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PostPosted: 06 May 2018, 10:44 
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Joined: 12 May 2017, 21:15
Posts: 72
Location: Liberty, MO
Well, I've had a string of bad luck on outboards.

I purchased a 1978 Johnson 35 hp motor last month. It starts up great and shifted well on the muffs. However, when I took it out on the lake, it slips out of gear at about 15 mph or so. It feels like I'm hitting a stump. I believe the issue to be a clutch dog. It seems like that was a real issue with this model of lower unit.

After doing some research, I'm not quite confident enough to get in to the lower unit to change the clutch dog. The bearing housing pull intimidates me a bit and I'm most worried about getting everything back together. Additionally, it looks like a new gear set runs about $300. My thought is, at that price it would be easier and not too much more money to find a used lower unit. BUT, I've scoured the interwebs and haven't found a single compatible lower unit.

Three questions:

1. Honestly, how difficult is it to get into the lu and change the clutch dog? I'm decently mechanically inclined, and don't mind doing most of my own work.
2. Does anybody happen to have a working LU for this motor sitting around?
3. Does anybody have a secret source for used LU's that I haven't found?

Thanks guys!



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PostPosted: 06 May 2018, 12:30 

Joined: 02 May 2008, 21:15
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Location: So .maine
do you have a picture of the motor I think I had 1 with a bad head


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PostPosted: 06 May 2018, 12:46 
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Location: Liberty, MO
hardwatergrampa wrote:
do you have a picture of the motor I think I had 1 with a bad head


Sure thing, here is a pic. Image


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PostPosted: 06 May 2018, 12:54 

Joined: 02 May 2008, 21:15
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Location: So .maine
mine was a evinrude long shaft ill try to check to see if I still have it this week is yours long or short


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PostPosted: 06 May 2018, 12:57 
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Location: Liberty, MO
That would be great, I appreciate it.

This one is a long shaft, so that would likely work.


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PostPosted: 06 May 2018, 12:57 
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Joined: 15 May 2010, 00:38
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Location: Central Florida
Post the model number of your engine.


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PostPosted: 06 May 2018, 13:03 
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Joined: 12 May 2017, 21:15
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Location: Liberty, MO
Pappy wrote:
Post the model number of your engine.


Thanks, will do when I get home.

Off the top of my head, model 35EL78R. Will update for sure when I get home.


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PostPosted: 06 May 2018, 15:26 
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If so that would indeed be a 1978 electric longshaft. Take a good look at the powerhead and see if that engine looks like it has been overheated at all. Reason I ask is that in the 1978 vintage there is a plastic water tube coupler about half way up in the exhaust housing that melts and will NOT seal properly again. That part has been obsolete for quite a number of years as well. Was a kind of an Achilles heel for that engine and that design as well as internal and external lower unit designs changes rapidly. From around 1982 on up that engine and gearcase was pretty much bulletproof.


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PostPosted: 06 May 2018, 19:46 
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Joined: 12 May 2017, 21:15
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Location: Liberty, MO
Figures I found one of the only bad Johnson’s out there.

The powerhead seems to be in great shape. The block is very clean, no flaking paint or anything. It pumps water pretty strong as well. It seems to run well excepting the lower unit issues.

Thanks for the heads up though, I’ll be sure to keep an eye out for that issue.

A guy has to fish, so to this point I’ve just been idling around the lake to my spots.


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PostPosted: 06 May 2018, 21:24 
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Joined: 15 May 2010, 00:38
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Location: Central Florida
If it has not been overheated and that coupler melted then you still have a good engine. Did not mean to be misleading. The powerheads were and still are pretty much bulletproof. When the gearcase issue is resolved please note that there is a shift adjustment at the base of your shift handle on the side of the engine that can help you from having that issue again.


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PostPosted: 07 May 2018, 00:43 

Joined: 17 Aug 2016, 22:49
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What is the fix for that obsolete water tube coupler if it is melted?


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PostPosted: 07 May 2018, 10:00 
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Joined: 15 May 2010, 00:38
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Have not looked for a fix. Usually not worth it as the powerhead/inner exhaust has to come off to get to it.


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PostPosted: 07 May 2018, 16:43 

Joined: 17 Aug 2016, 22:49
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Thanks for the reply.


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PostPosted: 08 May 2018, 20:45 

Joined: 02 May 2008, 21:15
Posts: 452
Location: So .maine
haven't had time will try in the morning and seeif I can get model no. this motor did over heat


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PostPosted: 09 May 2018, 12:17 

Joined: 02 May 2008, 21:15
Posts: 452
Location: So .maine
maybe some 1 can tell if it will fit ser #j30elcrr mod # is e600 4748 have pictures on my phone but don't know how to post them ill have the grandson do it this weekend


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