M104 engine air pump bypass belt length - please!
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Joined: Mar 2011
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From: Minneapolis
2002 CLK55, 1993 190E, 1975 230C, 2007 E350
M104 engine air pump bypass belt length - please!
i have a 95 E320 (104 motor) that the air pump has gone out in - again. Owners manual says 2445 belt length for the thing with air pump, does anyone know what length I would need to just unplug the air pump and bypass the thing? I am on my third pump now, and I think I should just bypass it - car is now being driven by my daughter as it is the safest car I have, but I do not want to drop too much into the thing - she will get my father's W220 in a couple of years, and that will be fine for her in college, and this is her first car.
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Joined: Jun 2008
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From: IL / WI
Depends on the day
why are the pumps going out? do the bearings keep freezing or what?
you know you can unplug the pump and prevent the clutch from engaging right? if your problem is only when the thing engages, then unplug away and just keep the dead weight there.
you know you can unplug the pump and prevent the clutch from engaging right? if your problem is only when the thing engages, then unplug away and just keep the dead weight there.
Thread Starter
Member
Joined: Mar 2011
Posts: 83
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From: Minneapolis
2002 CLK55, 1993 190E, 1975 230C, 2007 E350
don't know
I don't know why they keep going out - I had the first one done at 80K, thing started making the putt-putt noise, and I took it to my mechanic. Second one went out at 90K - probably not a great pump re-build, but my mechanic put in a new one for labor only. Car has 160 on it now, and the bearings in this one are going.
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Joined: Jun 2008
Posts: 281
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From: IL / WI
Depends on the day
holy crap man.
i still have my original one after 166k! (although unplugged because the clutch is going out)
i dont know the belt length and am eager for an answer here soon because i'd love to get rid of that dead weight.
i still have my original one after 166k! (although unplugged because the clutch is going out)
i dont know the belt length and am eager for an answer here soon because i'd love to get rid of that dead weight.
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Joined: Feb 2008
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MG TC
i have a 95 E320 (104 motor) that the air pump has gone out in - again. Owners manual says 2445 belt length for the thing with air pump, does anyone know what length I would need to just unplug the air pump and bypass the thing? I am on my third pump now, and I think I should just bypass it - car is now being driven by my daughter as it is the safest car I have, but I do not want to drop too much into the thing - she will get my father's W220 in a couple of years, and that will be fine for her in college, and this is her first car.
As I recall you'll need a bracket, spacr tube, a few fasteners and MAYBE, MAYBE the bearing bracket but I am not sure of that. If you don't need the bracket it's about $15 in parts not including the belt from your local MB dealer. Might as well get a new pulley while it's apart (around $50 or so).
When on the EPC you'll be able to check the belt length for the air pump delete option for the 104 engine.
If you need me to order them my guy will order stuff direct from Germany even though the parts are technically blocked by MBUSA. "Ve have our vays!"
If I have time next week I'll make out a conversion list if no one does it first.
FWIW you can do the same for the M119 engine by using the Euro 034 car as a guide.
Kind Regards,
Ron
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Joined: Mar 2011
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From: Minneapolis
2002 CLK55, 1993 190E, 1975 230C, 2007 E350
String trick
I just used the old string trick - took one piece and wrapped it around the alternator, air pump, and idler pulleys, cut it, and then took the air pump out, wrapped a string around the alternator and idler pulleys - length difference is about 30mm - should be the same for most others in this series as well. Off to the auto parts store!
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Joined: Nov 2002
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From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
Try this
I recently did an extensive search for the same thing (different reason). Try looking here: smog-pump-answer-finally-number. A 30 mm difference seems correct as that person went to a 6PK2415 belt.
Hope this helps.
- FD
Hope this helps.
- FD
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Member
Joined: May 2005
Posts: 151
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From: Atlanta, Ga
'16 E350 ‘07 S550 ‘21 GLE580
Air Pump bore cover
You also need part number A1040160033
To plug air injection bore/Smog pump bore on the side of the head. It was $3.60 when I bought it from my dealer in January. Also, I was able to use my existing belt, the belt tensioner took up the slack with no problem.
To plug air injection bore/Smog pump bore on the side of the head. It was $3.60 when I bought it from my dealer in January. Also, I was able to use my existing belt, the belt tensioner took up the slack with no problem.
Thread Starter
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Joined: Mar 2011
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From: Minneapolis
2002 CLK55, 1993 190E, 1975 230C, 2007 E350
my plug
Car is back on the road - no check engine light, running fine. I used the rubber hose with an aluminum plug in it to seal off the thing for the weekend, I will go get the correct plug this week if I can. 30mm shorter belt, pull off the pump, plug the hole for air injection, and thing is working fine.
Next weekend, re-build the calipers and do the flexible brake lines for her.
Next weekend, re-build the calipers and do the flexible brake lines for her.
Last edited by lsboogy; May 1, 2011 at 08:54 PM.
