TM 5-3895-373-34
2.17
DIESEL ENGINE REPAIR - Continued.
D.
REPAIR - Continued.
PISTONS
Type..................................................................................................................................................... Cavity-in-crown
Bore diameter for gudgeon pin................................................................1.5000 to 1.50002 in. (38,10 to 38,106 mm)
Compression ring groove width
Number 1.................................................................................................................................................Tapered
Number 2.................................................................................................0.0955 to 0.0963 in. (2,43 to 2,45 mm)
Scraper ring groove width
Number 3.................................................................................................0.1885 to 0.1893 in. (4,79 to 4,81 mm)
PISTON RINGS
Number 1 compression ...................................................................................................... Molybdenum-faced wedge
Number 2 compression ................................................................................................................ Chrome taper faced
Number 3 scraper......................................................................................Chrome faced, spring loaded conformable
Compression width
Number 1..................................................................................................................................... Wedge-shaped
Number 2...................................................................................................0.093 to 0.0935 in. (2,36 to 2,37 mm)
Number 3 scraper width ............................................................................0.186 to 0.1875 in. (4,72 to 4,76 mm)
Clearance in groove
Number 2...................................................................................................0.002 to 0.0033 in. (0,05 to 0,08 mm)
Number 3...................................................................................................0.001 to 0.0033 in. (0,03 to 0,08 mm)
Ring gap
Number 1.....................................................................................................0.010 to 0.024 in. (0,25 to 0,61 mm)
Number 2.....................................................................................................0.010 to 0.027 in. (0,25 to 0,66 mm)
Number 3.....................................................................................................0.010 to 0,031 in. (0,25 to 0,79 mm)
GUDGEON PIN
Type.......................................................................................................................................................... Fully floating
Outer diameter ........................................................................................1.4998 to 1.5000 in. (38,095 to 38,100 mm)
Length..............................................................................................................3.244 to 3.260 in. (82,40 to 82,80 mm)
Clearance fit for piston boss..........................................................................0.000 to 0.0004 in. (0,000 to 0,010 mm)
CONNECTING ROD ASSEMBLY SLEEVE BUSHING
Type............................................................................................................................Steel-backed, lead bronze lined
Outer diameter ........................................................................................1.65975 to 1.66125 in. (42,16 to 42,20 mm)
Inner diameter after reaming ...................................................................1.37575 to 1.37650 in. (34,94 to 34,96 mm)
Clearance between connecting rod assembly sleeve
bushing and gudgeon pin ..................................................................0.00075 to 0.0017 in. (0,019 to 0,043 mm)
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