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Author Topic:   Hydraulic Leak from Tilt-Trim When Lowering

73sport13 posted 11-09-2008 04:00 PM ET (US)
[Report that he observes a leak of hydraulic fluid from an 1998 Evinrude 35-HP motor only when it is being lowered, in spite of installation of] a new back up ring, wiper ring, and main ring. [Seek] any ideas [on how to remedy the leak].
an86carrera posted 11-10-2008 08:55 PM ET (US)
The wiper rings are not the seals they just keep dirt away from the o-rings that are the pressure seals. It only leaks going down because the pressure is on the upper side of the piston then.
Len
73sport13 posted 11-11-2008 07:00 AM ET (US)
All the rings in the top cap [have been replaced] and it still leaks.
Martino posted 11-11-2008 07:14 AM ET (US)
If the seals were OK and installed correctly, then the problem is the shaft. Any sign of scoring or pitting when you replaced the seals?
73sport13 posted 11-11-2008 05:55 PM ET (US)
There was some slight corrosion and pitting [of the shaft]. [I] tried to sand down [the shaft] with 300 then 400 grit the best [I] could.
Martino posted 11-13-2008 06:50 AM ET (US)
I'm sure you are not supposed to, but I have used a brake cylinder hone on the bores, and chucked the other parts in a cordless drill, hit them with progressively finer paper, and polished them with 1000 grit when finished. Praise the Lord, I have had decent results. You have to be careful with the grit, of course.
an86carrera posted 11-13-2008 08:20 AM ET (US)
The O-ring groove in the cap must also be pit free. On the last rebuild I did, the groove was a mess with corrosion, so I had a machinist cut a new groove for it further down the bore since there was room; this was on a Mercury, though. The groove could possibly be filled with a RTV silicone then install the O-ring and let it cure before reassembling.
Or buy a new cap; the Mercury one was about $80.
Good luck
73sport13 posted 11-13-2008 02:59 PM ET (US)
Because the mechanic I called obviously didn't know anything, and because he grooved-up the cap where the seal sits, [I will] probably have to get a new cap.
I had a machinist hone and smooth out [unclear].
Would a tiny bit of pitting [on the shaft] cause [the seal at the shaft] to leak?
73sport13 posted 11-14-2008 06:06 PM ET (US)
bump
A2J15Sport posted 11-14-2008 10:05 PM ET (US)
Are you sure it's not overfull?
"Only leaks on down" is a sure sign. That fluid has to go somwehere.
73sport13 posted 11-15-2008 10:09 PM ET (US)
[Seeks more advice and quickly because he needs to go on a long trip with the boat.]
HAPPYJIM posted 11-17-2008 04:43 PM ET (US)
Replace it then take the old one and rebuild it. Clean up all of the pitting on the shaft and replace all of the seals. You will have a better understanding of how it works and then you will have a spare if needed.

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Author	Topic: Hydraulic Leak from Tilt-Trim When Lowering
73sport13	posted 11-09-2008 04:00 PM ET (US) [Report that he observes a leak of hydraulic fluid from an 1998 Evinrude 35-HP motor only when it is being lowered, in spite of installation of] a new back up ring, wiper ring, and main ring. [Seek] any ideas [on how to remedy the leak].
an86carrera	posted 11-10-2008 08:55 PM ET (US) The wiper rings are not the seals they just keep dirt away from the o-rings that are the pressure seals. It only leaks going down because the pressure is on the upper side of the piston then. Len
73sport13	posted 11-11-2008 07:00 AM ET (US) All the rings in the top cap [have been replaced] and it still leaks.
Martino	posted 11-11-2008 07:14 AM ET (US) If the seals were OK and installed correctly, then the problem is the shaft. Any sign of scoring or pitting when you replaced the seals?
73sport13	posted 11-11-2008 05:55 PM ET (US) There was some slight corrosion and pitting [of the shaft]. [I] tried to sand down [the shaft] with 300 then 400 grit the best [I] could.
Martino	posted 11-13-2008 06:50 AM ET (US) I'm sure you are not supposed to, but I have used a brake cylinder hone on the bores, and chucked the other parts in a cordless drill, hit them with progressively finer paper, and polished them with 1000 grit when finished. Praise the Lord, I have had decent results. You have to be careful with the grit, of course.
an86carrera	posted 11-13-2008 08:20 AM ET (US) The O-ring groove in the cap must also be pit free. On the last rebuild I did, the groove was a mess with corrosion, so I had a machinist cut a new groove for it further down the bore since there was room; this was on a Mercury, though. The groove could possibly be filled with a RTV silicone then install the O-ring and let it cure before reassembling. Or buy a new cap; the Mercury one was about $80. Good luck
73sport13	posted 11-13-2008 02:59 PM ET (US) Because the mechanic I called obviously didn't know anything, and because he grooved-up the cap where the seal sits, [I will] probably have to get a new cap. I had a machinist hone and smooth out [unclear]. Would a tiny bit of pitting [on the shaft] cause [the seal at the shaft] to leak?
73sport13	posted 11-14-2008 06:06 PM ET (US) bump
A2J15Sport	posted 11-14-2008 10:05 PM ET (US) Are you sure it's not overfull? "Only leaks on down" is a sure sign. That fluid has to go somwehere.
73sport13	posted 11-15-2008 10:09 PM ET (US) [Seeks more advice and quickly because he needs to go on a long trip with the boat.]
HAPPYJIM	posted 11-17-2008 04:43 PM ET (US) Replace it then take the old one and rebuild it. Clean up all of the pitting on the shaft and replace all of the seals. You will have a better understanding of how it works and then you will have a spare if needed.