P rote cte d b y c o p yrig ht. C o p yin g fo r p riv a t e o r c o m m e r c i a l p u r p o s e s , i n p a r t o r i n wh o l e , i s n o t p e r m itte d u n le s s a uth o ris e d b y V olk s w a g e n A G . V olks w a g e n A G d o e s n ot g u ara nte e o r a c c e p t a n y lia b ilit y w it h r e s p e c t t o t h e c o r r e c t n e s s o f i n f o r m a ti o n in t h is d o c u m e n t. C o p yrig ht b y V olk s w a g e n A G . Repair Manual Touareg 2003 ➤ Suspension, Wheels, Steering Engine ID CAT A BHK BHL BAA BMX BAR AXQ BHX BWF BKW BLE Edition 09.2012 Service Service Department. Technical Information
P rote cte d b y c o p yrig ht. C o p yin g fo r p riv a t e o r c o m m e r c i a l p u r p o s e s , i n p a r t o r i n wh o l e , i s n o t p e r m itte d u n le s s a uth o ris e d b y V olk s w a g e n A G . V olks w a g e n A G d o e s n ot g u ara nte e o r a c c e p t a n y lia b ilit y w it h r e s p e c t t o t h e c o r r e c t n e s s o f i n f o r m a ti o n in t h is d o c u m e n t. C o p yrig ht b y V olk s w a g e n A G . 1.4 Steering System, Checking for Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247 2 Description and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 2.1 Steering Column Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 2.2 Power Steering Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 2.3 Power Steering Gear Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 2.4 Power Steering Pump Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 2.5 Power Steering Pump Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 2.6 Power Steering Pump Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254 2.7 Power Steering Pump Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256 2.8 Power Steering Pump Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258 3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 3.1 Fastener Tightening Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 4 Diagnosis and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 4.1 Power Steering Pump, Checking Delivery Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 4.2 Power Steering Pump, Checking Delivery Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263 4.3 Power Steering Pump Delivery Pressure, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264 4.4 Power Steering Pump, Checking Delivery Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267 4.5 Power Steering Pump, Checking Delivery Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 5 Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272 5.1 Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272 5.2 Power Steering Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 5.3 Protective Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 5.4 Power Steering Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 5.5 Power Steering Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 5.6 Power Steering Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 5.7 Power Steering Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285 5.8 Power Steering Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 5.9 Steering Column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289 5.10 Tie Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292 6 Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294 7 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299 Touareg 2003 ➤ Suspension, Wheels, Steering - Edition 09.2012 iv Contents
P rote cte d b y c o p yrig ht. C o p yin g fo r p riv a t e o r c o m m e r c i a l p u r p o s e s , i n p a r t o r i n wh o l e , i s n o t p e r m itte d u n le s s a uth o ris e d b y V olk s w a g e n A G . V olks w a g e n A G d o e s n ot g u ara nte e o r a c c e p t a n y lia b ilit y w it h r e s p e c t t o t h e c o r r e c t n e s s o f i n f o r m a ti o n in t h is d o c u m e n t. C o p yrig ht b y V olk s w a g e n A G . 00 – Technical Data 1 General Information (Edition 09.2012) ⇒ “1.1 Chassis Evaluation Checklist for Accident Vehicles”, page 1 ⇒ “1.2 General Information”, page 2 1.1 Chassis Evaluation Checklist for Acci‐ dent Vehicles When servicing load-bearing or wheel-supporting components on accident vehicles, damages on suspension could remain undis‐ covered. These undiscovered damages may lead to heavy dam‐ ages in continued vehicle operation. Therefore, on accident vehicles, the listed components must be checked in the described manner and sequence, independent of performing a vehicle align‐ ment. If no deviations from specified values were determined during vehicle alignment, no deformations of the suspension are present. Visual and Function Check of Steering System ♦ Visual check for deformations and cracks. ♦ Check for play in tie rod joints and steering gear. ♦ Visual inspection for faulty bellows and grease boots. ♦ Check electric and hydraulic lines and hoses for chafe marks, cuts and kinks. ♦ Check hydraulic lines, bolted connections and steering gear for leaks. ♦ Check steering gear and lines for proper seating. ♦ Check proper function through entire steering angle by turning steering wheel from stop to stop. Steering wheel must be ro‐ tary without hitching at equal force. Visual and Function Check of Suspension • Observe the sequence of the following test steps! ♦ Check all components shown in assembly overviews for de‐ formation, cracks and other damages. ♦ Replace damaged components. ♦ Perform vehicle alignment on wheel alignment stand approved by VOLKSWAGEN AG. Visual and Function Check For Wheels, Tires ♦ Check for run-out and imbalance, refer to ⇒ Wheel and Tire Guide - Non-Current Models; Rep. Gr. 44 ; General Informa‐ tion ♦ Check tires for cuts and impact damage in tread and on sides, refer to ⇒ Wheel and Tire Guide - Non-Current Models; Rep. Gr. 44 ; General Information . ♦ Check tire inflation pressure; inflation pressure see inflation pressure plate in tank flap, refer to Maintenance Booklet Tires, Checking Condition, Wear Pattern, Tire Pressure, Tread Depth. Touareg 2003 ➤ Suspension, Wheels, Steering - Edition 09.2012 1. General Information 1
P rote cte d b y c o p yrig ht. C o p yin g fo r p riv a t e o r c o m m e r c i a l p u r p o s e s , i n p a r t o r i n wh o l e , i s n o t p e r m itte d u n le s s a uth o ris e d b y V olk s w a g e n A G . V olks w a g e n A G d o e s n ot g u ara nte e o r a c c e p t a n y lia b ilit y w it h r e s p e c t t o t h e c o r r e c t n e s s o f i n f o r m a ti o n in t h is d o c u m e n t. C o p yrig ht b y V olk s w a g e n A G . For damage on wheel and/or tire, tire must be replaced. This also applies when the course of the accident and damage on the ve‐ hicle points to possible non-visible damages. Another determining factor is the age of the tires: Tires should not be older than 6 years. In Case of Doubt, Always Proceed As Follows: • As soon as a safety risk cannot be ruled out, the tire(s) must be replaced. Entire Vehicle Also check other vehicle systems as, for example: ♦ Brake system including Anti-lock Brake (ABS). ♦ Exhaust system and passenger protection by visual and func‐ tion check. Test values, adjustment values and notes can be found in re‐ spective repair manuals/ELSA. Checking of accident vehicles described here, refers to suspen‐ sion and does not lay claim to completeness for entire vehicle. Electronic Vehicle Systems Safety-related system such as: ABS/EDL; Airbag; Electronically regulated vehicle systems; Electro-mechanical; Electro-hydraulic steering and other driver assistance systems must be queried for fault codes that could possibly be stored, using the Vehicle Diag‐ nostic Tester . Stored DTCs of systems mentioned must be serviced according to specifications in repair manual/ELSA. When service work is done, check affected systems again for DTC memory to ensure function is established again. 1.2 General Information Information on wheels, tires and snow chains can be found in the “Wheel and Tire Guide” in ⇒ Wheel and Tire Guide - Non-Current Models; Rep. Gr. 44 ; General Information . Touareg 2003 ➤ Suspension, Wheels, Steering - Edition 09.2012 2 Rep. Gr.00 - Technical Data
P rote cte d b y c o p yrig ht. C o p yin g fo r p riv a t e o r c o m m e r c i a l p u r p o s e s , i n p a r t o r i n wh o l e , i s n o t p e r m itte d u n le s s a uth o ris e d b y V olk s w a g e n A G . V olks w a g e n A G d o e s n ot g u ara nte e o r a c c e p t a n y lia b ilit y w it h r e s p e c t t o t h e c o r r e c t n e s s o f i n f o r m a ti o n in t h is d o c u m e n t. C o p yrig ht b y V olk s w a g e n A G . 40 – Front Suspension 1 General Information ⇒ “1.1 Air Spring Damper, Repair Information”, page 3 ⇒ “1.2 Air Spring Shock Absorber”, page 4 ⇒ “1.3 Air Spring Damper, Filling”, page 4 ⇒ “1.4 Bolts and Nuts”, page 6 ⇒ “1.5 Decoupling Stabilizer Bar Hydraulic System, Checking Oil Level and Filling”, page 6 ⇒ “1.6 Decoupling Stabilizer Bar, Bleeding”, page 7 ⇒ “1.7 Evaluating Accident Vehicles”, page 7 ⇒ “1.8 Longitudinal Member Threads, Servicing”, page 8 ⇒ “1.9 Lower Spacer, Allocating”, page 8 ⇒ “1.10 Residual Pressure Retaining Valve”, page 8 ⇒ “1.11 Seals, Sealing Rings”, page 8 ⇒ “1.12 Subframe, Securing”, page 8 ⇒ “1.13 Wheel Bearing, Bringing to Curb Weight Position”, page 10 1.1 Air Spring Damper, Repair Information When the vehicle has been driven 200,000 km, if there is damage to an air spring, it is recommended that the opposite air spring is also replaced. If shock absorbers leak, replace air suspension strut completely because shock absorber oil can damage the boot -item 4- ⇒ Item 4 (page 17 ) . Air spring must not be rotated when it is depressurized. There is the danger that the boot inside the air spring could be damaged by kinking or folding. The maximum possible care, cleanliness and proper tools are essential to ensure satisfactory and successful air spring damper repairs. Understandably, general safety guidelines apply when performing repairs. A series of applicable general notes for individual repair proce‐ dures - otherwise listed several times at many points in the repair manual - has been collected here. They apply to all air spring damper repairs. A description of the design and function of air suspension can be found in Self Study Program No. 302 The Touareg Chassis and All Wheel Drive Design. Touareg 2003 ➤ Suspension, Wheels, Steering - Edition 09.2012 1. General Information 3
P rote cte d b y c o p yrig ht. C o p yin g fo r p riv a t e o r c o m m e r c i a l p u r p o s e s , i n p a r t o r i n wh o l e , i s n o t p e r m itte d u n le s s a uth o ris e d b y V olk s w a g e n A G . V olks w a g e n A G d o e s n ot g u ara nte e o r a c c e p t a n y lia b ilit y w it h r e s p e c t t o t h e c o r r e c t n e s s o f i n f o r m a ti o n in t h is d o c u m e n t. C o p yrig ht b y V olk s w a g e n A G . 1.2 Air Spring Shock Absorber – Before loosening air line when installed, check, whether air spring is still filled with a residual pressure of approximately 3 bar. – Press with thumbs on air spring bead. The bead must dem‐ onstrate noticeable resistance. – If great resistance is not noticed, air spring is not pressurized and it must be replaced together with the residual pressure retaining valve. ♦ Thoroughly clean connecting points and their surrounding areas before loosening. ♦ To install air spring damper, it must be filled with argon or cor‐ gon gas. Refer to ⇒ “1.3 Air Spring Damper, Filling”, page 4 . ♦ Place removed parts on a clean surface and cover to prevent contamination. Use foils and paper. Only use lint-free cloths! ♦ Only install clean components: Only unpack replacement parts immediately prior to installation. ♦ Only use lubricants indicated by part number. ♦ Carefully cover or seal open components, if repairs are not carried out immediately. 1.3 Air Spring Damper, Filling Special tools and workshop equipment required ♦ Adapter - T10157/1- ♦ Air Suspension Strut Charger - VAS 6231- ♦ Steel gas cylinder filled with Argon or Corgon, not depicted Note Air spring shock absorbers are supplied as replacement parts with a minimum pressure. By sitting in storage for extended periods this pressure can diminish (just like a tire). This minimum pressure must be checked and if necessary restored by recharging before air spring shock absorber is removed from the packaging. If air spring shock absorber is removed from the packaging without this checking/recharging, this may cause indentations or kinks to form in the dust boot before it reaches its normal shape. These inden‐ tations lead to preliminary damage and may lead to premature failure. – Remove the cover from the packaging. – Remove union bolt -arrow- from the residual pressure holding valve. – Close the valve of the steel gas bottle. – Become familiar with the relevant rules for the prevention of accidents for pressurized containers and technical gases. Touareg 2003 ➤ Suspension, Wheels, Steering - Edition 09.2012 4 Rep. Gr.40 - Front Suspension
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