Pitting on driveshaft

abgarza

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Nov 22, 2010
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1987 Johnson 90...

I need to ask...is this driveshaft a goner?
 

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flyingscott

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Take a wire brush or steel wool and penetrating oil and clean it up, then put up a pic looks like mostly surface rust but hard to tell.
 

abgarza

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Nov 22, 2010
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Thanks. I will definitely do that when I get home. I have open house tonight...just here at my desk waiting for parents to start dropping by. I was thinking surface rust too, but where the pinion bearings looks a little bit iffy.
 

flyingscott

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Thanks. I will definitely do that when I get home. I have open house tonight...just here at my desk waiting for parents to start dropping by. I was thinking surface rust too, but where the pinion bearings looks a little bit iffy.


Hard to tell, clean it until it is shiny then put pics
 

racerone

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Dec 28, 2013
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38,578
That shaft is scrap !!!.-----Post pictures of other bearing surfaces / gears.-----Water will do that sitting on bearings for long periods.
 

jakedaawg

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Jun 26, 2012
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Agree w/ racer. My question was hopeing this was a replacement shaft. In my humble opinion it all needs to come apart and get inspected/replaced. If the drive shaft bearings were rusted, being at the top, that means all the races and bearings are most likely toast.
 

abgarza

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Nov 22, 2010
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37
Thanks guys. I've got a new set of gears waiting. I was hoping for the best, but looks like the lower unit is getting a complete rebuild. Going to order all new bearings, and start the hunt for a good used driveshaft.
 

abgarza

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Nov 22, 2010
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I have no idea what I'll do with it...but i found a good used for 275. That sound about right?
 

abgarza

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Nov 22, 2010
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For the sake of my learning, what caused the death sentence verdict. Is it pinion area or both parts?
 

Faztbullet

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Mar 2, 2008
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15,931
Where is pinion bearing runs....you would be better to list this unit on fleabay for parts,sell the new gears and get a SEI lower unit..From looks of shaft every bearing,thrust washers,shims on drive shaft,gears and forward bearing in housing will need replaced. You will need to take to a dealer and have shim height measured dou to new bearing and gear and shaft.New bearings and washer are around $200 plus the $275 for a used shaft aint worth it.
 
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racerone

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Dec 28, 2013
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Agreed, this is not the same as installing new sparkplugs.----------These lower units are " precision stuff "and require knowledge and experience to get it right.----------New gears must be properly shimmed or it will go " pooff " again.---------Best to look for a good replacement unit.-----Cheaper too.
 

abgarza

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Nov 22, 2010
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37
I thought so.

While I'm still learning about the boat mechanics, I am very familiar working on engines/drivetrains. I've rebuilt engines from a bare block to drag strip ready. Change rear gears, never had the need or chance to crack open a tranny though. I know they are not the same, and that's why I really want to learn about the ins and outs of the boat engine.

My dad owned this boat before me, and he bought it from one of his coworkers. As this was Dad's first boat, I don't ever recall seeing ANY maintenance done on it. After I bought it from him(about 5 years ago) the first thing I did was put it in shop for a checkup and told the shop owner to do what was needed to get her safe and seaworthy. Shop kept her literally ALL summer, so I can only assume the condition she was in after sitting for so long. When I got her back, I took her on the water and was left stranded at my second stop because mechanic did not put the cotter pin back on the prop shaft and of course the prop nut spun off, dropping the prop in 4 feet of water. (Before you ask, it was after a long drift).

The next mechanic I took it to was because the jack plate had leaked hydraulics(thank you first mechanic) and when I tilted the motor the steering arm caught the transom and blew out the seals on the main piston. So...mechanic number two fixes the hydraulics on the jack plate, and then proceeds to take the mallet to the pin to remove the tilt/trim unit, essentially mushrooming it. He then calls me up and says he can't do it because the pin is mushroomed. I could have kept using the boat, I know, but had to put it in storage shortly after as I was going through a divorce. I had to downsize from my f150 to a smaller vehicle and couldn't move my boat.
I prepped boat for storage and there she's been. I finally got back on my feet, moved in with my girl(that loves to fish) and got myself another truck. I brought the boat back in may of this year and started working on rewiring the boat, replacing the tilt/trim,(which I did even though the mechanic couldn't/wouldn't) and getting her running again, and boy did she run well. Had her going getting on the bay fishing 2-3 times a week

You can understand how I've lost confidence in shops doing my work, and I know how bad stealerships will gouge me. For those reasons, I;d rather do as much of the work that I can myself.

After spreading out the cost of the repair over two paychecks, it's softened the blow of the big ticket price, and of course, I didn't realize that I was going to need rebuild practically the entire LU. I'm this far in, and I've found a good mechanic from a marine shop that everyone swears by. I spoke to him today and he'll shim the driveshaft for me for $60.00.

I hear your advice to just get good rebuilt LU,and I know that you guys speak from experience, and I am taking in everything you guys offer. Believe me, that would be the easiest route to take, but at this point, I'd rather just finish the job. I hope you all can see where I'm coming from and not hold that against me.
 
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abgarza

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Joined
Nov 22, 2010
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37
Just a quick update. I ordered a good freshwater driveshaft, all the bearings, I already have the gears and seal kit. Is there anything I can do while i wait for the parts to come in? I don't want to pull the bearings until I have the new set. I want to make sure everything matches up.
 
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