Reply
 
Thread Tools Search this Thread
 
Old 20 November 2011, 15:28   #1
Member
 
Country: UK - England
Town: Northumberland
Boat name: Dr Doof
Make: Humber
Length: 6m +
Engine: Mercury 125hp
MMSI: 235082981
Join Date: Oct 2010
Posts: 297
Trim

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
__________________

__________________
Dr Doof is offline   Reply With Quote
Old 20 November 2011, 15:41   #2
RIBnet supporter
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
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?
__________________

Jizm is offline   Reply With Quote
Old 20 November 2011, 15:42   #3
Member
 
Country: UK - England
Town: Northumberland
Boat name: Dr Doof
Make: Humber
Length: 6m +
Engine: Mercury 125hp
MMSI: 235082981
Join Date: Oct 2010
Posts: 297
No, no fluid lost.
__________________
Dr Doof is offline   Reply With Quote
Old 20 November 2011, 15:46   #4
Member
 
Country: UK - Scotland
Town: Glasgow
Boat name: Baby B
Length: 5m +
Engine: Evinrude
Join Date: Aug 2011
Posts: 30
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 ?
__________________
sburt10 is offline   Reply With Quote
Old 20 November 2011, 15:52   #5
RIBnet supporter
 
mick's Avatar
 
Country: UK - England
Town: Wakefield
Boat name: Bouncer
Make: Redbay Stormforce
Length: 6m +
Engine: 2x Honda 90Hp
MMSI: 235025718
Join Date: Jun 2009
Posts: 3,984
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.
__________________
mick is offline   Reply With Quote
Old 20 November 2011, 15:55   #6
Member
 
Country: UK - England
Town: Northumberland
Boat name: Dr Doof
Make: Humber
Length: 6m +
Engine: Mercury 125hp
MMSI: 235082981
Join Date: Oct 2010
Posts: 297
Its a Mercury 125hp elpto.

It happened under normal acceleration.
__________________
Dr Doof is offline   Reply With Quote
Old 20 November 2011, 15:59   #7
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
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.
__________________
Mollers is offline   Reply With Quote
Old 20 November 2011, 16:12   #8
Member
 
Country: UK - England
Town: Northumberland
Boat name: Dr Doof
Make: Humber
Length: 6m +
Engine: Mercury 125hp
MMSI: 235082981
Join Date: Oct 2010
Posts: 297
Thanks, I'll check the seals.
__________________
Dr Doof is offline   Reply With Quote
Old 20 November 2011, 17:38   #9
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
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
__________________
Boats&Outboards is offline   Reply With Quote
Old 21 November 2011, 02:43   #10
Member
 
Country: UK - England
Town: Northampton
Make: RibTec
Length: 5m +
Engine: Outbaord mariner 75
Join Date: Apr 2011
Posts: 506
and dont forget the trim switch.
check its all ok.
Mine wore out and raised /lowered the engine on its own.
__________________

__________________
jezza2011 is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 05:33.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.