Page 627 - Foton Workshop Manual - Auman EST-M

Engine section – Engine (Cummins ISF3.8) EG - 111

IN

l. Process the top of the sleeve, so that the projection above

the burning face is less than 0.050mm.
DI

EG
Less than

TR

m. After boring the cylinder, it is necessary to grind about AX
1.25 mm from the hole edge with a 15 degree chamfer by a
honing stone.
FR

ST

BR

n. After the borehole of the sleeve is repaired, a two-stage
BW
boring process is necessary for the cylinder to polish the

cylinder bore.
EL

o. The grinding rotation speed is 300~400r/min and the
reciprocating frequency is one time up and down in each
300 to 400RPM second. Use high quality boring and grinding oil or the
mixture of equivalent amount of SAE30W engine oil and
One time diesel oil as lubricant for boring and grinding

For the first stage of grinding or coarse grinding, the soft

Each second No. 80 carbide grindstone is used. The cylinder is ground to

final dimensions during this stage.

Boring and grinding dimension

Minimum: 102.000mm

Maximum: 102.040mm

For the second stage of grinding or right boring, the No. 285

carbide grindstone with a medium hardness is used. Bore
the cylinder in 15 to 20 times to produce the appropriate
overlapping curve.

EG-111