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#1
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serpintine belt
where is the tensioner for the belt on a 90 300SEL? I can't seem to find it anywhere. I want to remove the alternator.
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#2
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If you just want to remove the alternator it is possible to take the lower bold of the alternator out and flip it up.
That releases all tension from the belt. Rob |
#3
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Great thanks! Is there a tensioner on there though?
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#4
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The tensioner is on the other side of the engine.
There is a small shock absorber attached to the top of the engine, that shock absorber goes to the tensioner. To adjust the tensioner you have to release the big bold that goes trough the tensioner first, then adjust with the long nut next to the steering fluid reservoir . Best to soak it first with penetrating oil. There is a indicator on the front of the tensioner. Set the indicator to the first mark when the tension is released, with full tension it should be at the 7th mark (if you tensioner is still OK, the rubber tensioning parts do wear out). Rob |
#5
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Great tip on loosening the alternator bolt to get belt loose! I have to do my daughter's water pump tomorrow and I didn't want to remove fan clutch and all...thanks!!!
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#6
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Best of luck changing your water pump without removing the fan and fan clutch on a M103 engine.
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#7
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I know how to get fan clutch off and have done it but why does it need to be done if you can get the belt off another way? Is it in the way somehow? Just curious. The manual doesn't show to remove the fan or clutch:
http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/103/20-2100.pdf |
#8
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WOW!!! 5.5 Hours to replace my daughter's waterpump and YES, you have to remove the fan clutch and everything!!! The forum is always right!That was the hardest repair I've ever done myself. I needed to use every tool and angle thingy available. Removed pulleys, tensioner bracket, tensioner, etc. No wonder they want so much money to do that job at the repair shop. I think I can do it in under 3 hours next time though. All of that because of a .20 cent rubber band gasket on the bottom of the pump. I put a new pump in anyway. Total price for parts...$234.00...labor...just my aching back but a great sense of accomplishment.
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#9
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5.5. hours for your first M103 water pump replacement is not too bad - others have taken 8 hours plus.
That small O ring on the waterpump is a pain ![]() ![]() |
#10
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i've done it twice....5.5 hours is about right....took me that long the second time too, I think
__________________
1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k ![]() 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC] |
#11
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What you are aiming for.
![]() Location of pulley on engine ![]() Where to put your holding tool ![]() Use a 7mm allan key and use an extension such as shown ![]() |
#12
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For the allan key I used a 7mm allan socket and welded it to a strong metal strip. No torsion and less risk to strip the head.
Rob |
#13
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Great pictures and angles!!!
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