Technical data

7
Specifications
Cylinder block
Pistons
Type ....................................................................... ”Swirl lip” combustion chamber, controlled expansion,
insert for top ring groove, center displaced piston pin
Diameter at piston bolt hole ................................... 28.004-28.010 mm
Distance between height classes
Production class 1 to 6 ..................................... 0.05 mm
Service classes 3 and 6 ................................... 0.15 mm
Piston height over cylinder block surface ............. 0.46-0.65 mm
Height of groove for the upper ring
MD22L, MD22, TMD22 ..................................... 2.10-2.12 mm
TMD22P, TAMD22 ............................................ 3.5 mm
Height of groove for the 2
nd
ring
MD22L, MD22, TMD22 ..................................... 1.81-1.83 mm
TMD22P, TAMD22 ............................................ 2.06-2.08 mm
Height of groove for the 3
rd
ring ............................. 3.03-3.05 mm
Oversized piston .................................................... 0.50 mm at the diameter
Piston rings
Upper compression ring
MD22L, MD22, TMD22 ..................................... Thin shaped (barrel face),molybdenum insert,
internal face on top surface.
TMD22P, TAMD22 ............................................ Keystone ring
2
nd
compression ring .............................................. Conical surface, alloy cast iron
Oil scraper ring ...................................................... Spring-loaded, chromed surface
Height,
upper ring .......................................................... 1.978-1.990 mm
2
nd
ring............................................................... 1.73-1.74 mm
3
rd
ring ............................................................... 2.98-2.99 mm
Play in groove
upper ring .......................................................... 0.11-0.14 mm
2
nd
ring............................................................... 0.07-0.10 mm
3
rd
ring ............................................................... 0.04-0.07 mm
Ring gap
upper ring MD22L, MD22, TMD22 .................... 0.28-0.56 mm
upper ring TMD22P, TAMD22........................... 0.30-0.50 mm
2
nd
ring MD22L, MD22, TMD22 ........................ 0.28-0.56 mm
2
nd
ring TMD22P, TAMD22 ............................... 0.60-0.80 mm
3
rd
ring ............................................................... 0.23-0.56 mm
Piston bolts
Type ....................................................................... Moving
Outer diameter ....................................................... 27.995-28.000 mm
Play in piston bolt position, piston ......................... 0.004-0.015 mm