MAINTENANCE AND REPAIR INSTRUCTIONS
2.
Remove the screw behind the engine cover (Fig. 24).
8.
Slide the feeler gauge between the rocker arm and the
valve return spring. Measure the clearance between the
valve stem and rocker arm. Measure both the intake and
exhaust valves (Fig. 26 & 27).
Screw
Adjusting Nut
Rocker Arm
0.003–0.006
in.
(0.076–0.152
mm)
Fig. 24
3.
4.
Disconnect the spark plug wire.
Clean dirt from around the spark plug. Remove the spark
plug from the cylinder head by turning it counterclockwise
with a 5/8” socket.
Intake Valve
Stem
Feeler Gauge
5.
NOTE: To ease engine cover removal, pull the starter rope out
Remove the engine cover.
Dégagement
d'admission:
.076–0.152 mm
(.003–.006 in.)
Exhaust Valve
Stem
a little to give some slack.
6.
Clean dirt from around the rocker arm cover. Remove the
screw holding the rocker arm cover with a large flat blade
screwdriver or Torx T-25 bit (Fig. 25). Remove the rocker
arm cover and gasket.
Fig. 27
The recommended clearance for both intake and exhaust is
0.003
0.005
– 0.006 in. (0.076 – 0.152 mm). Use a standard automotive
in. (0.127 mm) feeler gauge. The feeler gauge should slide
between the rocker arm and valve stem with a slight amount of
resistance, without binding. See Figure 26 and 27.
Rocker Arm Cover
9.
If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or
nut driver (Fig. 27).
•
To increase clearance, turn the adjusting nut
counterclockwise.
Gasket
Spark Plug Hole
• To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances, and adjust as necessary.
10.
11.
12.
Reinstall the rocker arm cover using a new gasket. Torque
the screw to 20–30 in•lb (2.2–3.4 N•m).
Reinstall the engine cover. Check alignment of the cover
before tightening the screws. Tighten screws.
Check the spark plug and reinstall. See Replacing the
Spark Plug.
Fig. 25
7.
Pull the starter rope slowly to bring the piston to the top of its
travel, (known as top dead center). Check that:
13. Replace the spark plug wire.
•
The piston is at the top of its travel while looking in the
spark plug hole (Fig. 26)
•
Both rocker arms move freely, and both valves are closed
If these statements are not true, repeat this step.
Adjusting Nuts
Rocker Arms
INTAKE
EXHAUST
Feeler Gauge
Fig. 26
13
| Categories | Lawn Mower Manual, MTD Lawn Mower Manuals, Troy-Bilt Lawn Mower Manuals |
|---|---|
| Tags | MTD TB144, Troy-Bilt TB144 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | MTD, Lawn Mower |
| Product Type | Walk Behind Mower |
| Document File Type | |
| Publisher | mtdproducts.com |
| Wikipedia's Page | MTD Products |
| Copyright | Attribution Non-commercial |
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