Linde 350 Series Service Training page 216

Section 9
Page 8
Tighten the cylinder head in four stages and in the sequence
shown:
1. Pretighten with a torque wrench:
Stage I = 40 Nm
Stage II = 60 Nm
2. Tighten further with a normal spanner:
Stage III = 1/4 turn (90°)
Stage IV = 1/4 turn (90°)
NOTE: The cylinder head bolts do not need to be
retightened after repairs.
CHECKING COMPRESSION PRESSURE
Miniumum engine oil temperature 30 °C
- Disconnect the plug on the Hall generator (distributor). On
engines without a Hall generator disconnect the high voltage
lead from the ignition coil at the distributor and connect to
ground (-).
- Fully open the throttle valve.
- Check the compression pressure with a compression tester.
- Operate the starter until no further pressure increase is
indicated on the compression tester.
- Compression pressure readings:
new: 9 ... 12 bar overpressure
Wear limit: 7.5 bar overpressure
- Permissible pressure difference between cylinders: 3 bar.
CHECKING HYDRAULIC TAPPETS
NOTE: Replace tappets only as a kit (can not be adjusted
or repaired).
Irregular valve noises when starting the engine
are normal.
- Start the engine and increase engine speed to approx. 2500
rpm for 2 minutes.
If the hydraulic tappets are still noisy, locate the defective
tappet as follows:
Service Training