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  #1  
Old 06-04-2021, 04:26 AM
mwjohn63's Avatar
mwjohn63 mwjohn63 is offline
 
Join Date: Sep 2016
Location: Liberty Township, OH
Posts: 26
Default Leaking Water Pump 912ULS

My friend Joe (based at my same airport) has, what looks like, a leaking water pump seal after just over 80 hrs. on the engine. He's talked to Lockwood and sounds like the engine will need to come out to replace the seal. He thought, since everything is out, that he might as well change the top engine mount stand-off (WD-01221-1)...unfortunately, it looks like a 6 month wait list. Anyone out there with the new mount that isn't planning on replacing it anytime soon or getting to that point in the build? Hate to see him miss the whole flying season.
Thanks,
MJ
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  #2  
Old 06-04-2021, 01:39 PM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 181
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Unless the WD-1221 mount is cracked, the SB states you only have to do a 100 hour inspection after the initial check. No reason to be down for 6 months waiting for the updated part if it is not cracked.

John Salak
RV-12 N896HS
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  #3  
Old 06-04-2021, 03:58 PM
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Piper J3 Piper J3 is offline
 
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You might find a hose leak at the water pump instead of shaft seal. Water pump has a boat-load of hoses connected...
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  #4  
Old 06-06-2021, 01:55 PM
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mwjohn63 mwjohn63 is offline
 
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Location: Liberty Township, OH
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Default

Quote:
Originally Posted by NinerBikes View Post
Why don't you list stand off mount in your heading, instead of just leaky water pump, might get more traffic.
Good point
MJ
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  #5  
Old 06-06-2021, 01:57 PM
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mwjohn63 mwjohn63 is offline
 
Join Date: Sep 2016
Location: Liberty Township, OH
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Default

Quote:
Originally Posted by 12vaitor View Post
Unless the WD-1221 mount is cracked, the SB states you only have to do a 100 hour inspection after the initial check. No reason to be down for 6 months waiting for the updated part if it is not cracked.

John Salak
RV-12 N896HS
Yeah, that my be where he ends up. He just thought since it was open that it made sense to replace if he could find one available.
MJ
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  #6  
Old 06-06-2021, 02:00 PM
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mwjohn63 mwjohn63 is offline
 
Join Date: Sep 2016
Location: Liberty Township, OH
Posts: 26
Default

Quote:
Originally Posted by Piper J3 View Post
You might find a hose leak at the water pump instead of shaft seal. Water pump has a boat-load of hoses connected...
I asked the same question, but Joe says he can see it dripping out the weep hole.
MJ
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  #7  
Old 06-06-2021, 02:16 PM
Harvey rv12 Harvey rv12 is offline
 
Join Date: Apr 2015
Location: Olympia WA
Posts: 195
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I have shown a small drip at the weephole on my Rotax 912uls for 700hrs. The engine uses no coolant. The drip signifies that coolant is present.
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  #8  
Old 06-06-2021, 02:43 PM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
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I humbly suggest that you make sure that your water pump is leaking -- it appears to be a big invasive job to reseal the water pump. Check all coolant lines and fittings for possible leaks. Some pump leakage is permitted by ROTAX -- see: https://legacy.rotaxowner.com/si_tb_...o/si912001.pdf
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  #9  
Old 06-06-2021, 11:03 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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Mechanical seals usually do leak a little by design.
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