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Old 22 August 2015, 09:38   #1
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is my gearbox broken?

I was out yesterday with ribtec 1 et al in clew bay. there was a good blow f4- f5. we were heading to clare island and running hard. I was on and off the power and from time to time i would miss time the landings and the prop would spinn without gripping the water. on reaching Clare island whe stopped in the harbour i placed the engine into nutral and then into forward. the revs rose and there was a delay in the engagement of forward gear and then it engauged with a thump. I placed it into nutral and out not get it into forward again. I had reverse. I had a long slow 2-3 kn trip in reverse from Clare Island to Old Head to allow for the recovery of the rib.

with the engine off and in the trottle in forward position (i.e. in gear). When I turn the prop I can feel the cylinders going in and out. When I they try turning the flywheel there is no movement in the prop. with the engine running on muffs and forward gear selected I can stop the prop from spinning with a light stick.

Question is my gearbox broken or it this a problem with the cables out of adjustment?
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Old 22 August 2015, 10:11   #2
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Interesting symptoms..process of elimination ...Drain the gear oil and see if there are metal filings that come out or a silvery colour at the very least. It sort of Sounds like you could have stripped a main forward gear.
Also take prop off and check the splines for stripping and the hub !
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Old 22 August 2015, 12:16   #3
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Sounds like the dog clutch is worn or broken, you have checked to see if the gear linkage engages when you select forward, neutral & reverse. Drop the lower unit put in gear and turn the drive shaft manually and see if the prop shaft turns
Hope this helps
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Old 22 August 2015, 12:31   #4
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if it is the main gear / dog cluch busted is this an expensive repair?
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Old 22 August 2015, 13:54   #5
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Not sure what engine you have but on a V6 parts can be 100 - 300 then you need specialist tools to dismantle and re set. Might be worth looking for a second hand lower unit if yours is shot
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Old 22 August 2015, 16:45   #6
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I pulled the prop as suggested by Matth. The prop shaft and splines are perfect. I also drained the gear oil. there was a small dusting of metal shavings on the magnet on the drain plug. Bit like if you used sand paper to sharpen a lead pencil. The particles were very small and there was not a lot of them.The gear oil was changes 4 years ago ( assuming that the dealer did it as the engine had only 60 hrs on it) the gear oil was olive green in color almost burn smell from the oil. I ran a strong magnet through the oil but it picked up no more shavings.
TSM
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Old 22 August 2015, 16:55   #7
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how to change the gear oil on outboard (etec)

This is a good u tube video on how to change the gear oil in an outboard (in this case an etec) The section on the filings was very interesting to me as it indicates that there are no chips floating around the gear case as i did not find any in the oil or attached to the magnet on the drain plug.

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Old 22 August 2015, 17:23   #8
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Bit of poor luck there Mick. I wonder was your initial guess about the cables correct? It WAS lumpy and you WERE caning it....

How did the Donegal Bay lads fare out?
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Old 22 August 2015, 18:31   #9
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Wilk

The boys from up north did not let the side down. A very pleasent bunch. They went onto Inish Boffin after Clare island. I put the rib into reverse and headed from Clare Island to Old head (south east of Clare Island). At 2 kn average speed I reached old head about 2.5 hr later with a flooded boat but at least I was on the mainland (these rib things are great, dont you know, ye fill them with water and they still wont sink). The SR 5.4 had electrical problems which caused the yam 90 2 stroke to die. I believe it was battery failure. I presume they left the rib on Clare island and returned today with a fresh battery. It was good to run in company and it was my first time in company which originated from Ribnet.

I will get Duffys in Headford (galway) to look at it and give it a service.

TSM
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Old 23 August 2015, 03:04   #10
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Quote:
Originally Posted by two stroke mick View Post
I had reverse. I had a long slow 2-3 kn trip in reverse from Clare Island to Old Head to allow for the recovery of the rib.
That's pretty good going, and kind of a last resort. A rib in reverse is like driving a barge, and I can see why the boat was flooded as the freeboard at the transom end is shallow.

Keep us posted about the outcome on the engine. Also a good opportunity to consider an auxilliary engine.
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