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W126 Starter issues
My starter is well on the way out, and it needs to be replaced. It gets one to four good cranks, and then seems to lose power. In cold weather, its often not enough to start the engine. The speedometer will blip periodically, the tach rarely, and the engine never gets thrown over fast enough to start.
So, it needs to be replaced. This is a W126, a `87 300SDL. How difficult is this operation? What does it entail? A 30 second "feel what the starter is mounted in to" inspection in biting 10°F cold revealed two bolts holding the start on. With regards to the starter, is it just a matter of unbolting it and bolting in the new one, and changing leads? How much work is required to access the starter? From the top, I can see and feel the starter pretty well, but I'd wager those bolts will be torqued to >75lbs, which mandates better access. I havent yet jacked the car up to check underside access-- it looks like there may be some steering elements in the vicinity. How much equipment needs to be disconnected & moved out of the way, or is it possible to do this operation in place? An older post seems to confirm this operation is relatively simple; Quote:
My one other concern is with finding a replacement starter. Currently my starter just doesnt have enough power to throw the engine over-- I want absolute certainty the replacement will have plenty of power, at least as much as a stock one. I presume a decent remanu'd Bosch will suffice? Are there any better options? Thanks! rektide |
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ohhh ffff; om603 starter motor replacement. thanks ccooper, somehow my initial search didnt find that thread.
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Starter Replacement
Access the starter from the bottom when you have the car jacked up in a safe manner... You can access the wires from under the car and also by removing the Air Cleaner on a diesel. Be sure and disconnect the battery... From under the car you will need to remove two(2) allen bolts that hold the starter in place... use either a 8mm or 10mm allen socket.. Torque will not be to bad.. I usually use a short pipe over the rachet to help.. Some of the starters have a small bracket at the front of the starter but I think they are rare..
If you need a used starter in good condition for a 126 just let me know your location and I will give you a good price.. Jim
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James A. Harris |
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Why the starter and not the battery?
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
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Even while jumping, the starter is massively underperformant... its 20F out now and I havent been able to get the starter to get the tach to move. The starter audibly sounds like its a lame.
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I ought mention I'm at 9k feet elevation... that obviously has to have some impact on attaining sufficient compression to start up.
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This DIY is IT.
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'84 300SD sold 124.128 Last edited by compress ignite; 12-06-2009 at 04:51 PM. |
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Replace the battery, thoroughly clean the cable clamps, and your starting problem will disappear. |
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I just (about ten minutes ago) yanked the starter out of my 82 with an OM617. Assuming they kept the same basic style, there are the two allen head bolts that you access from the rear, 10mm allen. There is also a bracket at the other end of the starter with two bolts. One thing to check is the cables, especially at the ends. These get corroded and add an enormous amount of resistance. Charge the battery and have someone crank it while you measure the voltage drop from the battery post to the starter post, if it's more than about .3v, there is excessive resistance and you need to replace the cable.
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Armature
Armature
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'84 300SD sold 124.128 |
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Quote:
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Hmmmm?? Compression PSI the same irregardless of altitude? I'm not convinced. Ratio yes, actual pressure, I think is less.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
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The comrpession pressure will vary based on altitude, but it's not enough to worry about. Maybe 320psi vs 317-318psi. Not a factor. Cold, thick 15w40 isn't helping, poorly functioning glow plugs aren't helping, and having only about 30% of your full summer cranking power doesn't help either. |
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This will impact starting capability. Thanks for the clarification. I'll delete the aforementioned post to avoid any confusion. |
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Quote:
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