Mitsubishi Montero (1991+). Manual - part 150

GEAR TOOTH CONTACT PATTERNS 



1991 Mitsubishi Montero

         GENERAL INFORMATION

         Gear Tooth Contact Patterns

         * PLEASE READ THIS FIRST *

         The following article is for GENERAL INFORMATION purposes

only. Information does not SPECIFICALLY apply to all years, makes and

models, but is to be used as a general reference guide.

         INSPECTION

         PRELIMINARY INSPECTION

         Wipe lubricant from internal parts. Rotate gears and inspect

for wear or damage. Mount dial indicator to housing, and check

backlash at several points around ring gear. Backlash must be within

specifications at all points. If no defects are found, check gear

tooth contact pattern.

         GEAR TOOTH CONTACT PATTERN

NOTE:    Drive pattern should be well centered on ring gear teeth.

         Coast pattern should be centered, but may be slightly toward

         toe of ring gear teeth.

         1) Paint ring gear teeth with marking compound. Wrap cloth or

rope around drive pinion flange to act as brake. Rotate ring gear

until clear tooth contact pattern is obtained.

         2) Contact pattern will indicate whether correct pinion

bearing mounting shim has been installed and if drive gear backlash

has been set properly. Backlash between drive gear and pinion must be

maintained within specified limits, until correct tooth pattern is

obtained.

Fig. 1:  Drive Axle Gear Tooth Patterns

         ADJUSTMENTS

         GEAR BACKLASH & PINION SHIM CHANGES

NOTE:    Backlash is adjusted by either moving shims from one side of

         differential case to the other or by turning adjusting nuts

         on which side bearing races ride. Changing of pinion shims

         alters the distance from face of pinion of centerline of

         ring gear.

         1) With no change in backlash, moving pinion further from

ring gear moves drive pattern toward heel and top of tooth, and moves

coast pattern toward toe and top of tooth.

         2) With no change in backlash, moving pinion closer to ring

gear moves drive pattern toward toe and bottom of tooth, and moves

coast pattern toward heel and bottom of tooth.

         3) With no change in pinion shim thickness, an increase in

backlash moves ring gear further from pinion. Drive pattern moves

toward heel and top of tooth, and coast pattern moves toward heel and

top of tooth.

         4) With no change in pinion shim thickness, decrease in

backlash moves ring gear closer to pinion gear. Drive pattern moves

toward toe and bottom of tooth, and coast pattern moves toward toe and

bottom of tooth.

GENERAL COOLING SYSTEM SERVICING 



1991 Mitsubishi Montero

         GENERAL INFORMATION

         General Cooling System Servicing

         * PLEASE READ THIS FIRST *

         The following article is for general information only.

Information may not apply to all years, makes and models. See specific

article in the ENGINE COOLING section.

         DESCRIPTION

         The basic liquid cooling system consists of a radiator, water

pump, thermostat, electric or belt-driven cooling fan, pressure cap,

heater, and various connecting hoses and cooling passages in the block

and cylinder head.

         MAINTENANCE

         DRAINING

         Remove radiator cap and open heater control valve to maximum

heat position. Open drain cocks or remove plugs in bottom of radiator

and engine block. In-line engines usually have one plug or drain cock,

while "V" type engines will have 2, one in each bank of cylinders.

         CLEANING

         A good cleaning compound removes most rust and scale. Follow

manufacturer’s instructions in the use of cleaner. If considerable

rust and scale has to be removed, cooling system should be flushed.

Clean radiator air passages with compressed air.

         FLUSHING

CAUTION: Some manufacturers use an aluminum and plastic radiator.

         Flushing solution must be compatible with aluminum.

         Back Flushing

         Back flushing is an effective means of removing cooling

system rust and scale. The radiator, engine and heater core should be

flushed separately.

         Radiator

         To flush radiator, connect flushing gun to water outlet of

radiator and disconnect water inlet hose. To prevent flooding engine,

use a hose connected to radiator inlet. Use air in short bursts to

prevent damage to radiator. Continue flushing until water runs clear.

         Engine

         To flush engine, remove thermostat and replace housing.

Connect flushing gun to water outlet of engine. Flush using short air

bursts until water runs clean.

         Heater Core

         Flush heater core as described for radiator. Ensure heater

control valve is set to maximum heat position before flushing heater.