Miyota 8215 Automatic Watch Movement Disassembly – Part1 - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 07-15-2016, 01:42 PM   #1 (permalink)
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Default Miyota 8215 Automatic Watch Movement Disassembly – Part1

Miyota 8215 Automatic Watch Movement Disassembly – Part1

This is one of many watch disassemblies I used to have on my blog Watchstuff.org. Now I have discontinued the blog (due to lack of time) I thought it might be interesting to post it on this forum???

This is very common 21j (21,600 bpm) automatic movement found in many genuine watches and although cheap to replace can still benefit from a service.

This watch movement is also a direct replacement for the popular Chinese movement DG2813.

The top side of the movement is shown in Figure 1, showing the date wheel, top balance wheel jewel and hour hand pinion.



Figure 1 Top view of movement.



Figure 2 Bottom view of movement.



Figure 3 Close up of balance wheel jewel.

Step 1 – Remove the rotor retaining screw (Part# 925-590) and rotor (Part# 119-246) as shown in Figure 4.



Figure 4 rotor removed.

Step 2 Remove the date dial guard retaining screws (Part# 923-630) and date dial guard (Part# 176-150) as shown in Figure 5.



Figure 5 movement fitted onto movement holder.

Step 3 – Remove the Dial washer (Part# 078-140) and Hour wheel (Part# 075-124) as shown in Figure 6.



Figure 6 Date dial guard removed.

Step 4 – Remove the date wheel (Part# 105-950).

Figure 7 shows a close up of the canon pinion (Part# 014-108), date dial driving wheel (Part# 103-650) and date corrector spring (Part# 903-710).



Figure 7 Hour wheel & dial washer removed.

Step 5 – Remove the date jumper (Part# 109-350), date corrector (Part# 116-300), date corrector spring (Part# 903-710) and intermediate date wheel (Part# 100-170).



Figure 8 Date wheel removed.

Step 6 – Remove the date dial driving wheel retaining screw (Part# 923-600) & date dial driving wheel (Part# 103-650), screws for minute wheel guard (Part# 923-630) and minute wheel guard (Part# 079-600).



Figure 9 date corrector spring, date jumper & date corrector removed.

Step 7 – remove the Yoke retaining screw (Part# 923-640), Yoke (Part# 071-510) and setting wheel (Part# 076-430).



Figure 10 Date dial driving wheel & minute wheel guard removed.



Figure 11 Setting wheel removed & close up of cannon pinion.

Step 8 referring to Figure 12, remove the setting lever retaining screw (Part# 923-640) and the setting lever spring (Part# 077-680).



Figure 12 Yoke removed.

Step 9 – lift up the setting lever (shown in Figure 13) and remove the stem (Part# 065-212) and the clutch wheel (Part# 064-450).



Figure 13 Setting lever spring removed.

I found that the setting lever couldn’t be removed from the watch housing, however, it could be lifted up enough to allow removal of the stem (& hence the clutch wheel).



Figure 14 Stem & Clutch wheel removed.

Step 10 – Remove the Canon pinion (Part# 014-108).

I did this by pulling off with tweezers (It did come off quite easily!) but it’s probably safer using some Presto watch hand pullers .

NB Be careful not to break off the second hand pinion, which you can see is very fine and fragile!



Figure 15 Canon driver removed


Now turn over movement - End of Part 1
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Old 07-23-2016, 05:51 AM   #2 (permalink)
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Very useful thanks. I have an old 52-0110 with a 8210A in poor condition that I'd like to tackle myself. I haven't seen a strip-down of a 8210, but the the process above will be very handy.

Regards,

Ross

Last edited by RossR; 07-23-2016 at 05:56 AM.
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