Pajero II Workshop Manual 1991 · Отопление, кондиционирование и вентиляция · страница 88 из 118 · Открыть оригинал PDF ↗

Текст распознан со скана. Числа и обозначения можно сверить с оригиналом ниже.

COMPRESSOR NOISE

ESSFXAA

Wheninvestigatinganair conditioningrelated noise,you
must firstknowtheconditionswhenthenoiseoccurs
Theseconditionsareweather,vehiclespeed,ingearor
neutral,engine temperatureor any other special conditions_
Noisesthat develop during air conditioning operationcan
often be misleading:For example: what sounds likea failed
front bearingor connectingrod,maybecaused by loose
bolts,nutsmountingbrackets, Ora loose clutch assembly.
Verify accessorydrivebelttension(power steering;alter-
nator or air pump). Improper accessory drive belt tension can
cause
misleading noise when the compressor is engaged
and littleOrno noisewhen thecompressor is disengaged.
Drive belts are speed sensitive.That is, at different engine
speeds, and depending upon belt tensionbelts can develop
unusualnoisesthatareoftenmistakenformechanical
problems within the compressor:

Adjustment Procedures

(1) Selectquiet area for testing:Duplicate conditionsas
much as possible. Switch compressor o and off several
times to clearly identify compressor noise

To duplicate high ambient conditions (high headpres -
sure) . restrict air-flow through condenserInstall mani-
fold gauge set to make sure discharge pressure does
not exceed 2,070 kPa (21.1 kg/ cm?,300 psi): R-12
2,550 kPa (26 kg / cm?, 370 psi): R-134a.

(2) Tighten all compressor mounting bolts, clutch mounting
bolt,and compressor drivebelt.Check to assure clutch
coil is tight (no rotation or wobble).

(3) Check refrigerant hoses for rubbing or interference that
can cause unusual noises

(4) Check refrigerant charge (SeeCharging the System

(5)Recheck compressor noise as in Step

(6)noisestillexists,loosencompressormountingbolts
and retorqueRepeat Step
If noise continues, replace compressor ad repeat Step

Оригинальная страница руководства