and
tempering).
PRODUCT INFORMATION
IC-G-D-00-040e
GAS ENGINES GENERAL DESCRIPTION OF CONSTRUCTION
INDEX
F
2.1.11
DATE
Dep. 2
May 2016
O&M_2.002211.810_A_10_2016
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