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John Deere Tractors Discussion Forum
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Someone set me straight.

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NEKS

11-25-2012 18:22:12
71.0.218.65



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Just heard today that all B JD's did not have petcocks on the cylinders. A's and G's did. Grandpa had a early styled B and it had petcocks you closed after starting. If B's had them they were installed later. Set me straight. Thanks




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bob in oakboro

11-26-2012 17:57:09
69.40.238.228



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Our 35 B did not have them.



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craigco

11-26-2012 15:44:15
69.171.160.47



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
My Grandpas 35 doen't have them. My 48 didnt have them but the block is tapped on the bottom for them. Had to install some when we bumped up the compression. The bottom one are a pain to use and always drop oil when you open them.



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Neven

11-26-2012 13:42:03
99.69.204.240



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
My 48 B has them under.



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Dalet

11-26-2012 07:01:37
184.94.141.146



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
35 B here without petcocks.



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John T

11-26-2012 04:53:49
216.249.82.117



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Best I recall the Unstyled 38 and older had them, but in 39 when they styled them they also increased the bore and resultant compression and thats when they added petcocks, i.e. beginning with 1939 Styled.

John T



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James Howell

11-26-2012 02:41:02
75.224.215.180



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Our 39 and 40 Model B have them on the side.

Our 43 Model B has them on the bottom.



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davediehl@hotmail.com

11-25-2012 23:40:13
173.30.129.61



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
My 51 does not have them.



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rickdeere

11-26-2012 04:37:39
216.163.13.87



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 Re: Someone set me straight. in reply to davediehl@hotmail.com, 11-25-2012 23:40:13  
There on the bottom of the block with plugs in the holes.



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jturbo10

11-25-2012 22:22:41
67.232.123.92



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Our 39 styled B had petcocks.



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jturbo10

11-25-2012 22:22:16
67.232.123.92



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Our 39 styled B had petcocks.



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Lee B

11-27-2012 01:58:52
64.37.30.36



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 Re: Someone set me straight. in reply to jturbo10, 11-25-2012 22:22:16  
Same here, same here. :)



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Kurt_JDB

11-25-2012 20:59:39
74.167.224.109



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
My 1937 and 1938 unstyled B tractors do not have them, and the block is not drilled and tapped for them either. My 1951 B does have them, but I hardly ever need them.


Kurt



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Paul from MI

11-25-2012 19:45:09
204.106.250.243



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Unstyled B's did not originally have petcocks. There is a flat spot on the side of the cylinder that may have been drilled & tapped later to add them. My '37 B with original low compression pistons cranks very easily with out them. Not so on my '44 B with gas pistons, it needs the petcocks.



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F-I-T

11-25-2012 18:59:59
184.6.247.3



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
FSB 178, April 1951 said that compression relief cocks were no longer being supllied on A,B,G tractors as they not of general use, and as an effort to conserve copper (Korean War), but they could be ordered as replacement parts if required, so pipe plugs were installed into the machined ports. I THINK that early "B"s did not have them added into the block until l ater, but there is mention of an improved design being introduced in '39. A different angle attempted to blow the fuel and oil away from the tractor.

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CLW

11-25-2012 18:51:41
108.206.122.51



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
If I remember right they may have done away with them on the very late models. If they did there would be a plug where it would have been. You could remove the plug and install one if needed. My 52 A had them on the bottom of the engine. I don't remember the 1950 model B I grew up with having them but never looked under it. One thing not many are aware of is the B had a conversion kit that allowed for 2 Batteries under the seat.
This post was edited by CLW at 20:32:32 11/25/12.

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B-maniac

11-27-2012 07:11:59
216.246.172.8



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 Re: Someone set me straight. in reply to CLW, 11-25-2012 18:51:41  
My '50 B has them on bottom.Only used them once when float hung open and had to purge raw fuelout before starting. New float had to "find it's home", never did it since.



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gtx1967jewison

11-25-2012 21:38:06
174.225.131.141



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 Re: Someone set me straight. in reply to CLW, 11-25-2012 18:51:41  
My 48 B has them underneath. Owned it for years before i cleaned off the gunk & found them ;)



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teddy52food

11-25-2012 18:36:36
184.94.175.179



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  

My 1935 does not have them.



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David G

11-25-2012 18:33:36
205.215.206.18



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
I had a 51 that had them.



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BushogPapa

11-25-2012 18:27:08
173.88.51.117



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 Re: Someone set me straight. in reply to NEKS, 11-25-2012 18:22:12  
Maybe not "All" of them did, but I bet "Most" of them did.. Would have been stupid not too...!!

Can hardy believe, the 60/630's didn't have them from the factory..

Ron..



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Bob Harvey

11-26-2012 08:00:09
209.121.225.241



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 Re: Someone set me straight. in reply to BushogPapa, 11-25-2012 18:27:08  
My '53 60 has the plugs on the bottom.



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rickdeere

11-26-2012 04:40:06
216.163.13.87



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 Re: Someone set me straight. in reply to BushogPapa, 11-25-2012 18:27:08  
look on the botoom of block and plugs should be in holes,now I never seen a power block with them.



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