Oil Pump: Inspection

Fig 1: Checking Oil Jet

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Check the oil jet for damage or clogging.

If necessary, replace the cylinder block.

Fig 2: Inspecting Relief Valve

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Coat the valve with engine oil and check that it falls smoothly into the valve hole by its own weight.

If it does not, replace the relief valve. If necessary, replace the oil pump assembly.

1. Place the drive and driven rotors into the oil pump body. (See REASSEMBLY ).
2. Inspect for the tip clearance.
   Fig 3: Measuring Clearance Between Drive & Drive Rotor Tips

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Using a feeler gauge, measure the clearance between the drive and driven rotor tips.

   1. Standard tip clearance: 0.080 - 0.160 mm (0.0031 - 0.0063 in.) 
   2. Maximum tip clearance: 0.35 mm (0.0138 in.) 

   If the tip clearance is greater than maximum, replace the rotors as a set.

3. Inspect for the side clearance.

   Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.

   1. Standard side clearance: 0.030 - 0.085 mm (0.0012 - 0.0033 in.) 
   2. Maximum side clearance: 0.16 mm (0.0063 in.) 

   If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

   Fig 4: Measuring Clearance Between Rotor & Precision Straight Edge

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Inspect for the body clearance.

   Using a feeler gauge, measure the clearance between the driven rotor and body.

   1. Standard body clearance: 0.100 - 0.170 mm (0.0039 - 0.067 in.) 
   2. Maximum body clearance: 0.325 mm (0.0128 in.) 

   If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

   Fig 5: Measuring Distance Between Driven Rotor & Body

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1. Using vernier calipers, measure the length of the 8 links with the chain dully stretched.
   1. Maximum chain elongation: 52.4 mm (2.063 in.) 
      Fig 6: Measuring Length Of The 8 Links

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   If the elongation is greater than maximum, replace the chain.

   NOTE: Make the same measurements pulling at 3 or more places selected at random.
2. Wrap the chain around the oil pump sprocket.
3. Using vernier calipers, measure the sprocket diameter with the chain.
   Fig 7: Measuring Sprocket Diameter

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   NOTE: Vernier calipers must contact the chain rollers for measuring
   1. Minimum sprockets diameter (w/ chain): 48.2 mm (1.898 in.) 

   If the diameter is less than minimum, replace the chain and 2 sprockets.

Fig 8: Inspecting Chain Tensioner Plate

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Measure the chain tensioner plate wear.

1. Maximum wear: 0.5 mm (0.020 in.) 

If the wear is greater than maximum, replace the chain tensioner plate.