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New Comer Please HELP

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Chip Middleton

04-23-2000 21:09:20




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I have recently purchased an early model Fordson Super Dexta. I was told the engine smoked because the pump was turned up to much also the tractor is very hard to steer. Given these problems I still love this little tractor. I need to know where to get parts and advice on the tractor as I believe it will be here for quite a while Thanks Chip

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Burrhead

04-24-2000 10:08:46




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 Re: New Comer Please HELP in reply to Chip Middleton, 04-23-2000 21:09:20  
It is not normal for the Minnemec pump to leak fuel internally. If it's leaking fuel into the pump oil, you either have a pump seal out or a barrel and plunger in the pump scored and is by passing fuel. If you're getting fuel into the pump oil it will eventually gald the pump camshaft, and/or ruin the barrels and plungers in the pump. The fuel in the pump oil will also let the interior of the pump rust causing severe damage to all the moving parts.

Most probably what is causing excessive black smoke is the injectors need cleaned and set.

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Brian

04-24-2000 12:33:57




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 Re: Re: New Comer Please HELP in reply to Burrhead, 04-24-2000 10:08:46  
Burrhead,
I have worked with Minimec pumps since their introduction and served my time in a Ford Diesel repair shop in the 1960's. Minmec pumps always leak diesel into the governor houseing. That is why the instruction manual on Dexta's and Super Majors specify that the oil level is checked weekly and drained down. This applies to the whole range of Minimecs on Nuffield and later Fords. Some leak more than others but over time they all dilute the oil in the governors. Thats why you have to change it!
regards
Brian

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Brian

04-24-2000 12:52:11




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 Re: Re: Re: New Comer Please HELP in reply to Brian, 04-24-2000 12:33:57  
Burrhead,
Have just checked my Minimec service details. Pumps prior to 1965 had different annular groves and skip ports. This allowed more fuel to leak into the cambox. Hence the weekly checking of the level. Pumps manufactured after 1965 had a modification to reduce the amount of fuel leakage into the cambox.
regards
Brian



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Burrhead

04-25-2000 06:42:21




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 Re: Re: Re: Re: New Comer Please HELP in reply to Brian, 04-24-2000 12:52:11  
The older it is the more fuel that will get in there, but it makes me nervous when someone is going to run the engine with a high level of fuel in it because it will destroy the pump with prolonged use.

I have 3 of these engines with the same pump here that get used regularly. We check the oil in the pump just like we check the engine oil.

The reason for that is that I got a $1265 lesson on the fuel in oil.

For awhile some folks here were telling these guys not to even put oil in the pump because the fuel would keep it lubed.

You're doing a good job Brian. I just did'nt want to see Chip take the problem too lightly.

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Brian

04-25-2000 11:01:37




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 Re: Re: Re: Re: Re: New Comer Please HELP in reply to Burrhead, 04-25-2000 06:42:21  
Burrhead,
Thanks for your comments, sorry if I was a bit sharp but I have lived with these pumps for a number of years and at the moment, am working with Lucas-CAV the manufacturer. Your lub problem is a bit peculiar as the vaccum governed pump relied solely on diesel for its lubrication. The diesel within the pump is used to lubricate all the pumping elements and it is spill from these that causes the oil dilution. I have known these pumps to run with water in the governor houseing with no problem, for a short while. The oil only lubricates the cam shaft and governor linkage. The greatest cause of damage is water in the diesel.
regards
Brian

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Burrhead

04-26-2000 07:00:45




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 Re: Re: Re: Re: Re: Re: New Comer Please HELP in reply to Brian, 04-25-2000 11:01:37  
Yes the water in the fuel is a problem, but the main problem that causes water here is the climate.

In South Texas the pump and fuel tank both continually sweat and put condensation into the pump.



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Chip

04-24-2000 20:58:45




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 Re: Re: Re: Re: New Comer Please HELP in reply to Brian, 04-24-2000 12:52:11  
Thanks a bunch for the info any ideas where i can get more manuals I have the I T manual but its pretty vague. I also need parts to rebuild the steering gear. I know it sounds like this tractor is shot but I bought it for 600.00 U.S. dollars and it runs and the lift works. I think it will be a good project.



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Chip

04-24-2000 21:06:04




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 Re: Re: Re: Re: Re: New Comer Please HELP in reply to Chip , 04-24-2000 20:58:45  
I think there is a problem, my tractor has a Simms pump with a vacum govenor. Could this be why it smokes so much? The previous owner said it used a lot of diesel, and if you worked it hard the smoking quit while under load.



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Brian

04-24-2000 06:49:41




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 Re: New Comer Please HELP in reply to Chip Middleton, 04-23-2000 21:09:20  
Chip,
I would check your aircleaner and make sure the filter wire is clean. Your Super Dexta will have a Minimec pump so Bill's comment about the excess fuel button would not apply. It works great when you have a vaccum governed pump. (So does a screwdriver in the aircleaner primary cleaner! Just a slight increase in gap between the fins and your engine speed rises. NOT RECOMMENDED however). If your excess fuel button sticks on a Minimec pump, the engine will fire up, run at reduced power, or stop and not start. On the Minimec pump is an oil filler at the top of the governer houseing (15/16"), a level plug on the side of the governor houseing (1/2") and a drain on the bottom (1/2"). The governor houseing should be drained and filled to the level with engine oil every oil change. Take care as it is easy to strip the threads of the ali. governor houseing.
Diesel from the main part of the pump leaks through to the governor and dilutes the oil. This is normal. The level should be checked once a week/month depending on use. If this oil/diesel mixture builds up, it will slow down the goveror reaction and give you black smoke. Remove the filler and level plugs and allow the oil to drain down. If lots of liquid comes out you may have solved your problem. Change the oil, refilling to the level.
regards
Brian

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Bill in Mich

04-24-2000 05:06:43




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 Re: New Comer Please HELP in reply to Chip Middleton, 04-23-2000 21:09:20  
Not sure about your Dexta,but on the Major inj.pump there is a cold weather button that you press to help it start when it is cold out. It may be stuck in. Its located on the lever that moves on the inj. pump when you shut it off. Pull the shut off lever and then see if you can pull the button out. It wont move a lot,but it will make a difference with the smoking if its stuck in. Put this button in while its running and you will pick up a few extra h.p. A tractor puller told me this, but I dont know if it is very good for the tractor . I tried it a couple of times for a short pull and you can feel the difference in the power and boy will it smoke!! Sorry about the sidetrack, Hope this helped,Bill

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John

04-24-2000 04:43:42




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 Re: New Comer Please HELP in reply to Chip Middleton, 04-23-2000 21:09:20  
Don't know about Dextas. I have 2 Majors with totally different "personalities" One smokes quite a bit (black smoke under load only) The other not so much. The non-smoker starts cold much better. I got the injectors in the smoker tuned up at the diesel shop. It didn't really make any difference. I didn't do anything with the pump. It does run good and has good power so I'm just leaving well enough alone at this point. I plug it in to start it below freezing. Has 850W tank heater I plug in several hours when it is real cold or overnight. Have started fine at -30 degrees then. I feed round bales with it. Anyone else have any ideas?

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