[AT] jd 70 diesel tractor

Fri Apr 25 18:20:43 PDT 2014

Ok, I found an original I & T Manual JD-8, dated 1956, $2.50 for the 70
Diesel.   Crankcase holds 12 quarts.  Need to understand better what the 5
quarts is all about! Remember this is a diesel so it will burn oil pretty
efficiently when mixed with diesel fuel. . 

Dean VP
Snohomish, WA 98290

“ . . . The tree of liberty must be refreshed from time to time with the
blood of patriots and tyrants. It is it's natural manure . . . “ Jefferson

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of joehardy at epix.net
Sent: Friday, April 25, 2014 5:37 PM
To: Antique tractor email discussion group
Subject: Re: [AT] jd 70 diesel tractor

Greg, It is probably sucking the oil up past the rings and burning it in the
combustion chamber.  I owned an early VW Rabbit diesel and when the rings
became worn, the engine would begin to run away with its self without
stepping in the throttle because the engine was running on crankcase oil. 
My car manual said that if you experienced that condition when in neutral,
get away from the car because the engine  would crank up so fast that it
would blow itself apart. I believe you need the take the engine apart.  Keep
us informed as to what you find....Joe Hardisky, Ryman Farm Dallas, PA On
Friday, April 25, 2014 7:44 PM, Dean VP <deanvp at att.net> wrote:

I am unable to put my hands on a JD 70 Diesel Operators Manual at the moment
>but a 720 Diesel takes 9 quarts of oil in the crankcase. I would 
>suspect the
>70 Diesel to be very similar if not identical.  So the 5 quarts 
>mentioned trouble me.  The way the Two Cylinder Engine is designed with 
>the oil pump in the very bottom of the crankcase, I find it strange 
>that the oil pressure goes to zero if there is still 4 quarts of oil in 
>the engine. Sum ting wong here.  I suppose it is possible that the fuel 
>pump is sucking oil out of the crankcase and feeding it to the engine.  
>OR  one or both piston's oil rings are broken or stuck  Or a valve 
>guide is broken or something. But to suck up that much crankcase oil in
such a short time it has to be something major.
>
>Dean VP
>Snohomish, WA 98290
>
>" . . . The tree of liberty must be refreshed from time to time with 
>the blood of patriots and tyrants. It is it's natural manure . . . " 
>Jefferson
>
>
>-----Original Message-----
>From: at-bounces at lists.antique-tractor.com
>[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of Dean VP
>Sent: Friday, April 25, 2014 3:35 PM
>To: Antique tractor email discussion group
>Subject: Re: [AT] jd 70 diesel tractor
>
>I need to look at a 70 D manual but 5 quarts of oil doesn't sound 
>anywhere close to enough oil to go from completely empty to full in the 
>main engine crankcase.  It sounds like the oil is is being burned in 
>the combustion chamber. But I would think it would be smoking badly. 
>Where are you checking the oil level?
>
>Connected by DROID on Verizon Wireless
>
>-----Original message-----
>From: Tyler Juranek <tylerpolkaman at gmail.com>
>To: Antique tractor email discussion group 
><at at lists.antique-tractor.com>
>Sent: Fri, Apr 25, 2014 22:17:18 GMT+00:00
>Subject: Re: [AT] jd 70 diesel tractor
>
>Greg,
>Even if it was sold as is, and the dealer says he stands behind what he 
>sells, I'd call the dealer.
>Did the oil go on the floor?
>I wonder if the tractor is out of time?
>Did the guy put new wires or anything in the distributer?
>Good luck!
>
>On 4/25/14, Greg Hass <ghass at m3isp.com> wrote:
>> Yesterday my brother bought a John Deere 70 diesel tractor with pony 
>> start. He drove it home the 4 miles while I followed. When I drove up 
>> he was putting it in the shed. It didn't quite sound right to me but 
>> I thought it might be the different sound caused by being under the roof.
>> Then he said that most of the trip it didn't have any oil pressure 
>> but he thought the gauges didn't work. I said that that type of gauge 
>> almost never gave trouble; copper tube to the gauge, not electrical.
>> We checked the oil level and it appeared empty; not good. We put in 5 
>> or so quarts to the full mark and restarted the engine. The oil 
>> pressure rose right to the top but soon started to drop and within 
>> less than 2 minutes was back to zero.  We shut it off and checked the 
>> oil again; it was completely empty with no sign of where it went. I 
>> thought maybe we should try more oil again, but by this time my 
>> brother wanted nothing to do with it. He did call a guy in the 2 
>> cylinder club who is considered to be knowledgeable and all he could 
>> think of was a cracked block; however there appears to be no oil in 
>> the
>water or water in the oil.
>> What puzzles me is where could 5 quarts of oil go to in less than 2 
>> minutes? Also, it sounds like it is not firing on both cylinders and 
>> has another funny sound like a leaking valve. Over two days when he 
>> was looking at it they started it at least 6 times and drove it back 
>> and forth and it ran perfect. The reason for starting it so much was 
>> that earlier a young guy who said he knew all about these tractors 
>> had tried to start it without the dealer present. Well, he turned the 
>> dash mounted fuel valve the wrong way and turned it so tight that 
>> when he went to turn it back it twisted off the valve.  In the 
>> process of fixing the valve some dirt must have gotten in and the 
>> pony motor wasn't getting enough gas to run right. After getting the 
>> gas problem fixed they started the tractor several times to make sure 
>> it was alright. As I said, at that time it started and ran perfect. 
>> It has good paint, good tires,wide front,power steering but no 3 pt. 
>> The person that traded it said on the phone the the only thing wrong 
>> when traded was a small leak in a steel hydraulic line, which we had 
>> already noticed. The dealer said he always stands behind what he 
>> sells, but he did put "as is" on the bill so we wouldn't go there at 
>> this time. It seemed like a good tractor, but with this problem it's
>worthless. Any ideas from the list?
>>                                Greg Hass
>>
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