Section 15 · Pages 45–54 (10 pages)

Hydra-Matic Drive: Description and Diagnosis

From the 1951 Cadillac Shop Manual Supplement

Opens the Hydra-Matic section with its contents list and a description of the 1951 changes: a cone-type reverse unit that lets the car be rocked, a reverse booster plug raising line pressure to about 180 psi, new front servo exhaust and reverse check valves, and a parking bracket with reverse and parking blocker pistons. Diagnosis follows: shop and road tests for slippage, the Cadillac Hydra-Matic diagnosis guide, a reverse unit diagnosis chart and air checks of each oil circuit.

Read this section free, starting at page 45

What this section covers

  • Cone-type reverse unit and parking bracket
  • Shop and road tests for slippage
  • Hydra-Matic diagnosis guide
  • Reverse unit diagnosis chart
  • Air checking oil circuits
  • Visual check of clutch hydraulics
Year
1951
Make
Cadillac
Vehicle
Components and Systems, Hydra-Matic, Passenger Cars, Transmissions
Type
Service Manual, Supplement
Models
Series 61, 62, 60 Special, 75 and 86 Commercial Chassis; 331 cu. in. V-8
Pages
113

What’s inside

Service supplement

  1. Cover, Craftsman Code and ContentsCover, title page of the Cadillac Service Department, the Cadillac Craftsman Code and Certified Craftsman's League, and the section contents list.pp. 1–4
  2. 1General InformationForeword explaining use with the 1950 Shop Manual, a table of the 1951 series with bore, stroke, wheelbase and starting engine numbers, and the locations of engine serial, engine unit, body and Hydra-Matic numbers.pp. 5–6
  3. 2Lubrication and Preventive Maintenancepp. 7–13
  4. 3Bodypp. 14–25
  5. 4Chassis Sheet MetalThe new five-piece front bumper assembly with its removal, disassembly and installation torques, and the hood lock release lever below the grille.pp. 26–26
  6. 5FrameX-type frame description, body bolt locations by body style with torque values, and a frame checking dimension chart for every series.pp. 27–28
  7. 6Chassis SuspensionChanges in spring heights and the relocated eccentric bushing hex end, adjusted from the front with Tool J-4691.pp. 29–29
  8. 7SteeringSteering gear notes, with changes to steering column removal and installation caused by the 1951 instrument panel design.pp. 30–30
  9. 8Rear AxleRear axle gear ratios for each 1951 series (3.36, 3.77 and 4.27 to 1) and their identification marks on the axle case.pp. 31–31
  10. 9BrakesThe new mechanical stoplight switch and self-adjusting slipper anchor on Series 61, 62 and 60 Special, with minor and major brake adjustment and stoplight switch replacement.pp. 32–33
  11. 10Engine MechanicalChanges to the 331 cu. in. V-8 (redesigned pistons, valve guides without counterbores), valve guide installation with Tool J-3066 adapters and piston pin removal and installation with Tool J-3848.pp. 34–35
  12. 11Engine ElectricalA one-page note that 1950 Shop Manual engine electrical information applies to 1951 cars.pp. 36–36
  13. 12Engine Fuel and Exhaustpp. 37–43
  14. 13Engine Cooling; Clutch and Synchro-Mesh TransmissionSections 13 and 14 share one page, each referring to the 1950 Shop Manual for cooling system, clutch and Synchro-Mesh service.pp. 44–44
  15. 15Hydra-Matic Drive: Description and Diagnosispp. 45–54
  16. 15Hydra-Matic Drive: On-Car Service and Removalpp. 55–59
  17. 15Hydra-Matic Drive: Disassembly and Inspectionpp. 60–69
  18. 15Hydra-Matic Drive: Unit Assembly, Pumps, Governor and Servospp. 70–79
  19. 15Hydra-Matic Drive: Control Valve, Parking Brake and Installationpp. 80–87
  20. 16Chassis Electricalpp. 88–93
  21. 17AccessoriesStandard and automatic heating systems with the rear window defogging blower, Signal-Seeking radio fader and foot tuning switch, push-button radio and fog lamp switch locations.pp. 94–94

Specifications, torques and tools

  1. 18Specificationspp. 95–105
  2. 19Torque TightnessesTorque tables by bolt location and size for body, frame and bumpers, suspension, steering, rear axle, brakes, engine, fuel and exhaust, cooling, clutch, Hydra-Matic and sheet metal.pp. 106–108
  3. 20Special Toolspp. 109–113

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