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Berkeley Jet Drive Overhaul Service Manual

Table of Contents

• Introduction to Jet Drives.
  • About Jet Drives
  • Specific to Berkeley Jet Drives
  • Principles of operation
  • Dynamometer theory
    • Schematic
• Impeller to engine matching
  • Impeller curves
  • Basic engine curves
  • Match per operator requirement
  • Variations for modified engines
• Trouble Shooting Check List
  • Excess RPM's
    • Debris in jet
    • Something in impeller
    • Wear ring clearance
    • Worn or dinged impeller
    • High horsepower and big loads
    • Air ingestion
    • Loss of speed
  • Loss of engine RPM's
    • Fuel
    • Engine tune
    • Overheat
    • Bad thrust bearing
    • Something wrapped in shaft
  • Loss of boat speed - constant RPM's
    • Added operating weight
    • Reverse gate drag
    • Bottom spray drag
    • Warped boat bottoms
    • Dirty boat bottoms
  • Unusual noises
    • Clatter or knocking sound
    • Grinding or rubbing sound
    • Squealing or high pitched rotating noise
    • Hammering or thudding sensation
  • Water leaks
    • Packing gland
    • Suction piece gaskets
    • Transom adapter seal
      • Bowl to adapter
      • Adapter to transom
    • Inspection cap/extension
    • Cooling water hose
    • Cable thru hull attachments
• Overhaul of Jet Drives
  • Steering and reversing mechanism
  • Impeller and wear ring
  • Bowl/bowl bearing
  • Suction piece/packing gland
  • Shaft and bearing assembly