Hi all
Keep getting let down by marine engineers so wondered if any one
here may be able to HELP!
My engine starts ok, runs ok upto 1800revs but dies after that, it was
doing it only under power but now seems all the time.
One engineer thought it was fuel pump diapragm (its not split) just showing
signs of wear. still waiting for a new one.
I've had carbs off and spent hours cleaning them, they were it bit
mucky with crystals from old petrol, i found 2 sml jets blocked but
all are very clean now. put them back on expecting to have solved prob
but still the same!
it seems to me that number 2 and 3 spark is weak, changed over coil
packs and still the same.
So i need to know whether it could be the Stator or something else and
also how do you test a Stator?
Any help would be gladly received.
cheers mike
It may be something simpler like a blocked air valve in the fuel tank. If you have a plastic tank the obvious sign is the sides of the tank being sucked in.
I had a very similar problem on my old boat and it turned out to be muck blocking the airvent.
BF
cheers Bob for that but nothing as simple i'm afraid.
Tried 2 tanks, changed fuel line and bulb etc etc etc.
It has fresh fuel.
cheers mike
My engine doesn't have an air filter - does yours? Is it blocked?
If it isn't lack of air it is prob fuel - so maybe one of the jets (main prob as idle jet sounds ok) - but to have all 3 or 4 go is a little weird!
Have you tried new HT leads? You can measeur the output of the stator \ regulator and compare with the service manual.
I thought that my stator \ regulator was gone and it ended up being the battery - have you tried a new battery - a bad battery \ earth \ connection could cause all sorts of weird issues.
Rob
Just a thought
If you can get the engine started and rev it, as it starts to die give the primer bulb on the fuel line a good squeeze and see if the engine picks up.
If it does it would suggest a fuel pump problem.
Good luck
Dave
Hi, I also have a Mercury 60 HP ( 1987: 4 stroke) and think I had the same problem years ago and it was the primer bulb/tank problems.
Have a good mate at Salterns who I know will diagnose this problem so if you e-mail me we can maybe get this sorted for you.
I have had my Trigger and Stator replaced (expensive job) and as far as I can recall this does not sound like the same problem although I am no mechanic so could be wrong.
Good luck and keep me informed as am happy to be of assistance.
Freddie.
Sorry, just remembered that my engine was fine when just idling but would cut out when I opened up the throttle, ie: needed more fuel, (primer bulb/tank probs) so maybe your problem is not the same.
Apologies if I am confusing you.
Hi All
Thanks for the advise and help from people.
In the end it was something very simple but no one
had suggested (not even marine engineers!) that too
much air could be getting in to the system!
Even though i'd had carbs off twice before i hadn't
even thought about checking the O rings on the carb to
manifold, one set is hidden until you take the spacer plate
off which is just held on by 2 plastic inserts. Why didn't i
do this before? I've spent hours on this and then found last
night that all 4 O rings were damaged! 3 had bits out of them
and 1 just squashed to death! Thanks to Niggle i now have new
O rings (not right ones but will do till get some) and started engine
and runs perfect. Probably need to get it tuned as someone
adjusted all the screws on the carbs! (not me someone i paid!!!)
Thanks again...... Mike
ps. I must have the cleanest 2002 carbs now as i've cleaned them
3 times in a week!