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post #1 of 14 Old 09-05-2013 Thread Starter
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Carburetor Rebuild

4695 M Mercury Marine 70 Carburetor Diagram and Parts

I have a Mercury 5 HP 2003 model me5ml serial # 0r030098 outboard.

I would like to rebuild the carburetor. I have been informed that their is no rebuild kit for this unit.

I'm never done this before but I want to give it a try.
1. I think I found the right list of parts, does the above page look right. I could not search on the model number which I found odd but I was able to search on the serial number?

2. Is this the best place to buy the parts?

3. What parts should I replace?

4. I've been told all I have to do is take it apart and soak and clean everything in carb cleaner and put it back together again with the new parts and it should run like a top.

Am I missing anything important. Yes I'll take pictures.

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It is a lesson about the limitations of wax as an adhesive.
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post #2 of 14 Old 09-05-2013
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Re: Carburetor Rebuild

Finding parts by serial number is not unusual for Mercury. I would think you will be fine with this route. Me, I'm lazy I would try some Berrymans B12 shot directly into the carb if it will run at all before I did a rebuild.
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post #3 of 14 Old 09-05-2013
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Re: Carburetor Rebuild

Quote:
Originally Posted by davidpm View Post
4695 M Mercury Marine 70 Carburetor Diagram and Parts

I have a Mercury 5 HP 2003 model me5ml serial # 0r030098 outboard.

I would like to rebuild the carburetor. I have been informed that their is no rebuild kit for this unit.

I'm never done this before but I want to give it a try.
1. I think I found the right list of parts, does the above page look right. I could not search on the model number which I found odd but I was able to search on the serial number?

2. Is this the best place to buy the parts?

3. What parts should I replace?

4. I've been told all I have to do is take it apart and soak and clean everything in carb cleaner and put it back together again with the new parts and it should run like a top.

Am I missing anything important. Yes I'll take pictures.
David,

Depending upon the age of the motor a complete new carb can often be less expensive than rebuilding it. Less frustrating too. The newer carbs are not your gran-daddy's Mikuni..... They have pathways so small that even ultrasonic cleaning often does not work.

Honda for example, on their mowers, has had such a problem meeting the EPA regs and that combined with the added Ethanol, has caused nightmares.

The carb for our HRX lawnmower (4th one in 9 years) has gone from $160.00 to $16.00.. That's right the entire carb is just $16.00 because Honda has had such a problem with them. My first one was $160.00 (Honda paid for that one) and they only installed it after they, the dealer/warranty shop, FAILED to make it work by rebuilding it twice. The protocol now is for dealers to simply replace the entire carb.. Everything else about this mower has been simply AMAZING and I really can't complain about Honda when they are simply trying thier hardest to meet USA rules and dealing with CORN in our gas. Considering they have dropped the price of the carb to $16.00, in order to keep customer relations good, kudo's to Honda Motor Company....

NOTHING has worked on this mower to keep the carb pathways clean. Every year I have tried a new stabilizer, drained fuel and even drained the carb bowl but you simply can't get the $hit out of the teeny tiny pathways. Every couple of years I just spend the $16.00, could be $12.00 by now, to replace the carb.. I can now do it in about 6 minutes flat....

Your Merc may also be a Tohatsu/Nissan, depending upon age, and the carbs are very often interchangeable... If your motor is older eg: early 90's and back then re-building the carb often works well...

With lots of the new carbs they do not/will not sell parts for them. This is because the parts such as jets etc. are fixed in place, factory sealed, and can't be tampered with due to EPA standards.

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Last edited by Maine Sail; 09-05-2013 at 08:04 AM.
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post #4 of 14 Old 09-05-2013
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Re: Carburetor Rebuild

Yeah, the carbs are cheap .. I guess 100 - 125 bucks.

I " rebuild" mine all the time - no kit needed.

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post #5 of 14 Old 09-05-2013 Thread Starter
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Re: Carburetor Rebuild

So what is involved in a carb replace.
A couple of nuts?
I assume you need a gasket?
Some kind of goop to put on the gasket?

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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Re: Carburetor Rebuild

Mine was a simple swap. 20 hp Tohatsu, 4 years old.

I removed it and cleaned it as best I could. I could not get the lower chamber opened the evening I did this. (The person helping me burst the little bellows, but that's another matter.) It still did not run perfectly.

I bought a new carb and had it shipped to a friend's house near where we located. A few days later we were about to have dinner at a restaurant with these same friends. They showed up with the little box in hand.

It was a 50 minute wait at the restaurant for a table and the women were scattered to do some shopping. So I drove to the dinghy, dinghied to the boat, grabbed my tools, dinghied back to the shore, remove the old carb, installed the new carb, cleaned-up, dinghied the tools to the boat, dinghied back to shore, drove back to the restaurant, and met them right after they were seated.

Later that night, after arriving at the dinghy in the dark, it started right up and ran like it was new. (In spite of flipping diring hurricane Sandy.) Wife and kids were impressed.

Yes, I recommend getting a new carb.

Regards,
Brad

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Last edited by Bene505; 09-05-2013 at 03:48 PM.
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post #7 of 14 Old 09-05-2013 Thread Starter
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Re: Carburetor Rebuild

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Yes, I recommend getting a new carb.

Regards,
Brad
Was their any parts involved other than the carb.
gaskets, goop etc.?

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It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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Re: Carburetor Rebuild

Any particularly good places to purchase the carburetor?

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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post #9 of 14 Old 09-05-2013
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Re: Carburetor Rebuild

The new carb advice is THE surefire fix; however, I've been lucky sometimes by simply removing the carb and bowl, and spraying the ***** out of the carb with carb cleaner, no kit, no new parts. If it's running poorly, you've got nothing to loose giving this a try.

First time I did this I was reluctant, but get out your tools and start taking it apart...it's pretty straight forward.
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Re: Carburetor Rebuild

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Originally Posted by davidpm View Post
Any particularly good places to purchase the carburetor?
I searched around to find the cheapest place, online.

If I find the box (with the old one in it) anytime soon, I'll let you know.

Regards,
Brad

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