DLR 2007-02 New Special Tools ea 2012.doc
Page 1 of 9
New STIHL Engine Repair Tool Kit part number 5910 890 1700
The new STIHL Engine Repair Kit includes tools to
inspect and clean the cylinder components of all 2-
stroke and 4-stroke cycle engines.
Components included in tool kit:
The main components of the kit include
various abrasive pads for cleaning gasket
surfaces, combustion chambers, valve seats,
and exhaust ports. A cylinder leak-down tester
is also included for checking exhaust and
intake valve sealing on all 4-stroke cycle
engines and also can be used to check piston
ring sealing and piston damage on all 2-stroke
cycle engines. Other useful tools are included
that are further explained in this bulletin. All of
the tools included in the kit are also available
separately (see summary on page 9).
When performing a cylinder leak down test
the flywheel must be blocked at TDC (top
dead center) to avoid rotation of the
crankshaft as high pressure air is introduced
into the cylinder. When using on 4-stroke
cycle engines, the piston should be at TDC
on the compression stroke with both valves
closed.
To use the cylinder leak down tester on
STIHL 4-Stroke
engines, remove the valve
cover and index the crankshaft as pictured
below. Verify that the piston is at TDC on the
compression stroke and both intake and
exhaust valves are closed.
BR 500, BR 550, BR 600
STIHL Incorporated
Bulletin #DLR 2007-02
August 2, 2007
STIHL Incorporated
Technical Information
