Tip Clearance

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Oil Pump Measurement

Courtesy of DAIMLERCHRYSLER CORP.

1 - MEASURE 37MM FROM THE CORNER OF CRESCENT

2 - TIGHT MESH HERE

3 - MEASURE TIP CLEARANCE HERE

Tip clearance is the difference between the tip diameters of the gear teeth and the corresponding diameters of the pocket in the pump housing.

Tip clearance for the inner gear can be checked by moving the inner gear into tight mesh (2) with the outer gear as shown. Clearance between the ID of the crescent feature of the housing and the OD of the teeth of the inner gear (3) should then me measured at a point 37 mm from the corner of the crescent (1) feature, as shown below. See Fig 1.

Acceptable tip clearance for inner gear:

0.85 mm (0.033 in) max