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Thread: 1928 JD Motor

  1. #1
    Join Date
    Jun 2017
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    17

    Default 1928 JD Motor

    Hello! My name is Mitchell Skeene and I am 21 years old. I am attending Mount San Antonio College and am studying aeronautics. I am a student pilot and am working towards earning my private pilot license. I just purchased this 1928 JD motor and would love to build it up one day. I have lots of question regarding the engine and about the parts I need to make it complete. I know there are some issues with the motor such as the broken motor mounts and there are a few small cracks in the engine block. I don't know if these are easy repairs? Also I have been considering buying a cam cover for the motor, but I have seen a few variations of cam covers so I am not sure what type I need and what year parts will fit the motor? Any information will help, thanks!
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  2. #2
    Join Date
    Nov 2008
    Location
    Virginia
    Posts
    400

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    Mitchell,

    Welcome and good luck with what will be a great project. There are plenty of folks on here who are J motor folks and can help with knowledge and parts. I am sure they will chime in shortly and help you get going on your project. I may take a while but don't get discouraged and keep plugging a way even if only a little bit at a time.

    Tom (Rollo) Hardy
    AMCA# 12766

  3. #3
    Join Date
    Sep 2005
    Location
    Sarasota, Florida
    Posts
    3,474

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    Welcome Mitchell, I built my '48FL by starting with a pair of gas tanks; and also built a 1920J from the motor, up. Like Tom said, it takes longer, and will probably cost more, but there is a lot of intangible satisfaction to be had from doing that. I've also seen a lot of people who bought complete motorcycles, only to find out everything is mismatched, or worn out. So, now you have the opportunity to do the research to get the right parts, dig through thousands of boxes, and millions of dirty motorcycle parts, at motorcycle meets all over the country. Welcome to our world
    Last edited by exeric; 06-14-2017 at 09:42 AM.
    Eric Smith
    AMCA #886

  4. #4
    Join Date
    Nov 2015
    Posts
    16

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    Mitchell! Good work on buying a JD! It's a bit more unique and fun than anything else I've built that's for sure. Looks like you have a great start to an engine. Those motor mounts are kind of a pain unless the right guy is on the job. They have to line up perfect with the frame so there isn't any torque stress on them once they are bolted in. But like anything, the right fixture with the right aluminum welder can make it happen for sure. You could buy one of the reproduction keystone frames that Period Modified sells too. Those frames mount through the engine bolts I believe. All depends on the direction you want to take. If you have any family members with a mill and a lathe cash in those favors because you'll spend hours jigging up things just to take few thousands out of something to save an original part!

    Keep an eye out for a decent set of cylinders, the JDJUGS are nice but were not in my college budget...

    That pinion gear is LH thread just in case you don't know.

    For the case bolts I took a socket and milled slots out so that they fit into the two holes on the nuts. They are 1/4-24. 24 pitch is rampant all over that bike.

    You'll want the cam case that has a little flare inside the case by the generator gear (correct me if I'm wrong). I have a rough one if you need. The cover with the oil feeder is the adjustable, kind of looks like the VL oil pump. But any steel one will do. There's a few guys in the Hells on Wheels MC that have J's. I'm not sure who else does in the LA area.

    Good luck and don't loose faith in the J, it'll be worth it.

  5. #5
    Join Date
    Aug 2013
    Posts
    480

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    Hello Mitchell ! Welcome to the forum, it's great to have young folks interested in these old machines. You are in the right place to begin your efforts, there are a tremendous group of very fine and knowledgeable fellows here. i just finished my 1927 JD May 10th, after nearly 4 years and 500+ hours, not including joining and researching this forum, researching available info on internet, collecting/studying literature. i began my project August 10, 2013 with an engine, transmission, frame and front/rear wheel hubs. my LH case had a pair of "V" cracks at the rear lug that extended in to the belly of the case. if you go to "member bike builds," you will find my "27 JD Restoration" thread that will give you an idea of the condition of the parts i started with as well as progress throughout the project. My research of this forum of other member's builds, even non-JD builds was most helpful. i highly encourage you to read and learn everything you can find and ask for help when you need to. as you begin, having a copy of the 1927 and the 1927-31 parts book you will find indispensible. when looking for parts and asking questions, i found it necessary and very helpful for questions i had, to refer to parts numbers and descriptions of the parts as in the factory parts books/literature. EVERY bit of research you do will build the foundation for the successful completion of your project. Know that your engine (and the rest of the bike) will be a piece by piece build, not a simple matter of buying parts and putting them together. At least in my case, every part had to be inspected, then fitted to the part it corresponded to, sometimes spending hours on a single part to make it right. The process is slow going and taught me more patience and perseverance than i sometimes thought possible. Each and every step you complete is one more step towards completion. in my case, to keep myself organized and minimize brain damage, i had plan in advance of starting out and kept a notebook to log the various steps, procedures, aspects i was juggling simultaneously. Another excellent resource is JD Yahoo Groups, i encourage you to join them and introduce yourself there. There are a number guys here who have real passion for things JD. if you go to page 16 of my build thread, you will see the list of people who helped me get my '27 back on the road. all this being said, the first time i stepped on the starter pedal and the engine roared to life was a GREAT MOMENT ! If you click on the link below after my name, you will see the JD on it's 1st trial run, last August.
    Last edited by Steve Swan; 06-14-2017 at 02:14 PM.

  6. #6
    Join Date
    Jun 2017
    Posts
    17

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    Thank you for the encouragement Eric! I can't wait to get started!

  7. #7
    Join Date
    Jun 2017
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    17

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    Thank you whp! I appreciate the information. Do you have a picture of your cam cover?

  8. #8
    Join Date
    Jun 2017
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    17

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    Steve, thank you for all the information! I have been going through your build pots and I am learning so much from that already. I will definitely get a copy of the 1927-31 parts book. Thank you for all the help and encouragement!

  9. #9
    Join Date
    Aug 2013
    Posts
    480

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    Quote Originally Posted by MSkeene View Post
    Steve, thank you for all the information! I have been going through your build pots and I am learning so much from that already. I will definitely get a copy of the 1927-31 parts book. Thank you for all the help and encouragement!


    Don't hesitate to ask questions, we all learn from what we share. and if you need resource contact info, i have 4 years accumulation and other fellows here know resources i don't know of.

    if there is such a thing as a 28 parts book, i would suggest getting a copy to supplement supercessions that may have occurred in the 27-31 book and hence not noted or pictured in the 27-31 book.

    attached is a picture of the steel gear covers. the top one with the pyramid shaped notch behind the mechanical oil pump is what your 28 should have. the bottom cover is for earlier models, pre-26 i believe, but i may be wrong.

    20160227_202302.jpg

    also attached is the earlier gear case which i have in my engine. the later gear case will have the corresponding "pyramid" cast as part of the case. the hole at the rear of the case is where the generator shaft goes through and if a puller isn't used when removing the generator gear, the thin lip of that hole gets broken out.

    20160301_144408.jpg
    Last edited by Steve Swan; 06-15-2017 at 08:31 PM.

  10. #10
    Join Date
    Jun 2017
    Posts
    17

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    Steve, I will start searching for a 28 only parts book. Thank you for the clarification with the pictures! I never noticed the pyramid shape before! From looking at your pictures and other pictures now I can clearly see the difference. Thank you

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