Volkswagen New Beetle. Manual - part 74

 

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Volkswagen New Beetle. Manual - part 74

 

 

Timing chains will stretch during operation. Limits are placed upon amount of stretch before replacement is 
required. Timing chain stretch will alter ignition timing and valve timing.  

To check timing chain stretch, rotate crankshaft to eliminate slack from one side of timing chain. Mark 
reference point on cylinder block. Rotate crankshaft in opposite direction to eliminate slack from remaining side 
of timing chain. Force other side of chain outward and measure distance between reference point and timing 
chain. See Fig. 23 . Replace timing chain and gears if not within specification.  

Fig. 23: Measuring Timing Chain Stretch 

Timing chains must be installed so timing marks on camshaft gear and crankshaft gear are aligned according to 
manufacturer. See Fig. 24 .  

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Engine Overhaul Procedures

  

Fig. 24: Typical Gear Timing Mark Alignment 

TIMING BELTS 

Cogged tooth belts are commonly used on overhead cam engines. Inspect belt teeth for rounded corners or 
cracking. Replace belt if it is cracked, damaged, missing teeth or oil soaked.  

Used timing belt must be installed in original direction of rotation. Inspect all sprocket teeth for wear. Replace 
all worn sprockets. Sprockets are marked for timing purposes. Engine is positioned so that crankshaft sprocket 
mark will be upward. Camshaft sprocket is aligned with reference mark on cylinder head or timing belt cover 
and then timing belt can be installed. See Fig. 25 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Engine Overhaul Procedures

  

Fig. 25: Typical Camshaft Belt Sprocket Alignment 

TENSION ADJUSTMENT 

If guide rails are used with spring loaded tensioners, ensure at least half of original rail thickness remains. 
Spring loaded tensioner should be inspected for damage.  

Ensure all timing marks are aligned. Adjust belt tension using manufacturer's recommendations. Belt tension 
may require checking using tension gauge. See Fig. 26 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Engine Overhaul Procedures

  

Fig. 26: Adjusting Typical Timing Belt Tension 

TIMING GEARS 

TIMING GEAR BACKLASH & RUNOUT 

On engines where camshaft gear operates directly on crankshaft gear, gear backlash and runout must be 
checked. To check backlash, install dial indicator with tip resting on tooth of camshaft gear. Rotate camshaft 
gear as far as possible. Adjust indicator to zero. Rotate camshaft gear in opposite direction as far as possible and 
note reading.  

To determine timing gear runout, mount dial indicator with tip resting on face edge of camshaft gear. Adjust 

 

1998 Chevrolet Pickup C1500 

GENERAL INFORMATION Engine Overhaul Procedures

  

 

 

 

 

 

 

 

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