Service Tool 378103

Universal Tools

378103 Universal Puller Set

Removes flywheels, lower main bearings, and gearcase heads.
Set consists of these separately available components:

(A) 307636 Puller Body
(B) 307637 Pressing Screw
(C) 307638 Handle
(D) 307639 Washer (3), 11A32 in. LD.
(E) 307640 Washer (3), 13/32 in. ID.
(F) 307641 Screw (3), 1/4-20 x 21/3 in.
(G) 307642 Screw (3), 5/16-18 x 23/4 in.
(H) 307645 Center Guide
(I) 309492 Screw (3), 5/16-24 x 27/16 in.
(J) 316982 Screw (2), 5fits-18 x 8 in.
P/N 115308, Screw (2, 2.3, 3.3, 5)
P/n 5000007, Screw and washer kit (40-70 4-Stroke)

Introduced in Johnson Service Bulletin SB-748 (November 11, 1959) as the replacement for discontinued flywheel puller 675025. The bulletin documents its use on all Johnson engines and with adapter kit 378104.

Factory service procedure: Johnson Service Bulletin SB-752 (November 27, 1959) explains flywheel removal on 40 HP models using this puller, including the flywheel-rim shock-absorption procedure.

Additional factory parts breakdown: Johnson Service Bulletin SB-799 (September 22, 1960), a supplement to SB-748 revised April 20, 1960, lists separately serviceable parts and original net prices for puller 378103 and adapter kit 378104. The April 20, 1960 revision of SB-748 has not yet been located.