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Old 03 March 2008, 15:58   #11
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Yep,
with the further info it does look like a trim problem. It should stay exactly where you put it no matter what speed you are doing. Looks like either a leak or the manual tilt is sightly open or passing as has been said.
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Old 03 March 2008, 16:28   #12
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Could it be that the manual tilt screw is not fully closed and is allowing the engine to trim down. What happens if you fully tilt the engine up does it slowly drop down?
Richard
So you are saying check the manual release valve to see if its fully seated?

No problem when out of water or stopped the engine stays up and doesn't drop. It only seemed to drop yesterday when speed was increased..
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Old 03 March 2008, 17:31   #13
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Originally Posted by ciaranp View Post
So you are saying check the manual release valve to see if its fully seated?

No problem when out of water or stopped the engine stays up and doesn't drop. It only seemed to drop yesterday when speed was increased..
Its worth checking it is fully closed and seated.
May be worth tilting the engine fully up and then pulling down on it for a while and see if it starts to come down.
Just a silly thought you could not be accidently be pressing the trim button if its on the throttle?
Does it only trim down when you are above a certain revs?
Richard
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Old 03 March 2008, 17:37   #14
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Originally Posted by rickuk3 View Post
Its worth checking it is fully closed and seated.
May be worth tilting the engine fully up and then pulling down on it for a while and see if it starts to come down.
Just a silly thought you could not be accidently be pressing the trim button if its on the throttle?
Does it only trim down when you are above a certain revs?
Richard
No not pressing bu accident.

it stays up until i get past a certain revs and then trim back in..

must check if manual release is fully closed if its not that don't know what it could be, its a strange one..
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Old 03 March 2008, 17:47   #15
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With the engine stopped but ignition on trim the engine out and then slowly move the throttle to maximum and see if it trims in on its own.
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Old 03 March 2008, 17:55   #16
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With the engine stopped but ignition on trim the engine out and then slowly move the throttle to maximum and see if it trims in on its own.
so engine stopped iginition key turned on trim out, then with engine still stopped push throttle to see if it trims or stays.

what will this then tell me?
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Old 03 March 2008, 18:52   #17
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so engine stopped iginition key turned on trim out, then with engine still stopped push throttle to see if it trims or stays.

what will this then tell me?
It will tell you if the trim wires that run down the throttle have become damaged and are shorting causing the engine to trim down.
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Old 04 March 2008, 04:35   #18
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It will tell you if the trim wires that run down the throttle have become damaged and are shorting causing the engine to trim down.
ok will try this as well as the manual release next time i'm near the boat..
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Old 04 March 2008, 12:19   #19
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It will tell you if the trim wires that run down the throttle have become damaged and are shorting causing the engine to trim down.
Rickuk3 you may be right in what your saying as it not happen until i increase throttle, its fine until i push on throttle.

I spoke with a Suzuki outboard Technician today and he said the same
it may be a short due to wires rubbing together at throttle,
cause in a slow speed the engine doesn't trim inwards its only when i increase throttle and push it forward that the trim drops in indicating the wires may short when throttle pushed forward past a certain point.


He Also said that it was probably not a hydraulic issue cause if it was the engine would trim out (not in) with the pressure of water pushing it back (trimming out) and if the hyraulic fluid was low there would be no pressure to keep it trimmed in against force of water when cruising a speed.

He said as did rickuk3 to try the trim on land, ignition on trim out a little and push on throttle to see if it happens.
must carry out a few tests the next day i'm near the rib.
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Old 04 March 2008, 13:22   #20
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He Also said that it was probably not a hydraulic issue cause if it was the engine would trim out (not in) with the pressure of water pushing it back (trimming out) and if the hyraulic fluid was low there would be no pressure to keep it trimmed in against force of water when cruising a speed.
This doesn't make sense, think there has been a misunderstanding or the service engineer doesn't know an outboard from a wheelbarrow! :-)
The trim is a ram that pushes the engine up away from the transom. It doesn't come back as valves stop the fluid returning. The force of an outboard at speed is pusing the engine back towards the transom and in case of any leaks or passing valves the outboard will only trim in. The only way it can trim out is if the pump is running to push fluid through the system and expand the piston holding the engine.
The most likely explanations are a short, holding the trim button in by accident or a leak/passing valve. All can cause the motor to trim In but only the first two can cause it to trim out.........
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