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Problems with new engine overhaul

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'71 3020

06-29-2006 19:20:20




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I just finished my first year at tech school for diesel mechanics. I overhauled a 5020 for a neighbor at school this spring. The sleeves were cavitated to the point of almost all of the way through, it had a leaking sleeve packing, and the owner had been running it like that. The cam lobe that drives the fuel transfer pump was totally wiped out. The valve guides were worn worse than any my instructor had ever seen in 30+ years of being a mechanic/teacher. The valves were recessed into the head well beyond spec. The owner of the tractor is ill and we were on a bare-bones budget. The valve guides were knurled, and two of the very worst were replaced. The camshaft was reused. The mechanical transfer pump was replaced with an electric one. The valve seats were reused. The pistons and sleeves were replaced. The injectors (pencil nozzels) were all replaced. The injection pump was sent to the pump shop, but I don't know what they did to it. The engine ran great for what it was when I was done. It ran on the dyno for two hours, and I put about three more hours on it driving around, ect. Today he called me over to listen to it. It had a miss and a ton of blue smoke. He claims it's been like that since he got it back, but I had it running the morning it left and it was fine. He put about two hours on it driving it home. I cracked each fuel line open to see if I could isolate one cyinder, when I retightened line #3, it smoothed out perfect, but some blue smoke remains. What could be going on here, could that electric fuel pump be screwing us up? Like if he turned off the key before shutting off the engine? Would this cause an air lock of sorts? It has no blow-by.

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Lee B

07-01-2006 01:09:46




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
Air lock sounds like the ticket to me. Why not wire the fuel pump to pump while it's got oil pressure? A blocking diode between the added on oil sender circuit and key switch would still allow you to use the key to shut it off.

Does the return to the fuel tank drop fuel from the top or does it go to the bottom of the tank where air can't work into the system? My suspicions are that dropped return fuel setups seem to need a bit more cranking time to get started. On such systems I seem to find a big improvement in cranking times required IF I can manually prime for just a minute or two - coincidence?

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machinery-man

06-30-2006 13:01:07




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
Seems like you"re learning a lesson outside the classroom. My experience over 45 plus years working on equipment is there is not anyway to patch up something turning thousands of rpms. It"s either right or junk after the project. Also you can"t rig up something to save money. From your description in trying to do someone a favor because they didn"t want to spend money or allow you to spend money and do it right you"ve got both a bump repair and misdirected neighbor. I believe I"d straighten out my neighbor before I did anymore on the tractor. Other than that you"re just getting in deeper. He"ll have you buying him a new tractor.

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JDmaninSD

06-30-2006 09:45:14




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
i worked on JDs for 45years and soon learned not to let owner tell me what put in one new do it right or not at all Kent



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Henry M

06-30-2006 07:35:47




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
71

I will try to say something constructive here like most did.

I only do mechanical for myself and some friends. I always push the low cost option that will get the job done. After all, that is the way I go thru this world and I am not making a dime on the work I do for friends (who always return a favor one way or tuther)

Something to think about down the road. After completing a job i always have the owner run it around while at my place or if a small engine take it to them and we run it up together. It never comes back with it was that way when I got it - or hasn't yet.

If it ran great for you I would be suspicious of what happened to it. Who knows.

As you go on in life and you continue to do mechanical you might consider the "lets try her out and see what you think" approach before it goes down the road.

I have a friend that will overhaul motors (autos with underneath filters)and when he paints them he will always get some overspray on the oil filter. I asked him one day about his "sloppy" paint job.

He smiled and said that if it comes back ragged out and the filter has the overspray on it, the owner is not in for any help at all.

Anyway, hope it works out.

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skip3362

06-30-2006 05:51:21




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
check and recheck your timing slow timing will make blue smoke and will cause them to run funny sound like miss also pull some fuel to see that it is diesel.Paul



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mowr

06-29-2006 23:35:21




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
I would wonder how much 'diesel fuel treatment', ATF or other additive he might have put into the fuel, if he ran it out of fuel and then cracked a ring by using starter fluid to get it going, or some other such thing. If you made sure the pressure specs on the electric pump were the same as those on the original mechanical pump, I don't think you should have a problem there.



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buickanddeere

06-29-2006 21:33:17




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
"He claims it's been like that since he got it back, but I had it running the morning it left and it was fine." Hmmmmm mmmm. Time to quit trusting and feeling sorry for your neighbour. He didn't take care of his equipment any better than he took care of his $$$ or personal health. He's his own worst enemy. Some people you just can't or shouldn't help. My Father-inlaws shop refuses to do econo rebuilds. The customer comes back complaining about the shoddy work, doesn't want to pay and they tell every person they can find thier version of the story.

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msb

06-29-2006 21:08:45




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
I would pull the injectors and have then checked out before I did anything else.Could be just a speck of dirt so small you can't see it has stuck a nozzle open.Even happens to new ones on occasion.



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Roy Suomi

06-29-2006 20:20:18




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 Re: Problems with new engine overhaul in reply to '71 3020, 06-29-2006 19:20:20  
Sounds as if you covered all bases..I think I would start with a compression test..If that shows nothing obvious , I would try a cylinder leakage test on each cylinder..Blue smoke is an indicator that tells me ring problems..Can it be white-ish smoke?? this indicates either a fuel problem or incomplete combustion..Non-turbo engine?? Pull the exhaust manifold and watch the ports as it runs to see which cylinder is messing with you.I also use a point and shoot temp tester to find a cooler cylinder...

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