Oil Pressure; Pressure-Testing Cooling System; Valve Tappets, Valve Timing - Volvo DH10A 245 Service Manual

6398
6666
6662
38
6441
8068

Oil pressure

Special tools:
(999) 6398 Pressure gauge
6666 Nipple
At normal engine operating speed and temperature, the
oil pressure should be 300–50 kPa (3.0–5.0 kp/cm
If the oil pressure is below 60 kPa (0.6 kp/cm
warm engine and at low idle, this does not mean any-
thing is amiss as long as the pressure does not go below
approx. 300 kPa (3.0 kp/cm
If the oil pressure is low and a faulty reducer valve is
suspected, it should be removed and checked.

Pressure-testing cooling system

Special tools:
(999) 6441 Test cap with nipple
6662 Pressure tester
Check the coolant hoses for ageing (hardness),
cracks, separation, blisters, scuffing, etc. Replace a
damaged or badly worn hose before checking for
leakage. If necessary, top-up with coolant before
pressure testing.
Connect the pressure tester together with test cap and
fit the cap temporarily in position. Pressure test at 70
2
kPa (0.7 kp/cm ).
When the pressure stabilizes, check all the components
in the system – radiator, connections, hoses, coolant
pump, heating system, etc. If the pressure gauge shows
a drop in pressure, this indicates leakage, which must
be remedied!

Valve tappets, valve timing

Special tool:
(999) 8068 Crank tool
1. Fit crank tool 8068.
2. Let an assistant rotate the flywheel.
3. Set valve clearance to 0 mm before measuring + a
half turn more on the adjuster screw. Pre-set the
dial indicator to 15 mm.
2
2
) with a
2
) at operating speed.
).