Avtodizel ???-238??, Operating Instructions Manual, Page: 10 / 254

10
Power Unit Model
Key parameters and charac-
teristics
ЯМЗ
-238
БЕ ЯМЗ
-238
БЕ
2
ЯМЗ
-238
ДЕ ЯМЗ
-238
ДЕ
2
Air-Fuel Mixing Direct Injection
Combustion Chamber Single-cavity in Piston
Camshaft Gear driven, one for two banks of cylinders
Valves Timing Angles:
Inlet Valves:
Opening,
degrees before TDC
20 21,5 20 21,5
Closing,
degrees after BDC
40 31,5 40 31,5
Outlet Valves:
Opening,
degrees before TDC
66 63 66 63
Closing,
degrees after BDC
20 29,5 20 29,5
Number of valves per cylinder One inlet and one outlet
Thermal Clearances of Val-
ves (on cold engine), mm
0,25 - 0,30
Lubrication System
Mixed with oil cooling in water-cooled oil cooler. Crankshaft and Camshaft Bear-
ings, Push Rod spherical Ends, Valve Rocker Arm Bushes, Fuel Injection Pump
and Turbocharger are oiled under Pressure.
Other Frictional surfaces are oiled by splashing.
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