impeller fan touching

jlee · 17 Oct 2015

Folks,

appears my impeller fan is sometimes hitting the shroud and makes a squealing sound sometimes.

Questions:

1. what is causing this?

2. is it a tensioning problem and easy fix of some bearings / alignment

3. The fan and shorud are exposed to air now coating is off. are they compromoised for corrsosion of these alloy / magnesium parts.

Not sure what they are made of but read they were magneium and dont take kindly to air once exposed. Can i powder coat and save them ?

Chief · 17 Oct 2015

That doesn't look good to me. Looks like the tension on the belts is pulling the fan down. I would guess this is play in the nose bearing. It needs looking at ASAP! I have seen the devistation when a fan lets go

I would also check the blades for cracks whilst apart as they have been touching the shroud. If they look fine you can paint/ powder coat as part of the project. :thumb:

Zingari · 17 Oct 2015

Bearing is a simple fix with the right tools and can be obtained from OPC :thumb:

This DIY is about changing belts on a 993 but same principles: http://p-car.com/diy/vbelt/

Try pressing the fan blades in at various points to see if there is any 'rocking' on the central shaft as this is usually a sign of bearing wear. As Chief says sort it asap if the blades break, off devastation and the magnesium fan aint cheap.

Get it out and paint to taste :grin:

AVI_8 · 17 Oct 2015

Hi, totally agree with the above advice, though free play in the bearing might not be obviously felt until the the tension is released from the belts, Personally I wouldn't start the engine until the problem is fixed. Bearing replacement shouldn't be too costly, fan destruction because of contact with the shroud would cost a lot more.

jlee · 19 Oct 2015

thanks folks.

How much is the bearing and sort of hours labour cost for this job?

Zingari · 19 Oct 2015

jlee said:
thanks folks.

How much is the bearing and sort of hours labour cost for this job?

I think it's c£10 (give OPC a call) and most likley an hours labour but you'll want to powder coat the fan so probably best if you can arrange for this to be done at the same time :thumb:

This is the bearing I needed but some say there is another type :dont know: Mine had to be couriered from Stuttgart :what:

g60pops · 19 Oct 2015

Whilst you are in there change the voltage regulator at the back of the alternator. Cheapest I found was from Fraser parts.

Zingari · 19 Oct 2015

g60pops said:
Whilst you are in there change the voltage regulator at the back of the alternator. Cheapest I found was from Fraser parts.

Indeed. I did exactly that and got it from them :thumb:

-Teme- · 19 Oct 2015

jlee said:
thanks folks.

How much is the bearing and sort of hours labour cost for this job?

A genuine Porsche part is £100+: http://www.design911.co.uk/fu/prod10939/Alternator-Bearing-Fan-Blade-Porsche-964---993-96410605130/

My OPC quoted 2 hours labour. Change the belts as well since they are cheap.

Zingari · 19 Oct 2015

-Teme- said:
A genuine Porsche part is £100+: http://www.design911.co.uk/fu/prod10939/Alternator-Bearing-Fan-Blade-Porsche-964---993-96410605130/

My OPC quoted 2 hours labour. Change the belts as well since they are cheap.

Ah yes that's the 'full' part. Obviously the bit I had is the insert which can be sourced quite cheap. In fact the 'bearing' issue started two days before I was due to drive to Spa and I couldn't get the part quick enough so the track day was canned. I then found out that 9M had plenty of them in their workshop and they could have helped me out being only 20mins away

c:

impeller fan touching

jlee

Monza

Attachments

Chief

Singapore

Zingari

Brands Hatch

AVI_8

Monza

jlee

Monza

Zingari

Brands Hatch

g60pops

Spa-Francorchamps

Zingari

Brands Hatch

-Teme-

New member

Zingari

Brands Hatch

Similar threads

Latest posts

New Threads

Porsche Model Range

Porsche 911

Porsche Hypercars

Other Current Porsche Model

Porsche Legacy Models

Forum statistics