Ch 044 / 38
Step 04.4 — Heat-set one insert into each tension arm¶
Step 4 of 38 · Chapter 04 — A/B drive units and front idlers
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Parts:
- M3×5×4 brass heat-set insert ×2 · Fasteners, Tools & Misc box
-
[a]_tensioner_left×1 · bin 04-B -
[a]_tensioner_right×1 · bin 04-A - soldering iron with the M3 insert tip · tool
Do: Each tension arm has one through-bore stepping from 3.5 mm to 4.7 mm. Press the insert into the 4.7 mm end, the wider opening. The 3.5 mm section is the M3×40's clearance and must stay clear.
Check
Pushed in by hand from the plain 3.5 mm end, an M3×40 SHCS runs free and picks up thread only at the insert.
What you're looking at
Manual p.64 and the two blue tension arms: levers carrying each front idler's bearing stack, drawn forward to tension a belt. Each is a C: top boss counterbored for the M5×40 head, foot with the M5 nut pocket, back wall with one stepped bore.