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TECH GUIDES

Step-by-step procedures, torque specifications, and upgrade paths for MK4 platform vehicles.

Engine
1.8T Timing Belt Replacement
ADVANCED · 4-6 hours
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Complete timing belt kit installation with water pump, tensioner, and idler. Step-by-step with alignment marks.

PROCEDURE
  1. Remove engine covers, serpentine belt, and accessories for access
  2. Set engine to TDC on cylinder 1 — verify cam and crank alignment marks
  3. Remove upper and lower timing covers (10mm bolts)
  4. Mark belt rotation direction if reusing (not recommended)
  5. Loosen tensioner and remove old belt, tensioner, idler, and water pump
  6. Install new water pump with fresh O-ring (15 Nm)
  7. Install new tensioner (25 Nm) and idler roller
  8. Route new belt: crank → water pump → tensioner → exhaust cam → intake cam → idler
  9. Set tensioner to proper tension using alignment tab/tool
  10. Rotate engine 2 full revolutions by hand — re-verify all alignment marks
  11. Reinstall covers, accessories, and serpentine belt
PARTS NEEDED
  • 06B 109 119 B — Timing belt (Continental/Gates)
  • 06A 121 012 G — Water pump (Graf or Hepu)
  • 06D 109 243 C — Belt tensioner (INA/SKF)
  • 06B 109 244 — Idler roller
  • Coolant (G12/G13) for refill
This is an interference engine — belt failure = bent valves. Follow VW service interval (every 75,000 miles or 5 years).
Always replace water pump with timing belt — labor is the same, and WP failure causes belt failure.
K04 Turbo Upgrade Guide
ADVANCED · 8-12 hours
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Upgrading from K03s to K04 turbo with supporting modifications, tuning, and fueling requirements.

PROCEDURE
  1. Flash K04 software (APR, Unitronic, or Eurodyne) before hardware install
  2. Remove front bumper and intercooler for turbo access
  3. Disconnect oil feed/return lines, coolant lines, exhaust downpipe, and intake piping
  4. Remove exhaust manifold heat shield and turbo-to-manifold nuts (3× 13mm)
  5. Remove K03s turbo assembly
  6. Transfer oil feed banjo fitting (use new crush washers)
  7. Install K04 turbo with new gasket to exhaust manifold (25 Nm)
  8. Reconnect oil feed (new banjo bolt + restrictor), oil return, and coolant lines
  9. Install upgraded front-mount intercooler (FMIC) with piping
  10. Install 3" downpipe (catted or test pipe)
  11. Upgrade diverter valve to 710N if not already done
  12. Install upgraded injectors (550cc minimum) and fuel pump if targeting 300+ WHP
  13. Start engine, check for boost leaks with VCDS boost test
  14. Verify tune is loading proper boost targets via VCDS logging
PARTS NEEDED
  • K04-001 or K04-023 turbo
  • K04 exhaust manifold (or K03/K04 hybrid setup)
  • Front-mount intercooler kit
  • 3" stainless downpipe
  • 710N diverter valve (06A 145 710 N)
  • New oil feed line with crush washers
  • Upgraded injectors (550cc+ for 300 WHP target)
  • ECU tune (K04 file required)
Do NOT run K04 hardware without a K04-specific tune. The stock tune cannot control the larger turbo properly and will cause overboosting.
1.8T Camshaft & Head Upgrade Reference
REFERENCE · VIEW FULL GUIDE →
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AWP Engine - Complete Technical Specifications
REFERENCE · VIEW FULL GUIDE →
→
Brakes
312mm Big Brake Upgrade
INTERMEDIATE · 3-4 hours
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Upgrading from 288mm to 312mm front brakes using Audi TT/R32 carrier brackets with MK4 calipers.

PROCEDURE
  1. Raise vehicle and remove front wheels
  2. Remove caliper (2× 13mm guide pin bolts — 25 Nm) and hang with wire
  3. Remove caliper bracket (2× 18mm bolts — 115 Nm)
  4. Remove 288mm rotor (may need persuasion — tap with rubber mallet)
  5. Install 312mm Audi TT carrier bracket to knuckle (115 Nm)
  6. Install 312mm rotor (clean hub mating surface first)
  7. Reinstall MK4 caliper with new pads onto 312mm carrier
  8. Torque guide pin bolts to 25 Nm
  9. Verify pad clearance — should be 1-2mm each side
  10. Bleed brakes if lines were disconnected
  11. Bed pads: 10 stops from 40 mph with moderate pressure, then 5 stops from 60 mph
PARTS NEEDED
  • 8N0 615 125 / 126 — Audi TT 312mm carrier brackets (L/R)
  • 1J0 615 301 M — 312mm front rotors (or Zimmermann equivalent)
  • Brake pads (Hawk HPS, EBC Redstuff, or Textar OEM)
  • Brake hardware clips (new recommended)
312mm rotors require minimum 15" wheels. Stock 15" steel wheels will NOT clear — verify wheel clearance before ordering.
Brake Fluid Flush Procedure
BEGINNER · 45 minutes
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Proper bleeding sequence and fluid specs for ABS-equipped MK4. Pressure and gravity bleed methods.

PROCEDURE
  1. Use DOT 4 fluid (ATE Typ 200 or Motul RBF 600 for track use)
  2. MK4 bleeding sequence: RR → LR → RF → LF (farthest to nearest)
  3. Open bleed nipple (10 Nm to close), pump pedal 3-4 times, hold
  4. Open nipple, close when pedal hits floor
  5. Repeat until fluid runs clear (no bubbles)
  6. Top off reservoir between each corner
  7. Final pedal should be firm at 1/3 travel
PARTS NEEDED
  • DOT 4 brake fluid (1 liter minimum)
  • 11mm bleed wrench
  • Clear tubing and catch bottle
Suspension
Coilover Installation Guide
INTERMEDIATE · 4-5 hours
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Step-by-step coilover installation for MK4 platform. Front strut and rear shock replacement with alignment notes.

PROCEDURE
  1. Measure and record stock ride height at all 4 corners
  2. Front: Remove 3× top mount nuts (not center nut yet)
  3. Remove pinch bolt at knuckle (70 Nm + 90° for reinstall)
  4. Spread knuckle slightly, remove strut assembly
  5. Compress spring with tool if removing from stock strut
  6. Install coilover — set initial height per manufacturer spec
  7. Torque top mount: 20 Nm (3× nuts), pinch bolt: 70 Nm + 90°
  8. Rear: Remove trunk trim for top mount access
  9. Remove lower shock bolt (100 Nm for reinstall)
  10. Remove top mount nut (60 Nm for reinstall)
  11. Install rear coilover/spring assembly
  12. Set ride height — typical starting point: 25-30mm drop front, 20-25mm rear
  13. Get professional alignment within 50 miles — spec: -1.5° front camber, 0 toe
PARTS NEEDED
  • Coilover set (Bilstein B14, KW V1/V2, or BC Racing BR)
  • New top mount bearings (if not included)
  • New pinch bolts (TTY — replace if stock)
Always get alignment after lowering. Incorrect camber/toe will destroy tires and create unsafe handling.
RELATED PAGES
Audi TT Spindle Upgrade
ADVANCED · 6-8 hours
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Install TT 8N spindles for improved steering geometry, 312mm brake clearance, and better camber curve.

PROCEDURE
  1. Remove front wheels, calipers, rotors, and ABS sensors
  2. Press out ball joint from knuckle (ball joint press required)
  3. Remove tie rod end nut (65 Nm) and separate with puller
  4. Remove axle nut (290 Nm — with wheel on ground or air gun)
  5. Remove pinch bolt and separate strut from knuckle
  6. Remove knuckle/spindle assembly with wheel bearing
  7. Press wheel bearing into TT spindle (or have machine shop do it)
  8. Install TT spindle — reverse of removal
  9. Reinstall ball joint: 50 Nm + 90°
  10. Reinstall pinch bolt: 70 Nm + 90°
  11. Torque axle nut: 290 Nm + additional 90° (TTY — new nut required)
  12. Professional alignment mandatory
PARTS NEEDED
  • 8N0 407 257 / 258 — Audi TT spindles (L/R)
  • New wheel bearings (FAG or SKF)
  • New axle nuts (TTY — single use)
  • New pinch bolts (recommended)
  • New ball joint pinch bolts
Wheel bearing press required — this is not a hammer job. Improper installation will destroy the bearing.
Transmission
Clutch Replacement Guide
ADVANCED · 6-10 hours
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Single and dual-mass flywheel clutch installation for 02M 6-speed and 02J 5-speed transmissions.

PROCEDURE
  1. Drain transmission fluid
  2. Remove axles (30mm axle nuts — 290 Nm, TTY)
  3. Support engine from above with support bar
  4. Remove subframe bolts and lower subframe (if needed for clearance)
  5. Remove starter motor
  6. Remove transmission-to-engine bolts (varies: M10 = 45 Nm, M12 = 60 Nm)
  7. Support transmission with jack, slide back and lower
  8. Remove pressure plate bolts in star pattern (gradually — 22 Nm)
  9. Remove clutch disc and pressure plate
  10. Inspect flywheel — resurface or replace if scored/cracked
  11. If converting DMF to SMF: remove dual-mass flywheel, install SMF + new bolts
  12. Flywheel bolts: 60 Nm + 90° (TTY — always replace)
  13. Install new clutch disc (align with alignment tool)
  14. Install pressure plate — torque in star pattern: 22 Nm
  15. Install new throw-out bearing and pilot bearing
  16. Reinstall transmission — align input shaft carefully
  17. Refill transmission fluid (02M: 75W-90 GL-4, 2.3L)
PARTS NEEDED
  • Clutch kit (Sachs OEM, Southbend Stage 2/3, or DXD)
  • Throw-out bearing (always replace)
  • Pilot bearing (always replace)
  • Flywheel bolts (TTY — always replace)
  • Rear main seal (replace if any leakage)
  • Transmission fluid (G 052 171 A2 or Motul Gear 300 75W-90)
  • New axle nuts (TTY — always replace)
If converting from dual-mass flywheel (DMF) to single-mass (SMF), expect increased gear rattle at idle. This is normal and not harmful. SMF conversions are recommended for any car making over 300 ft-lbs of torque.
Short Shifter Installation
BEGINNER · 1-2 hours
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Installing aftermarket short shift kits and adjusting cable linkage. Covers Diesel Geek, B&M, and 42DD options.

PROCEDURE
  1. Remove shift boot and trim from center console
  2. Disconnect shift cables at transmission end (2× clips)
  3. Remove OEM shift mechanism (4× bolts under console)
  4. Install short shifter assembly per kit instructions
  5. Reconnect shift cables — adjust cable lengths at transmission
  6. Verify all gears engage smoothly including reverse
  7. Reinstall trim and boot
PARTS NEEDED
  • Short shift kit (Diesel Geek Sigma, 42DD, or B&M)
  • New shift cable bushings (recommended — Torque Solution poly)
Hardware Reference
Stretch Bolt (TTY) Identification Guide
REFERENCE · N/A
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How to identify torque-to-yield fasteners, why they cannot be reused, and replacement sources.

VW uses torque-to-yield (TTY) fasteners extensively in the MK4 platform. These bolts are designed to stretch during installation and cannot be reliably re-torqued. Common TTY bolts include: head bolts (40 Nm + 60° + 60°), main cap bolts (30 Nm + 90°), rod bolts (30 Nm + 90°), flywheel bolts (60 Nm + 90°), front axle nuts (290 Nm + 90°), control arm bolts (70 Nm + 90°), strut pinch bolts (70 Nm + 90°), and ball joint bolts (50 Nm + 90°). Always replace with new TTY bolts or upgrade to ARP where available.

QUICK REFERENCE

COMMON TORQUE SPECS

FRONT SUSPENSION

Strut pinch bolts70 Nm + 90°
Strut top mount nuts20 Nm
Control arm bolts70 Nm + 90°
Ball joint to knuckle50 Nm + 90°
Tie rod end nut65 Nm
Sway bar end link50 Nm
Sway bar clamp25 Nm
Subframe bolts100 Nm + 90°
Axle nut290 Nm + 90° (TTY)

REAR SUSPENSION

Shock top mount60 Nm
Shock lower bolt100 Nm
Trailing arm front70 Nm + 90°
Trailing arm rear100 Nm + 90°
Wheel bearing nut175 Nm
Sway bar end link20 Nm
Rear axle beam bolts70 Nm + 90°

BRAKES

Caliper bracket bolts115 Nm
Caliper guide pins25 Nm
Brake hose banjo30 Nm
Wheel bolts (M14×1.5)120 Nm
Bleed nipple10 Nm
Brake line flare nuts14 Nm

ENGINE (1.8T AWP)

Head bolts (OEM TTY)40 Nm + 60° + 60°
Head studs (ARP)75 ft-lbs
Rod bolts (OEM TTY)30 Nm + 90°
Main cap bolts30 Nm + 90°
Timing belt tensioner25 Nm
Water pump15 Nm
Oil drain plug30 Nm
Spark plugs25 Nm
Turbo to manifold25 Nm
Exhaust manifold25 Nm

Always verify specs with factory service manual. Stretch bolts (TTY) require replacement after removal. See our complete AWP torque spec reference for additional data.

RECOMMENDED

ESSENTIAL TOOLS

Torque Wrench 1/2" Drive (10-150 ft-lbs)
VIEW ON AMAZON
Triple Square Bit Set (M5-M12)
VIEW ON AMAZON
OBDEleven or VCDS Scanner
VIEW ON AMAZON
Digital Angle Gauge for TTY Bolts
VIEW ON AMAZON
Ball Joint Press Kit
VIEW ON AMAZON
Spring Compressor Set
VIEW ON AMAZON
Timing Belt Lock Pin Set VW
VIEW ON AMAZON
Brake Bleeder Pressure Kit
VIEW ON AMAZON
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