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Mingo
 
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Last Login: 7/2/2009 2:29:43 PM
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| I have a 01' Evinrude 250. When trimming the motor down (before it gets to the two pistons), the motor is bouncing. I talked to Jack Wills about it and he said to tighten up the nut where the streering tube slides through (where the engine and transom brackets connect). I tightened it up, but it is still bouncing? Does anyone have any ideas? Could it be the seals in the trim pump or the nylon busings where the trim piston connects to the motor? Thanks in advance, Ryan
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Sailfish
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Put a little grease on the ram. The seal may be dry. Also, pump a little grease into the fittings on the tilt tube. Just my opinion, but tightening the nut on the tube would increase friction and cause more bouncing. If the grease doesn't work then try loosening the nut.
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Dealer for www.stickitanchorpins.com and Sea Tow Located in Navarre just north of the bridge.
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Grouper
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What happens is corrosion in the bushings around the tilt tube. The engine then sticks some. When the trim unit pulls the engine down, the engine jumps down to the ram then stops until the ram pulls on it again. Usually tightenning the tube nut will cause more friction to make the trim unit pull on the engine the entire time. The engine normally would be freely moving so it would rest on the trim ram while it was moving down instead of the ram having to pull it. The quick fix is to tighten or loosen the tilt tube nut. If either does not work, then you will need to look at the bushings. If you need to do something with the bushings, you will need to support the engine with a hoist to be able to remove the tilt tube without the engine falling.
Davlor Marine, LLC mobile marine repairs, maintenance, and installations 850-777-7303 www.davlormarine.webs.com
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Mingo
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Last Login: 7/2/2009 2:29:43 PM
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| Thanks for the replies. I greased the ram and put grease in the two grease fittings on the front and it didn't seem to help. I will loosen the nut back up, I didn't really think about the friction thing but that does make sense. I gues the next thing I will do is pop the C-clips out of ram bushing and see if I can get it out and clean/grease it real well. Will the lock bracket on the motor support it enough to pull the ram bushing out? Or must it have a hoist supporting it? It only bounces on the way down, before it hits the two pistons. It also trims up fine (probably because you have the weight of the motor acting against it). I guess the resistance from the pistons on the way down slows it down enough to where it is not sticking anymore.
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Grouper
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The support locks will be good to support for the trim ram bushings, but for the tilt tube bushings you will need to support the engine.
Davlor Marine, LLC mobile marine repairs, maintenance, and installations 850-777-7303 www.davlormarine.webs.com
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Sailfish
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Just a thought. Is the system low on fluid?
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"Just cause it's new, doesn't mean it's worth a Damn."
Pensacola, Fl
Custom 23ft Mako Pilothouse w/ twin DF-140 Suzuki's
162 Scout w/ C-90 Yamaha
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Mingo
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| Here is where I am at. I loosened up and tightened the nut on the tilt tube, nothing. I watched the motor when it is trimming down and there appears to be a lot of slop in the tilt tube. So I am going to lean towards the bushings are gone. Second question, my trim switch stuck the other day and the pump got extremely hot. It seems to work fine now, but is there any chance this could be the cause? I put new fluid in the trim unit, so that rules out low trim fluid. Any other ideas?
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Trigger
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| Ryan, Got any pics of the boat since you finished it. It's a nice piece. You gotta show it off a little bit. Boo
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Mingo
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Last Login: 7/2/2009 2:29:43 PM
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| Can the tilt tube be removed without having to take the trim and transom brackets apart?
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Grouper
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If you put some wood under the skeg and support the engine to not move too much, you can remove the tube. The engine will be able to go backwards at this point. If you are supporting the engine (with an engine hoist), then you will take care of the engine falling back. When you go to put the tube in, the you can move the engine to align the holes. you may have to use the trim some to fine tune the alignment, but usually you do not.
Davlor Marine, LLC mobile marine repairs, maintenance, and installations 850-777-7303 www.davlormarine.webs.com
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Mingo
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Last Login: 7/2/2009 2:29:43 PM
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| I changed the tilt tube bushings and the problem still exists. I am thinking it is the trim pump. Now when trimming, the pump goes from fast to slow at random. I guess if the pump is letting fluid skip through, then this could cause the engine to bounce when trimming down. Any thoughts?
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