Generator Shims
-
- 356 Fan
- Posts: 1122
- Joined: Wed Apr 02, 2008 9:49 pm
- Location: Gilroy, CA
Generator Shims
Question: what is correct OD of the shims to be used on the pulley end? I had two generators to change. My friends 58 Cab had a VW generator that the bearings were shot on. and, My 59 coupe had a 160 watt generator and I wanted to replace it with a fresh 200 watt. Since both cars were being done one after the other I made notes of what was different. Mostly the collection of shims for setting the pulley spacing. I laid out all of the different shims and took this photo, I have 40mm OD, 42mm OD with two holes, 42.5mm OD, and 46mm OD. Then for the fan end, (the same for both cars) a thick 46mm OD with squared inside, a thin 47mm w/round hole, and 46mm wavy washer. Neither car had all 10 shims with the same OD. I found 20 of the 40mm OD shims and assembled both with those. But have about 49 more of the various sizes. Since I have changed generators on 30-36hp VWs as well as a few 356s it could be a mix from those.
- Attachments
-
- IMG_4645.jpeg (4.3 MiB) Viewed 1206 times
- David Jones
- Classifieds Moderator
- Posts: 7341
- Joined: Tue Mar 25, 2008 6:32 pm
- Tag: I wish I knew as much as I think I know.
- Location: Kentucky
Re: Generator Shims
I doubt the generator cares about the OD just use 10 and get the alignment and tension correct.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
David Jones #9715
Cymru am byth
David Jones #9715
-
- 356 Fan
- Posts: 1122
- Joined: Wed Apr 02, 2008 9:49 pm
- Location: Gilroy, CA
Re: Generator Shims
David, I think you are right. The larger diameter shims, 46mm, might give more support to the pulley halves. But, I only had 9 of those in my collection . 4mm isn't all that much more. Could the belt actually ride on the larger shims?
- Ron LaDow
- 356 Fan
- Posts: 8092
- Joined: Wed Mar 26, 2008 11:45 am
- Location: San Francisco
Re: Generator Shims
Don't have a generator pulley in front of me, but don't the inner halves have a recess for the shims?
If so, it'll tell you the max OD.
If so, it'll tell you the max OD.
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
- David Jones
- Classifieds Moderator
- Posts: 7341
- Joined: Tue Mar 25, 2008 6:32 pm
- Tag: I wish I knew as much as I think I know.
- Location: Kentucky
Re: Generator Shims
No recess for the shims they have to sit there all day. No way the belt could get near the shims as they are well inside the Vee of the flange where the belt sits. Are you thinking of a recess between the inner half and the generator collet Ron as that is where you may add a shim to move the pulley out to perhaps correct a misalignment.
If I had known I would live this long I would have pushed the envelope a little harder.
Cymru am byth
David Jones #9715
Cymru am byth
David Jones #9715
-
- 356 Fan
- Posts: 1122
- Joined: Wed Apr 02, 2008 9:49 pm
- Location: Gilroy, CA
Re: Generator Shims
Ron, I went out and measured the recessed areas of the inner and outer pulley halves. The inner half has the recess that fits the hub, and it's 44mm ID. The other half has a recess for the shims on the outside and is 47-48mm, so any shim that I have with the square hole will fit.
-
- 356 Fan
- Posts: 72
- Joined: Wed Apr 23, 2008 12:02 am
- Location: CO
Re: Generator Shims
My 2 piece case 1500S engine 40015 has generator shims 45mm diameter x 1.5 mm (8) and one 45mm x 1.0 mm shim.
David Seeland
-
- 356 Fan
- Posts: 1122
- Joined: Wed Apr 02, 2008 9:49 pm
- Location: Gilroy, CA
Re: Generator Shims
Hi Dave, haven't seen you posting for a long time, good to know you are still around. I think the larger shims 45-46mm were from some of my 30-36hp VWs, not sure where the one with the 2 holes came from.
- Al Zim
- 356 Fan
- Posts: 4356
- Joined: Thu Mar 27, 2008 12:37 pm
- Location: FT.WORTH/DALLAS TEXAS
- Contact:
Re: Generator Shims
WATCH YOURSELF! Why would someone make a shim that is larger in diameter than the factory shim? We know the factory shim worked on thousands of Porsche's and hundred's of thousands of VW. It is my guess that someone found a cheap circular piece of metal the thickness of the Porsche/VW shim and all they had to do was cut the hole in the middle. Each of your other larger shims are used on the fan end of the generator. 75 Foot Pounds of torque is the requirement for the fan nut. al zim *** A quick look at the inner pulley (facing the front of the car) reveals it needs to be replaced. Sorry I missed that before.
Last edited by Al Zim on Sun Aug 16, 2020 3:15 pm, edited 1 time in total.
www.allzim.com
356 Parts and Services
www.facebook.com/ZimsAuto/
www.instagram.com/zims_autotechnik/
356 Parts and Services
www.facebook.com/ZimsAuto/
www.instagram.com/zims_autotechnik/
- Dennis Vogel
- 356 Fan
- Posts: 505
- Joined: Sat Oct 25, 2008 6:10 pm
- Location: Santa Rosa, CA
- Contact:
Re: Generator Shims
What is the correct thickness of shims? Like Steve, I had some with different outside diameters and also different thickness:
- Thickness x OD (mm)
- .75 x 40
- 3.6 x 42
- 2 x 45
- 1.5 x 45
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
- Dennis Vogel
- 356 Fan
- Posts: 505
- Joined: Sat Oct 25, 2008 6:10 pm
- Location: Santa Rosa, CA
- Contact:
Re: Generator Shims
I purchased 539.09.314 from Sierra Madre. It is roughly 40mm OD and .70 thick.
1960 356 S90 Sunroof Coupe
1970 914-6
2014 Carrera S
1970 914-6
2014 Carrera S
- James Davies
- 356Talk Moderator
- Posts: 2959
- Joined: Thu Aug 15, 2013 9:15 am
- Location: Heidelberg, DE
Re: Generator Shims
To hopefully clarify some confusion here, the early Porsche pulley for the 2-piece case motors had a larger diameter for the generator pulley, which means it likely used the larger ~45mm shims. The smaller generator pulleys for the 3-piece cases likely use the smaller diameter shims.
The VW engines from 1950 to 1960 used a small diameter generator pulley as well, so doubtful it used the 45mm versions, though possible.
The large-diameter gen pulley was unique to Porsche 2-piece case motors.. Photo of it below.
The VW engines from 1950 to 1960 used a small diameter generator pulley as well, so doubtful it used the 45mm versions, though possible.
The large-diameter gen pulley was unique to Porsche 2-piece case motors.. Photo of it below.
- Paul Hatfield
- 356 Registry Member
- Posts: 1149
- Joined: Tue Mar 25, 2008 5:46 pm
- Location: Washington State
- Contact:
Re: Generator Shims
2-piece engine case pully: Yup, larger and it used a different generator/fan belt than the 3-piece engines. I still have a few that I made.....
Paul Hatfield
"Miss April"
http://www.enginesinback.com
"Miss April"
http://www.enginesinback.com