ashtead
Well-Known Member
Has anyone replaced the carb and is there anyone to lookout for if going down this route ? I just thought it might bolt on but welcome some views before investing time and money.
Mercury 3.3 carb replacement
- Thread starter ashtead
- Start date
northwind
Well-Known Member
What's wrong with it?
I am somewhat dubious of this current trend to "replace the carb" , when it probably just needs cleaning or adjusting
VicS
Well-Known Member
Just pushes on and is secured with a clamp ITYWF but the fuel supply and controls ( throttle and choke) will also have to be connected
But as northind asks , "Why?"
complete repair kits are available ( order the correct one against the serial number of your engine) if needed
for example
ashtead
Well-Known Member
Thanks both I was just thinking it might be way forward if cleaning doesn't solve on basis I could spend a lot on repair kit in vain attempts to restore the health .
northwind
Well-Known Member
Honestly, take it off the engine, find an old tray and slowly take it to bits, if you want take pictures at each stage of taking it apart, however there will be parts diagrams available which will help with reassembly, or ask here. Then use some spray carb cleaner to clean through the jets, and reassemble.
The carb on a small outboard is a really simple device, and very little can or does go wrong with them, the main issue is going to be the jets can get blocked with old fuel deposits.
Once you have done it once, you with then be able to do it again in the future.
Putting a new one on is a real sledgehammer to crack a nut.
Over the years I have owned loads of different small engines, never needed to do anything other than a strip down and clean.
Outboard "engineers" seem to favour either replacing it or ultrasonic cleaning it, both of which seem like cop out responses to fixing simple issues. Dumping the carb whole into an ultrasonic cleaner is a lazy way of earning money IMHO, and doesn't necessarily reach the parts needed.
What are the symptoms you are facing with it? Is it a two or 4stroke engine?
seumask
Well-Known Member
Had our apart several times to clean jets and honestly its not very complex. Taking it apart wont take much longer than putting a replacement on. Hardest bit is putting the float valve back. Do it over a small tray so you don't lose any bits.
ashtead
Well-Known Member
Thank you for views-it’s a 2 stroke so will have a go at removal and using the cleaner -it just seems to me an annual task .
northwind
Well-Known Member
Do you run it dry when you have finished using it? I. E. Turn the fuel tap to the off position and run the fuel out of the carb?
Do you drain the tank when you have finished with it at the end of the season?
Both of the above will help keeping the carb clean, as leftover fuel can gum up the jets if left to sit in the carb.
ashtead
Well-Known Member
Yes do the running dry trick . I now have another outboard so time to try to restore the 3.3 to life hopefully.
Malish
Well-Known Member
This may not be exactly what you seek but the value is quite something.. others are available. For me the import duties £4, PO handling charge £8
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US $26.31 46% OFF|Boat Motor Outboard Carburetor For Tohatsu 2 Stroke 3.5hp 2.5hp Outboards 3D5 03100 3F0 03100 4 3F0 03100|Carburetors| - AliExpress