MAINTENANCE AND REPAIR INSTRUCTIONS
Checking the fuel, cleaning the air filter, and adjusting the idle
speed should solve most engine problems. If not and all of the
following are true:
3.
4.
5.
Remove the screw behind
the engine cover (Fig. 36).
Screw
Disconnect the spark plug
wire.
•
•
•
the engine will not idle
the engine hesitates or stalls on acceleration
there is a loss of engine power
Clean dirt from around the
spark plug. Remove the
spark plug from the cylinder
head by turning a 5/8 in.
socket counterclockwise.
Have the carburetor adjusted by an authorized service dealer.
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel unsure or
unqualified to perform this, take the unit to an authorized
service center.
6.
7.
Remove the engine cover.
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-
NOTE: Inspect the valve to rocker arm clearance with a feeler
gauge after the first 10 hours of operation and then every
Fig. 36
25
hours of operation thereafter.
Rocker
•
•
The engine must be cold when checking or adjusting the
valve clearance.
25
bit (Fig. 37). Remove the
Arm
rocker arm cover and gasket.
Cover
This task should be performed inside, in a clean, dust free
area.
8.
Pull the starter rope slowly to
bring the piston to the top of its
travel, (known as top dead
center). Check that:
1.
Remove the muffler cover by pressing down on it,
separating it from the engine cover. Using a flat blade
screwdriver, disengage the middle and front tabs and slots
first. The cover will hinge off from the rear tab (Fig. 34).
Spark
Plug
Hole
•
•
The piston is at the top of its
travel while looking in the
spark plug hole (Fig. 37)
Both rocker arms move
freely, and both valves are
closed
Fig. 37
If these statements are not true, repeat this step.
9.
Slide the feeler gauge between the rocker arm and the
valve return spring. Measure the clearance between the
valve stem and rocker arm (Fig. 38). Measure both the
intake and exhaust valves.
Engine Cover
Rear Slot
and Tab
Adjusting Nuts
Rocker Arms
INTAKE
Middle Tab
Middle Slot
Front Tab
Front Slot
EXHAUST
Fig. 34
Feeler Gauge
2.
Remove the two (2) screws on top of the engine cover with a
Flat-head or T-25 Torx screwdriver (Fig. 35).
Top View Of The Engine
Remove
Screws
Engine Cover
Fig. 38
The recommended clearance for both intake and exhaust is
.003
.005
– .006 in. (.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 Figures 38 and 39.
10.
If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or
nut driver (Fig. 39).
•
To increase clearance, turn the adjusting nut
counterclockwise.
Muffler
Fig. 35
11
| Categories | Lawn Mower Manual, MTD Lawn Mower Manuals, Troy-Bilt Lawn Mower Manuals |
|---|---|
| Tags | MTD TB26TB, Troy-Bilt TB26TB |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | MTD, Lawn Mower |
| Document File Type | |
| Publisher | mtdproducts.com |
| Wikipedia's Page | MTD Products |
| Copyright | Attribution Non-commercial |
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