Air Injection Pump Lifespan - Mercedes-Benz Forum
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post #1 of 20 (permalink) Old 03-20-2018, 04:50 PM Thread Starter
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Air Injection Pump Lifespan

Hey guys -- How long should the secondary air injection pump last?

My pump went bad back in 2013 and I replaced it with a remanufactured unit from Pelican Parts, and now it just crapped out again. I put about 40,000 miles on it in that time.

This seems like a short lifespan to me... or am I wrong? Anyone have any experience here? Should I complain to Pelican?
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post #2 of 20 (permalink) Old 03-20-2018, 05:45 PM
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Certainly something I'd like to know, since I may be replacing mine.

If I may ask, Thom, what were the signs that your's went bad?
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post #3 of 20 (permalink) Old 03-20-2018, 06:15 PM Thread Starter
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It starts making a pretty hellacious bearing noise. It's a rattle that starts subtly but gets progressively worse until it sounds like rocks in a clothes dryer. Eventually it will seize up and snap the serpentine belt.
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post #4 of 20 (permalink) Old 03-20-2018, 07:07 PM
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Should last the life of the car. I'm at 210k miles with original one. It is super rare to replace one.

Martin
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post #5 of 20 (permalink) Old 03-20-2018, 07:20 PM Thread Starter
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Hmmm. So is there something that could be done wrong with the installation that could be causing mine to break? Or is it just bad luck?
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post #6 of 20 (permalink) Old 03-20-2018, 08:29 PM
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More than likely bad luck.

Otherwise, maybe too much tension on the belt or the belt isn't totally aligned?

Honestly it's just an air pump it's not like it could be ruined easily.
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post #7 of 20 (permalink) Old 03-20-2018, 09:00 PM Thread Starter
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Actually when I looked at it, the belt pulley was wobbly. So maybe there was some kind of alignment or tension issue, and that's what messed up the bearings?

Does that make sense to anyone?
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post #8 of 20 (permalink) Old 03-20-2018, 09:18 PM
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Air pump really has two parts that fail:

A) the bearings

B) the electrical clutch

So yours is the bearings? 94 to 99 cars have a spring-loaded tensioner. Unless the belt was always too small to begin with. The force is the same on all of those cars. 92/93 have a drive-jack screw, and those cars you can over tighten the belt.

Get a new belt by the part number for your car not one that is matched to your old belt.

Maybe the smog pump wobbles when it is all bolted-up, and/or the pulley is at a wrong angle...

Smog pumps do not fail on these cars..

The S320's the clutch is miss diagnosed for it being shorted when what really shorts out is the drive-transistor for the engine module shorts out 92-96 cars frequently. I have seen four cars like this. The clutch on S320's is not driven from a relay, but from a transistor in the engine module directly..

Martin

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post #9 of 20 (permalink) Old 03-20-2018, 09:37 PM Thread Starter
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Yeah, it sure sounds like the bearings to me. The belt itself is a Contitech that I also ordered from Pelican at the same time the smog pump was replaced a few years ago. So yeah, definitely the right part number.

I first heard the rattling noise while driving, and it got progressively worse until the car stalled out at a stop sign. I restarted it and got it back to my driveway but the noise was pretty awful at that point. Thankfully I was only a few blocks away.

When I got into the driveway I popped the hood to see what was up, and the smog pump pulley was wobbly and even threw off an occasional spark. I turned the car off after that and didn't mess with it.

I might take a video of it just to illustrate what I'm talking about. If there's something that needs to be adjusted to keep this from happening I definitely want to get to the bottom of it.
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post #10 of 20 (permalink) Old 03-20-2018, 09:57 PM
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My car with 222,000km had a noisy bearing, wasn't crazy loud but had some play and was rough when spun

Replacment SKF bearing was about 150 NZD so i just deleted the entire system as it doesn't matter here
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