Oil Pump: Inspection

Check the oil jet for damage or clogging. If necessary, replace the cylinder block.

Fig 1: Inspecting Oil Jet

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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.

Fig 2: Inspecting Relief Valve

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1. Place the drive and driven rotors into the oil pump body (see REASSEMBLY ).
2. Inspect for the tip clearance.

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

   Standard tip clearance: 

   0.080 to 0.160 mm (0.0031 to 0.0063 in.) Maximum tip clearance: 0.35 mm (0.0138 in.) 

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

   Fig 3: Measuring Clearance Between Drive & Driven Rotor Tips

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3. Inspect for the side clearance.

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

   Standard side clearance: 

   0.030 to 0.085 mm (0.0012 to 0.0033 in.) Maximum side clearance: 0.16mm (0.0063 in.) 

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

   Fig 4: Measuring Clearance Between Rotors & Precision Straight Edge

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4. Inspect for the body clearance.

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

   Standard body clearance: 

   0.100 to 0.170 mm (0.0039 to 0.067 in.) Maximum body clearance: 0.325 mm (0.0128 in.) 

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

   Fig 5: Measuring Clearance Between Driven Rotor & Body

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1. Using vernier calipers, measure the length of the 8 links with the chain dully stretched.

   Maximum chain elongation: 52.4 mm (2.063 in.) 

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

   HINT:

   Make the same measurements pulling at 3 or more places selected at random.

2. Wrap the chain around the oil pump sprocket.
   Fig 6: Measuring Length Of 8 Links With Chain Dully Stretched

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3. Using vernier calipers, measure the sprocket diameter with the chain.
   NOTE: Vernier calipers must contact the chain rollers for measuring

   Minimum sprockets diameter (w/chain): 48.2 mm(1.898 in.)

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

   Fig 7: Measuring Sprocket Diameter With Chain

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Measure the chain tensioner plate wear.

Maximum wear: 0.5 mm (0.020 in.) 

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

Fig 8: Measuring Chain Tensioner Plate Wear

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