Woodruff Key for 914-6 Bosch Generator Options

[DennisV]

Can someone tell me what the correct part number / size is for the woodruff key used to secure the fan to a 914-6 Bosch 770W generator? The part is not identified in the catalog.

I had information suggesting it was N-012-710-1 4 x 6.5 mm for '65-77 911. I have tried to install the Porsche supplied part a few times and it is certainly too tall.

None of the alternates I find from the normal suppliers list this use for their woodruff key offerings. Trying to measure the opening in the shaft and the fan, my best guess is it wants 4 x 5.

Thank you.

[Superhawk996]

The key is shown in PET. You have the correct part number.

The enshitification of global supply chains virtually ensures nothing fits properly anymore.

Woodruff keys rarely ever fit perfectly even back in the good ol’ days.

Modify it accordingly. The most important dimension(s) is the width and the radius of the semi-circular side that engages the shaft and that it fits snugly into the groove without side to side wobble.

Use a file for non-critical dimensions like height. Sandpaper and a flat surface for the critical dimensions to fine tune the fit.

[914Wes]

You may try looking for the old part numbers 90011800600, or N-012-710-2. Everything listed by Superhawk996 is correct.

[Superhawk996]

Ah - I see what your saying now - key not shown for 914/6 PET

Anyway - this is where you just jump over to the 911 PET . . . That’s where I went first.

[mepstein]

(IMG:style_emoticons/default/agree.gif) Sometimes you just have to customize the woodruff key to make it fit correctly.

[DennisV]

The key is shown in PET. You have the correct part number.

The enshitification of global supply chains virtually ensures nothing fits properly anymore.

Woodruff keys rarely ever fit perfectly even back in the good ol’ days.

Thanks for the confirmation on the part number. I should have specified that I've been looking at the PDF parts catalog. The woodruff key isn't even shown in the drawing.

Thanks for the levity on proper fitment.

[sixnotfour]

Here is a double check..
Bosch 914-6 alt.. Key that was in it..
height ,,flat to radius= 4.93 mm
length,,point to point= 12.45 mm
width,, = 3.98 mm

[sixnotfour]

https://www.harborfreight.com/search?q=metr...odfuf%20%20keys

[bdstone914]

Mcmaster.com
Has German made keys that have the correct dimensions. You get 25 for $10.
My alternator rebuilder who has been rebuilding them for 35 years does not use them and says the pulley will not slip on the shaft without the key.

[914Sixer]

I have some NOS 914-4 ones. Have to check size

[porschetub]

Mcmaster.com
Has German made keys that have the correct dimensions. You get 25 for $10.
My alternator rebuilder who has been rebuilding them for 35 years does not use them and says the pulley will not slip on the shaft without the key.

Would certainly use the key..it's there for a reason .just saying ,cheers.

[DennisV]

Here is a double check..
Bosch 914-6 alt.. Key that was in it..
height ,,flat to radius= 4.93 mm
length,,point to point= 12.45 mm
width,, = 3.98 mm

Thanks for this datapoint. It aligns with what I measured in the shaft and fan hub.

I may regret it later, but I bought the assortment from Harbor Freight. The 4 x 5 went in like I expected. Progress...

[sixnotfour]

Here is a double check..
Bosch 914-6 alt.. Key that was in it..
height ,,flat to radius= 4.93 mm
length,,point to point= 12.45 mm
width,, = 3.98 mm

Thanks for this datapoint. It aligns with what I measured in the shaft and fan hub.

I may regret it later, but I bought the assortment from Harbor Freight. The 4 x 5 went in like I expected. Progress...

Make sure its GutenTight,, haha no matter , Its better than not having one.. And fit your time frame JIT. (IMG:style_emoticons/default/popcorn[1].gif) (IMG:style_emoticons/default/driving.gif)