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Farmall & IHC Tractors Discussion Forum
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Spark plug removal on SMTA Diesel

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Berck14

08-18-2006 14:43:18




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How do you remove the spark plugs on a SMTA Diesel without removing the manifold. The rear plug seems impossible to remove without removing the manifold.




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Haas

08-19-2006 10:28:39




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 Re: Spark plug removal on SMTA Diesel in reply to Berck14, 08-18-2006 14:43:18  
I guess this is like the MD. One of the plugs is nearly impossible to get at. I got a 3/8 drive 7/8 inch deepwell socket. I was able to get it out with that and a flex handle. Could not get a 1/2 inch drive 7/8 inch socket in there.



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farmallwrangler

08-18-2006 18:20:55




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 Re: Spark plug removal on SMTA Diesel in reply to Berck14, 08-18-2006 14:43:18  
wdrew24, Your comments about the "flipper" in the intake manifold are very interesting. The MD I am restoring is harder to start on gas than it should be and I'm thinking that may be part of the problem. My question is what actually activates that shaft? mine has some electrical terminals on the front cover that the hot lead to the coil is attached if I remember correctly. My manual shows all the parts but is not clear on what operates the shaft. Sorry for the long post and thanks for any info!

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wdrew24

08-18-2006 19:33:22




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 Re: Spark plug removal on SMTA Diesel in reply to farmallwrangler, 08-18-2006 18:20:55  
On the back side of the intake there is a shaft that runs from the center to the let...and from the center to the right. At the center there is a fork that points towards the block. There is a shaft that runs north and south that has a piece on it that intersects this fork. This piece has an adjustable nut on it that the I T shop manual tells how to adjust properly. Under both end caps there are springs that help to close the flippers, or keep them open depending in which mode the tracor is in. The 2 terminals on the one cap is a ignition cut out switch. When the tractor is in diesel mode, it kills the power to the ignition so as not to continue to ignite the plugs. You leave the ignition switch on so generator continues to charge the battery. I learned most of the diesel stuff by error and trial. Feel free to ask any and all questions...If I don't know the answer....I'm pretty sure I can find it. Not being boastfull, just trying to help.

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wdrew24

08-18-2006 17:53:33




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 Re: Spark plug removal on SMTA Diesel in reply to Berck14, 08-18-2006 14:43:18  
If you use one of those spark plug sockets where the top looks like a nut, then put a box end wrench on it you will have plenty of room. Are you changing plugs because it has become hard to start on gas? Many people have done this only to find it doesn't help....it is usually followed by a new coil, points, cap, wires, and a carb rebuild and then after all this has been done....she still don't like starting on gas. The problem I have found many times is that the 2 flippers in the intake manifold aren't closing 100%. And believe you me, if they don't close 100%, the air will not flow through the carb thus not pulling up the gas. The air will always take the least path of resistance. The only way to check this is to pull the intake, close the flippers, and snake a flexible light down the air side of the intake. First one port, then the other. If you see ANY light on the engine side, you have a leak. Open the flipper and send a dremel tool down there and clean out the crud where the flipper is supposed to seat. This is the #1 problem with dual fuel engines not wanting to start on gas. I have bought so many of these tractors for next to nothing, spent one afternoon doing the procedure described above, and resold the tractor as a smooooo oth starter. Hope this helps. Drew

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the tractor vet

08-18-2006 16:51:36




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 Re: Spark plug removal on SMTA Diesel in reply to Berck14, 08-18-2006 14:43:18  
It can be done with out removing the manifold



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