(if applicable) term(s) (or Eng- lish Equivalent)
N
National Institute of Occupational NIOSH Safety & Health (US)
Newton N SI unit of force. 1 N = 0.2248 pounds force
Newton meters Nm
SI unit of torque. Must not be confused with nm (nanometer)
compounds of nitrogen and oxygen formed
at high temperatures. Major source of
exhaust
-gas air-pollution
RAM which retains memory even if power
N
Ox
NVRAM
Memory supply is interrupted
normally aspirated fueling system using intake air at
atmospheric pressure; not supercharged or
turbocharged
Normally Closed NC
Normally Open NO
North American Specification NAS vehicles for sale
in the USA and Canadian
markets
0
I number I No.
octane number
I
I open circuit
I oriainal eauiDment manufacturer
I outside diameter OSHA
OBD
OEM
0. dia
OHC
oc
N Ox
02s
measure ofthe anti-knockproperties ofafuel
instrument which records the total mileage
covered by a vehicle
a system that monitors some or all computer
input and output control signals.
Signal(s) outside the pre-determined limits imply a
fault in the svstem or a related svstem
a circuit which does not provide a complete
path for flow of current
engine configuration with single camshaft
positioned above the valves
catalytic converter system that reduces
levels
of HC and CO
a sensor which detects oxygen content in the
exhaust gases mileometer
oilwav
EGO,
02 EOS,
EGS, OS, EGOS,
Lambda Sensor
Issue 1 August 1994 20 X300 VSM
in these areas indicates the onset of wear.
Hold the inner race between the fingers and thumb of one hand, spin the outer race and checkthat
it revolves absolutely
smoothly. Rotate the outer ring with a reciprocating motion, while holding the inner ring; feel for any obstruction to
rotation and reject the bearing if the action is not perfectly smooth. Lubricate the bearing generously with lubricant
appropriate to the installation. Inspect the shaft and bearing housing for discolouration or other marking which may
suggest that movement has taken place between the bearing and bearing seat.
If markings are found, use Loctite when
installing the replacement bearing.
Ensure that the shaft and housing
are clean and free from
burrs before fitting the bearing. If one bearing of a pair
shows an imperfection, it is generally advisable to renew
both bearings: an exception could be made only if the bear- ings had covered a low mileage and it could be established
that damage was confined to the one bearing.
- In the case of bearings which are lubricated with grease (e.g.
hub bearings) the space between the bearings should be
smeared with a recommended grade of grease, and the
bearings and seal should be re
-packed. When fitting the
bearing to the shaft, apply force only to the inner ring of
bearing (Fig.
1A). When fitting the bearing to the housing,
apply force only to outer ring (Fig. 1B).
Always mark components of separable bearings (e.g taper
roller bearings) when dismantling, to ensure correct
reassembly. Never
fit a new inner roller assembly to a used
outer track.
A3.2.6 Oil Seals
Always fit new oil seals when rebuilding an assembly.
Examine the seal before fitting to ensure that it is clean and
undamaged. Smear sealing lips with clean grease, pack
dust excluder seals with grease and pack grease into the
cavity between the sealing lips of duplex seals. Ensure that
the seal spring,
if provided, is correctly fitted.
Place the lip
of the seal towards the fluid to be sealed and
slide it into position on the shaft, using a fitting sleeve (Fig. 2) when possible to protect the sealing lip from damage by
threads, splines or sharp edges on the end of the shaft. If a fitting sleeve is not available, use plastic tube or adhesive
tape to prevent damage to the sealing lip.
Grease the outside diameter of the seal, place it square to the
housing recess and press it into position, using great care
and, where available, a seal installer (Fig. 3) to ensure that
the seal does not tilt. In some cases it may be preferable to
fit the seal to the housing before fitting it to the shaft. Never
let the weight of an unsupported shaft rest in a seal. If the
correct service tool is not available, use a piece of tube which
is approximately 0,4 mm (0.015 in) smaller than the outside
diameter of the seal. Use a press to install the seal or use a
hammer VERY GENTLY on the tubular drift if a press is un-
suitable or not available.
,107 001 A B
I Fig. 1
A3.2.5 Ball And Roller Bearings
CAUTION: Never replace a ball or roller bearing without first ensuring that it is in as-new condition.
Remove
all traces of lubricant from the bearing by washing it in petrol or a suitable degreaser. Maintain absolute
cleanliness throughout the operations. Inspect visually for markings of any form on rolling elements, bearing tracks,
outer surface of outer rings or inner surface of inner rings. Reject any bearings found to be marked, since any markings
Fig.
2
307 002
i
Fig. 3
Issue 1 August 1994 3 X300 VSM
