The bore refers to diameter of cylinder sleeve, which is specified by a 2-3 digit integer with the
decimal part rounded and millimeter as unit.
Characteristic code: indicates the most basic characteristics of an engine and is specified by 1 digit
upper case English letter.
Specification code: specified by 1 digit upper case English letter, which is used as an additional
distinguish code when distinguish is required in case structure, principal parameter or oil supply
mode etc. has changed (for example, the stroke of engine has changed or the engine is a dual fuel
engine) with number of cylinders, bore and characteristic code of the engine unchanged. For
changes of peripheral parts of the engine (such as intake and exhaust manifolds), the engine model
will keep unchanged, and engine assembly number will be changed for distinguish. Among the
engines of the same series, the specification code will be used with “B” as the first (among which,
do not use such letters as “I”, “O”, “Q”, “X” and “Z”). The default specification code for the first
fundamental structure is “A”, which is omitted. The specification also can quote the characteristic
code to express specific characteristics.
Position of engine model
The engine model should be printed at an obvious part on engine cylinder block and please
see provisions in Assembly and Regulation Instruction of Engine for the specific position.
Leaving factory number of engine is composed of characteristic code of engine, EFI manufacturer
code, character code of the year of production, character code of the month of production,
sequence number of this engine among the engines of this model manufactured in that month and
start stop sign “*”. Complete form of leaving factory number of a engine is as follows:
* □ □ □ ○○○○○ *
Character code of the month
Among which, ○ indicates an Arabic numeral, □ indicates a letter and indicates an Arabic
numeral or a letter.
The characteristic code of engine should conform to above provision.
EFI system manufacturers: C-Motorola; D-Marelli; E-Delphi; F-UAES; G-Siemens; H-Troitec;
B-Bosch
EFI system manufacturer code
SN among the volume of
production of the current month
Character code of the year
Characteristic code
