Camshaft; Timing Chain And Gears; Timing Chain Tensioners - Husqvarna TC 250 2010 Workshop Manual

ENGINE OVERHAUL

Camshaft

Check the contact faces of the lobes for streaks, scoring, dents and waviness.
Clamp the camshaft between centres and check deviation using two dial gauges.
Service limit: 0.1 mm. Check that the lobes are in pristine conditions, without
signs of scoring or distortion.

Timing chain and gears

At each engine overhaul, check gear teeth and chain rollers for wear. If gear
teeth are badly worn, change both gears and the chain. Hold the chain taut to
take out any slack and measure across 20 links (21 pins).
If any one gear or the chain is worn beyond the specified limit, replace both
gears and the chain as a set.
STANDARD "L"
140 mm
(5.51 in)

Timing chain tensioners

Chain tensioners (1) must be replaced when the wear material is worn out.
G.10
SERVICE LIMIT
142.5 mm
(5.61 in)
Part. N. 8000 H1489 (10-2009)