13
Values
Models of the engines
ЯМЗ-236M2
ЯМЗ-238M2
ЯМЗ-238AM2
ЯМЗ-238ВM
ЯМЗ-238ГM2 ЯМЗ-238KM2
Cylinder liners
"Wet" type
Cylinder heads
Two, each for every cylinder raw
Crankshaft
Forged, with counterweights, crank pin bearing surfaces are heat-treated with high frequency
current Number of crankshaft bearings
4
5
5
5
5
5
Base bush bearings with replaceable bushing Rod bush bearings
with replaceable bushing Pistons made of aluminum alloy
Piston pins
Floating type, axial movement is limited with closing rings I-section connecting rods
bronze bushing are pressed on the upper heads Flywheel has gear ring for engine
start-up with the starter
Camshaft
Common for both rows of cylinders, with gear drive
Gap between the valve and
rocker push rod, mm
0,25-0,30
0,25-0,30
0,25-0,30
0,25-0,30
0,25-0,30
0,25-0,30
Lubrication
system
Lubricating system
Hybrid. Pressure lubrication system lubricates all base and connecting rod bearings of crankshaft, camshaft
bearings, small end bushings, rocker bushings,
idler gear bushing of the oil pump, spherical seating of the rods,
push rods. High-pressure fuel pump and speed-regulating governor are equipped with circulation-system
lubrication from the engine lubrication system.
Gear mechanism, antifriction bearings and camshaft lobes are
centrifugal lubricated.
Oil pump
gear, double section
Pressure in the oil system, kPa
(kgf/cm2)
with nominal speed at
minimum idling RPM no less
400-730 (4-7,3)
100 (1,0)
400-730 (4-7,3)
100 (1,0)
400-730 (4-7,3)
100 (1,0)
400-730 (4-7,3)
100 (1,0)
400-730 (4-7,3)
100 (1,0)
400-730 (4-7,3)
100 (1,0)
Oil cooling system
Oil radiator installed outside the engine
Oil filters
Two full-flow oil filters with renewable filter element and fine filter - centrifugal, with jet drive. Coarse filter
installation instead of full-flow filter installation is allowed.
Summary of Contents for ???-236
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Page 193: ...N u M a r Method defect detection and Dimension and parameter mm...
Page 201: ...4 Thread stripping M16 1 5 6H no more than two threads Inspection To calibrate the thread...