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Johnson 7.5 Seahorse Questions

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kurtnord
New member
Username: kurtnord

Post Number: 1
Registered: 03-2008
Posted on Sunday, March 16, 2008 - 12:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

What do I have here? Johnson 7.5 seahorse serial number 1528368. What is the gas mix used? I need a manual. Any value to the motor?

Thank you in advance for your help.
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hicksabishag
New member
Username: hicksabishag

Post Number: 1
Registered: 03-2008
Posted on Sunday, March 16, 2008 - 10:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi- the only 7.5 HP Johnsons were 1956(model AD10) 57(11) & 58 (12) They used 24:1 fuel:oil mix This can be thinned out to 30:1 or so with the new hi-grade 2-cycle oil.
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andrew
Moderator
Username: andrew

Post Number: 926
Registered: 11-2001


Posted on Friday, March 21, 2008 - 08:58 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Kurtnod,

Manuals available one the MarineEngine site.

This site, OldMarineEngine is really for antique inboard engines, not outboards.

Thanks.
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hankham
New member
Username: hankham

Post Number: 1
Registered: 08-2008
Posted on Saturday, August 23, 2008 - 01:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi, I just bought a 57 Johnson model # AD11 motor runs fine but one of the freeze plugs blew out & I thought that I maybe soder a plug in its place. Is this possible. I have no info in my old repair manual.
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bruce
Senior Member
Username: bruce

Post Number: 181
Registered: 07-2002
Posted on Saturday, August 23, 2008 - 09:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Epoxy might be another route. See AOMCI.org
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ernie
Senior Member
Username: ernie

Post Number: 862
Registered: 01-2002


Posted on Saturday, August 23, 2008 - 09:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Freeze plug? All I can think of is a plug about 3 eights of an inch in dia at the top and bottom of the water passage in the head.
The other part that looked like a freeze plug was where OMC put the serial number and it won't matter if it isn't there.
Just about all parts for that motor are still available from a good OMC dealer
Or send me a pic. I most likely have one.
Hope this helps
Ernie
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ernie
Senior Member
Username: ernie

Post Number: 864
Registered: 01-2002


Posted on Saturday, August 23, 2008 - 10:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Is it one of these 3 plugs? If so OMC should still have them. If not a good automotive machine shop should have them. You could also glue them back in with a good epoxy like JB weld.
If you remove the head to replace them the headgasket is available on the other part of this web page which is MarineEngine Dot Com
headgasket click here


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hankham
New member
Username: hankham

Post Number: 3
Registered: 08-2008
Posted on Monday, August 25, 2008 - 09:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

|Hi Guys,
And thanks for the info you Guys nailed right on the head. Thanks alot
Hank
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peter.piccirillo@gmail.com
Visitor
Posted on Wednesday, April 21, 2010 - 12:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a 1981 Johnson Seahorse 7.5 Model #J8RCIC
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charue
Visitor
Posted on Tuesday, June 22, 2010 - 12:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi,I have a 1959 johnson seahorse model 1880860, it is has remote controls right now.I would like to purchase a tiller handle control.If someone could help me out that would be great! I am wondering if some other make or models would interchange? thanks
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bruce
Senior Member
Username: bruce

Post Number: 228
Registered: 07-2002
Posted on Tuesday, June 22, 2010 - 06:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Try AOMCI.org for outboard motor help.
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andrew
Moderator
Username: andrew

Post Number: 1071
Registered: 11-2001


Posted on Saturday, July 31, 2010 - 01:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Charue,

You should verify that model number. It probably isn't 1880860 . Is it an 18HP? The possible model numbers are shown here:

old Evinrude model numbers

could it be 18803 ? That would be an 18HP 1968.

Thanks.
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Bill Peters
Visitor
Posted on Sunday, April 17, 2011 - 01:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi i have a johnson 7.5 seahorse motor and i want to refinish it but i need to know where i can get decals for it.it's a model ad-12(58) and it runs like a new one.Help please
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bill peters
Visitor
Posted on Sunday, April 17, 2011 - 02:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

never mind i found them at AOM and salvage company for 39 bucks
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johnmjose
Visitor
Posted on Saturday, May 21, 2011 - 04:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am having problem keeping engine running. Fires real good when I put starter fluid - shuts down quickly. I removed line that runs to carb and pumped the gas tank - fuel seems to be moving fine. Any suggestions, especially if I think next move is to take carb off? Thanks!
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johnmjose
Visitor
Posted on Wednesday, May 25, 2011 - 10:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

OK... Going to remove my carb on the old Johnson 7.5 seahorse... ANY SUGGESTIONS or HINTS before I begin!!?>
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Drew Croy
Visitor
Posted on Friday, June 28, 2013 - 01:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I just bought a Johnson SeaHorse 7.5 outboard.
Model AD-12
Serial 1672933

(Any idea what year this us?)

Tiller is broken. Where can I get parts for this thing? Seller says runs fine but no way to change gears with handle broken. It looks like they "fixed" it many times over the years but I'd rather just find a new/used handle for it.

If you could point me in the direction of a website that offers these old parts I'd appreciate it.
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ernie
Senior Member
Username: ernie

Post Number: 1692
Registered: 01-2002


Posted on Friday, June 28, 2013 - 08:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

www.aomci.org is a good place to start
AD-12 is a 1958
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Randy b
Visitor
Posted on Monday, August 12, 2013 - 08:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have a Jonson 7.5 that's blowing exhaust out the water tube and no water I can blow back trough the "pisser" and it's open I believe the water pump is working? I'm lost though

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