Type 4 Engine V-Belt Info |
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Type 4 Engine V-Belt Info |
McMark |
Jul 2 2017, 08:03 AM
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#1
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I've always found that the V-Belts (alternator belt) that you get handed when you walk into a part store isn't quite right most times. So since I needed to find a shorter version for one of my high-amp alternator installs I figured now was a great time to finally do the research and find out what the RIGHT belt is.
Here's the final specs, which I'll update if more info comes to light: Belt Angle: 36° Belt Length: 965mm Top Width: 9.5mm My Selection based on the numbers is the ContiTech Brand. Actual installation experience to follow... And here's my methodology: First I grabbed an alternator pulley off the shelf and measured the V groove directly. This isn't particularly easy because the groove is so small, but I measured 34° (note there is a margin of error here). Belt length is farily easy based on a couple sources. The 914 PET didn't list a belt for the 4 cyl (that I could find) but I happened to have a car with a very original looking belt. VW logo and everything. It lists the length as 965mm. Also looking up the VW part number on that belt comes back with a 965mm belt length. I used a belt length calculator and entered measurements from a stock fan/alternator setup and also arrived at 960mm. Top Width is listed on my presumed-OE belt as 9.5mm. I had a 11mm top width belt here and it stands up out of the groove too much. What's Available Here's the belts I looked up for a 73 914 2.0, in a spreadsheet. I would love to add more listings to this file if you have any. Attached image(s) |
76-914 |
Jul 2 2017, 10:24 AM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,509 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Ahah! I wondered why I felt a ridge across the belt and the pulley itself. Good info, Mark! (IMG:style_emoticons/default/beerchug.gif)
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bdstone914 |
Jul 2 2017, 03:03 PM
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#3
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bdstone914 Group: Members Posts: 4,537 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
I will ship ContiTech belts for free to the first 5 people who can commit to installing them the day they arrive at their home and report back here with their experience so we can finalize this project. PET list a different part number 068 903 137D which is 10 x 965 Illustration 902-05 position 3 for the 914, but the same part number for a 912E is 960 x 9. Illustration 902-10, catalog 911 1974- 1977 no position (IMG:style_emoticons/default/wacko.gif) |
iankarr |
Jul 16 2017, 06:09 PM
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#4
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,481 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region |
Hi Mark,
I finally pulled the alternator and replaced the pulley. I need a new belt and am happy to help with this project. PM me and I'll send you my address... |
peteyd |
Jul 16 2017, 07:26 PM
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#5
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Senior Member Group: Members Posts: 707 Joined: 27-March 08 From: Elora, Ontario, Canada Member No.: 8,858 Region Association: Canada |
Your'e the man Mark!
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jim_hoyland |
Jul 16 2017, 08:18 PM
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#6
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Get that VIN ? Group: Members Posts: 9,319 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Same belt used on the BNW E 30's ?
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porschetub |
Jul 16 2017, 08:56 PM
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#7
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
9.5mm is common on many german cars ,many use the 10mm but it isn't right,it won't fit down low enough and wears its way in until it becomes loose,@ the same time it polishs the pulleys so the belt will slip or chirp after being re-adjusted....seen it SO many times.
Most people overtighten belts cause they can't be bothered finding the correct tension,Marks comment about pulley angle was 36degrees...not sure but remember 35 off the top of my head...anyway. IMO any belt running over pulley o.d. is just not doing the whole job. |
rfinegan |
Jul 17 2017, 04:22 AM
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#8
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Senior Member Group: Members Posts: 973 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region |
I have a stock 75 2.0 daily drive I can test on...PM if I can help
-Robert |
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