Trim

Dr Doof · 20 November 2011, 20:28

Hello

When I was out today my engine trimmed down on its own every time I accelerated.

I've tried nipping up the manual release but its still the same.

Does anyone have any idea why this would happen?

Thanks

Jizm · 20 November 2011, 20:41

Quote:

Originally Posted by Dr Doof

Hello

When I was out today my engine trimmed down on its own every time I accelerated.

I've tried nipping up the manual release but its still the same.

Does anyone have any idea why this would happen?

Thanks

Do you lose any hydraulic fluid at all?

Dr Doof · 20 November 2011, 20:42

No, no fluid lost.

sburt10 · 20 November 2011, 20:46

What engine is it ?

I think some, Mercs and Mariners for instance have a feature that trims you down if you throttle hard when the engine is raised too high, could it be a problem with this ?

mick · 20 November 2011, 20:52

Same thing happened to mine fluid leaked out so I bit the bullet and am getting them fixed at great expense the seals were worn but it was pitting on the rams that was spoiling the seals so pointless just putting new seals on but it should be ok for sometime when done.

Dr Doof · 20 November 2011, 20:55

Its a Mercury 125hp elpto.

It happened under normal acceleration.

Mollers · 20 November 2011, 20:59

The fluid is bypassing the ram seals, we had the same prob with the BF50. We changed them at work, it was a bit of a faff.

Dr Doof · 20 November 2011, 21:12

Thanks, I'll check the seals.

Boats&Outboards · 20 November 2011, 22:38

Easy things first.

Top up fluid and bleed system (trim down/up then release the cap, top up and retrim until all the sponginess is removed) adding fluid if you can. Then try raising or pushing down engine by hand to see if you have any movement on the ram. Then move into seals etc if still needed. May get lucky and find it just needed bleeding

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

jezza2011 · 21 November 2011, 07:43

and dont forget the trim switch.
check its all ok.
Mine wore out and raised /lowered the engine on its own.

Boats&Outboards · 21 November 2011, 08:34

Quote:

Originally Posted by jezza2011

and dont forget the trim switch.
check its all ok.
Mine wore out and raised /lowered the engine on its own.

From what I've read it's not that as you would hear the engine tilting down if the switch was intermittently operating on its own. It appears here that the engine simply loses its hold under load.

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

PeterM · 21 November 2011, 09:55

My opti used to 'trim' down if it reved over a certain amount and was in the 'tilt' range on the tilt/trim.... if that makes sense.

It was a bugger running in shallow water when it did this

Jizm · 21 November 2011, 13:15

Quote:

Originally Posted by PeterM

My opti used to 'trim' down if it reved over a certain amount and was in the 'tilt' range on the tilt/trim.... if that makes sense.

It was a bugger running in shallow water when it did this

Makes sense to me.

Similar thing on the inboards that won't start in not in the trim range....

9D280 · 22 November 2011, 09:09

In the meantime, move the "manual" trim pin up to a suitable hole as a "get you by".