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Old 06-04-2019, 09:54 AM
Father Of Giants's Avatar
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M112 Alternator on OM603?

There's two 3.2L M112 Mercs at the yard right now I need an alternator for the SDL, are the mounting points on the OM603 and M112 alternator the same? I still have the old alternator so I can switch pulleys if need be.
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1986 Mercedes 300SDL Black - 320,000 miles. Out of retirement

1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

Don't forget to grease the screw and threads on the spring compressor.
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Old 06-04-2019, 10:09 AM
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Originally Posted by Father Of Giants View Post
There's two 3.2L M112 Mercs at the yard right now I need an alternator for the SDL, are the mounting points on the OM603 and M112 alternator the same? I still have the old alternator so I can switch pulleys if need be.
It depends on what year and what chassis it came from. All M112 or m113 alternators will bolt up to your 603 but the later ones (w203 w211 R230 etc) use a digitally controlled voltage regulator which needs to be swapped out for a conventional B+ D+ VR. Also if you're looking at anything over 90a you need to use a over running pulley when mounting it to the diesel. Otherwise it'll murder your tensioner and damper.

On my 603 I'm using a 150a alternator from an R230.
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Old 06-04-2019, 10:37 AM
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They're from a 2000 E320 and a 2002 Ml320, I'll also take the alternator harness as well.

I never understood the over running pulley, how do I get one?
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1986 Mercedes 300SDL Black - 320,000 miles. Out of retirement

1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

Don't forget to grease the screw and threads on the spring compressor.

Last edited by Father Of Giants; 06-04-2019 at 11:25 AM.
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Old 06-04-2019, 10:40 AM
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The overrunning pulley is absolutely required if you're running the high amp alternator. The INA one for the VW will fit. You'll need a special tool to install it. I have a 143A in my SD from a '94 S420. The inertia from the heavy rotor will quickly tear up your tensioner and damper as mentioned above.
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'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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Old 06-04-2019, 11:05 AM
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Originally Posted by Father Of Giants View Post
They're from a 2000 E320 and a 2002 Ml320, I'll also take the alternator harness as well.

I never understood the over running pulley, had to I get one?
https://youtu.be/DGI9XLuhaYY

https://imgur.com/70bYUf1

https://imgur.com/s5K4KqI
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  #6  
Old 06-04-2019, 11:13 AM
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Originally Posted by Diseasel300 View Post
The overrunning pulley is absolutely required if you're running the high amp alternator. The INA one for the VW will fit. You'll need a special tool to install it. I have a 143A in my SD from a '94 S420. The inertia from the heavy rotor will quickly tear up your tensioner and damper as mentioned above.
Which model VW do I buy it from?
__________________
1986 Mercedes 300SDL Black - 320,000 miles. Out of retirement

1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

Don't forget to grease the screw and threads on the spring compressor.
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  #7  
Old 06-04-2019, 11:31 AM
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Which model VW do I buy it from?
Any Jetta or Golf. They're all the same. They're about $20 all over the Internet, do a search.
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'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #8  
Old 06-04-2019, 11:47 AM
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Originally Posted by Diseasel300 View Post
Any Jetta or Golf. They're all the same. They're about $20 all over the Internet, do a search.
Ok
__________________
1986 Mercedes 300SDL Black - 320,000 miles. Out of retirement

1997 E300 Captain Slow - 218,000 miles

2000 Mercedes E320 Black - 136,000 miles - New daily driver.

Don't forget to grease the screw and threads on the spring compressor.
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