Oil Pump: Inspection

If necessary, repair the cylinder block.

Fig 1: Checking Oil Jet For Damage Or Clogging

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1. Coat the valve with engine oil, and then check that the valve 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 Oil Pump Relief Valve

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1. Using a feeler gauge and precision straightedge, measure the clearance between the rotors and precision straightedge.

   Standard clearance: 

   0.030 to 0.085 mm (0.00118 to 0.00335 in.) 

   Maximum clearance: 

   0.160 mm (0.00630 in.) 

   If the side clearance is greater than the maximum, replace the oil pump assembly.

   Fig 3: Measuring Clearance Between Rotors And Precision Straightedge

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

   Standard clearance: 

   0.080 to 0.160 mm (0.00315 to 0.00630 in.) 

   Maximum clearance: 

   0.35 mm (0.0138 in.) 

   If the tip clearance is greater than the maximum, replace the oil pump assembly.

   Fig 4: Measuring Clearance Between Drive And Driven Rotor Tips

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

   Standard clearance: 

   0.100 to 0.170 mm (0.00394 to 0.00669 in.) 

   Maximum clearance: 

   0.325 mm (0.0128 in.) 

   If the body clearance is greater than the maximum, replace the oil pump assembly.

   Fig 5: Measuring Clearance Between Driven Rotor And Pump Body

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Maximum wear: 

0.5 mm (0.0197 in.) 

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

Fig 6: Measuring Chain Tensioner Plate Wear

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