Husqvarna K770 Workshop Manual page 52

overview on page 13 . Before the test, turn the
crankshaft until the exhaust port is fully open. The piston
must be at its bottom turning point.
1. At the exhaust port, attach the exhaust port seal on
the cylinder by the position of the muffler.
2. At the inlet port, loosen the screws at the lower part
of the carburetor.
3. Put the inlet seal in position and put in the screw. Be
careful of the strap. Pull the lower part carefully.
52 - Repair and servicing
4. Connect the pressure tester on the nipple at the
exhaust port seal. With the pressure tester, increase
the pressure to 7 psi/0.5 bar. After 30 seconds the
pressure can drop at the most to 3 psi/0.2 bar.
5. If there is a leakage, apply a solution of soap and
water or use a leakage spray to find it.
a) Examine the seals on the crankshaft.
b) Examine around the gaskets where the
crankcase halves are joined and at the base of
the cylinder.
c) Look for cracks on the crankcase.
6.12.2 To remove the crankcase seal
To replace the crankcase seal rings, use a Husqvarna
puller and an assembly punch. See
overview on page 14 and Servicing tools overview on
page 12 .
1. Press down the puller and tighten the outer thread of
the puller in the sealing ring.
2
2. Turn the center bolt (T-handle) of the tool to pull up
the sealing.
3. Remove the seal in the same way on the flywheel
side.
Servicing tools
1
701 - 002 -