3300 Rotor replacement

[compsci]

In the U.S. we have been told that the original rotors are no longer available. The new replacement rotors are too loose and are unacceptable. Is this a known problem and if so is there a known solution?

 

 

[facthunter]

If they are loose they fret and fail. A carefully fitted shim may work It can't go anywhere once it is in place especially with something like loctite. There may be some information from jabiru on this Nev

 

 

[cosmicray]

In the U.S. we have been told that the original rotors are no longer available. The new replacement rotors are too loose and are unacceptable. Is this a known problem and if so is there a known solution?

The following information came from a Yahoo Jabiru group some years ago. Don't know how relevant it is today or to your problem but it may help knowing some history.

 

Jaba Chat newsletter August 2001 first mentioned the epoxy and cotton flock

 

attachment of distributor rotors:

 

 

 

"Because of backlashing of gears, vibrations reflect back to the rotor causing a

 

slow wear of the rotor shaft and spring to distributor shaft. Inspection of

 

these is a must at least every 50 hours. Believe it or not, some 5 minute epoxy

 

araldite and flock applied to the inside of the rotor when assembled to the

 

distributor shaft will cause it to remain rock hard forever. To remove,

 

carefully pry off. A rotor which is moving inside supplying spark to the plugs

 

is not a good idea."

 

 

 

I suspect it has been mentioned since then too, but the info had not altered

 

it's basic idea.

 

 

 

"Cotton flock" is a fibre material, not a powder. Any good fiberglassing supply

 

should have some, but you probably have to buy a bag of it, which would last

 

456,765 rotors. But it should be inexpensive. It's used for all manner of

 

fiberglassing jobs - making strong fillets, joining parts in molds and so on.

 

Perhaps check the West System catalogue for it. I got mine (not West) 15+ years

 

ago, and still have the same bag of it.

 

 

[Gnarly Gnu]

"Cotton flock" is a fibre material, not a powder. Any good fiberglassing supplyshould have some, but you probably have to buy a bag of it, which would last

456,765 rotors.

I have a heap of nylon flock at work if anyone wants any (assuming nylon would work). I have a flocking machine too, a big box thing that cranks out about 70,000 volts (made in China to no regulations which makes me worry about the insulation quality at times). Or you might be able to get little bits of the flock material from some craft suppliers.

 

 

[compsci]

Thank you for your responses. However, the new rotor replacement (in the U.S.) are of poorer quality than the GB73 Bosch rotor.

 

I may have been able to order the Bosch rotor from an Australian company. My question: is there a good replacement for the Bosch GB73? rotors?

 

 

[facthunter]

I haven't found anything that is better quality. I'll check if the one you want is available.

 

I can get at least 5 straight away. they fit a range of cars around 1970 on. My source says they are made in germany. Suggest you make enquiries there, and let me know if there is a problem of continued supply Nev

 

 

[jetjr]

The loose rotors was an early problem, could resurface with new manufacturer

 

Using Araldite (epoxy) has been practice since then...... 6-7 years?

 

They are Ok for a start but loosen quickly