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Author Topic: Alternator oil leak  (Read 922 times)
Steel cowboy
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Moving ahead so life won’t pass me by.

Spring Hill, Fl.


« on: October 11, 2015, 07:21:51 AM »

I replaced my alternator last week and now I've noticed an oil leak on the engine side of the alternator. When I pulled the old one out I noticed some scratches on the o-ring seat towards the bottom of the engine case. My question is I greased the surface were the o-ring rides before installing it. Should I be using some sort of sealer on the back side of the alternator housing when I reinstall it with the new o-ring?
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da prez
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. Rhinelander Wi. Island Lake Il.


« Reply #1 on: October 11, 2015, 08:08:58 AM »

  If all surfaces were clean and no burrs , you may have nicked it putting it back in. It would be best to pull it and check the current O-ring for a nick and note the location. Then check the surface for a scratch and clean if needed with superfine sand paper. If you use a sealer , make sure it is non-hardening.

                                     da prez
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MarkT
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« Reply #2 on: October 11, 2015, 08:20:16 AM »

When I installed my Compufire oversized alternator on Deerslayer I had to cut out a window in the O-ring seat to provide clearance to pass the alternator between the frame and the engine.  Even with an extra O-ring on the fwd face it still leaked oil.  That was a dozen years ago or so.  Maybe 6 years later I replaced it due to the oil messing up the brushes.  That time I used JB Weld to fill in the window, but also added a skin of oil so it wouldn't get fixed to the aluminum.  Still leaked. Now recently I replaced the alternator again because of the oil on the brushes.  This time I added liquid gasket sealer on the O-ring and also on the alternator where the o-ring is, and forward of it.  No more leaks and that has been several months now.
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Steel cowboy
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Moving ahead so life won’t pass me by.

Spring Hill, Fl.


« Reply #3 on: October 11, 2015, 01:58:42 PM »

Thanks Mark, the o ring was cut probably during the install. I used the old one with some silicone rtv in the o ring grove and around the o ring. The old o ring is holding so I'm happy.
I still ordered a new o ring from action Honda which I'll hold on too. I'm taking the old alternator to get rebuilt as a spare.
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PA_1999Valk
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Elizabeth, PA


« Reply #4 on: October 11, 2015, 03:49:45 PM »

Buy a new o-ring.  Back out the alternator far enough to install the new o-ring.  I had the same problem with the o-ring on the alternator trying to maneuver it into the small opening.  My leak went away.

Carl
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