ENGINE
2-37
D569-W02 May-2003
569W253A
C. ENGINE BODY
a. Checking and Adjusting
1) Compression pressure
1. Run the engine until warmed up.
2. Stop the engine and remove the air cleaner, the
muffler and all nozzle holders.
3. Connect a compression tester to the nozzle holder
hole.
4. Pull the stop lever to cut the fuel and run the engine
with the starter at 250 ~ 350 rpm for 5 ~ 10 seconds.
5. Measure the maximum pressure while running, sev-
eral times.
6. If the pressure does not reach the allowable limit,
apply a small amount of oil to the cylinder wall
through the nozzle holder hole and check the pres-
sure again.
7. If the pressure raises after oil is apply, check the
cylinder wall and piston ring.
8. If the pressure is still low, check the top clearance,
valve clearance and cylinder head.
NOTE:
• Check the compression pressure with the specified
valve clearance for proper air in taking.
Compression
pressure
Difference
between two
cylinders
Factory spec.
Allowable limit
Allowable limit
3.24 ~ 3.73 MPa
33 ~ 38 kgf/cm
2
469 ~ 540 psi
2.55 MPa
26 kgf/cm
2
370 psi
10 %
www.mymowerparts.com
K&T Saw Shop 606-678-9623 or 606-561-4983
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