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98 E320 sedan
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Discussion Starter · #1 ·
ok so I been hearing this whinning sound almost like a super charger. from engine bay when car is warm at 80 centigrade. I thought it was my trans so I got a filter/gasket/fluid change but I still hear it. my idler pulley arm is moving a bit. but I only hear it when accelerating. also im not sure if my car is a 5 speed or 4. but when driving I only count 3 shifts and when doing the speed limit which is 70mph on freeway it stays at 2500 rpm the entire time. is that normal for a 98 e320 w210? the other thing is when im accelerating im hearing this gurgle type tick then it goes away, but only when I accelerate for the 1st 2 shifts then I don't hear it let alone when in idle. anyone have this same problem? I don't want to have to replace the engine etc. I think I have the long engine. its big with a big fan so theres a clutch buts no engine lights or codes on and this just started a couple weeks now. own the car since September this year. if its not engine it has to be bearings or maybe trans mount/bushing. just did a 2nd trans today, but a partial drain was done 3 days ago didn't have all the tools. much help would be great.
 

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2017 Ram EcoDiesel, 2014 GLK 350, 2013 BMW R1200GS KC
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Woah...slow down a little and take a breath! Some of your post/questions are really hard to understand.

You should have the M112 V6 engine in your car if it is a 98 model, the previous model had the M104 I6 (long engine).

You do have a 5-speed automatic transmission, the [email protected] are normal. If you only count three shifts check if the mode selector is in W which makes your car take off in 2nd gear all the time.

As far as the noise is concerned you have to be a bit more specific. It could be a slipping belt. I think your car only has electric fan(s). Some models had two fans in front of the radiator, my 01 E320 has only one electric fan behind the radiator.
 

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98 E320 sedan
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42 Posts
Discussion Starter · #3 · (Edited)
Woah...slow down a little and take a breath! Some of your post/questions are really hard to understand.

You should have the M112 V6 engine in your car if it is a 98 model, the previous model had the M104 I6 (long engine).

You do have a 5-speed automatic transmission, the [email protected] are normal. If you only count three shifts check if the mode selector is in W which makes your car take off in 2nd gear all the time.

As far as the noise is concerned you have to be a bit more specific. It could be a slipping belt. I think your car only has electric fan(s). Some models had two fans in front of the radiator, my 01 E320 has only one electric fan behind the radiator.
so my 05/98 e320 sedan is a m112 and not a w210? strange I was told it was a w210. and the mode is in s since its down and the w is up. sorry I had everything bunched together just was trying to put more info out. I have a fan where the water pump is and 2 small fans in front of the radiator. and as for slipping belt you mean the serp belt? but as for the tranny I did a partial drain because I had to lay on the ground. so I took it to a shop and they did a full drain gasket and filter for me $40 good thing I know balistrari or how ever you spell it. but for the ticking sound it sound like a gurgling tick, not the purge valve I hear that separate, but the gurgling sound is when I accelerate then it stops. its weird but Ilooked on 1 of my stickers it says a 210 then again I did google they made the 210 97-2002 and also did the m112 98 up so im a bit confused
 

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2002 E430 4-Matic
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I'm not sure if it's your phrasing or if you are as confused as you sound. And you sound really confused. Are you sure you have the skills to tackle this? Otherwise, perhaps you are better off finding a reputable independent Mercedes Benz shop (or at least a friend that has some mechanical experience) and explain to them what your concerns are.

You could easliy cause thousands of dollars of damage to your transmission with one small mistake.

I will tell you that 2,500rpm @ 70mph is about right and you are most likely in 5th gear. Depending on throttle setting some of the shifts are so smooth that they can easily go unnoticed.
 

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98 E320 sedan
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42 Posts
Discussion Starter · #5 · (Edited)
I'm not sure if it's your phrasing or if you are as confused as you sound. And you sound really confused. Are you sure you have the skills to tackle this? Otherwise, perhaps you are better off finding a reputable independent Mercedes Benz shop (or at least a friend that has some mechanical experience) and explain to them what your concerns are.

You could easliy cause thousands of dollars of damage to your transmission with one small mistake.

I will tell you that 2,500rpm @ 70mph is about right and you are most likely in 5th gear. Depending on throttle setting some of the shifts are so smooth that they can easily go unnoticed.
im very confused? im simply stating what I was told. my trans fluid change was done at aamco tranny shop yesterday. im very familiar with working on cars 20yrs exp just not familiar with benz. as I stated above I was just trying to put everything in with 1 breath pretty much. im tired I work 16hrs a day 6 days a week as an engineer . and I wanted to make sure I wasn't tripping with the rpm to speed ratio. :rolleyes:
 

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E-ZGO 53 HP., 99 E 430 sport, 04 E55 AMG, 2008 Tahoe LTZ Sold Porsche to Brother
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A gurgling sound in the dashboard could be R134 flowing through a wide open expansion valve. Push your "EC" button and see if the sound stops.
 

· Outstanding Contributor W221 Moderator
2015 S550, 2010 E350 P1/P2, 2002 ML320
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I suspect your water pump bearing is on its way out, based on the whining and gurgling in the dash (coolant with air flowing through your heater core is a possibility.) You can verify this by removing the drive belt and spinning the pulleys on the front of the engine.

There should be six pulleys for your engine and also one for the crankshaft (don't spin this one ;) );

- Water pump (and mechanical fan in your case)
- Power Steering Pump
- A/C compressor
- Tensioner
- Idler (above the water pump)
- Alternator

They should all spin smoothly, some with resistance. If have have one that has a bit of a grinding noise when you spin it, then investigate it further. The water pump bearing usually fails along with seepage from the weephole which points in the direction of the alternator when installed.
 

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98 E320 sedan
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Discussion Starter · #10 ·
A gurgling sound in the dashboard could be R134 flowing through a wide open expansion valve. Push your "EC" button and see if the sound stops.
I remember pushing that button/switch because I never knew what it was for. I do remember you giving me correct advise last time so I will try should it be on or off? but the gurgle tick is when I accelerate. could it be a knock sensor or cam sensor? my car has some type of feature you tap the start and it will start itself instead of holding the key over till it starts, also since you on here im having a leak it almost looks like oil front corner of oil pan by the cooler line. but my oil is pristine and this is dirty looking started after getting an underbody flush at the car wash could be my cooler line since that's where its at.
 

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98 E320 sedan
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Discussion Starter · #11 ·
I suspect your water pump bearing is on its way out, based on the whining and gurgling in the dash (coolant with air flowing through your heater core is a possibility.) You can verify this by removing the drive belt and spinning the pulleys on the front of the engine.

There should be six pulleys for your engine and also one for the crankshaft (don't spin this one ;) );

- Water pump (and mechanical fan in your case)
- Power Steering Pump
- A/C compressor
- Tensioner
- Idler (above the water pump)
- Alternator

They should all spin smoothly, some with resistance. If have have one that has a bit of a grinding noise when you spin it, then investigate it further. The water pump bearing usually fails along with seepage from the weephole which points in the direction of the alternator when installed.
wouldn't I smell coolant then? and its also full. but I spun the fan but not the clutch itself yet. my tensioner does move a tad bit when running, looks sort of new
 

· Outstanding Contributor W221 Moderator
2015 S550, 2010 E350 P1/P2, 2002 ML320
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wouldn't I smell coolant then? and its also full. but I spun the fan but not the clutch itself yet. my tensioner does move a tad bit when running, looks sort of new
Not necessarily, the Benz coolant doesn't quite have the same brown-sugary smell that conventional coolants do. Have you had the belt off to check the pulleys prior to today? Honestly that's where I would start, it has saved me a bunch of time in the past.
 

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98 E320 sedan
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Discussion Starter · #13 ·
Not necessarily, the Benz coolant doesn't quite have the same brown-sugary smell that conventional coolants do. Have you had the belt off to check the pulleys prior to today? Honestly that's where I would start, it has saved me a bunch of time in the past.
I didn't get that far its a bit cold out here in Wisconsin. but wouldn't my coolant be low if it was seeping? its good and has been checked for electrolyte and its all good.
 

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98 E320 sedan
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Discussion Starter · #15 ·
Not necessarily, the Benz coolant doesn't quite have the same brown-sugary smell that conventional coolants do. Have you had the belt off to check the pulleys prior to today? Honestly that's where I would start, it has saved me a bunch of time in the past.
the strange thing is that it has the same viscosity as engine oil, my levels are up to par for that. so idk
 

· Outstanding Contributor W221 Moderator
2015 S550, 2010 E350 P1/P2, 2002 ML320
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Power steering fluid comes to mind then. How is your steering fluid level? Remember to be as clean as possible when checking the level, little bits of dirt can be awful for your pump/rack.
 

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98 E320 sedan
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42 Posts
Discussion Starter · #18 ·
Ditto on taking the belt off and checking all components.
I wonder what ATF was used by AAMCO ?
I bought all my own stuff. it was shell 134 or something but it was spec for benz. I was going to use maxlife but didn't know what nag1 ment. they said they had ben fluid because they aays have benz in for rebuilds which is $4000 for trans rebuilds and they paint them so no one can say something diff but $600 more has lifetime of car warranty.
 

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98 E320 sedan
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Discussion Starter · #19 ·
Power steering fluid comes to mind then. How is your steering fluid level? Remember to be as clean as possible when checking the level, little bits of dirt can be awful for your pump/rack.
level is good and looks clean that's the 1st I checked. my brake fluid is clean looks almost new container and booster as well must of been replaced but it says lucas on it. my motor is near mint in looks. like brand new I will try to get pics up when I can .
 

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2017 Ram EcoDiesel, 2014 GLK 350, 2013 BMW R1200GS KC
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Forget your transmission! It works normal, the rpm vs. road speed is correct, and you had it serviced with an approved fluid.

Do as several members have advised you and take the serpentine belt off and examine every pulley for excessive play and roughness while turning it.

Whatever small "leak" you think you have might just be accumulated dirt and oil residue. After you have all your other little problems solved take a jack and some engine cleaner to a carwash. Lift your car, spray the suspected areas with degreaser and then power wash the entire bottom of your engine and engine bay. Then drive it for a few days and check.

You say you are an engineer and have 20 years experience working on cars. You need to approach things a little more methodical just as you do at work. A car is a car and a Mercedes is not all that different.
 
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