gearcase drain plug leak

[pstephens46]

There is a new gasket/oring. Don't know for how many models but assume the flat red gasket was creating issues. The screw becoming loose was the issue I noticed. The update bulletin was posted on another forum.

[TownsendsFJR1300]

Plz post your model #.

There is a FLAT, GASKET that goes in with the drain bolt, NOT an O-RING.

With the top screw still installed, you can remove the lower drain bolt, install the proper flat GASKET and re-install. Good and snug.

Re-check after a days outing..






.

[rodbolt17]

unless they stripped the thread and it wont tighten it is not a thread issue.
I have seen the sealing surface on the plug damaged by a hand impact.

[panasonic]

Take it back to the dealer and tell them not to call you until it is fixed properly and not leaking a speck. When you pick it up ask them for the exact details of the repair on paper. I fear they buggered the threads on the case and would think they would have already replaced the plug if it had bad threads.

But fooling with it yourself at this point it may give them the excuse that you somehow had something to do with it.

My two cents.

[DennisG01]

This one shouldn't be rocket science. Either the male or female threads are buggered up and the plug is, for lack of a better word, wobbling in the gearcase such that it doesn't stay tight and loosens up from vibration, or there's an issue with the sealing/mating surface.

Have you tried tightening the plug? Does it tighten or "rock" a bit?

The plugs should have the same threads and sealing surface so swapping plugs "shouldn't" cause this effect. But I say that without ever even seeing the model engine in question - only saying this from every other gearcase I've ever seen.

Are you positive that the leak is coming from the drain plug and not the vent plug?

[pstephens46]

There was a guy who reversed the two plugs recently. Put the drain screw in the vent hole and vent screw in drain. Hard to imagine a service center doing this. Is it possible they grabbed a screw from another motor by mistake? If that is not the case, something is damaged. The old gasket worked pretty good, the new one should be even better. I would take the screws out and inspect them and the seating areas.

[Tony Sopranzi]

Hi,
I have a 2010 Yamaha 25hp motor. I recently had the dealer do a gearcase
service. The motor came back leaking lube at the drain plug. The dealer replaced the red washer on the plug with a black washer which he said was an improved product. We talked about the possibility of an old washer still in the
case or damaged threads or gasket seat. Within a few hours after arriving at home, the case was still leaking. I returned to the dealer and asked that the
cause of the leak be identified before doing anything else. One day and a half
later they called to say they used an "O" ring and in that day and a half there was no leaking. When I picked the boat up I fingered the drain plug screw head and there was oil residue on it. The attending employee opined perhaps it was residual. A possibility I thought. Upon arriving home I cleaned the plug with solvent until it was clean. the following morning there was a puddle of lube under the skeg and the plug and skeg wree wet . Any ideas as to the cause? The dealer has been very accommodating but I'm afraid that something untoward may have occurred during the gear case service. Thank you in advance for your professional opinion.
Tony