Topic: 18hp Evinrude powerhead removal – Antique Outboard Motor Club,Inc

This topic has 12 replies, 6 voices, and was last updated 4 years, 10 months ago by fleetwin.

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June 26, 2020 at 5:04 pm #206789
melugin
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Have model 18902 Evinrude with water leak on exhaust side and/ or welch plug on head. Trying to go about removing powerhead. Have most everything loose, except for 7/16″ head bolt from under the powerhead in front of the driveshaft. Seems like I’m going to have to completely remove motor from clamp and swivel assembly to do this. Am I going in the wrong direction? I’m about ready to complete this job with a 2lb. sledge.
June 26, 2020 at 5:13 pm #206792
frankr
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Nah, I’ve removed lots of those things. You say 7/16″, are you sure? Many of those things were a Phillips head screw. But some were a special screw with a small hex head. I’m thinking 3/8″ or even 5/16″ hex, but could be wrong.
June 26, 2020 at 7:43 pm #206800
melugin
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No phillips screws here. Five small hex heads, one 7/16″ on one side and then this one in the front, accessed from beneath.
June 26, 2020 at 8:35 pm #206807
need2fish
Participant
I think you’ll find there are 7, and yes with a 3/8 head where you’d normally have 7/16″. One of them hides under the vertical magneto advance rod , toward the drive shaft, and the other on the opposite side of the exhaust housing.
June 26, 2020 at 10:15 pm #206810
frankr
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A narrow, short 1/4″ drive socket on an extension should fit up through there to get that difficult one, whatever the heck the size is.
June 26, 2020 at 11:10 pm #206814
Bob Wight
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frankr wrote:

A narrow, short 1/4″ drive socket on an extension should fit up through there to get that difficult one, whatever the heck the size is.

I’ll second what Frank said. On my ’72 Evinrude 25hp, I had the same front powerhead bolt that’s difficult to access. I used a 1/4″ drive socket, extension and universal joint to get at the bolt and get it out.

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."
June 27, 2020 at 1:08 am #206817
Mumbles
Participant
Flip the motor upside down and shine as light down there. You will see the head of the bolt or screw and you can easily reach it using a 1/4″ drive setup and going down the port side of the motor. Long extensions really help here and an extendible magnet can be used to pick it out.
June 27, 2020 at 8:49 am #206823
fleetwin
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frankr wrote:

Nah, I’ve removed lots of those things. You say 7/16″, are you sure? Many of those things were a Phillips head screw. But some were a special screw with a small hex head. I’m thinking 3/8″ or even 5/16″ hex, but could be wrong.

OK, well I feel dumb…What little screw are you talking about here??
June 27, 2020 at 9:27 am #206827
frankr
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Not exactly a little screw, as I seem to remember it is a 5/16″ bolt with a special small head, that you have to sneak a small socket up between the exhaust housing and steering bracket to access. I’m sure you have been there and done that.
June 27, 2020 at 9:30 am #206831
melugin
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Spent an hour with 1/4 drive extensions and hex, twelve point, etc. sockets yesterday before consulting AOMCI. At least it is not a saltwater motor. Today, I’m going to bite that old bullet and remove motor from clamp assembly to get the offensive bolt out in the daylight and it might just fall out on its’ own. Thank you for your support.
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