1987 Omc V6 4.3l

[Faerbairn]

I had a mechanic get this engine running really nice. I went out to start it up and it almost started and now it will not start. I have a feeling the spark plugs are fouled. He replaced them and that is when it ran great. What causes fouled spark plugs in such a short time? Can I get a different spark plug (hotter perhaps?) that will not foul as fast?

Thank you for your help.

 

[Gary H NC]

Re: 1987 Omc V6 4.3l

What plugs did he put in?
It should have AC MR43T plugs.
Are you sure you did not flood the engine?
What is your starting procedure?

 

[Faerbairn]

Re: 1987 Omc V6 4.3l

Gary,

Thank you for the reply. I will check on the plugs and replace with the right ones. Yes, I do think there is a chance it flooded, but even after waiting a day it still did not start. That is why I suspect it is the plugs.

 

[danond]

Re: 1987 Omc V6 4.3l

That's not a trimmer motor, it's just a truck engine with marine parts bolted on!

It's probably not the plugs. Even if they're incorrect, the difference from one to the next isn't going to be enough to foul them to where the engine won't start.

If they're fouling, the fuel mix could be off, caused by any number of things. Leaking, poorly adjusted or plugged up carburetor is a very common cause.

Definitely check the plug part number, but be aware that you're very likely dealing with a different issue.

 

[Faerbairn]

Re: 1987 Omc V6 4.3L

Re: 1987 Omc V6 4.3L

Thank you very much! I changed to the proper plugs & cleaned the carb and now it is working beautifully!!!!

 

[Gary H NC]

Re: 1987 Omc V6 4.3l

Cool! At least that was an easy fix!

 

[bruceb58]

Re: 1987 Omc V6 4.3l

What did the old plugs look like? If they were black and fouled you may be back here again once the new ones foul.

 

[Gary H NC]

Re: 1987 Omc V6 4.3l

What did the old plugs look like? If they were black and fouled you may be back here again once the new ones foul.

Hopefully it was the carb cleaning that did the trick for him..

 

[dodgezilla04]

Re: 1987 Omc V6 4.3l

I have the same engine and the carb is wasted. my buddy that owns the boat doesnt maintain it and the carb was rusted and full of junk. so i installed a rebuild kit, cleaned everything as best i could, and it will barely idle and wont run high rpm unless we pump the throttle and use the accelerator pump.
i cant seem to find the carb anywhere.
OMC # 772835
sierra doesnt make a replacement. anyone have any great rebuilding places they've had luck with?
thanks

 

[Gary H NC]

Re: 1987 Omc V6 4.3l

I have the same engine and the carb is wasted. my buddy that owns the boat doesnt maintain it and the carb was rusted and full of junk. so i installed a rebuild kit, cleaned everything as best i could, and it will barely idle and wont run high rpm unless we pump the throttle and use the accelerator pump.
i cant seem to find the carb anywhere.
OMC # 772835
sierra doesnt make a replacement. anyone have any great rebuilding places they've had luck with?
thanks

They have what you need and fast shipping...prepaid label to send your old carb back..
http://marinecarburetor.com/

 

[dodgezilla04]

Re: 1987 Omc V6 4.3l

thanks much.