Volkswagen Corrado (1993 year). Manual - part 148

 

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Volkswagen Corrado (1993 year). Manual - part 148

 

 

GEAR TOOTH CONTACT PATTERNS 

         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.

GEAR TOOTH CONTACT 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.

GEAR TOOTH CONTACT PATTERNS 

END OF ARTICLE

GENERAL COOLING SYSTEM SERVICING 

         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

 

 

 

 

 

 

 

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