• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

2. Old threads should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís thread (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new thread of your own.

4. If you have a question for the original poster (OP) and the thread is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old thread.

5. By starting your own thread, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

OMC Tech please help.. Which Rings for '62 Lark 40 hp

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • OMC Tech please help.. Which Rings for '62 Lark 40 hp

    Hi Gents,

    I started another thread because the other was also related to another question plus new info.

    I am working on a 1962 Evinride Lark IV M#35530 40 hp.

    I have also posted on several boards as well as checking with a few of the suppliers I have ordered from and nothing! This is a good one for the OMC techs.

    On my 1962 I have been comparing to BRP parts catalogs for 1968 models because as you know they only go back to '68 and it seems like the rest of the world only goes back to 1968 too! I wonder what happened... it's not like any Evinrudes were made before 1968 or anything!! I bet that the day that BRP sat down to upload all the old OMC data they were just overwhelmed by the sheer amount of data and had to draw the line at 1968. Also from what I have seen, OMC was always making changes, especially in late 50's and early 60's so I am figuring (and hoping) that is what happened here. Would love to hear any old OMC stories... really hated to see them go out of biz to another company just because they happened to be the first ones standing there with the cash! Anyways would also love to hear why in the heck BRP only goes back to 1968 if anyone knows.

    I have an original parts manual for my 1962 (not a copy)... nearly EVERY part number is the same as the 1968 on BRP's parts catalogs so thus far it's been pretty easy.

    Except for these:

    My 1962 part numbers from my '62 evinrude parts manual:
    Rings #378430
    Pistons #378695
    Block #378647(cylinder & crankcase)
    OS Rings #378433
    OS Piston #378697
    Crankshaft #554326

    1968 part numbers:
    Rings #380108
    Pistons #383068
    Block #380253 (cylinder & crankcase)
    OS Rings #380109
    OS Piston #383069
    Crankshaft #311356

    Now, as I said nearly evey other number is the same.. all the way down to the last screw... except these! The oversize ring/piston numbers are also different as you see, as is the crankshaft.

    Did OMC just change the part numbers? I can find NO cross-reference on anything so I am thinking they were changed.

    You see, the issue is that I have two bad 1962 blocks (scored cylinder and no compression in one cylinder). So if anything I need to bore the bad cylinder and go oversized but same problem.

    I also have a line on a good '68 block so that would allow me to order the '68 rings but I want to use my '62 pistons and crankshaft (and I also need to mount the block on my existing lowerleg (exhaust housing) and wouldn't you know, those #'s are also different 1962: #377988... 1968: #379385).

    These items all appear visually identical of course.

    Will my 62 pistons and 62 crank fit the 68 block and...
    will the 68 rings fit my 62 pistons?

    I have been able to order tons of 1968 parts and they all marry my '62 perfectly... only these hard engine parts are giving me trouble.

    Any help GREATLY appreciated. I got this motor for $25 and thought I was getting a good deal but it's turned out for me replacing nearly everything!!

    ALSO: Now take a look at this... the Rod for the '62 is #378541 and the '68 rod is #378275, different numbers... BUT... the rod split bearings (#378528) are the SAME... AND... the center crank split bearing (#378838).. wow, light at the end of the tunnel! I bet they'll fit and I bet they changed the numbers, anyone know?

    Thanks a million All,

    Shawn T
    Wichita, KS


  • #2
    Re: OMC Tech please help.. Which Rings for '62 Lark 40 hp

    This is now a duplicate post since moved. I did not see a delete option in edit.
    How do you delete or can you delete? Thanks.

    Comment

    Working...
    X