Systems and scheduled
maintenance
Solé, S.A. C-243 b, km 2 · 08760 Martorell (Barcelona) ·Tel. +34 93 775 14 00 · www.solediesel.com · [email protected]
23
Marine diesel engines. Operator’s manual
6.
Loosen the lock nut. Tighten or loosen the
adjusting screw, while measuring the
clearance, until the thickness gage moves
slightly stiff.
7.
After adjustment, tighten the lock nut firmly.
Then, check the clearance again.
8.
Turn the crankshaft 180° or 120° clockwise.
Adjust the valve clearances of other cylinders
while turning the engine.
9.
After the valve clearance on the valves for all cylinders has been adjusted, turn the crankshaft
two or three times and make sure the valve clearance is correct.
Valve clearance should be inspected and adjusted when the engine is cold.
Adjusting
1.
Loosen the lock nut of the adjusting screw. Adjust the
clearance by turning the screw in either direction to
the extent that the gauge is slightly gripped between
the rocker arm and valve cap.
2.
After adjusting the clearance, tighten the lock nut.
Inspect the clearance again and make sure that it is
correct.
Maintenance task. Compression pressure inspection
Start by:
1.
Make sure the engine oil level, air cleaner, starting
motor and battery are well-conditioned.
2.
Start the engine and allow it to warm up thoroughly,
until 50ºC or more coolant temperature.
Measure the compression pressure on all cylinders:
1.
Remove the injection nozzle from the cylinder head where the compression pressure is to be
measured.
2.
Attach the compression pressure gauge.
3.
Disconnect the stop solenoid connector (the fuel supply shut off) and crank the engine by
means of the starter and read the compression pressure gauge indication when the engine is
running at specified speed.
4.
If the compression pressure is lower than repair limit, check the engine parts affected.
-
It is not a good practice to measure the compression pressure on only few cylinders, and
presume the compression on the remaining cylinders.
-
Compression pressure varies with engine speed. Check engine speed when measuring the
compression pressure.
-
The compression pressure will be slightly higher in a new or overhauled engine due to new
piston rings, valve seats, etc.
Engine speed
Compression pressure
Repair limit
MINI-62
150 - 200 rpm
2,94 MPa (30 kgf/cm
2
)
2.55 MPa (26 kgf/cm
2
)
SM-103
300 rpm
2,9MPa (30 kgf/cm
2
)
2.6 MPa (27 kgf/cm
2
)
