Repairing planned obsolescence in Toro 350 Ultra leaf blower

Toro 350 Ultra leaf blower bearing replacement

Overview of the patient on the healing bench

Crusty wiring

Thyristor control of rpm.

Insides

Motor type MAMCO ES144 CD

Getting dimensions of the rotor axle

Brush width

The rotor has already been damaged but is still working

Brush height

Piss-poor original sintered copper sleeve bearing

Luckily the original design was for a deep groove ball bearing 8x22x7 a.k.a. 608

Unfortunately the bearing position has not been finishing machined.

The machining reserves in the diameter are around 1mm.

The lip is in the righ diameter but the insides are a bit too tight

After some dremeling later the pocket is big enough to accept the 608 bearing

Beauty shot

Car troubles: Replacing the main bearing of a viscous coupled fan of a Audi A6 C4 2.5Tdi with AAT or AEL engine

Removing the viscous fan pulley 

The fan bearing is the same for the following models:
Catnr.: 183 07.96>10.97 Audi A6/S6/Avant quattro
Catnr.: 175 07.95>06.96 Audi A6/S6/Avant quattro
Catnr.: 189 07.96>10.97 Audi A6/Avant
Catnr.: 168 07.95>06.96 Audi A6/Avant
Catnr.: 154 06.94>06.95 Audi A6/Avant
Catnr.: 149 07.93>07.94 Audi 100/Avant
Catnr.: 155 06.94>06.95 Audi A6/S6/Avant quattro

This special tool is for holding the pulley stationary while opening the nut of the viscous coupling.

The special tool attaches to socket-head screws installed through the pulley.

    

In order to install the screws another special tool is needed.

Light tap with hammer loosens the fan nut.

Getting the shaft out

Here you can see the bolts installed in the pulley. Next step is to remove the hub. The hub may be removed by pushing it out with screws in the pulley installation holes.

Now you might have noticed that the hub only moves.

After removing the hub a plain shaft is revealed. A groove was ground to the shaft and another special tool was created. Tool is made from a M16 DIN 6334 extension nut by drilling and tapping M6 threads on each flat on the nut. Screws are inserted to threads and tightened against the shaft. 

This tool was used in combination with a improvised slide hammer. The hammer is made of a M16 all-tread rod and an old harmonic dampener of this engine. 

The all-thread is tightened to the extension nut by another nut to minimize backlash.

Installing the new pulley

Shame, the new machined part is 2mm too long.

Alright, so here is the link to the drawing: Drawing (Finnish)

Remember to substract 2mm from the total length of the main piece, all other spacers are unnecessary.