Tools Required

• SA91101NE Feeler Gauge Set

1. Disassemble pressure relief valve.
   Fig 1: Disassembling Pressure Relief Valve

   Courtesy of GENERAL MOTORS CORP.
2. Remove gerotor cover and bolts.
3. Clean all parts in cleaning solvent. Remove varnish, sludge and dirt.
   Fig 2: Removing Gerotor Cover And Bolts

   Courtesy of GENERAL MOTORS CORP.
4. Inspect body clearance:
   1. 4.1 Using a feeler gauge Service Tool SA 91101NE (or equivalent), measure the clearance between the driven rotor and pump body.

      Driven Rotor-to-Pump Body Side Clearance Standard: 0.150-0.277 mm (0.006-0.011 in.) Service Limit: 0.277 mm (0.011 in.) max. 

   2. 4.2 If the clearance is greater than maximum, replace the front cover assembly.
      Fig 3: Inspecting Body Clearance

      Courtesy of GENERAL MOTORS CORP.
5. Inspect tip clearance:

   Using a Feeler Gauge Set SA91101NE (or equivalent), measure the clearance between both rotor tips.

   Rotor Tip Clearance 

   Service Limit: 0.150 mm (0.006 in.) max. 

   Fig 4: Inspecting Tip Clearance

   Courtesy of GENERAL MOTORS CORP.
6. Inspect end-to-end clearance: Using a Feeler Gauge Set SA91101NE (or equivalent) or Plastigage® (or equivalent) measure the clearance between the side of the gerotor assembly and the cover plate.

Rotor-to-Cover Side Clearance 

Standard: 0.040-0.125 mm (0.0016-0.0049 in.) 

Service Limit: 0.128 mm (0.005 in.) max. 

Fig 5: Inspecting End-To-End Clearance

Courtesy of GENERAL MOTORS CORP.