Volvo DP-SM water in oil

Joined
Aug 30, 2021
Messages
10
At the end of the season (yesterday), I went to change my oil in my outdrive. A volvo
DP-SM. When I drained the oil it was milky greyish. There was no evidence of metal chips. I change the seals in the 3 oil plugs every year and have never had a problem. Any ides for how to diagnose the issue?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,344
Ayuh,..... Welcome Aboard,..... Do a pressure/ vacuum test on it,.....
 

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
13,655
And use soapy water around seals & look for bubbles…I have to do the water pump shaft seal on my Cobra this winter…it was last re-sealed in 2006…so I can’t complain too much!!!
 

cyclops222

Captain
Joined
Mar 21, 2024
Messages
3,139
Did you carefully inspect each of those seals for damage ? Might have installed a bad one ? I did one time. Magnifying glass showed a flat spot on the O ring. I do CHECK the daylights out of any suspicious parts.
 

BRICH1260

Lieutenant
Joined
Jul 6, 2011
Messages
1,402
Possibly a propeller shaft seal going bad. You need to pressure and vacuum test on the unit to see exactly where the leak is coming from.
 
Joined
Aug 30, 2021
Messages
10
Possibly a propeller shaft seal going bad. You need to pressure and vacuum test on the unit to see exactly where the leak is coming from.
So the vacuum/pressure tester is like $300. Then I would need the puller and tools to replace these seals. Not sure it's worth it or I should just take it to a mechanic.
 

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
13,655
I think it's worth having a pressure and vacuum tester, because some seals are not that hard to replace but there are some where you might need a mechanic, esp if the drive won't easily come apart for repairs.
 

kingsfisherman

Petty Officer 2nd Class
Joined
Feb 22, 2006
Messages
111
I have had water in the drive oil a few times, I made a pressure testing adaptor and bought a vacuum tester. Also bought the spanner tool to remove the retaining ring to the prop shafts to replace the seals. Also have had to replace the shift actuator double lipped seal as well.
 

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