Cub Cadet 8454 Service Manual page 59

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.
Compression Factory spec.
pressure
Allowable limit
Difference Allowable limit
between two
cylinders
NOTE:
• Check the compression pressure with the specified
valve clearance for proper air in taking.
D569-W02 May-2003
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
3.24 ~ 3.73 MPa
2
33 ~ 38 kgf/cm
469 ~ 540 psi
2.55 MPa
2
26 kgf/cm
370 psi
10 %
ENGINE
569W253A
2-37