[AT] 1935 JD B Testing progress.

[Dennis Johnson]

Dean

One thing i have done a few times is to weld a nut on the stub, or weld a bolt to it. The heat from welding tends to loosen it and a new hex is good for a socket to grip. Works great for bell housing to transmission bolts that striped internal torx.

If you think you can re-use the stud, the drill the nut method I’d you want to save the stud. 

Dennis

Sent from my iPad

> On Nov 25, 2020, at 7:46 PM, Dean VP <deanvp at att.net> wrote:
> 
> I think I found the real problem on my 1935 JD B today.  I applied 30 psi of
> air pressure to the carburetor inlet side of the manifold and air was
> rushing out the exhaust pipe with all valves closed.  Apparently I have a
> rust out in the manifold or a blown gasket between the input and exhaust
> side of the manifold.  Started pulling the head today and have everything
> loose except the water hoses. Will soon have everything off to see if
> anything is visible.   I was hoping I wouldn't have to remove the manifold.
> The manifold studs will not come out without twisting off. I'm going to try
> to use a nut buster on the top nuts and see if I can get the nuts off
> without breaking the studs. Then try to remove the manifold.  Was hoping I
> wasn't going to have to do this but I'm glad I found the problem.  Will
> probably be looking for a new reproduction manifold or good used one.
> Leon???  Real progress today.
> 
> Dean VP
> Apache Junction, AZ
> 
> -----Original Message-----
> From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Dean VP
> Sent: Tuesday, November 24, 2020 9:35 PM
> To: 'Antique Tractor Email Discussion Group' <at at lists.antique-tractor.com>
> Subject: Re: [AT] 1935 Testing progress.
> 
> The later JD All Fuel JD B's, which had higher HP, had a compression of
> 70psi. Haven't found a reference for the earlier JD B"s.  But it surely
> wouldn't be higher than 70.  The difference between cylinders of 7 1/2psi is
> pushing the limits of acceptability.  These tests were with the tractor
> cold. The compression test is supposed to be run when the tractor is a
> running temperature. The next test to run is the manifold leakage test. Then
> I probably will install the magneto and carburetor and get it running so I
> can do a high temperature compression test.  I may just pull the tappet
> cover and see if the lash is set right on the valves first. Now that I have
> the right tools to do the testing I Can make some progress. 
> 
> Dean VP
> Apache Junction, AZ
> 
> -----Original Message-----
> From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Dean VP
> Sent: Tuesday, November 24, 2020 7:43 PM
> To: 'Antique Tractor Email Discussion Group' <at at lists.antique-tractor.com>
> Subject: [AT] 1935 Testing progress.
> 
> Was able to get the 1935 JD B out of storage and since I had the carburetor
> and magneto removed during the winter storage we just pulled it to new
> location for the winter. Since we were pull moving anyway I asked my friend
> to pull me in gear  about the distance of the two blocks with the plugs out
> to get the oil pressure built up for the compression pending compression
> testing.  Then hooked the compassion tester and 7/8" to 154 MM adapter up
> and had him pull me a 100 feet or so in gear and tested compression on each
> cylinder.  Thew results were not as expected.   Got about 62 1/2" psi on the
> left cylinder and about 55 psi on the right  cylinder.  I expected a much
> larger difference between the two.  Not sure what it should be but sone
> reason I expect 70 psi but I don't remember where that came  from.  But the
> 7 1/2psi difference by itself tell me I need to tear into this tractor.,  I
> don't think.  Tomorrow I can do the manifold air pressure test.  If I can
> complete that. He results o
> f that test will determine what I test next,
> 
> 
> Dean VP
> Snohomish, WA 98290
> "Socialism is a philosophy of failure, the creed of ignorance, and gospel of
> envy, its inherent virtue is the equal sharing of misery."
> ..Winston Churchill...
> 
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