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Johnson Service Bulletin #911 - Loctite Sealant, Grade "D"

Issued June 21, 1962, this bulletin specifies Loctite Grade "D" for the clutch-spring retaining set screws in 40 and 75 h.p. Electramatic gearcases. It includes application, removal and ordering instructions. The original Stevens Experimental Company order form is preserved as an image on the third page.

Johnson Motors blue Service Bulletin letterhead
June 21, 1962Bulletin No. SB-911
Gearcases-ELECTRAMATIC

SUBJECT:  Loctite sealant, grade "D".
         40 h.p. ELECTRAMATIC RK(L)-24 series,
         75 h.p. ELECTRAMATIC V4A(L)-14 series.

Factory illustration of Electramatic gearcase clutch spring and set screw assembly

Forward and reverse gears of the ELECTRAMATIC engines use allen head set screws to secure the clutch spring in place. To insure against these screws vibrating loose and causing internal gearcase damage, LOCTITE SEALANT, GRADE "D", is specified and used to provide additional holding power, a function which it performs very efficiently.

Loctite sealant grade "D" is a thin, orange-colored liquid that hardens into a tough plastic bond by chemical action when confined between closely fitting metal parts. A film of sealant remains liquid as long as it is exposed to air. This feature offers the advantage of not having to unduly rush assembly and provides excellent storage life.

Because this grade's high holding power, it can strip threads in aluminum. It should therefore be used only on the set screws specified in paragraph one (1). There is no shrinkage as Loctite hardens.

TO USE LOCTITE:

  1. Clean set screws and gears with a degreasing solvent and allow to dry. (Parts must be free of grease, oil and grime for Loctite to function efficiently.)
  2. Apply Loctite sparingly to threads of each set screw, (one (1) drop is the very maximum.) Avoid entry into moving parts.
  3. Insert screws and torque 15-20 inch pounds.
  4. After torquing, allow gear and clutch spring assemblies to stand for several hours at normal room temperature (about 70°F.) prior to assembly into gearcase. For those who have oven facilities, hardening time can be reduced to ten (10) minutes by baking at 200° to 225°F.

REMOVING LOCTITE TREATED SCREWS:

  1. Treated set screws can be removed without special methods or tools other than those required to torque.
  2. Treated screws and or parts can be reused without the necessity to clean off the old hardened Loctite. Simply clean off grease and oil, allow to dry and reapply Loctite sealant.

AVAILABILITY:

Loctite grade "D" is not readily available except from STEVENS EXPERIMENTAL CO., 2015 Grand Avenue, Waukegan, Illinois. This firm supplies it in 2cc squeeze tubes (50-100 applications) at the net price of 89¢ per tube, postage prepaid. Order by their part number S-26.

SB-911
Page 2

SPECIAL NOTE:

Please remember that only the following listed items are now shipped postage prepaid by the Stevens Experimental Company:

  1. Loctite Sealant, Grade "D".
  2. Thermomelt temperature stiks.
  3. Ignition keys, and
  4. Needle bearing assembly grease.

All other items and parts which were formerly listed as being prepaid are now and have for sometime been shipped F.O.B. Waukegan, Illinois.

JOHNSON MOTORS
W. W. DeWees
Service Department

WWD:eb

NOTE: Post on your RK and V-75 indexes.

Original 1962 Stevens Experimental Company order form for Loctite Grade D, part S-26, showing 89-cent price and blank order fields

Related documents

SB-909 (1962) - Needle bearing assembly grease, another Stevens Experimental Company product referenced in this bulletin.