Husqvarna 340, 345, 346XP,350, 351, 353 manual Repairing damaged threads, Thread insert

Repair instructions

Repairing damaged threads

A repair kit, 503 27 33-01, is available for repairing damaged threads.

First drill out the hole using:

6.1mm drill bit for magnesium crankcase

Then screw in the thread insert using a suitable bolt and spanner.

Thread insert

A damaged thread can be repaired using a thread insert. The slotted part of the thread insert is screwed in first, as this is the cutting part.

To repair a thread that was originally designed for a PL5 screw: first drill out with a 6.1 mm diameter drill bit, then screw in the thread insert using a suitable screw and spanner.

To repair a thread that was originally designed for a MT6 screw: first drill out with a 7.1 mm diameter drill bit, then screw in the thread insert using a suitable screw and spanner.

This type of thread insert is best suited for use in plastic and magnesium, but not for repairing threads in aluminium. In that case use a helicoil insert with metric screw.

New part no.	Description
503 27 39-01	PL5
503 27 40-01	MT6

Guide bar bolts – replacement

1

Drain the oil tank.

2

Knock through the old guide bar bolt so that it falls into the oil tank.

3

Remove the bolt from the oil tank.

4

Fasten a steel wire to the thread of the new bolt, feed the steel wire into the oil tank and out through the bolt hole in the crankcase.

5

Pull the steel wire until the bolt comes out through its hole.

6

Pull through the bolt with its nut. Place a spacer between the nut and crankcase.

7

Check that the square shoulder of the bolt is correctly seated in the recess in the crankcase.

8

Refill with chain oil.

English – 49