ReferenceModification no.
- 0 -
Page
107
Date
1997 02 01
Main
914 F
01477
12.3.18)Renewal of spark plugs
Renew spark plugs according to Maintenance check list. Use only original
spark plugs of 12 mm ND X27EPR-U9.
■ ATTENTION: Tighten spark plugs to 20 Nm (180 in.lb) on the cold engine
only.
Renew always both plugs of a cylinder and do not interchange between
cylinders.
Remove spark plugs and put them aside coordinated to cylinder and position.
Plug face appearance reveals the following about operating condition of
engine:
➪ light coloured to brown
plug and calibration are correct
➪ velvet black
Indicates the following:
— mixture too rich
— insufficient air intake (clogged air filter)
— engine operating temperature too low
➪ oily, glossy coating
indicates the following:
— misfiring
— too much oil in combustion chamber
— worn cylinder and piston rings
➪ whitish with melt droplets
Indicates the following:
— mixture too lean
— leaking valves
— air box temperature too high
— fuel control incorrect adjusted or defective
— faulty control valve
— poor fuel quality
12.3.19)Checking of spark plug connector for tight fit
Check spark plug connector for tight fit on spark plug every 200 hours of
operation. Min. pull-off force to be 30 N (7 lbf.). Renew loosely fitting spark
plug connectors.
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