Reply
 
Thread Tools Search this Thread
 
Old 06 May 2013, 17:44   #1
Member
 
Country: UK - England
Town: Felmersham
Boat name: Kiss my bass
Length: 5m +
Engine: Mariner 40 2stroke,
Join Date: May 2013
Posts: 22
Any mariner experts here ?

Hi,
This is my first post as just registered due to looking for answers on the net, and this site came across as one that may be able to shed some light on my problems.

I run a 1999 mariner 2 stroke, ex rnli engine, a few weeks ago, about 2 miles offshore on a trip out it went wonky, I mean, it died, started instantly on the first pull, but would not rev up properly without spluttering and dying, I ran back in on very low revs and it seemed fine, would idle perfect, just not rev up under load.

Into the mechanics it went, he stripped the carbs, found minute parts of muck and small droplets of water, but next to nothing by all accounts, cleaned them up, changed plugs, leads and caps as reckoned I had a weak spark, everything seemed normal so he tested it in water and the engine ran perfect, returned the boat, I went out yesterday, exactly the same problem, about 2 miles out again ! Yet it ran perfect until that point, did not miss a beat, getting back was another story though........ It ran like a bag of sh##e, and got worse the longer it ran, until I was virtually on idle, yet drop it out of gear and it idled perfect, so guys, any suggestions, so far I am thinking, carbs got muck in, stator, timing, possibly engine temp sensor gone wonky and giving the wrong signals to the timing ?.

I am no expert on outboards, but trying to learn so I can fix things myself if that makes sense.

Thanks in advance for any help you may be able to share.

Robert.
__________________

__________________
Kiss my bass is offline   Reply With Quote
Old 06 May 2013, 18:01   #2
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Check fuel system first. It could be drawing air into the fuel line if there's a dodgy connection, or the fuel pump may be defective. Did you try pumping the fuel primer bulb to see if it made any difference?

I'm assuming your tank vent was open?
__________________

__________________
Downhilldai is offline   Reply With Quote
Old 06 May 2013, 18:06   #3
Member
 
Country: UK - England
Town: Felmersham
Boat name: Kiss my bass
Length: 5m +
Engine: Mariner 40 2stroke,
Join Date: May 2013
Posts: 22
Quote:
Originally Posted by Downhilldai View Post
Check fuel system first. It could be drawing air into the fuel line if there's a dodgy connection, or the fuel pump may be defective. Did you try pumping the fuel primer bulb to see if it made any difference?

I'm assuming your tank vent was open?
Hi, thanks, yes I tried it on two different tanks and lines, I also tried pumping the primer bulb, but it was hard and made no difference at all, yes the vent was open.
__________________
Kiss my bass is offline   Reply With Quote
Old 06 May 2013, 18:08   #4
RIBnet supporter
 
jambo's Avatar
 
Country: UK - Scotland
Town: Girvan & Tayvallich
Boat name: Breawatch
Make: Ribcraft
Length: 5m +
Engine: Mercury 150 F/stroke
MMSI: ex directory!!
Join Date: Sep 2008
Posts: 5,785
RIBase
Quote:
Originally Posted by Downhilldai View Post
Check fuel system first. It could be drawing air into the fuel line if there's a dodgy connection, or the fuel pump may be defective. Did you try pumping the fuel primer bulb to see if it made any difference?

I'm assuming your tank vent was open?
Got to agree with DHD. As you can see I have a Mariner the same happened to me 2 years ago would not go above 2000 revs but sounded okay. it was the diaphram. Try it I think that could be the culprit, surprised your mechanic did not test for it.
Hope you get it sorted.
__________________
jambo
'Carpe Diem'
Member of the ebay Blue RIB cover club
Member of SABS ( Scottish West Division)
jambo is offline   Reply With Quote
Old 06 May 2013, 18:11   #5
Member
 
Country: UK - England
Town: Felmersham
Boat name: Kiss my bass
Length: 5m +
Engine: Mariner 40 2stroke,
Join Date: May 2013
Posts: 22
Quote:
Originally Posted by jambo View Post
Got to agree with DHD. As you can see I have a Mariner the same happened to me 2 years ago would not go above 2000 revs but sounded okay. it was the diaphram. Try it I think that could be the culprit, surprised your mechanic did not test for it.
Hope you get it sorted.
I will have a look at that next time I go to the boat, thank you, I was surprised to hear he did not test the engine under load as it was on a trailer not ten metres from the slip and I explained it was only problematic under load when it went in to him. He is also a mariner mechanic. Mine does not sound ok at all, unless it is on idle or from cold, when warm under load it sounds like it is missing.
__________________
Kiss my bass is offline   Reply With Quote
Old 07 May 2013, 02:06   #6
Member
 
Festinghouse's Avatar
 
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,398
RIBase
Send a message via Skype™ to Festinghouse
i had this twice with my old merc 25 - both times it was the cdi unit. before spending any money on parts get a multi meter, then search the net for the correct tests to carry out on the cdi, the stator and the trigger. you may however need to run your engine until the fault occurs before running the tests .Boatinfo - boat brochures and manuals for boats and marine engines! this has been a useful site for me.
__________________
"Life may often suck, but the alternative is unacceptable"
MMSI Sticker

Member of S.A.B.S. (Lancashire Division)
Festinghouse is offline   Reply With Quote
Old 07 May 2013, 02:27   #7
Member
 
Country: UK - England
Town: Felmersham
Boat name: Kiss my bass
Length: 5m +
Engine: Mariner 40 2stroke,
Join Date: May 2013
Posts: 22
Quote:
Originally Posted by Festinghouse View Post
i had this twice with my old merc 25 - both times it was the cdi unit. before spending any money on parts get a multi meter, then search the net for the correct tests to carry out on the cdi, the stator and the trigger. you may however need to run your engine until the fault occurs before running the tests .Boatinfo - boat brochures and manuals for boats and marine engines! this has been a useful site for me.
Thanks, I have spoken to black dog marine and they kindly emailed me all the test procedures to go through for the stator, coil, etc, I have a meter so that's possible to do, just wanted to get an idea on what I should be looking at first, it sounds like I need to be spending a day or two going right through everything until I find the issues.
__________________
Kiss my bass is offline   Reply With Quote
Old 07 May 2013, 03:45   #8
Member
 
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 894
is it an early rnli obm? if it is it may have been missed when the water trap filter was changed , they were modifid to stop dirt dropping into the clean fuel side of the filter.the stator should be a red one if not i would change itcheck your spark plugs are they the same colour?
__________________
uncle al is offline   Reply With Quote
Old 07 May 2013, 04:06   #9
Member
 
Budgie1's Avatar
 
Country: UK - England
Town: Dorset
Boat name: BlueTube
Make: XS500
Length: 5m +
Engine: Mercury Opti 75hp
MMSI: 235098668
Join Date: Nov 2012
Posts: 197
My stator just stopped working when engine was running and didn't fire again until it was replaced so not convince it is the problem, the earlier ones where troublesome and the later (red) ones far more robust. Wouldn't change one until sure I was quoted 500 plus for new on my Merc 60hp, bought Mariner 60hp doner engine used stator off also changed gearbox and a few other bit but still have many parts if of interest to anyone
__________________
Budgie1 is offline   Reply With Quote
Old 07 May 2013, 05:02   #10
Member
 
Country: UK - England
Town: Northampton
Make: RibTec
Length: 5m +
Engine: Outbaord mariner 75
Join Date: Apr 2011
Posts: 506
My stator did exactly what your engine is doing.
ran fine untill it was under load.
then would not do more than 2000rpm without dieing.
ok at idle in gear.
__________________

__________________
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 19:36.


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