Model B Compression Release - Question
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    Model B Compression Release - Question

    New to John Deere - I dont have my tractor yet - its a 1937 Unstyled B, set to be delivered soon.
    Just curious - looking at videos of hand starting show a relief valve on each side.

    Did all the two-cyl. engines on the unstlyed B come with them?
    If not can you add them?

    Seems to me it would make it alot easier to start in this Michigan weather.

    The pictures I received did not show a close up of that area around the spark plugs.

    Thanks for your help..

    Ok if you can't tell I am a little excited to get my project..

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    44JohnDeereBR (01-29-2016)

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    Evergreen's Avatar
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    Your B should have them. You would have a hard time spinning the flywheel if they weren't there. The compression petcocks should be brass but might be hiding if they were painted over at some point.

    All letter series tractors except the M should have them if I'm not mistaken. I know all of the hand start models I have seen have them.
    '50 Model M w/electronic ignition, 12v conversion, and a 3pt conversion plus a homemade snowplow, a Deere Model 51 trailer plow, a Woods RM59 finish mower, a Bark Buster splitter, and a few other toys.
    '69 Sears Suburban 14 48" deck and 42" back blade, an estate rake, and a sweeper.
    '07 F250 XL Powerstroke, crew cab, short box, 4x4.
    '85 F150... I finally sold my very first truck after racking up over half-a-million miles on the original drivetrain.

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    MDrew's Avatar
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    It should have them and likely does. They are a little lower on the motor so they can spray out on the ground instead of all over the tractor.
    Mike

    Sometimes I'm only funny to myself.

    300, 140, 318, 430, 314, 110. Brinly plows, disk, 80 cart, couple of 49 blowers, 3 54 blades, 33 tiller, tilt dump MCS, HPX Gator, CS Gator, Model A. Struck MD 750 w/bucket and hoe.
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    Great- I was hoping they would be there, really makes sense as to the design and function of them..

    Thanks

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    B Petcocks

    Far as I know the older Unstyled B's (Before they became styled in 1939) DID NOT HAVE PETCOCKS

    In 1939 the styled had a slight bigger bore and more compression so only then did they use petcocks

    HOWEVER those older unstyled B's were not very hard to hand crank so petcocks weren't necessary

    My 1938 Unstyled Long Frame DOES NOT have petcocks but my friends 1939 Styled does.


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    John T Click image for larger version. 

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    BigJim55 likes this.

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    Beautiful Tractor- What is the chain for - Weights?

    Thanks for the information on the compression release- hopefully mine will be easy to start w/o them.

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    Quote Originally Posted by easygoin4 View Post
    Beautiful Tractor- What is the chain for - Weights?

    Thanks for the information on the compression release- hopefully mine will be easy to start w/o them.
    The front chain links on each side were used to chain/boom it down when hauling on my trailer. Your Unstyled B cranks relatively easy is why no petcocks were used. When right and perfect they should hand start the first or second pullover of the flywheel but many tractors will NOT.

    John T

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    Strange that they didn't have them originally because my great-grandfathers '36 short frame does. I wonder if someone upgraded the engine with a newer block or higher compression pistons to try and squeeze a few more ponies out of the old tractor.
    '50 Model M w/electronic ignition, 12v conversion, and a 3pt conversion plus a homemade snowplow, a Deere Model 51 trailer plow, a Woods RM59 finish mower, a Bark Buster splitter, and a few other toys.
    '69 Sears Suburban 14 48" deck and 42" back blade, an estate rake, and a sweeper.
    '07 F250 XL Powerstroke, crew cab, short box, 4x4.
    '85 F150... I finally sold my very first truck after racking up over half-a-million miles on the original drivetrain.

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    Quote Originally Posted by Evergreen View Post
    Your B should have them. You would have a hard time spinning the flywheel if they weren't there. The compression petcocks should be brass but might be hiding if they were painted over at some point.

    All letter series tractors except the M should have them if I'm not mistaken. I know all of the hand start models I have seen have them.
    My H I had did not have them.
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    But my 1947 B that I have does have them, hard to see but circled in red.
    Click image for larger version. 

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    Kind Regards, Gary

    Love old iron

    Building a 1/2 scale replica of a John Deere H.
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    I always forget the poor little model H!
    '50 Model M w/electronic ignition, 12v conversion, and a 3pt conversion plus a homemade snowplow, a Deere Model 51 trailer plow, a Woods RM59 finish mower, a Bark Buster splitter, and a few other toys.
    '69 Sears Suburban 14 48" deck and 42" back blade, an estate rake, and a sweeper.
    '07 F250 XL Powerstroke, crew cab, short box, 4x4.
    '85 F150... I finally sold my very first truck after racking up over half-a-million miles on the original drivetrain.

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