Repair and restoration of a Seiko 6139 chronograph from 1974

Описание

This video documents the restoration and repair of a Seiko 6139-8040 from November 1974. This is a warts-and-all account of a process whose conduct was severely hampered by its documentation. This restoration features a number of commonly-encountered faults that can afflict Seiko 6139 movements, the most conspicuous of which, a broken chronograph wheel discovered very late in the process.

0:00 Introduction
0:28 Checking it out
1:47 First look at the movement
3:36 Preliminary timegrapher measurement
3:50 Dismantling the movement begins
4:28 Uncasing the movement
5:10 Removing the sub-dial hand
5:29 Calendar parts
8:01 Chronograph bridge
8:32 Hammer and coupling lever springs
9:21 Coupling levers
10:12 Letting down the mainspring
10:35 Ratchet wheel and click spring
11:10 L-shaped plate
11:27 Pallet fork
11:50 Castle wheel
12:05 Barrel and train wheel bridge
12:30 Gear train
13:08 Cannon pinion
13:20 Centre wheel
13:51 Diafix removal
14:25 Setting parts
15:00 Mainspring
16:18 Cleaning
18:10 Reassembly
22:10 Spot the mistake
22:30 Reassembly continues
26:02 Refitting the springs
27:53 Correcting the mistake
31:26 Oiling the Diashock setting
32:13 Chronograph wheel finger in action
32:45 Dial side assembly
36:40 Fitting the dial and hands
39:18 Chronograph timing check
39:53 Slipping clutch and finding a new chronograph wheel
40:23 Fitting the new chronograph wheel
41:49 Fitting a new crystal and recasing the movement
44:00 The finished article