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Massey Harris & Massey Ferguson Tractors Discussion Forum

Z-134 misfire

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CityBoy

08-02-2004 16:59:34

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Need some guidance please.

Was shredding for several hours a week ago in the Texas heat putting a fairly good load on the old 35. Engine started missing some and progressively got worse. Changed out the plugs this past weekend with Champion D-21's and found that #4 was black and wet. Other three plugs were varying shades of brownish off-white. Cranked right up on the new plugs but still missing regularly at high idle, and missing badly under a load, sometimes not firing at all on one cylinder (#4 I assume) for several revolutions.

Have been told to change out dist cap and wires which I will do. Sediment bowl has only a small amount of trash in the bottom.

Here's my question. After I replace dist cap and wires and clean sediment bowl and screen what's the next thing I should check if it's still missing?

Oh yeah, forgot to mention ... it doesn't smoke and oil level requires only infrequent topping off.

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CityBoy

08-16-2004 17:52:22

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Problem solved in reply to CityBoy, 08-02-2004 16:59:34

Checked spark from #4 wire. Plenty of spark. Had new dist cap and rotor; so replaced them anyway. Put known good plug in #4; new plug that was in there still looked new. No change. Switched wires. No change. Finally pulled gas tank and valve cover. Clearances were all over the place. Set all valves to .013. Hooked up #1 and #4....so I could actually tell if #4 was firing. Started right up and ran smoothly on two cylinders. Put everything back together. Best it's run in several years.

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Jerry/MT

08-03-2004 16:41:15

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Re: Z-134 misfire in reply to CityBoy, 08-02-2004 16:59:34

Check to make sure that you have a nice fat bluish white spark. If you have tuned it up properly you should. Also check the radial play in your distributor by pushing radially on the shaft with the points in the closed position. If the points open then you have a worn shaft and/or bushing and it/they need replacing. Is the residue on the plug wet and oily? If it is you most likely have a bad oil control ring on that cylinder or a worn intake valve guide.

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Oldfarmboy Jim

08-02-2004 22:03:50

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Re: Z-134 misfire in reply to CityBoy, 08-02-2004 16:59:34

If the problem isn't fixed after doing everything in the previous post, check the power jet on the carb. It may be set too rich, which will sound just like misfires under load and at higher RPM's. Turn it all the way in and then back it out one and a half turns. Then, put it under a load and see if it's not better. Also note that the rotor turns counter-clockwise unlike Fords. They'll run if you put the wires on the wrong way, but it won't sound nice and you'll have to screw with the timing to get it off the dime. (personal experience in both cases. Hope you find the cause without giving up an arm and a leg. I'm doing rings and bearings on an MF 50 with the Z-134 this week. It smoked, but didn't misfire. The compression on #1 cyl. was 80 dry and 120 wet. It's a pretty nice engine to work on though, so I'll enjoy the effort. Good luck, Jim

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Randy

08-02-2004 21:11:57

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Re: Z-134 misfire in reply to CityBoy, 08-02-2004 16:59:34

Sounds like new plugs, wires, points, condenser, cap, rotor would do the trick. That's what my z134 needed. And remember to use solid copper core wires. They don't like modern suppression wire.
Still missing after that? Do a compression test. If #4 comes up short, put a little oil in the cylinder and try again. If it comes up higher, your rings are bad. If no higher, the problem is in the head ie valves, guides, seals.

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