ENGINE IDENTIFICATION
This handbook is applicable to the following marine engine type designations:
4.108
(M)
4.154
(M)
4.236
(M)
6.354
(M)
T6.354
(M)
T6.354
(MGT)
HT6.354
(M)
V8.510
(M)
TV8.510
(M)
The first numeral (e.g., 4) in the engine designation denotes the number of cylinders, while the second group of numerals
(e.g., 108) denotes the cubic inch displacement (C.I.D.) of the engine. The prefix letters (e.g.,T) denote the following:
T - Turbocharged Engine
H - Horizontally Inclined Engine
V - Two banks of cylinders in "V" formation.
*Special version of the T6.354 Marine engine.
The letter "M" in parenthesis indicates the applicable engine was manufactured specifically for marine applications.
Apart from physical differences, each engine can be identified by the engine identification code stamped into the cylinder
block. The code is comprised of a combination of numerals and letters (Alphanumeric). At the present time, two
identification formats are in existence. The earlier format (e.g., 354U251T) represents the following data:
In addition to the above, contra-rotating (clockwise) engines are further identified by the letter "X" stamped immediately
after the manufacturing location code letter (e.g., 354UX252T).
Additional suffix letters may also be included in the code for certain engines. For example:
H - Horizontally Inclined Engine
L - Lip Type Rear Main Bearing Seal
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