lets see if we can figure out what went wrong. yeah the shifter got me a little l know
one mans junk is another mans treasure…
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The top screw is a vent
Plug remove that plug
As well as the bottom
Fill from the bottom
Till lower unit grease
Flows out of the vent
Hole then tighten
Both screws to snug fit
That's it
The lower gear is missing a snap ring.
The book wants you to take the powerhead off
Oh,my, my hearts skips a beat when it comes to seized hardware on these! Had a head bolt that was one with the block, got lucky with a drill and tapped itout to 3/8 from 5/16. Hate to have to scrap a beautiful old motor for something like that
I love the old outboards. Parts can be difficult enough, but service manual are like unicorns! Any idea where a 20r71s manual could be found?
He puts together very good content and teaches at the same time very good teacher home automotive mechanic jack-of-all-trades.
It failed because the impeller is made for a larger diameter drive shaft.
I had one delivered in an aftermarket kit even though the part numbers were correct…
so don't ignore a loose fit.
There is nothing wrong with the pin sitting on the plate, because they're designed that way.
Inexperienced people try to help by advising to install a new impeller with the rubber vanes leaning in the same direction as the old impeller, not realizing that it's very poor advice, because it could duplicate a screw up.
It's important to install the impeller with the rubber vanes leaning in the opposite direction than what the drive shaft turns when the engine is running which is clockwise when viewed from above.
The proper install method is to have the impeller sitting on the plate with the drive pin in its hole and push down on the housing while slowly rotating the drive shaft clockwise which can be done with an open end wrench on the upper splines, then fasten with anti-sieze on the screws, then replace the o-ring below the splines and then lube the splines with OMC moly lube 327420 or equivalent.
I see zero wisdom in the common dire warnings to use grease or even dish soap as startup lubrication, because every day millions start bone dry because it doesn't take long for them to dry out after using a boat and they function just fine with nothing but water. Plus incorrect lube can do more harm than good because they can destroy rubber.
Overhauling auto engines is a different story because they require proper prelube,
because it takes time for the oil to arrive from the oil pan.
Rod should have a groove the bolt goes thru
Take the bottom bolt all the way out
old video of course but i have owned 2 of these old omc motors a 7.5 johnson sea horse and a 18 horse evinrude ….i learned a lot about old engines early in my 20s on these 2 engines thank god he didnt have a 7.5 the entire power head had to come off to put a water pump in that one and this one he is working on i had a super cringe moment when he was taking apart linkage i was like take the damn dolt out on the lower shaft only its all u have to do to un hook it and honestly tons of people throw these motors away because no parts available bit if you do your research and you have a viable powerhead you can still buy parts for a reasonable price loved both i had hated water pumps on both i love my 2016 tohtsu but i really love knowing more about these engines id bet if now 20 years later id still have the 18 horse evinrude but times change and now i want to fix more than buy kudos to your channel love the content and ive learned a ton still to date wish i knew more 20 years ago
Where did you get the impeller from
You need too keep the water out of the gear box
Drill a new pin hole or have it keywayed