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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Engine Mechanical - 4.6L - 3 Of 4) >> Off-Vehicle Repair Instructions (2 Of 3) >> Water Crossover Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Water Crossover
    GM1564209Courtesy of GENERAL MOTORS CORP.
  1. Inspect the water crossover for the following:
    • Corrosion or damage to the threads for the MAP sensor bracket bolt (1).
    • Corrosion or damage to the water pump drive belt tensioner/shield mounting bolt holes (2)
    • Corrosion or damage to the water pump sealing area (3)
    • Corrosion or damage to the gasket sealing surfaces (4)
    • Corrosion or damage to the plenum duct sealing area (5)
    2. Fig 2: Identifying Water Crossover
    GM1564211Courtesy of GENERAL MOTORS CORP.
  2. Inspect the water crossover for the following:
    • Corrosion, restrictions or damage to the seal/gasket sealing surfaces for the following:
      • MAP sensor vacuum source port (1)
      • Brake booster vacuum hose source port fitting (2)
      • EVAP emission canister purge valve port (4)
      • EGR valve port (8)
      • EGR inlet pipe port (10)
      • Throttle body mounting surface (17)
    • Corrosion or damage to the threads for the following connections:
      • EVAP emission canister purge valve mounting bolt hole (3)
      • Fuel rail bracket mounting bolt hole (6)
      • EGR valve mounting bolt holes (7)
      • EGR inlet pipe mounting bolt holes (9)
      • Water pump cover bolt holes (13)
      • Engine coolant outlet fitting hole (15)
      • Engine lift bracket bolt holes (16)
    • Corrosion or damage to the throttle body fastener bolt holes (5)
    • Corrosion or damage to the heater inlet fitting (11)
    • Corrosion or damage to the fastener bolt holes (12)
    • Corrosion or damage to the radiator hose outlet (14)
  3. Inspect for damage or serviceability the following components:
    • Water pump and seal
    • Thermostat and seal
    • Water outlet
    • Water pump cover and seal
    • MAP sensor and seal
    • Automatic transmission range selector lever clamp bracket
    • Throttle body
    • Throttle body O-ring
    • Throttle body spacer
    • EGR valve
    • EGR bracket shield
    • EVAP emission canister purge valve
    • Rear lift bracket
    • Engine coolant outlet fitting
    • Heater inlet fitting
    • Bolts and fasteners
  4. Repair or replace the water crossover and/or components as necessary.
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