Valve Seat Width Check; Valve Guide Clearance Check - Husqvarna TC 449 2011 I.E. Workshop Manual

H01758
H01759
Workshop Manual Ed. 03-2012
ENGINE DISASSEMBLY/REASSEMBLY
TC 449 2011/2012 I.E.
TE 449 - 511 2011/2012 I.E.
TXC 449 - 511 2011/2012 I.E.
SMR 449 2011 I.E.
SMR 511 2011/2012 I.E.

Valve seat width check

• Check that valve seat contact surface is neither damaged nor worn.
Check
• Measure valve seat width (A) (contact surface without soot deposits).
Technical specifications
Intake valve seat width
Result: Valve seat outside tolerance values.
Action:
• Grind or replace valve seat.

Valve guide clearance check

Check
• Apply a dial gauge at right angles with valve stem, preferably close to cylinder
head bearing point.
• Measure valve clearance by moving it. Repeat this procedure by moving dial
gauge by 90° (A, B).
Technical specifications
Intake valve clearance
inside corresponding
guide
Exhaust valve
clearance inside
corresponding guide
Result: Stem clearance outside tolerance values, even with new valve.
Action:
• Replace valve guide
Check
• Check valve spring for damages and wear
Result: Worn or damaged springs
Action:
• Valve spring replacement
F1.48
New 1.3 mm
Wear limit Max. 1.95 mm
New 1.6 mm
Wear limit Max. 2.4 mm
New, with 15 mm 0.01 mm
valve lift
Wear limit, with 15 Max. 0.25 mm
mm valve lift
New, with 15 mm 0.02 mm
valve
lift
Wear limit, with 15 Max. 0.25 mm
mm valve lift