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4640 starting

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flancows

05-18-2005 12:11:05

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I just bought a 4640 with 6750 hrs. Dealership told me it had 1000 hrs. on bottom end and 500 hrs. on head. No pistons and sleeves. They can"t find paperwork because dealership has changed hands. Did a serial # and found it was sold in Texas new. I"m in Wisconsin. Starting on cool mornings (30-40 degrees) it takes 30-40 seconds of cranking to start. Are they cold-blooded or does that say I"ve been getting a load of bull. No oil leaks or use and we"ve put it through the paces. Dealership says they will make it right or take it back if they can"t come up with info I want. Any comments or suggestions appreciated. Thanks Mike

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Gord

05-22-2005 23:50:15

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

Does the tractor turn over at a reasonable speed? If it does then when it starts-does it belch out a lot of smoke? If it does then the injection pump starting fuel delivery is set correctly. If it doesn't then the fuel delivery could be inadequate. The starting fuel delivery is set by an aneroid activator and if it is stuck or inoperative then the tractor will start poorly. Recheck the starting then let us know how it performs.

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Walter Squires

05-19-2005 08:25:33

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

Try turning the steering wheel while cranking, it relives pressure on the hydraulic pump.

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cannonball

05-19-2005 04:36:56

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

are you sure the starter is spinning it over fast enought ...4230 here would turn slow and about 20 seconds crank ... rebuilt starter found screw loose on brushes...put in new armature cranks fast and quick ...have nice day may god bless

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mitchp

05-18-2005 19:54:11

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

does it happen to have the "T" valve on the hydraulic pump where you can cut the pump off while starting. that really helps out.

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masseydan

05-18-2005 19:21:29

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

I work in a machine shop that does valve jobs on about 3 John Deere heads per week. If the shop that did the valve job 500 hrs. ago simply ground the valve faces and the seats, the resulting compression loss will make the engine start as you said. An engine with that amount of hours will almost always need either seats or valves or both to regain the valve recession that the specs call for. Believe it or not, but a few thousands of an inch can make a lot of compression difference in a diesel. We see a lot of quicky valve jobs that run for a year or so and then the guy gets tired of the starting problem. Just my thoughts.

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buickanddeere

05-19-2005 04:39:25

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Re: 4640 starting in reply to masseydan, 05-18-2005 19:21:29

I agree. The previously stated low voltage at the starter is the other half of the problem. What voltage do you measure between the main post into the starter and starter's cast body.

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flancows

05-18-2005 18:10:16

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

Appreciate your comments. Don't know much about motors but understand may be a sign of a weak motor when doesn't start in cool weather. Bothers me they can't come up with paperwork to prove work was done on motor. When I ran serial # that was also a huge surprise it started it's life in Texas. Talked to first owner, he said he traded in 85 or 86 with around 3500 hrs. How did it get so far from home? Has tach been changed or is this second time around or hasn't it done much last 20 years? Questions that are hard to answer here I know. Good looker. Good runner so far. Do I take my chances or keeep looking and maybe get one that may have other problems. Thanks for help. Mike

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JMS/MN

05-18-2005 17:31:15

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

I've had a 4240 for over ten years- was always cold blooded when starting. One thing that helped- after eliminating bad injectors as the problem- was replacing the battery cables-including the crossover. Go to factory ends- not the clamp-on replacements. Cables can have corroded, bad spots in them, even if the surface cover looks ok. Still slower than the 30 or 50 Series that I have.

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twopop

05-18-2005 15:38:44

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

next time you want to start it,pump up the primer pump on the right side of the engine.the check valve at the fuel pump could be leaking fuel back to the tank.

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Jim@concordfarms.

05-18-2005 14:09:09

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

Neighbor has one. Starts as soon as you touch the key in the summer. Maybe cranks for 7-8 seconds in the winter with the block heater plugged in. About 8,000 hours the last time I was on it. Methinks you have low compression or a weak injector pump to need to crank that long. Starter won't last long working that hard. Jim.

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3010 Ken

05-18-2005 13:03:40

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

Mr. Flancows; 30-40 seconds cranking is too long.You mentioned 500 hrs.on the head,I would get the dealer to check the valve adjustments.Then go from there.Kenny

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thurlow

05-18-2005 12:49:24

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Re: 4640 starting in reply to flancows, 05-18-2005 12:11:05

Never had a 46, 'though a 4840 was my "big" tractor for about 15 years; never found it to be as "cold blooded" as the 30 series. Mine had about 9000 (original) hours when I sold it; started better than what you're describing, although it might have to turn over several seconds when the temperature was near freezing; personally I'd rather give it a whiff of ether (although I know some folks are violently opposed to its use) than load the starter that much. If indeed it takes 30-40 seconds to start it, you may have issues that need addressing; 40 seconds is a LONG time for a starter to turn.

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