geolab

How to Remove Crank Pulley and/or Engine Fan with Engine in Car DIY
To remove Crank pulley:

I used :
- An adjustable oil filter wrench for trucks. The particular wrench I used is made
by Facom and exists in two versions, one for cars and other for trucks.
The 993 pulley has two radius that we need to block the wrench at.
outer diameter is 15 cms, and central diameter big, is 16 cms,
so make sure the oil filter wrench covers at least the 15cms span.
- A 19mm offset boxed end wrench
- insulated 10 cms philips screw driver
- cloth, old t-shirt etc
and an extra Hand is better.

1- After removing the AC Belt, introduce the insulated screw-driver in the fan openings, and let the screw-driver
go all the way into the openings of the alternator. No need to force, just go gently.
if the screwdriver blocks, just place the cotton rag on the fan, and rotate fan a few dgrees for the screwdriver to go in as in picture.
2- Unscrew the alternator shaft with a 24 mm wrench, with the other hand holding the screwdriver. You will notice that the axle bolt will loosen without hard force, no harm to the alternator whatsoever.

geolab

step 2:
-Remove all fan pulleys and belts.
-Now is the time to introduce the old T-shirt under the pulley
- Introduce the oil filter wrench around the outter part of the pulley, and tighten the oil filter wrench
positioning its handle at 2 oclock or lower, as much as you can go
- Introduce the 19mm offset boxed end wrench into the Crank Pulley bolt
-let someone hold the oil-Filter Wrench pushing down, and with huge gloves (taking care not to bruise yourself) un-tighten the Crank Pulley Bolt, it will let go.
-remove the bolt totally, and retrieve the Pulley, it will look like this:

geolab

in putting all back together, I always purchase a new pulley bolt for the pulley, and bolt comes with the loctite green stuff on it from porsche already
Even if you decide to go the hard way and remove everything , lower the engine to access the pulley,
I would personnaly NEVER use a rattle gun, think about your timing chains.
The timing of the 993 is already delicate, you would not want to weaken your chains

geolab

as I do to remove the fan from alternator axle whilst in car without jaw-puller etc
I remove all bolts holding fan to hub, and introduce same size 10cms longer bolts into the three holes
and tighten, making sure the long bolts land on the covered metal of the alternator, in the back
of the fan.
Then you tighten a turn for each bolt clockwise, and you pass to the other bolt,
your fan will start sliding out on the axle, until it goes out
voila

AOW162435

George,
Wonderful writeup - thank you for your efforts.


Andreas

Slow Guy

Yes, thanks George!
Can't say I've ever seen an oil filter wrench like that but it looks like it would work well.

geolab

thanks A and B. In fact, the first time I used this filter wrench was to block
the A/C compressor clutch, and be able to unbolt and refresh with black Matt paint
does the job very well.

Gunter

Very nice!

What size is the pulley bolt and recommended torque?

On my old 911 SC, the bolt is M12 x 1.5 mm and torque 129 ft-lbs if the pulley also drives A/C.

geolab

thread size is M14 x 1.5 , and as above picture, key hex size is 19 mm, torque 120

MDamen

What is the screwdriver blocking against inside the fan housing? Is there a reason you used this method instead of using the 12 point wrench on the alternator shaft? By using the screwdriver you don't have to have the special tool and you don't risk rounding the hole in the shaft. This is a good backup method in case someone does mess up their alternator shaft.

Luftd993

Good information as always George. Thanks for posting.
That fan housing looks nice.
I must admit I chickened out of using that screwdriver method when I changed my belts recently. I threw out the Porsche tool and bought a snap-on

Quadcammer

using the screwdriver method works fine.

geolab

thanks all
It is by necessity that I found this solution
the exact screwdriver you see in the picture, does not have a metal head prancing anymore. Ground this one off, and pulled isolating rubber over it.
I keep it just for this.
I have the porsche special tool with the porsche sticker still on it in my tool truss.
Rounded the hole in the shaft once, changed the alternator because of that, never again.

Gunter

Good point about the possibility of rounding the internal 12 point hole when considering the size of the nut vs. the size of the 12 point tool.

Clarification, please.

When the Phillips insulated screwdriver is inserted into the fan as shown in the picture, where inside does the tip of the screwdriver rest to lock the fan?

10 cm (4") #2 Phillips?

Thank you.

P-daddy

Noob question:
After removing the 19mm nut on the alt shaft, do the pulleys and belts just slide out easily? Are the belts under tension? Thanks