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  1. #11
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    Default Re: MF 230 Carburetor Questions

    Quote Originally Posted by Jerry/MT View Post
    What about the firing order? The picture looks like you may have it incorrect.
    I was thinking the same thing. The top of the picture doesn't show all the plugs, but it appears to be wired as 1-4-3-2, where reversing 4 and 3 to make it 1-3-4-2 might correct the firing order.
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  2. #12
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    Default Re: MF 230 Carburetor Questions

    Thanks for all the feedback guys. So I pulled off the carb and determined it's a Zenith 13800 carburetor. My understanding that somehow translates to a model 61 or 161. Not sure how that works, but google seems to think so. I guess the previous owner tried to rebuild it as well, because it had the wrong gasket and they also had to patch with gasket paste.

    Attachment 309499

    I put a red arrow to highlight the gasket paste. When I pulled it off I thought for sure a good cleaning and new gasket would solve my problems choke problems, but no such luck.

    Attachment 309500

    I got the primary jet out and verified the float, but I couldn't get the idler jet out. I cleaned it thoroughly and verified it wasn't clogged (carb cleaner drained through it). When I put the carb back on and she fired right up with the choke on, but when I tried to lean it up (no choke) she starts to sputter and will eventually die. The throttle works fine and I can get near full RPM. My understanding of the Zenith 13800 is that there is no mixture adjustment. All documentation I can find says the idle adjustment (green arrow) is the only adjustment. Do you guys agree?

    I decided the next step is to check the intake\exhaust manifold for leaks. My gasket finally arrived today and I pulled it off. Sure enough, it appears that I've got some leakage around cylinder 1 for sure, but maybe also on 2 & 4. The gasket itself didn't look that bad, but I'm wondering how tight the manifold was bolted. I was going to clean it up and put it back on with the new gasket. Do you guys know the correct torque ft lbs?

    MF 230 Carburetor Questions-intake_exhaust_manifold-jpg

    Here's another pic of the distributor. I've got it setup to 1-3-4-2. (CCW)

    MF 230 Carburetor Questions-2013-03-22_16-47-07_595-a

  3. #13
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    Default Re: MF 230 Carburetor Questions

    I found pieces of a copy of the MF230 service manual online and determine the manifold torque spec is 30lbs. I put it all back together and she fired right up....but same as before...would only run with full choke. I've pretty much convinced myself this is a carb problem, but just to make sure I'm not missing something stupid. I tried to run it without the air filter (just in case it was no allowing enough air), but not luck. I also put the timing light back on and verified correct timing and that all 4 plugs are getting spark.

    I took the the carb back off and disassembled again. I let the jets soak in carb cleaner for a couple hours and adjusted the float (by 2/32 of an inch....but I'm grasping at straws here). I also filled the lower carb body in carb cleaner fluid and let that sit for a while. There is a tube that doesn't appear to be removable so I figured I'd let all soak. Still no dice. I tried adjusting the idle adjust, but it doesn't seem to have any effect (I have the choke on). My guess is that the choke is enriching the mixture beyond the range which the idle adjustment can have an effect.

    Aside from purchasing a new carb I'm all out of ideas. Any suggestions? At this point I'm willing to try just about anything. I'm going to pull the carb off again and keep investigating. I've got to be missing something.

    Thanks,
    scott

  4. #14
    Veteran Member Jerry/MT's Avatar
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    Default Re: MF 230 Carburetor Questions

    First let me say I have no experience with Zenth carbs so my input will be based on general carburetor performance.

    What do your plugs look like after running? Are they clean with just a light coating of gray or tan ash?

    Just because you can hit rated speed with no load doen't mean your fuel delivery is adequate. Can you get rated speed under load? If you can't, either you lack fuel or your air cleaner is clogged, limiting power. To eliminate the air cleaner, disconnect it from the carb inlet. Unless you are in a very dusty environment, it won't hurt anything. Generally these carbs are of a pressure balanced design so that fuel air ratios are not affected by air filter restriction but power development, being directly proportion to air flow, is.

    Do you have a fuel bowl drain on the carb? if you do, open the tank valve(if you have one) open the bowl drain and holding a suitable container uner the carb, verify a CONTINUOUS GUSH OF FUEL, like a cow peein' on a flat rock. If it dribbles or is intermittent, you have a fuel delivery problem.

    When your engine stops, does it quit immediately or does it miss a few times and then stop. If it quits immediately, then imediately check for a spark. I mean right now!

    You need to sort out whether your problem is fuel related or ignition related.Then you can find the root cause.

    Remember that the most important thing about the carburetor is that all the passages must be squeaky clean and to get them that way, you need to soak the carb in real carb cleaner for 24 to 48 hours and then blow out the passages with compressed and run small soft wire or mono fishing line through the drilled passages to make sure you get all the crud out. That includes the passage with the float valve also. A small grain of sand, etc in there can inhibit flow enough to cause your problems. You changed the float setting. Which direction did you move ? To a higher float leve or a lower float level?

    If you have a bowl drain, you can make a simple tool to measure the fuel level in the bowl externally without having to open up the carb except to change the fuel float setting. Using a brass fitting that fits the bowl drain outlet, attach a piece of clear tubing. Attach a 90 el to the tubing and another piece of clear tubing to that in such a way that the verticle tube of this the L shaped device is near the carburetor and extends a few inches above the fuel bowl. (Depending on your bowl drain orientation, you may need two els.) When you openthe tank valve, the tube will fill with fuel to the level in the fuel bowl. Since you measure the float level relative a split flange on the carb, you can see if the fuel level is at the correct height.


    You say there is noadjstment for the carb. How does it adjust for power enrichment and ambient temperature changes? Does it have additional fuel circuits besides idle, part throttle and full power?
    These types of carbs are relatively simple and if they have problems, a thorough cleaning and the proper adjustment are all that is needed to get them to operate properly
    Last edited by Jerry/MT; 03-24-2013 at 03:59 PM.

  5. #15
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    Default Re: MF 230 Carburetor Questions

    Success!! I'll write this up just in case somebody else runs into this same problem with their Massey 230. First things first. The Zenith carb is a 68x7, not a 60 or 161. I ended up buying a Zenith carb manual and found this sheet.

    MF 230 Carburetor Questions-zenith-68x7-jpg

    Most of this wasn't new info to me except that you should be able to remove #15 Idle Filler. I still have no idea how as I couldn't do it without damaging the tube. I left it in and just sprayed the heck out of it. I decided that my problem had to be relate to the idle jet (#40) as that's the only one I couldn't get out before. No change there. I tried spayed it down and tried to unscrew, but I could tell that the jet was starting to come apart at the screw top.

    MF 230 Carburetor Questions-idle-jet-jpg

    So I just stuck the carb cleaner straw in and put paper towel around it (to catch blow back) and sprayed for ~15s continuously about 5 times. I had previously soaked this jet, but that wasn't enough. The output of the idle jet is two holes by the throttle body.

    MF 230 Carburetor Questions-idle_outlet-jpg

    After a couple of spays I could tell that something had cleared as more and more was getting through. Who would have thought so little could cause me so much trouble.

    MF 230 Carburetor Questions-grime-jpg

    I also noticed that a Massey really wants to be warm before you can pull the choke. I'm used to using choke for <30 seconds on other equipment, but this tractor wants to be warm (~3-5 minutes) before I could completely remove it. During that time I was slowly adding and removing choke while listening to the engine to determine if the mixture was better or worse by RPM. I didn't have much luck with the idle adjust (#3). I'd rotate and out without much difference. I think I'll save that for a warmer day.

    Victory Pic! Idling nicely with no choke!

    MF 230 Carburetor Questions-happiness-jpg

  6. #16
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    Default Re: MF 230 Carburetor Questions

    Jerry...thanks for the feedback. When it died it would sputter. I had my other electrical problems with the tractor, but I think those are all resolved. The carb does have a bowl drain and it was always full. Now that I've pulled this carb off multiple times I could probably do it blindfolded now. My hands could use a break from gas and carb cleaner...they're pretty chapped. The plugs are new, but I plan on pulling them and cleaning them. I'm sure I've fowled them during all my rich running.

    That is the truth! "all the passages must be squeaky clean". That's my new advice to everybody having carb troubles!

  7. #17
    Veteran Member Jerry/MT's Avatar
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    Default Re: MF 230 Carburetor Questions

    Glad you got the problem solved. With carbs it's almost always crud in a passage, not worn parts. Sometimes throttle shaft seals wear out, some times needles get scored but dirty fuel systems are the major enemy of carbs.
    Now go work that machine!

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