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Go Back   SailNet Community > On Board > Gear & Maintenance > stripped thread in lower unit oil fill hole
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Thread: stripped thread in lower unit oil fill hole Reply to Thread
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Topic Review (Newest First)
03-12-2013 10:25 AM
Alex W
Re: stripped thread in lower unit oil fill hole

Yes, I was thinking about the engine oil. Sorry, I didn't notice that this was about the gear oil. No dipstick there!
03-12-2013 07:36 AM
suntrek
Re: stripped thread in lower unit oil fill hole

Thank you all for info and tips!
03-11-2013 09:31 PM
Minnewaska
Re: stripped thread in lower unit oil fill hole

Quote:
Originally Posted by Alex W View Post
You can avoid this problem by sucking the oil out of the dipstick in the future (rather than using the oil drain hole). This is how the oil is changed on most inboards, but it works on outboards too.
I think you are thinking of engine oil. 90w lower gear unit oil would be tough to suck out and you can't warm it up.
03-11-2013 07:47 PM
Alex W
Re: stripped thread in lower unit oil fill hole

You can avoid this problem by sucking the oil out of the dipstick in the future (rather than using the oil drain hole). This is how the oil is changed on most inboards, but it works on outboards too.
03-11-2013 07:42 PM
Sea Dawg
Re: stripped thread in lower unit oil fill hole

When tapping the new threads use a blob of grease on it to capture the metal shavings.
03-11-2013 12:15 PM
msmith10
Re: stripped thread in lower unit oil fill hole

I checked out the link, Minne. That does look like a good system.
03-11-2013 11:39 AM
sterilecuckoo58
Re: stripped thread in lower unit oil fill hole

When going to a larger bolt, consider a headless stud for Allen wrench. That would eliminate the head clearance problem in the well. But I don't know if the head is needed to secure a gasket though. On mine - well, the one I have removed and installed on a 9.9 Johnson and now retired, just had a slot in the top of the bolt/stud, there was no head, but maybe there was a seat at the bottom of the hole.
03-11-2013 07:04 AM
Minnewaska
Re: stripped thread in lower unit oil fill hole

I've come to like Time-Sert substantially better than heli-coil. Whichever you use, you'll need to be sure you don't leave metal shavings in the gear case from drilling out the current hole. The Time-Sert, will then return the hole to its original size/thread.

http://www.timesert.com/
03-11-2013 01:15 AM
suntrek
Re: stripped thread in lower unit oil fill hole

Thanks Mark!
I was thinking about the same thing, but I hoped for easy solution. There is nothing easy with this kind of stuf.
03-11-2013 12:57 AM
msmith10
Re: stripped thread in lower unit oil fill hole

If there's enough thickness in the threaded female portion of the housing you could try a helicoil. Otherwise you could drill and tap for larger bolt size then either place washers under the bolt head to fill up that 3/16 gap, or alter the head of the new plug so it fits down in the recess (grind down at machine shop or weld smaller head on plug so it matches the original). Given the usual softness of those housing castings, I think I'd take it to a machine shop and get their opinion.
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