* IF You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!If you have any problems with the registration process or your account login, please contact rinnasharksac@gmail.com

Latest topics
» Sea Angling Rigs
Tue 19 Feb - 12:57 by Admin

» Go Fishing on line mag
Mon 11 Feb - 9:04 by Admin

» BASS Reg, 2019
Tue 5 Feb - 17:54 by Admin

» 2019 Fixtures
Sun 13 Jan - 20:55 by barry

» Ling Rocks Cork
Fri 21 Dec - 7:59 by Admin

» Tides Ireland
Wed 19 Dec - 14:58 by Admin

» How to catch black Bream
Sun 16 Dec - 10:04 by Admin

» Book of Rigs
Sun 16 Dec - 9:45 by Admin

» Sat 15th dec Xmass competition dunmore dock 3 to 6pm
Mon 10 Dec - 22:36 by barry

» A few photos from the Rinnashark sac Juvenile 2018 Christmas Competition in Cheekpoint
Mon 10 Dec - 22:27 by barry

» Small Boats video Thanks Ian Stubbs
Sat 1 Dec - 18:24 by Admin

» 2018 Master Angler & Longest Fish Winners
Wed 28 Nov - 11:29 by Sharky

» Master Angler 2018
Wed 28 Nov - 8:32 by Sharky

» 2019 Small Boats Competition Dunmore East
Tue 13 Nov - 21:03 by barry

» ****** 2019 Dunmore East Small Boats******
Mon 12 Nov - 21:45 by barry

» In the land of black and white
Fri 9 Nov - 14:47 by Admin

» Alan Mul 2016
Fri 9 Nov - 9:27 by Admin

» Club Changes and new aims to bring anglers together Please take five mins to read
Wed 7 Nov - 21:44 by barry

» 2018 small boats pictures
Tue 6 Nov - 12:04 by Admin

» Martin Halley full results
Wed 31 Oct - 23:27 by barry

» Martin Halley 2018 video
Thu 25 Oct - 21:45 by barry

» Martin Halley 2018
Mon 22 Oct - 19:31 by barry

» 2019 Small Boats Competition
Mon 8 Oct - 9:47 by Admin

» 2019 Tides (Tidal Variations)
Mon 8 Oct - 9:38 by Admin

» 2018 Juvenile Fixtures & Results
Wed 26 Sep - 20:33 by Sharky

» Boat fishing pics 2018
Sun 9 Sep - 17:45 by barry

» Shore Comp and Fishing pictures (Click Pic to see full image)
Sun 9 Sep - 17:39 by barry

» Latest issue of off the scale mag
Thu 26 Jul - 9:41 by barry

» JUV PIC 2018 (click to see full Photos)
Wed 4 Jul - 7:33 by barry

» Jimmy Smith 2018
Wed 4 Jul - 7:27 by barry

Philip Griffen
Doing it all wrong Dad
Alan & Jamie
Tramore Bass NO2

Discovering where a fault lies on your outboard

Go down

Discovering where a fault lies on your outboard

Post by Admin on Tue 26 Apr - 12:45

The Following information is the routine I use in discovering where a fault lies, it is quite generic and applies to most outboard motors, once you have read the information and found that a fault is still residing on your engine please let me know and we can move forward onto other possibilities you dont need to press accept until you are happy with the answer and you can keep the question open until you are happy.

First you need to diagnose what the fault could possibly be, First checks to always undertake

would be a spark test and compression test, this will rule out an spark problem and a serious

mechanical failure.

The spark test should always be done with safety in the forefront of your mind

the flywheel is spinning and can do a lot of damage,

remove the plugs from the cylinders get a good source for grounding them on the engine block and make sure that they stay grounded, if

the spark is not allowed to go to ground it can feed back through the ignition system and damage

the Ignition, crank the engine and ensure that all cylinders have a bright blue spark,this test

can also be done with an inductive timing light(with plugs left in) or a "glass" spark plug

which plugs between the HT lead and the plug, whilst doing the spark check with the plugs removed

you can put a compression tester onto each cylinder and check compression, compression should

always read over 100psi and within 15psi of each cylinder, if the readings fall outside of these

figures then the chances are you will need to have the engine overhauled as some internal wear/

damage has occurred, an engine with all 3 cylinders at 90psi can still idle ok but will not develop

the HP required to run efficiently,if the spark and compression tests come back good then you can

assume that the fuel system is where the problem lies, firstly check that you have good fuel and

not contaminated old fuel, modern fuels only have a shelf life of a couple of months before they

start deteriorating so if you are using last years fuel this can cause problems,if the fuel is good

then your next thing to check is that all fuel lines up to and including the engine are in good

condition with no cracks splits or poor connections,change the fuel filters as they can block and

restrict fuel flow, check your fuel pump diaphragms as any splits or holes will cause an engine to

run inefficiently, if you have a hole in a diaphragm the fuel will usually pass straight into

the crankcase and "over fuel" the engine this is because most fuel pumps are vacuum driven directly from

the crankcase pressure. If all these checks are sound then move onto the carb/s the carbs will need to

be removed, stripped and cleaned, I use a product by Quicksilver called Power tune to clean the carbs

this product dissolves salt residue and the "varnish" just spray it all over the carb components leave for

a few minutes and spray them clean, I dont recommend the use of high pressure air lines as this can

sometimes push a blockage further into a recess and cause more problems, if the blockage is very bad then

you could take the carbs to a specialist who has an Ultrasonic Cleaner In an ultrasonic cleaner, the object

to be cleaned is placed in a chamber containing a suitable ultrasound conducting fluid . The main mechanism

of cleaning action is by energy released from the creation and collapse of

microscopic cavitation bubbles, which break up and lift off dirt and contaminants from the surface to be

cleaned. The higher the frequency, the smaller the nodes between the cavitation points which allows for more

precise cleaning. The bubbles created can be as hot as 10,000 degrees and 50,000 lbs per square inch, but

are so small that cleaning and removal of dirt is the main result.

Whilst the carbs are off check the Reed valves on the inlet manifold for cracks breaks and even a reed missing completely the reed valves are to help control when the fuel is drawn into a cylinder if one has broken you will need to investigate to ensure that no internal damage has happened to the engine this will usually show up on the compression test with an abnormally low reading ie below 100psi.

When you reinstall the carb/s if you have 2 or more you will need to ensure that the carbs are synchronised this is vital to the idle of an engine basically when you put the carbs back on and adjust any idle you must ensure that all the carbs butterfly's are completely closed at idle, this ensures that a cylinder is not trying to run faster than the others or vice versa.


Number of posts : 919
Age : 71
Location : WATERFORD
Reputation : 6
Registration date : 2008-03-12

View user profile http://www.rinnasharksac.net

Back to top Go down

Back to top

- Similar topics

Permissions in this forum:
You cannot reply to topics in this forum