Technical Information · issue 30 of 2004
Cylinder mounting; (crankcase, cylinder, screws)
IssueTI 30/2004
Engine family 1128
Part changes (1)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 9022 371 1020 | 9022 371 1050 | Screws Cylinder The old screw M5x20 (9022 371 1020) is replaced by the version M5x25 (9022 371 1050). |
Full text
Page 1 of 3
STIH)
Technical Information 30.2004
Chainsaw STIHL MS 440 – Series 1128
Cylinder mounting
(crankcase, cylinder, screws)
As of Machine No. 1 62 936 786, the crankcase
halves and the screws used for mounting the
cylinder are changed in order to improve the screw
connection between the crankcase and the cylinder.
Crankcase
Longer threaded inserts are used on the two halves
of the crankcase. In future, the cylinder will be
secured to the crankcase with screws (M5x25)
which are 0.197 in (5 mm) longer than the present
screws.
Left: old threaded insert
Right: longer threaded inserts in the crankcase
Spare parts
The part number of the crankcase remains
unchanged.
TI_30_2004_30_01_01.fm englisch / English USA
)m~ge 2 Technical Information 30.2004
Screws Cylinder
The old screw M5x20 (9022 371 1020) is replaced
by the version M5x25 (9022 371 1050).
Spare parts
The old screw M5x20 remains available for use in
crankcases with short threaded inserts.
Repair note
The new, 0.197 in (5 mm) longer screw M5x25 may
be used only together with the longer threaded
inserts.
The longer screw M5x25 cannot be used on
cylinders with ribs (a).
The longer screw M5x25 can be used on cylinders
without ribs (b).
If, during repairs, a new crankcase (with loner
threaded inserts; see "Repair note") is combined
with a cylinder with ribs (a), the shorter screws
M5x20 must be used.
In order to ensure uniform thermal expansion, the
cylinder must always be secured with four screws of
the same length.
When servicing the saw, only the following
combinations of crankcase and screws are
permitted:
a = 0.472 ± 0.020 in M5x20
(12 ± 0.5 mm) 9022 371 1020
a = 0.669 ± 0.020 in M5x25
(17 ± 0.5 mm 9022 371 1050
The tightening torque remains unchanged at
102 lbf in (11.5 Nm).
TI_30_2004_30_01_01.fm Page 2 of 3
Technical Information 30.2004 Page 3
Summary
Item Part name Previous New Remark
Screw M5x20 9022 371 1020 --- 1)
Screw M5x25 --- 9022 371 1050
All other parts unchanged
Modification introduced with Machine No.: 1 62 936 786
Remark
1) Previous version of part remains available for older machines
Last Technical Information on the STIHL MS 440: 39.2003
© ANDREAS STIHL AG & Co. KG, 2004 Technical Documentation
D1/MTK-bl
TI_30_2004_30_01_01.fm Page 3 of 3
Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.