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John Deere Tractors Discussion Forum

Early John deere B Tappet Oil line

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01-02-2021 08:14:37

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A 1946 John Deere B came to me partially refurbished.

A Previous mechanic (who is unknown to me, as this tractor has been thru two previous owners) had used 1/4" OD copper tubing from the oil pump thru block and head, which terminated with a compression nut where it connected to the tappet oil supply. My question concerns the transition from the block into the head. What was the factory original connection? It would appear that the two faces should over lap the holes so the oil would pass thru. However the oil passage thru the block sits lower with not enough surface to make a flush seal.(and this is same passage is used for the oil return) Block casting # B1305R, Head Casting # B2501R. Any ideas as to how I should remedy this, so the oil flows correctly to the front of the head. The earlier mechanic's method will result in major tube Kinking at the head block transition.

Thank you for your time

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George by Geneva, NY

01-03-2021 15:40:01

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 Re: Early John deere B Tappet Oil line in reply to Wayne53beard, 01-02-2021 08:14:37  
It appears that your tractor has mixed parts on it. The block is not the mate to the head you have, thus the problem. Can you get the cast number off the block, head, and the main case, where the crankshaft and transmission live? Some picture of the rest of the tractor will help determine which group of serial number machine you really have. A pix of the front side of the governor housing would help too. Is it a 4 or 6 speed? That will help a lot. I am guessing you have a 4 speed, early styled, made in 1939or 1940. 41 up had rocker oiling thru the head.

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wore out

01-02-2021 20:08:50

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 Re: Early John deere B Tappet Oil line in reply to Wayne53beard, 01-02-2021 08:14:37  
Many years ago (probably about 45) I owned a styled "B" with a mis-match of part numbers by serial number of the block and cylinder head for that particular tractor and someone had installed a similar, separate, non-OEM line in a similar fashion.

The tractor is long gone, and I have no record of the part/casting numbers to look back on.

Have you looked at a parts catalog to see if your block and head are correct for each other and for the tractor's serial number?

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01-03-2021 11:23:35

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 Re: Early John deere B Tappet Oil line in reply to wore out, 01-02-2021 20:08:50  
Best i can tell from the Parts catalog they appear compatible. You explanation warrents further investigation.

Thank you

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01-02-2021 18:02:28

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 Re: Early John deere B Tappet Oil line in reply to Wayne53beard, 01-02-2021 08:14:37  
Wayne53Beard In front of the head in your picture is a hole below the center stud. This is where the longer stud goes. Item 38 washer goes over that stud and elbow connects to it. Oil tubing connects to it. The oil washer just fits loose on the head and nut torques it down. There is a slot all the away this washer so oil comes from the head around washer out to tubing. The 37 pipe screws into the front of the block. The oil goes through head. What you show should work if the tubing goes through oil return and up to the tappet oiler. Lynn

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01-02-2021 10:47:29

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 Re: Early John deere B Tappet Oil line in reply to Wayne53beard, 01-02-2021 08:14:37  
There is an internal line that goes through the block. www.jdparts.com Model B parts book, page 6, item number 37- H 743R

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01-02-2021 12:13:30

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 Re: Early John deere B Tappet Oil line in reply to Mark-IA, 01-02-2021 10:47:29  

That is correct, Question is the Connection from that pipe to the passage in the head.

i.e the span from H743R to A2534R

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01-02-2021 10:20:35

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 Re: Early John deere B Tappet Oil line in reply to Wayne53beard, 01-02-2021 08:14:37  
All the early B's I'm familiar with have an external line that runs from the governor to the valve cover to oil the rockers arms.

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01-02-2021 12:16:18

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 Re: Early John deere B Tappet Oil line in reply to deeretails, 01-02-2021 10:20:35  
The best we have been able to date this tractor is 1946.

There is a fitting suppling this line straight from the oil pump.

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