Pages 30–38 (9 pages)

Rebuilding late 1938 and 1939 shock absorbers (81A, 91A and 99A types)

From the 1928–1940 Ford Houdaille Shock Absorber Service Bulletin

Rebuilding procedure for the 81A, 91A and Mercury 99A units into 81A-18045-B, 91A-18045-C and D, and 99A-18080-C types. Includes abutment flange removal, early and late reservoir dowel pin designs, shaft and flange part numbers, cleaning by fluid base, reassembly, fluid filling and lever mounting.

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What this section covers

  • Abutment flange removal
  • Early and late reservoir dowel pins
  • Shaft and flange part numbers
  • Fluid base identification
  • Reassembly, fluid fill and lever mounting
Year
1928, 1929, 1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940
Make
Ford, Houdaille
Vehicle
Components and Systems, Suspension and Steering
Type
Service Bulletin
Models
Ford Model A, B, 18, 40, 48, 68, 74, 78, 81A, 91A, 01A and Mercury 99A, 1928–1940
Publication
Subject No. 18080
Pages
42

What’s inside

Service bulletin

  1. Cover, contents and service recommendationsCover note, table of contents dated January 1, 1940, and the recommended procedure for restoring ride quality: tire pressure, spring lubricant, fluid level, leakage and valve pointer settings.pp. 1–3
  2. Operating principle, fluid and valve adjustmentpp. 4–7
  3. Guide sheets: shocks, levers, links and parts kitspp. 8–11
  4. Rebuilding 1933-1936 shock absorbers (48-18015 and 40-18015 types)pp. 12–19
  5. Rebuilding 1937 and early 1938 shock absorbers (68 and 81A types)pp. 20–29
  6. Rebuilding late 1938 and 1939 shock absorbers (81A, 91A and 99A types)pp. 30–38
  7. Instructions for peening valve spoolHow to check whether the spool in the lower end of the shaft has turned, using gauge plate HEC-4953, and how to realign and peen it with drift HEC-4891.pp. 39–40
  8. Functioning diagram of 1940 shock absorbersTwo Ford Motor Company service bulletin sheets dated October 6, 1939 showing compression stroke and rebound stroke flow in the 1940-type instrument, with the replenishing valve and valve adjusting end labeled.pp. 41–42