WÄRTSILÄ VASA 6L32, Instruction Manual

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e) Injection valve faulty; nozzle holes clogged 16.
f) Piston rings ruined; too low compression pressure 11.3.3
g) 8...18-cylinder engines. It may be troublesome to make these fire on all cylinders when
idling, due to the small quantity of fuel required.
In normal operation this is acceptable.
In special cases, in engines which have to idle continuously for longer periods (several hours),
for some reason, it is advisable to adjust the rack positions carefully (reduce rack position
somewhat on those cylinders having the highest exhaust gas temperatures, increase
somewhat on those cylinders not firing). This adjustment should be done in small steps and
the difference between rack positions of various cylinders should not exceed 0.5 mm.
4. Engine speed not stable
a) Governor adjustment faulty (normally too low compensation) 22.
b) See point 2f
c) Fuel feed pressure too low 01.2
d) Water in preheated fuel (vapour lock in injection pumps)
e) Loading automation (e.g. controllable pitch propeller) outside engine faulty 23.
5.
Knocks or detonations occur in engine
(if reason cannot be found immediately, stop the engine!)
a) Big end bearing clearance too large (loose screws!) 06.2 pos. 11,
07.3,
11.3.4
b) Valve springs or injection pump tappet spring broken 12., 16.
c) Inlet or exhaust valve jamming when open
d) Too large valve clearances 06.1, 12.2.4
e) One or more cylinders badly overloaded (3b, c)
f) Injection pump or valve tappet guide block loose 16.3,
14.1.3.3,
07.1
g) Initial phase of piston seizure
h) Insufficient preheating of engine in combination with fuel of low ignition quality
i) Fuel injection timing wrong. See point 9c.
6. Dark exhaust gases
a) Late injection (wrongly set camshaft drive) 06.1, 16.2.3,
13.2.2
b) See points 3b, c, d, e
c) Insufficient charge air pressure:
- air intake clogged
- turbocharger compressor dirty
- charge air cooler clogged on air side
- turbocharger turbine badly fouled
Note! Engines starting on heavy fuel may smoke if left idling.
Test Records
15.2
15.2, 04.4
04.5
7. Engine exhaust gases blue-whitish or gray-whitish
a) Excessive lubricating oil consumption due to: gas blow-by past piston rings; worn or broken oil
scraper rings or worn cylinder liners; sticking compression rings; compression rings turned upside-
down; ring scuffing (burning marks on sliding surfaces)
03.4.5, 11.3.3
b) Blue-whitish exhaust gases may occasionally occur when engine has been idling for a
lengthy time or at low ambient temperature, or for a short time after starting
c) Gray-whitish exhaust gases due to water leakage from exhaust boiler, turbocharger/
water in fuel
8. Exhaust gas temperature of all cylinders abnormally high
a) Engine badly overloaded (check injection pump rack positions) Test Records
b) See point 6c
08 Operating Troubles, Emergency Operation 32-200402-01
08 - 2 WÄRTSILÄ 32