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#1
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300SDL: loud grinding transmission 722.321, noise in P and N position
I have lately some strange noises when I start in P and shift through N (in order to get to D). The sound is horrible and loud like grinding gears.
Other wise the car shifts great and drives great. This noise is not always there but I had it several times now and I can't ignore it any longer. This sound scares me. Reading in a manual I found this: light grinding noise noise in 'P' and 'N' position: "This condition is normal if a 'rolling' noise of front planetary gear is heard. If noise seems too loud, or if in doubt, a similar vehicle should be used for comparison" I found this statement odd because it doesn't tell what causes the problem of the loud noise. Another connection between P and N might be the starter lock-out switch? Is there anyone in the forum who knows about this noise? I'd need help. Martin |
#2
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No one? Is there no one who knows this P and N grinding noise?
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#3
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If it Swims like a Duck...
Loud Grinding Noises signal self destruction to me...
(But,I don't have a 722.3 Tranny...AND when I did,it NEVER did that!)
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'84 300SD sold 124.128 |
#4
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I assume you are asking for "guesses" as there is no way to give you specific advice with that information. Check the easy stuff first - shift rod bushing and transmission mounts.
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o) |
#5
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Loud noises of any kind are often a bad sign in any transmission.
Did you check you linkage to see if the bushings aren't worn out or linkage is damaged? Is your transmission selector moving smoothly in all ranges?
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 |
#6
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Quote:
Noise is only heard in P and N- when the car is not moving at all. The car drives fine and shifts excellent without any noise as soon as it is moving. This grinding noise doesn't occur all the time. I think the noise is not there when engine is cold. But often if the engine/trans is warm. I have checked the transmission fluid level and it was a bit high but nothing serious that could possibly cause this noise? Transmission selector is moving smoothly. I haven't checked the transmission linkage. I will check his tonight. Thanks for any input. Martin |
#7
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Quote:
I will check shift rod bushing and transmission mounts and report back. Can the noise in P and N occur with a bad bushing and trans mount condition? |
#8
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Martin, hopefully it's shift linkage bushings. My SDL eats them.
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o) |
#9
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Relief valve noise? Front pump?
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Gone to the dark side - Jeff |
#10
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Quote:
Unfortunately I couldn't find anything that doesn't look good from the outside. |
#11
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I don't know how the relief valve or the front pump sounds.
If it sounds like metal grinding teeth of a gear box (as if you shift with a manual transmission without the clutch!) then it is the noise I am talking about. Again the weird thing is that the sound is only there in P and N position ...NOT when I am driving- in D the transmission sounds fine and it shifts nicely as before. |
#12
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Drain the tranny and torque convertor and then pour the fluid through a coffee filter and look for solids, (metal and fiber), then drop the pan and look for bigger pieces of the same. In this case more is not better.
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Dave 1983 300D Daily Driver |
#13
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Quote:
I am still questioning where this sound in P and N comes from and why it is not always there. Just in case...If I can't get find any reason other that some inner parts of the trans are damaged what is my best choice: 1) buy a reman trans and install myself. What tools, how much time? 2) what is the best address/source for a reman transmission? Martin |
#14
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ReMan Tranny
1.Mercedes may have one...Call a couple of dealers to compare prices.
2.A member here does ReMans, in Atlanta. J. Hodgman of "Blue Ridge MB / AMG East" (404)-805-1357 3.OR, http://www.peterschmid.com/
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'84 300SD sold 124.128 Last edited by compress ignite; 05-13-2009 at 08:51 PM. |
#15
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Its a grind
I am not a tranny expert but here is my guess. When the trans is in Park or Neutral the pump is disabled. No pressurized fluid is being supplied to the valve body or clutches. The only parts rotating are the converter and the input shaft and the gear attached to the other end of shaft inside the transmission. It sounds to me that the bearing that supports the input shaft is slowly failing and the wobbling shaft grinds the gear mentioned above against other components that are not rotating inside the trans.
If this is the case a complete rebuild may not be necessary as the worn component is at the front of the trans. You might be able to just have those components changed. Thats my two cents worth EddieE 87 300 SDL 325K |
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