Topic: 1957 Evinrude Big Twin 35 hp exhaust leg drain

This topic has 26 replies, 9 voices, and was last updated 5 years ago by Bob Wight.

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May 26, 2020 at 6:40 pm #204079
Buccaneer
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As normal, I found that the exhaust leg drain hole is plugged. Normally I’m
able to chuck a foot long piece of stiff wire (sharpened on the end) in
my drill, and ream out the blockage.
I tried probing first with a mechanic’s pick, but could not find the
hole in the drain cavity. Further cleaning of the cavity, shows why.
There’s some kind of metal piece with a tab, over the area where
the hole should be.
Q. Is this factory?
So for I’ve failed with every attempt to dislodge this metal tab piece,
or even get it to wiggle. There’s not much room in the cavity,
and very hard to “hook” the piece with anything.
Ideas?
Thanks!

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May 26, 2020 at 7:20 pm #204092
dave-bernard
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drill a new hole above the metal piece. new drain hole.
May 26, 2020 at 8:41 pm #204097
Mumbles
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Something probably fell in there and is lodged in tight now. There isn’t much room to start with and I use a drill bit with an extension welded on it to clean these areas out. When it’s filled to the top with crud, it’s like drilling thru concrete. The 9.9/15’s are the worst ones as the drain is in the front and when it plugs up, salt water corrosion splits the case and a big chunk falls off the side.
May 26, 2020 at 8:56 pm #204103
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dave-bernard wrote:

drill a new hole above the metal piece. new drain hole.

In my first photo you see a black marker line. That’s approximately
the bottom of the cavity, and where that stray piece of metal is.
I was thinking of drilling a hole right there, if for nothing else,
so I might be able to pry up on that metal piece.
I may try to rig up a long drill bit and try to drill through,
or dislodge that metal piece from above first……. just thought
I’d ask if at some point OMC started putting that piece there,
to keep the hole from plugging……. if so, they failed!

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May 26, 2020 at 9:00 pm #204104
Bob Wight
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Maybe you could heat up the case real good to expand it just a little bit, and rap on the side of the case to see if it might dislodge?

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
May 26, 2020 at 9:01 pm #204105
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Mumbles wrote:

Something probably fell in there and is lodged in tight now. There isn’t much room to start with and I use a drill bit with an extension welded on it to clean these areas out. When it’s filled to the top with crud, it’s like drilling thru concrete. The 9.9/15’s are the worst ones as the drain is in the front and when it plugs up, salt water corrosion splits the case and a big chunk falls off the side.

I’d love to get that piece of metal out in “one piece” to see if I could ID it,
but I would not count on it.

My dad use to have a drill bit extender……. basically a rod with a coupler on the
end with a set-screw…….. that’s an idea, or I could try welding up something.
I’ve unplugged a couple of those drain holes…… cement-like for sure!

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May 26, 2020 at 9:06 pm #204106
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Bob Wight wrote:

Maybe you could heat up the case real good to expand it just a little bit, and rap on the side of the case to see if it might dislodge?

Bob, that could possibly work, but I’ll try less drastic measures first.
I should have poured some “Lime-Away” down in the cavity over night
to see if it would open up the cement in the drain hole.

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May 26, 2020 at 9:50 pm #204115
labrador-guy
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Buc all BS aside you can real easy ruin that gearcase! Don’t ask me how I know that. I hate that drain, the sand and small stones get in there and it makes cement or darn near cement. I have given up on a couple around here since my drill went a little to far to the side. Not a good thing!

dale
May 26, 2020 at 10:15 pm #204120
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labrador-guy wrote:

Buc all BS aside you can real easy ruin that gearcase! Don’t ask me how I know that. I hate that drain, the sand and small stones get in there and it makes cement or darn near cement. I have given up on a couple around here since my drill went a little to far to the side. Not a good thing!

dale

Maybe using my stiff wire in the drill other other motors was a good idea after all!
The wire didn’t cut as much as grind it’s way thru the grit slowly.

I wonder why OMC didn’t put the drain hole in the side of the gear case right
at the bottom of the cavity (where my mark is) instead of adding on another
2″ of a passage that plugs up? Perhaps the vortex of prop has some function?

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May 27, 2020 at 11:58 am #204154
oldlure
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Your post has reminded me to check mine as the lower unit is currently off.
Yes it’s clogged.
Is the passage a straight 90 degrees?
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