Volvo Penta D2-55, Руководство по ремонту

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49
Group 21 Short block
Adjusting valves
NOTE! The clearances shall never be checked while
the engine is running, but on a stationary cold engine.
Valve clearances: Inlet and exhaust: 0.2 mm.
1. Remove the valve cover.
2. Turn the engine in normal direction of rotation until
no.1 piston is at TDC after the compression
stroke. The valves on cylinder 4 overlap.
3. Check and adjust the valve clearances for cyl. no.
1. Turn the engine in normal direction of rotation a
half turn and check the clearances for cyl. no. 3,
the valves on cylinder 2 overlap.
Check the clearances for the remaining cylinders
in firing order.
4. Replace seal. Clean the valve cover and install it.
Test run the engine and check that no oil leakage
occurs.
Replace ring gear on flywheel
1. Mark the flywheel position on the crankshaft (sim-
plifies installation). Remove the flywheel.
2. Drill a hole or two in a tooth root on the ring gear.
Crack the ring gear with a chisel at the drilled
holes and remove it.
3. Clean the ring gear contact surface on the fly-
wheel with a wire brush.
4. Heat up the new ring gear in an oven (120-150
o
C)
so that the ring gear is heated evenly.
5. Place the heated ring gear on the flywheel and
drive into place with a hammer and soft mandrel.
The ring gear should then cool naturally.
6. Clean the contact surfaces on the flywheel and
crankshaft. Check the rear crankshaft seal.
Change as necessary.
7. Install the flywheel according to previously made
marks.
Tightening torque, please refer to the “Technical
Data” chapter.
Firing order 1 3 4 2
Corresponding cylinder 4 2 1 3
who’s valves “overlap”
Inlet Exhaust