Timing Chain: Inspection

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT NO. 1 CHAIN TENSIONER
1. Check that the plunger moves smoothly when the ratchet pawl is raised with your finger.
2. Release the ratchet pawl, then check that the plunger is locked in place by the ratchet pawl and does not move when pushed with your finger.
  
  Fig 1: Checking Plunger Moves Smoothly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CHAIN SUB-ASSEMBLY
1. Using a vernier caliper, measure the length of the 16 links with the chain fully stretched.
  Maximum chain elongation: 122.6 mm (4.827 in.)
  
  If the chain elongation is greater than the maximum, replace the chain sub-assembly.
  
  HINT:
  
  Take the measurements at 3 or more places selected at random.
  
  Fig 2: Inspecting Chain Sub-Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT NO. 2 CHAIN SUB-ASSEMBLY
1. Using a vernier caliper, measure the length of the 8 links with the chain fully stretched.
  Maximum chain elongation: 52.4 mm (2.063 in.)
  
  If the chain elongation is greater than the maximum, replace the No. 2 chain sub-assembly.
  
  HINT:
  
  Take the measurements at 3 or more places selected at random.
  
  Fig 3: Measuring Length Of Links With Chain Fully Stretched
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CHAIN TENSIONER SLIPPER
1. Using a vernier caliper, measure the tensioner slipper wear.
  Maximum wear: 1.0 mm (0.039 in.)
  
  If the wear is greater than the maximum, replace the chain tensioner slipper.
  
  Fig 4: Inspecting Chain Tensioner Slipper
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT NO. 1 CHAIN VIBRATION DAMPER
1. Using a vernier caliper, measure the vibration damper wear.
  Maximum wear: 1.0 mm (0.039 in.)
  
  If the wear is greater than the maximum, replace the No. 1 chain vibration damper.
  
  Fig 5: Inspecting Chain Vibration Damper
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CRANKSHAFT TIMING SPROCKET
1. Wrap the chain around the timing sprocket.
2. Using a vernier caliper, measure the timing gear diameter with the chain.
  Minimum gear diameter (with chain): 51.6 mm (2.031 in.)
  
  NOTE: The vernier caliper must be in contact with the chain rollers when measuring.
  
  Fig 6: Measuring Timing Gear Diameter With Chain
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the gear diameter is less than the minimum, replace the chain sub-assembly and crankshaft timing sprocket.
INSPECT OIL PUMP DRIVE SPROCKET
1. Wrap the chain around the drive sprocket.
2. Using a vernier caliper, measure the drive gear diameter with the chain.
  Minimum gear diameter (with chain): 48.2 mm (1.898 in.)
  
  NOTE: The vernier caliper must be in contact with the chain rollers when measuring.
  
  If the gear diameter is less than the minimum, replace the No. 2 chain sub-assembly and oil pump drive sprocket.
  
  Fig 7: Measuring Drive Gear Diameter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP DRIVE SHAFT SPROCKET
1. Wrap the chain around the drive shaft sprocket.
2. Using a vernier caliper, measure the drive shaft gear diameter with the chain.
  Minimum gear diameter (with chain): 48.2 mm (1.898 in.)
  
  NOTE: The vernier caliper must be in contact with the chain rollers when measuring.
  
  If the gear diameter is less than the minimum, replace the No. 2 chain sub-assembly and oil pump drive shaft sprocket.
  
  Fig 8: Measuring Drive Shaft Gear Diameter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002