mercruiser carb

J

jrl

Cadet
Joined
May 2, 2004
Messages
22
Im trying to figure out which carb I have on my 1986 3.0 Mercruiser 140 4 cyl. I was told that it could only be 1 of 2 carbs a rochester or a mercarb...the only #s on the carb are 13899350 6103 any info would help out Im trying to find the right rebuild kit for my carb. Thanks
 
T

Trent

Captain
Joined
Nov 17, 2001
Messages
3,333
Re: mercruiser carb

At the base of the carb does it have one or two idle mixture screws? One screw is a Mercarb. Two screws is a Rodchester.
 
R

Rhadley

Petty Officer 1st Class
Joined
Jul 20, 2003
Messages
227
Re: mercruiser carb

You also need to know which type of Mercruiser carb you have since they come with different accelerator pumps. There is the 3/4" dia and 5/8" dia types, and starting in 1987 another type. <br /><br />If you remove the top of the carb you can see the accelerator pump, which is a rod with a rubber piston-like seal on it. If the top of the rod has a hole through it and it is straight, then it is the 5/8 type. 3/4 one is bent at top.<br /><br />Better instructions are at amarket.com
 
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