Maine4140HD
Member
1963 4140 heavy duty industrial serial number 19120
Hello,
I recently removed the engine to fix a rear main seal leak. The seal was done by someone dropping the oil pan. It wasn't offset at all and one side seal pin was not all the way in and bent 3/8" over. I found a bad rear main bearing and #4 rod bearing. After polishing, new main bearings, I used plastigage and got 0.002-.0.003" on the crankshaft main journals. Still waiting for rod bearings. I measured the roundness of the rear crankshaft journal and it was less than 0.001" with the fowler magnetic stand and displacement gauge.
I removed the cylinders to inspect them. It looks like they need replacement but please inspect the images and advise.
The cylinders are 0.040" over bore EAF6108J. I can't tell if there are sleeves or not. The block is C0NN6015J. I have read that these later model engines were sleeveless. Can anyone confirm this?
I know the cylinder bore is 3.901" + 0.040 = 3.941". Is there a +/- tolerance?
I have received a fowler bore hole gauge today but still waiting for the 3-4" fowler outside micrometer which I will get on Thursday.
Is there a tolerance on the cylinder diameter? I have measured them at the top with a range of 3.908-3.911" with a caliper. I know I need more measurements... I have a 3-4" micrometer coming. Where to measure them?
I'm hoping that I can either reuse the existing cylinders/new rings and deglaze bore with the flex-hone, or new cylinders/new rings and deglaze bore.
I did get a complete gasket/seal kit for the engine.
This is my first time diving into an engine so all advice will be greatly appreciated. Please keep in mind that I don't have the money to get any machine shop work done. This tractor had an oil pressure of 45-50 psi. It didn't smoke at all.
The bottom of the head and top of block were all black with carbon. The exhaust manifold was cracked between between 1-2 and 3-4 cylinders.
I also got a new clutch plate... the old one didn't look very good.
Hello,
I recently removed the engine to fix a rear main seal leak. The seal was done by someone dropping the oil pan. It wasn't offset at all and one side seal pin was not all the way in and bent 3/8" over. I found a bad rear main bearing and #4 rod bearing. After polishing, new main bearings, I used plastigage and got 0.002-.0.003" on the crankshaft main journals. Still waiting for rod bearings. I measured the roundness of the rear crankshaft journal and it was less than 0.001" with the fowler magnetic stand and displacement gauge.
I removed the cylinders to inspect them. It looks like they need replacement but please inspect the images and advise.
The cylinders are 0.040" over bore EAF6108J. I can't tell if there are sleeves or not. The block is C0NN6015J. I have read that these later model engines were sleeveless. Can anyone confirm this?
I know the cylinder bore is 3.901" + 0.040 = 3.941". Is there a +/- tolerance?
I have received a fowler bore hole gauge today but still waiting for the 3-4" fowler outside micrometer which I will get on Thursday.
Is there a tolerance on the cylinder diameter? I have measured them at the top with a range of 3.908-3.911" with a caliper. I know I need more measurements... I have a 3-4" micrometer coming. Where to measure them?
I'm hoping that I can either reuse the existing cylinders/new rings and deglaze bore with the flex-hone, or new cylinders/new rings and deglaze bore.
I did get a complete gasket/seal kit for the engine.
This is my first time diving into an engine so all advice will be greatly appreciated. Please keep in mind that I don't have the money to get any machine shop work done. This tractor had an oil pressure of 45-50 psi. It didn't smoke at all.
The bottom of the head and top of block were all black with carbon. The exhaust manifold was cracked between between 1-2 and 3-4 cylinders.
I also got a new clutch plate... the old one didn't look very good.
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