Stiga WBE170 - 15 ENGINE BLOCK - External Operations; Checking the Heating Unit Seal

Release 00 - 11/2018
Engine WBE 170
page 39
Workshop Manual
15. ENGINE BLOCK - External operations
21
15.1. Checking the heating unit seal
1 - Remove the cap (1) and take out the spark
plug (2).
2 - Manually set the piston to the TDC (Top Dead
Centre) of the compression stroke so that both
valves are closed.
3 -
Screw the terminal of the compression te-
sting tool (3) into the spark plug hole and connect
the supply pipe to a compressed air socket with a
pressure of approximately 4 bar (58 psi).
4 - On opening the air tap (4), the manometer
gauge on the engine side should position itself in
the green zone and remain there for about 30 se-
conds. If the gauge falls rapidly it means that the
compression is poor.
NOTE: Lack of compression could be due to:
- incorrect valve clearance [
15.2];
- lack of seal in the valves [
16.4];
- piston rings worn [
16.3].
5 - Ret the spark plug (2) and close it to the indi-
cated couple.
3
4
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