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  #1  
Old 05-26-2019, 11:13 PM
CDTurbo001's Avatar
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Location: Campbellsville, KY
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722.3 pump inspection

722.315 out of an '85 300TD. This transmission was making an audible growling noise (think bad unitized wheel bearing in a newer car - not a grinding or harsh noise, just a growl/howl) that corresponded to engine speed, but was drowned out at highway speeds. Was more noticeable inside than under the hood. It needed to come out to replace the pump seal, anyway, so I'm trying to determine whether there's any indicators in the pump or if it could be a plugged filter or bad torque converter.

All manuals I can find say "If front bushing has wear or damage, replace pump." All I see is evidence of light rubbing by the torque converter snout - no apparent damage or severe wear. Opinions?
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722.3 pump inspection-b7ee7e2f-9943-4a75-a8a7-40db220969f9.jpg   722.3 pump inspection-94b0b589-0013-43e8-b0f3-48a263a9cc03.jpg   722.3 pump inspection-ffc78dac-d0a2-42b7-b509-508d00fee81b.jpg   722.3 pump inspection-b1d93f69-8f79-471c-b609-e3f846a0067a.jpeg   722.3 pump inspection-5576ff16-bd6a-4ea2-b532-a5c4084d5a7c.jpeg  

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'82 300CD
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Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red".
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Old 05-27-2019, 06:40 PM
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Did you find the source of the noise? If your transmission was operating fine except for the noise. I'd fix the problem with the noise, any seals you have access to, and replace the filter and transmission fluid. That's what I'd do.
Roddy

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  #3  
Old 05-27-2019, 11:49 PM
CDTurbo001's Avatar
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As explained above: I had to remove the trans. to fix the leak, either way, and if I could find the cause of the noise while I had it apart, all the better.
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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red".
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  #4  
Old 05-28-2019, 03:25 PM
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It looks OK to me - the best check after reassembly is to see if it still pumps within the prescribed specifications (see chap 27 if you can get it - ATSG or WIS info if you can get it - there's also a fair amount of copied info on BW too)

These pumps are pretty simple - pretty stupid - they only have to be good enough to produce the prescribed min main pressure
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1992 W201 190E 1.8 171,000 km - Daily driver
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  #5  
Old 05-29-2019, 09:12 PM
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If the noise is a whine like a bad power steering pump then the source of the noise is the torque converter.
Look it up on line. Torque converter noise.
Roddy

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