🔧 Hyundai Atos Prime 1.1 G4HG Timing Marks Setup

⚠️ Before You Start

• Disconnect battery
• Remove:
  
  • Right front wheel
  • Engine mount (if blocking)
  • Timing covers
• Use a 17mm socket to turn crankshaft clockwise only

Timing marks are on:

• Camshaft pulley (top)
• Crankshaft sprocket (bottom)

🧭 STEP 1: Set Engine to TDC (Top Dead Center)

1. Turn the crankshaft clockwise
2. Align the crankshaft timing mark:
   
   • Mark on crank gear must line up with the mark on engine block / oil pump housing
3. At this point:
   
   • Piston 1 is at TDC (compression stroke)

👉 If cam is not aligned, rotate crank one more full turn.

🧭 STEP 2: Align Camshaft Timing Mark

1. Look at the cam pulley (top gear)
2. Align:
   
   • The dot/line on cam gear
   • With the pointer or notch on cylinder head

✔️ In your diagram:

• The cam mark is shown at the top (12 o’clock position)

🧭 STEP 3: Check Alignment (VERY IMPORTANT)

Both must be aligned at the same time:

• Cam pulley → mark at top
• Crank pulley → mark at bottom aligned with block

👉 If even 1 tooth off → engine will:

• Misfire
• Lose power
• Possibly bend valves (if badly off)

🧭 STEP 4: Install Timing Belt

1. Start from crankshaft
2. Route belt in this order:
   
   • Crank → tensioner → camshaft
3. Keep belt tight on non-tension side (right side)

🧭 STEP 5: Set Tensioner

1. Loosen tensioner bolt
2. Let spring apply tension OR manually tension
3. Tighten tensioner bolt

👉 Typical torque (approx from diagram):

• Around 22–30 Nm for tensioner area
• Crank bolt higher (100+ Nm range)

🧭 STEP 6: Rotate Engine (CRITICAL CHECK)

1. Turn crankshaft 2 full rotations clockwise
2. Re-check:
   
   • Cam mark still aligned
   • Crank mark still aligned

✔️ If not aligned → redo timing

🧭 STEP 7: Final Assembly

• Reinstall:
  
  • Covers
  • Engine mount
  • Wheel
• Start engine and listen:
  
  • No knocking
  • Smooth idle

🧠 Pro Tips (From Real Workshop Experience)

• Always rotate clockwise only
• Never use starter motor to “test” timing
• If unsure, lock cam & crank before removing belt
• Replace:
  
  • Tensioner
  • Belt (recommended every ~35,000–100,000 km depending source)

🔍 How Your Diagram Matches This

From your image:

• CA = Camshaft
• CS = Crankshaft
• T = Tensioner
• Marks shown:
  
  • Cam → top alignment
  • Crank → bottom alignment
  • Belt path clearly illustrated

  • The G4HG 1.1 engine is part of Hyundai’s Epsilon family used in:

    • Atos
    • i10

    So guides for i10 G4HG also apply.