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Old 18 August 2014, 02:18   #1
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Power tilt and trim

Power tilt fault
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Old 18 August 2014, 02:23   #2
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Just took the new rib out a 6.5 humber with a 115 efi mercury and i think there maybe a problem with the power tilt and trim.it will till fully up and down fine but when under power the engine pushes down to half on the trim gauge on its own.dos it just need the fluid topping up or is it something more sinister???
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Old 18 August 2014, 02:54   #3
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When you say it pushes down to half on the gauge, do you mean that the engine is physically moving down, or just the indication on the gauge that changes?
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Old 18 August 2014, 03:00   #4
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The engine moves down
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Old 18 August 2014, 03:44   #5
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Try topping up the fluid first. Sounds like air in the system. My thoughts are how did the air get there. Can you see any fluid anywhere. Where did the fluid go. Could be internal seals but that's rare
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Old 18 August 2014, 03:48   #6
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Try topping up the fluid first. Sounds like air in the system. My thoughts are how did the air get there. Can you see any fluid anywhere. Where did the fluid go. Could be internal seals but that's rare
Could be the manual release valve that's either not tightened up or leaking.
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Old 18 August 2014, 03:52   #7
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Dont seam to be any fluid leaking anyware ill try topping up and see what happens where is the manual release valve?
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Old 18 August 2014, 09:46   #8
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Usually on one side or the other (duh) towards the bottom of the rams. Usually a largish flathead screw affair. Don't have your head beneath the motor while loosening.

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Old 19 August 2014, 13:37   #9
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Well just pulled the manual release valve out and it has two o rings on it and also a groove on it for what looked like another o ring so googled it and there are pictures of the valve with 3 o rings.dont know if there are diffrent types with 3 and two o ring.
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Old 19 August 2014, 13:38   #10
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Old 19 August 2014, 13:40   #11
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Tryed to remove bottom o ring and it snaped and my o ring set dont have that size in it bet ill have to buy the whole valve.ill try a hydrolics place tomorrow
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Old 19 August 2014, 13:55   #12
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Tryed to remove bottom o ring and it snaped and my o ring set dont have that size in it bet ill have to buy the whole valve.ill try a hydrolics place tomorrow

If it's a Mercury i.e.American, I'm guessing that the "O" rings will be imperial.
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Old 19 August 2014, 13:58   #13
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Yeah thats what i thought but theres metric bolts on the engine
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Old 19 August 2014, 15:08   #14
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Yeah thats what i thought but theres metric bolts on the engine
In that case owt could happen
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Old 19 August 2014, 19:46   #15
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I'd be guessing that's your problem. Local motor factors should have an o ring to fit
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Old 20 August 2014, 02:39   #16
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I think the other o ring must be stuck inside
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Old 20 August 2014, 09:55   #17
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Is it one of the rebadged Yamaha motors? If so, I'd think the O-rings would be metric along with the hardware.

Shouldn't be too hard to find suitable replacements though: Put a caliper on the groove to get the ID, and then on the O-ring itself (or what's left of it) to get the thickness of the material. From there, you should be able to match up with O-ring specs online. You'll have to do a bit of guesswork on the missing one, but you're just isolating reservoirs of hydraulic fluid, so it's not all that critical.

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Old 21 August 2014, 00:59   #18
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So ive now fitted the 3 new o rings and i dont no how successful its been the ram will now lift the motor with me stood on it but creeps back down so im not sure if the thrust of the engine is less than my weight if u know what i mean if it is all ahould be ok.ill water test this weekend and see what happens
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Old 21 August 2014, 03:26   #19
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So ive now fitted the 3 new o rings and i dont no how successful its been the ram will now lift the motor with me stood on it but creeps back down so im not sure if the thrust of the engine is less than my weight if u know what i mean if it is all ahould be ok.ill water test this weekend and see what happens
Shouldn't creep back down, not in a short time anyway. Summats still not right. Have you tightened up the manual release fully? I'd also be wondering where that missing "O" ring is, it could be stuck on a seat causing a poor seal.
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Old 21 August 2014, 08:20   #20
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Yeah thats what i thought but it did have 18 stone of brother standing on the outboard had a look in the hole where the manual release valve gos and couldent see anything in there.if u lift the engine with no one standing on it it will stay there all week
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