Stiga TRE 0702 - ENGINE BLOCK - External Repairs; Checking the Compression

Release 00 - 03/2018
Engine TRE 0701-TRE 0702-TRE 0801
pag. 33
Service manual
10. ENGINE BLOCK - External repairs
2
1
10.1. Checking the compression
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 4.2 Bars (60 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 [
10.2];
- cylinder head loose or cylinder head gasket worn
[
10.3].
- lack of seal in the valves [
10.4];
- piston rings worn [
10.3].
5 - Ret the spark plug (2) and close it to the indi-
cated couple.
3
4
INDEX
<< BACK >>