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Old 03-07-2010, 01:53 AM   #1
NT38
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Default V BELTS WHERE FROM

ok got all this info, im trying to get a 9.5x905 V-belt not toothed for my
1200 with dynamo, anyone done this and know where to get them.

----------------------------------------------------

Belt Size
The fan belt used by VW has evolved over the years. They used the 9.5 x 900mm V belt for their 6-volt engines. The Continental 9.5 x 905mm V belt was later used on the newer 12v generator engines. Continental later standardized their belts to a 10 x 900mm (111-905-137B) and 10 x 905mm (OEM 111-903-137D) belt and VW came out with new OEM numbers to reflect this change.

Earlier bugs had smaller belt which was sufficient for the demands of their low wattage generators and smaller fans of their time. The 36hp engine had a fan with 24 blades and a 160 watt generator. The 40hp and 1300/1500/1600cc single-port engines had fans with 28 blades which increases the demand on the fan belt to a small degree. Plus during that time, the generator output rose from 160 watts to 360 watts. As a result, the 1500/1600cc single-port engines had a 5 hp load on the fan belt, whereas the earlier engines only had 4hp. Later, in 1971, the introduction of the doghouse cooler also meant a 5mm wider (10% increase) fan which brought the load on the belt to around 5.5hp. In 1973, the addition of the 220 watt alternator brought the belt load to a whopping 6hp. And with signs of early failures from the thin VW belts, it was time to upgrade the belt size, so the 1973 alternator also got a much thicker heavier duty 11.3 x 912 mm v-belt.

In regards to what belt will work for an engine with an alternator or generator - thicker is better. For the most part, you can run the older thinner belts in a newer engine with an alternator and likewise can run the thicker newer belt in an older engine with a generator. You will just have to add or subtract shims as needed. Properly fitted thicker quality belts should last longer than thinner belts in any VW.

Also note that belts from different manufactures also vary to some degree in true size and different combinations of pulleys and belts can have a surprising impact on belt tightness. The stock pulleys for the generators and alternators are the same, but these pulleys are often replaced with aftermarket ones by previous owners, so you may have to go with a longer or shorter belt to get the perfect fit. Because of this, you may need to experiment with several belts, remember which one works for your auto and remember to buy a spare.

Stock VW 1600 DP with Alternator Belt:
Brand Part Number Size US Conversion Metric Conversion
OEM 111-903-137-E 11.3 x 912mm 0.4448 x 35.9055" 11.3 x 912mm
Gates 7355 13/32" x 36 1/8" 0.4063 x 36.125" 10.3 x 917.6mm
Altrom (NAPA) ATM 11X912
Gatorback (Good Year) 15361 0.438" x 35.500" 0.438" x 35.500" 11.1 x 901.7mm
Dayco 15358 0.44" x 35.75" (36.3" outside circumference 36) 0.44" x 35.75" 11.2 x 908.1mm
Goodyear 13355
Metric 10X910
Master Pro (O'Reilly) 7355
Master Pro (O'Reilly) 15355
Duralast (AutoZone) 15355 0.438 x 35.500" 0.438 x 35.500" 11.1 x 901.7mm

Euro:
Bosch 1987947500
Continental 11.3-912
Continental 6578116
DIN 11.3X912
Gates Europe N.V. II: 6372
Goodyear 11AV0913
Motorcraft EJD91

The US Gates 7355 v-belt is supposed to fit:
Beetle 1960-1979
Campmobile 1968-1970
Karmann Ghia 1960-1974
Super Beetle 1975-1979
Thing 1973-1974

In case you need to convert inches to and from mm:
mm
inches



Loose Belt
If your belt is too loose with all the shims removed, you may have a one off pulley or worn alternator bearing. A slightly smaller than stock belt is one potential fix. The Gates 7350 (13/32" x 35 5/8") should do the trick.
Brand Part Number Size US Conversion Metric Conversion
Gates 7350 13/32" x 35 5/8" 0.4063 x 35.6250" 10.3 x 904.9mm
Altrom (NAPA) 10X900
Gatorback (Good Year) 15356 0.438" x 35.000" 0.438" x 35.000" 11.1 x 889.0mm
Dayco 15350 0.44" x 35" (35.6" outside circumference 36) 0.44" x 35" 11.2 x 889mm
Dayco 15355 0.44" x 35.5" (36.1" outside circumference 36) 0.44" x 35.5" 11.2 x 901.7mm
Goodyear 13351
Metric 10X900
Metric 10X890
Master Pro (O'Reilly) 7350
Master Pro (O'Reilly) 15350
Duralast (AutoZone) 17350 (13AV0890) 1.3cm x 89cm 0.512 x 35.0" 13 x 890mm
Duralast (AutoZone) 17345 (13AV0875) 1.3cm x 87.5cm 0.512 x 34.4" 13 x 875mm

Tight Belt
If your stock sized belt is too tight, the the Gates 7360 at 36 inches (914.4mm) should work for you.
Brand Part Number Size US Conversion Metric Conversion
Gates 7360 13/32" x 36 5/8" 0.4063 x 36.6250" 10.3188 x 930.275mm
Altrom (NAPA) 10X913
Altrom (NAPA) 10X918SET
Altrom (NAPA) 10X920
Gatorback (Good Year) 15366 0.438" x 36.000" 0.438" x 36.000" 11.1 x 914.4mm
Dayco 15360 0.44" x 36 (36.6" outside circumference 36) 0.44" x 36 11.176 x 914.4mm
Goodyear 13361
Metric 10X915
Master Pro (O'Reilly) 7360
Master Pro (O'Reilly) 15360
Duralast (AutoZone) 17360 (13AV0915) 1.3cm x 91.5cm 0.512 x 36.0" 13 x 915mm
Duralast (AutoZone) 17365 (13AV0925) 1.3cm x 92.5cm 0.512 x 36.4" 13 x 925mm


Continental 9.5 x 905mm for vintage VW diehards

12V Generator Belt
Stock VW 1600 with 12V Generator used a thinner belt (but can still use a thicker one too):
Brand Part Number Size
OEM 1966 to 1973 111-903-137-D 10 x 905 mm
Volvo 973547 9.5 x 905mm
Mercedes 006-997-02-92 10 x 910mm (37 3/4 inch)
Altrom (NAPA) ATM 10X905 10 x 905 mm
EMPI 00-9928-B 9.5 x 905mm

If this is too loose, you can try a 10 x 900mm belt used on the 6V VWs (OEM 111-905-137B)
Brand Part Number Size
OEM 1947-1966 111-905-137B 10 x 900 mm
Altrom (NAPA)
ATM 10X900
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Old 03-07-2010, 07:46 AM   #2
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Good info here, also backs up my findings with beetle cup rolling road tests for alt/cooling fan power losses, or gains if you do something about it.
GSF have a good 'own brand ' belt range.
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Old 03-07-2010, 10:47 AM   #3
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I bought some 111 903 137E Optibelt belts from GSF Newcastle a couple of days ago.
I use them on almost everything
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Old 03-07-2010, 10:35 PM   #4
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hey mucky, are they smooth non toothed? would it fit dynamo, if so Ill give them a ring
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Old 04-07-2010, 09:13 AM   #5
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Quote:
Originally Posted by fpr936e View Post
hey mucky, are they smooth non toothed? would it fit dynamo, if so Ill give them a ring
Yes. That's why I use them
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Old 04-07-2010, 10:01 AM   #6
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Quote:
Originally Posted by Mucky Green View Post
I bought some 111 903 137E Optibelt belts from GSF Newcastle a couple of days ago.
I use them on almost everything
That's odd. When I emailed GSF a few months ago, they said that they didn't stock them any more. I guess it must be ring up the various GSF branches to get them. What's the stock number for the optibelt ones (eg. is it different to the useless toothed fan belt variety) ?

I have also tried to order Beru UX79 spark plugs from thier website (using thier old stock code BBUX79) but they don't seem to be there anymore and they only sell the rubbish Bosch spark plugs. I guess I'll have to try and find another Beru spark plug stockist.
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Last edited by phade; 04-07-2010 at 10:09 AM.
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Old 04-07-2010, 10:09 AM   #7
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Quote:
Originally Posted by phade View Post
That's odd. When I emailed GSF a few months ago, they said that they didn't stock them any more. I guess it must be ring up the various GSF branches to get them.

I'm having problems getting Beru UX79 spark plugs (I even tried thier old stock number UXX79, but I'll have to find out what I jotted down in an Excel workbook) at the moment since the GSF online shop only seems to sell the Bosch crap.
I noticed that Bosch plugs are now made in India and China, but TBH the set that are on my engine have lasted nearly 20,000 miles. I check them with every periodic service and they are showing minimal signs of wear, the gaps stay spot on and the Van starts on the button. So the Bosch crap can't be that bad.
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Old 04-07-2010, 10:16 AM   #8
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[quote=fpr936e;7081853]ok got all this info, im trying to get a 9.5x905 V-belt not toothed for my
1200 with dynamo, anyone done this and know where to get them.

----------------------------------


Loose Belt
If your belt is too loose with all the shims removed, you may have a one off pulley or worn alternator bearing. A slightly smaller than stock belt is one potential fix. The Gates 7350 (13/32" x 35 5/8") should do the trick.


Is this the same for a dynamo?
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Old 04-07-2010, 10:18 AM   #9
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Quote:
Originally Posted by clarkson View Post
I noticed that Bosch plugs are now made in India and China, but TBH the set that are on my engine have lasted nearly 20,000 miles. I check them with every periodic service and they are showing minimal signs of wear, the gaps stay spot on and the Van starts on the button. So the Bosch crap can't be that bad.
I wish I could say the same about the Bosch HT leads I had on my 1600i beetle once. They barely lasted 20,000 miles before two of the carbon resistor (cheap and nasty) HT lead ends fell to bits. I have since swapped those for the Beru ones.

If they last approx 20,000 miles as you say, I may begin to trust the Bosch W8DTC/WR78X or equivalent spark plugs. As my 1600i mexican beetle is my daily driver and I also drive a lot of miles (I depend on it for my business), I cannot really afford to take that chance.
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Old 04-07-2010, 11:22 AM   #10
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i use about 150/ 200 bosch plugs per year, air and water cooled, ive never had one problem, even since they went to the asian manf'g sector in about '95. thats a lot of plugs.. any brand, any part is being ripped off these days, plugs that fail will be snides.
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