1996 Mariner 115 carb part numbers...help

big_b16 · #1 January 19th, 2008, 02:10 AM

I've pulled my carbs and was trying to reference the part numbers to tell if they were WME 33/51/etc. The part number cast into each carb body is 3301-824902C. I can't find that part number anywhere on the mercury parts express website. The main jets I pulled out were not matched to any of the carb part listings. The closest was WME-51. There is a 51-1,2,3,4 stamped on the sides of each (respectively) so I'm figuring they are WME-51. Problem is that one main jet was destroyed during removal so I need to replace it. Upon inspection, the main jets are (from 1 to 4) .062, .06* (the destroyed one), .060, and .064. The WME-51 calls for .062 on 1,2,3 and .064 on 4. Should I replace what was in there or go with what is on the Mercury parts express site? The part numbers for the WME-51 are not the same as stated before (3301-824902C) so I'm wondering if the part numbers have changed or the last owner put some random jets in on some old carbs and stamped the 51 on the side. Any help or insights would be appreciated. Serial number is 0G348734...sorry it was late.

Laddies · #2 January 19th, 2008, 09:01 AM

Without a serial number we can't be of much help other than to tell you if your at sea level use the jets that mercury recommends

big_b16 · #3 January 19th, 2008, 09:28 AM

SN added to above post.

Laddies · #4 January 19th, 2008, 11:54 AM

1, 2 and 3 use .062 and number 4 uses .064 ck http://www.mercruiserparts.com/Show_...%2F80%2F81here

big_b16 · #5 January 19th, 2008, 01:07 PM

Thanks Laddies, I found those numbers. I'm not sure of the entire maintenance history on this motor because someone pulled the VRO off and did a hack job on the wiring. When pulling the main jets that are in the carbs already I did find that the ones in it didn't match OEM specs (since a .060 was in 3). I'm in Ohio, so around 1000ft above sea level. In your opinion, should I replace with what was in them or put it back to an OEM condition? The engine ran fine before but I was doing some preventative maintenance over the cold season. The last wrench may have put whatever they had on hand in or someone could have done a custom tune and found that .060 worked better...I'll never know. I might buy one of each and put it back to OEM, then switch out the ones I know were different. Would this be wasted time?
I'm still trying to figure out an unusual problem. After running at WOT in water temps over about 75 the engine makes a hissing sound until I idle it for a while. Any water temps below that will never cause the problem regardless of how long I run it at any throttle setting. Only thing I can think that I haven't checked via removal/replacement is the exhaust flange gasket, but looking around the base of the powerhead with the lower cowling removed and didn't find anywhere that shows signs of blowby. I'm running 50:1 premix since the VRO was removed. I shorted the overheat sensor and the buzzer went off, so it apparently is working. Granted, that is the first time I've ever heard the buzzer go off since the warning module was canned in the VRO removal hack job. Any thoguhts on that?

Thanks again for all your help on this thread and the many others you've provided invaluable advice.

Laddies · #6 January 19th, 2008, 01:36 PM

Not knowing the prior service record or dealer I would go back to factory jet sizes they spend alot of time and money engineering these engines and in most cases have them preforming as well as possible. As far as the heat sensor it sounds like it is working fine it is not dependent or the oil module or circuit to operate.