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Old 26 August 2010, 06:24   #1
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My Tohatsu help thread!

Hello everyone, i recently purcahsed a used 25/30 Tohatsu 2 stroke. I thought i would start a thread which i can ask multuiple questions in , rather than begining a new thread every time i have a new question regarding my motor. I will take some pictures tommorow and use a paint program to try and point out and explain as best as i can any problem areas.

The motor starts and appears to run fine, my first question is about the prop.

When i spin it slowly by hand, it seems as though something is bent somewhere. It's like if you were to spin a bicycle wheel that is buckled. There is a small gap between the prop and the leg, and the gap goes bigger and smaller when it spins. Any idea's? It also jiggles a little bit in the direction of where it's bolted on.
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Old 26 August 2010, 06:46   #2
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Hi mate thanks for the reply on my recent post.

Sounds like the prop may have hit some hard ground or somthing and like you say slightly bent the drive.

Im not to great on outboards as only just started boating.

The prop has hit somthing i would say, im sure some more experienced members will help out..

Cheers.
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Old 26 August 2010, 07:10   #3
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I'm pretty sure it has taken a hit somewhere as there is a chunk out of the Skeg. If it's safe to run as it is, i'll probably leave it for the time being, but if it can cause serious issues, then i will address it asap..
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Old 26 August 2010, 07:17   #4
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If you got a lump out the skeg it sounds like it's hit something. Any lumps out the prop or one blade at a different angle to the rest?

What to do is tape a piece of wood or something to the leg, so it's really cliose to the tail end of the hub and canlt move, then turn it. If thre gap that open & closes is a lot bigger than the one at the gearbox end, you may have a bent shaft.

If it's not touching the gearbox at all, you might get away with it for a while but the imbalance will shake the grearbox to pieces eventually * gve yopu a rough noisy ride. (although going by your other paost that may not be an issue! )
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Old 26 August 2010, 07:37   #5
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The first thing is to check if it's the Prop that's running out or the prop shaft.

Take the prop off and put to one side.

Get a knitting needle or a long pointer and some Plasticine/blue tack. Using the Plasticine/blue tack, stick the pointer on to the gearbox housing or somewhere that doesn't move. Then position the pointer on the end of the prop shaft (not the thread). You can then rotate the shaft and look for gaps between the pointer and shaft. If it's an even gap (doesn't get bigger and smaller) when you turn it then the problem is with the prop. If the gap gets bigger and smaller then the problem is with the shaft and it will probably need truing up or replacement.

Whatever's wrong I would get the oil checked in the gearbox as vibration is the death knell for seals and bearings and I wouldn't run it unless you were stuck somewhere for risk of further costly damage.

If it's going to cost you an arm and a leg for repair then any good insurance policy should cover you for underwater/leg damage.

Post back you results.
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Old 26 August 2010, 09:25   #6
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Quote:
Originally Posted by Hightower View Post
If it's going to cost you an arm and a leg for repair then any good insurance policy should cover you for underwater/leg damage.
Not if the damage was there when bought:

Quote:
i recently purcahsed a used 25/30 Tohatsu 2 stroke
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Old 26 August 2010, 11:16   #7
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Depends if you've used it yet. You'd have very little come back if you accepted after a Sea trial and would be looking for "good will" from the seller. If someone came back to me after buying a boat I knew was solid, moaning about a bent prop shaft then I'd tell em to take a hike.

Have you used it yet Bus Boy? Did you Sea Trial it before purchase?
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Old 27 August 2010, 01:19   #8
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No i haven't used it yet. I need to pick up some 1 way valves for my Zodiac after i missplaced the originals.

Due to my remote location, i bought the motor interstate, and then had it freighted to me. After patiently waiting for 4 months, i was unable to find anything in my area, so i had to look at other options.

I will take the prop off today and report back. I also have some photos i need to upload which show a bit of play in the lower section of the leg. There is a bit that moves up and down when you select F/N/R, and the round housing around it has quite a bit of movement, and makes a bit of a sloshing noise when you move the leg around. I'm hoping it's just a few worn bushes or something a not something serious....

Looks like a may have bought a bit of a dud motor which is unfortunate. All i can do i guess is hope that with the right tools and the right advice, i can fix anything that needs doing, and get the motor in reasonable shape without having to spend a whole lot of money on it.
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Old 27 August 2010, 05:10   #9
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That looseness could be caused by an out of balance bent shaft buggering up the bearings then. Good luck with your tests, please report back your findings.
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Old 28 August 2010, 03:36   #10
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Ok so i got the lower section of the leg off today. I checked out the water pump, impellor which ever it is while i was there, and the gaskets on it were completely buggered, and there was a lot of crap built up around it aswell. So i'm going to need to replace that while the legs off.

When i spin the long shaft (the one that goes up to the motor) the prop shaft spins, but instead of just rotating, the outside point of it (where the nut goes on) it's moving around in quite a large circle, obviously indicating that something is bent somewhere.

What should i do? Take it to a mech, or is this something i could fix myself for less?
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