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  #1  
Old 07-25-2022, 02:18 PM
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Which alternator belt should i use? 240D

Replaced my alternator due to extreme ovalization of the pivot holes, and when i installed the old belt on the new alternator, it would not tighten within the range of the adjuster. It is Contitech 13 x 1030. I see that Pelican also has a 10 x 970 listed for my 1981 240D. How could that be?

My old belt is quite worn from running crooked for maybe 20,000 miles. Could that make it stretch or sit lower in the groove enough that it is too loose to tighten sufficiently?? Or do i need a smaller belt?

Thanks

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  #2  
Old 07-25-2022, 02:47 PM
t walgamuth's Avatar
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Location: Lafayette Indiana
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I'd say yes on the new belt.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

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  #3  
Old 07-25-2022, 03:36 PM
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Same size belt?

Definitely need a new belt, but wondering if i should go to a smaller belt, or stick with the 13 x 1030
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  #4  
Old 07-25-2022, 03:50 PM
t walgamuth's Avatar
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I'd go with stock.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 07-25-2022, 06:05 PM
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Join Date: Feb 2011
Location: Modesto CA
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Quote:
Originally Posted by sun tortise View Post
Replaced my alternator due to extreme ovalization of the pivot holes, and when i installed the old belt on the new alternator, it would not tighten within the range of the adjuster. It is Contitech 13 x 1030. I see that Pelican also has a 10 x 970 listed for my 1981 240D. How could that be?

My old belt is quite worn from running crooked for maybe 20,000 miles. Could that make it stretch or sit lower in the groove enough that it is too loose to tighten sufficiently?? Or do i need a smaller belt?

Thanks
The 10mm wide belt (OEM 9.5mm) will be the correct one for the alternator.
A 13mm wide belt is used for the A/C compressor, and for the steering pump.
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  #6  
Old 07-25-2022, 10:45 PM
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Quote:
Originally Posted by Frank Reiner View Post
The 10mm wide belt (OEM 9.5mm) will be the correct one for the alternator.
A 13mm wide belt is used for the A/C compressor, and for the steering pump.
10mm is for a dual belt alternator.
The single belt design is 13mm
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #7  
Old 07-30-2022, 01:47 PM
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Thank you. Problem solved m/l

I went with the 13 x 1030, and it seems to fit fine. My 1985 300D with the dual pulleys uses the narrower 10 x 970 belt.

Got a crappy alternator from Heartland Starter (on Flea Bay), and one of the pivot holes (pulley side) is too large, so it sat crooked. Shoulda sent it back, but it was such a PITA to install, so i shimmed it with some flattened folded over TV antenna elements. Hope it holds.
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  #8  
Old 08-05-2022, 11:14 PM
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For all V-belts in all cars, download a catalog like Gates. They generally come in 3 widths, with lengths in 50 mm increments, as I recall. Newer belts usually have a label like AV1130, meaning 1130 mm long OD. Some list the length at the mid-section. Once you get the length code, search ebay and Amazon. I had to try up to 3 belts to get a perfect fit for custom AC brackets on my 1960's Mopars, due to estimating length w/ rope, varying length definitions, and limited swing on the compressor. But most cost <$10 and oops go in my V-belt box. For the M'-B alternator, always but a matched pair.
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  #9  
Old 08-07-2022, 01:56 AM
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Quote:
Originally Posted by BillGrissom View Post
For all V-belts in all cars, download a catalog like Gates. They generally come in 3 widths, with lengths in 50 mm increments, as I recall. Newer belts usually have a label like AV1130, meaning 1130 mm long OD. Some list the length at the mid-section. Once you get the length code, search ebay and Amazon. I had to try up to 3 belts to get a perfect fit for custom AC brackets on my 1960's Mopars, due to estimating length w/ rope, varying length definitions, and limited swing on the compressor. But most cost <$10 and oops go in my V-belt box. For the M'-B alternator, always but a matched pair.
Again… only on the turbo v-belt alternators… the N/A uses a single belt…

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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