evinrude specks for rebuild 1957 fleetwin 7.5 hp

[duckland23]

Hi guys Im wanting to get all the specks for the touqe and any other specks I may need to rebuild my engine . I would also need the bore size , over size bore size too . piston ring end clearnce , rod touqe for bolts , anny outer cover touqe if needed . Please list everthing I would need it you can . I sorry to report that it did not change my compression reading from dry 30 psi . My wet was 55 in the two cylinders . Thats alot of work to do to the engine , But the good thing is that when Im done its going to be like new again . I'll make sure she runs on a heavy two cycle oil mix like 24:1 or 16:1 what ever that is in ounces of oil . I flowed the standard oil mix for two gallons of gas , But I only used less then 1 gallon from the time i owned her . Its only a month or so . I got her from craigslist .

 

[rockyrude]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Get the OEM service manual, it'll have everything you are looking for.

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Thats a really helpful answer .If I wanted a smart as* answer I could of posted else where . By the way I have the manual but im missing the things I posting about . But I when to my local libary and took the book out , it has all the specks Im in need of right now . I own a book i downloaded from the internet . Next time please dont post a smart answer llike that , for some reason you dont like the post look else where .

 

[Chinewalker]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

I second that - the OEM manual is a MUST if you're rebuilding the motor...

 

[wilde1j]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

You don't seem to have an OEM shop manual or you wouldn't have posted such basic questions. Good luck, you may need it.

 

[Chinewalker]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Not sure what was so smart butt about the above reply. The original engine manufactuer (OEM) manual for your specific motor will have the most detailed info - MUCH better than any manual you are likely to find at the library (although you are in Wisconsin, so I suppose it's possible you might have Evinrude manuals in your librarys - they were made in Milwaukee) and MUCH better than any Seloc or Clymer aftermarket manual could ever hope to be (and more likely the type of manual a library would have on the shelf). Your initial question was not info that someone was likely to have off the top of their head, but would require them to find their own manual for YOUR specific motor and list the specs you asked for - info that you should be able to get once you get your own manual, which you should have anyway. No smart butt intention, just good advice.

 

[steelespike]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

I'll third that. As I recall the oem manual has cautions regarding some procedures that are a big help to keep you out of trouble.
Some times the rings get stuck by carbon and a good decarb treatment with something like Sea foam will free the rings.

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

@Chinewalker

I understand what your telling me . Just thought I would ask of the info you never know untill you ask . Im always told to speak up when you dont know something . I got the bore spec for a manual clymer . It sould me the same as evinrude spec for the bore . I located the rings and want to rering the motor . The compression is to low for the powerhead to run the right way . I have checked my spark am good to go there carb is rebuilt . so I have a engine that someone before me that maybe did not use the proper oil mixture for it and wore out the rings . The rings dont seem to be in good shape , but my friend is comming over this weekend and he's a professional mechanic . I no if he says it rings are wore out im replacing them . End of storie . I love the engine anyway .and know that of it has new rings in it and new gaskets , its like getting a new engine .

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

@steelspike

I would never use sea foam in my engine ever . I seen on you tube engines that gone wrong . So Im apposed to using sea foam in my engine . Oil will free the rings too like a light oil to get under them . But may not break up the carbon , it will get some of it but not all of it . I seen crack pot things on the market like stp engine treatment and so forth . I know you can use keresene to remove carbon but I would not use it in a engine thats two cycle , only on automotive type one's , and there's a limit to that too . But hey thanks for you info on the factory manual . I wonce had a manual from audi for my audi 5000 and it was the hardest manual to understand too . Most of the info you could use , but most of it was useless to me and had to use a different service style for working on there engine . Most of the things they told you would not work for the at home saturday mechanic .

 

[tx1961whaler]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Can you chuck a socket onto an electric drill and try your compression reading again spinning the motor from the flywheel nut?
It is hard to get a good reading using a pull start.
Sea Foam won't hurt your motor.
Bore is 2 1/8"
End gap is 0.007-0.017
Connecting rod torque is 60-66 INCH-Lbs.

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

@tx1961whaler

Yeah thats what I got for the bore . But my rings are worn out they dont look right There's a little play in the pistons and pistons are to be tight in the cylinders . New rings wont hurt it anyway . Why would you say to spin it in a drill . I seen a guy on you tube do it from the pull start to get his reading . I would have to replace the gasket or use the old one for the test .

 

[tx1961whaler]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

I usually take the spark plugs out, take the pull starter off, and spin the motor with a drill using a socket on the flywheel nut. You'll get much more reliable readings that way, and you won't wear yourself out pulling on it.
You need a new head gasket anyway. If you put a new one on, you won't have to replace it again. Check to see that the head is perfectly flat with a piece of plate glass and fine sandpaper. Sand the head on the glass, and see if there are high spots on the head. Keep sanding (figure 8) until the head is flat (no shiny high spots)

 

[HighTrim]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Im going to reccomend you get yourself an OEM Service Manual as well. Even after you rebuild a whack of powerheads you still go back to it for certain things. There are many things you havent even thought of yet that you will need to know.

By the way, Seafoam is a fantastic product. Not sure what you read about it on the internet, but the source was misinformed. I have used it on hundreds of my 50's OMCS with great success.

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Yes the OEM Service Manual would do me some good , but the cost is like 45.00 dollars and its not cheap . I see they have it for sale on this website too . If I could find the a download for less money , like the manual I got , but its not the one for my 1957 evinrude fleetwin 7.5 HP engine .I once owned a 1987 or 1988 audi 5000s car from them and the OEM Manual was so hard to understand , it was like reading stereo insturctions for it . Most of the info was useless to me and some was . Some things the said was not true like cleaning the rack and pinon with new oil to remove the dirt form it to operate better that way . But with that said , Other things were usefull to me in it , like the factory spec's for the engine and so forth .

But sea foam Im not going to try at all , if you make a mistake you out of a engine big time . I wont try it on two cycle engine anyway .

 

[steelespike]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Lots folks here have done decarb treatments using Sea Foam and like products While some have had no improvement
I don't recall any negative results. Just follow the directions on the container.Many run it as a fuel conditioner.

 

[RogersJetboat454]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

I once owned a 1987 or 1988 audi 5000s car from them and the OEM Manual was so hard to understand , it was like reading stereo insturctions for it . Most of the info was useless to me and some was .

Comparing an OEM service manual for a 1980's German car to a manual written by Americans for an American motor built in the 50's is a completely apples and oranges comparison.

For one, the car manual was most likely translated from a German manual by someone who may know nothing about cars. Secondly the technical knowledge required to fix a 1980's German automobile VS an American made 2 stroke outboard from the 50's is night and day.

This isn't rocket surgery, and the factory manual for your rude isn't going to make it out to be rocket surgery either. It was written in a time when engines were simple, and you didn't need years of training to work on everything.

Clymer, and Seloc manuals typically cover a broad range of engines, and can be vague, or down right WRONG. $45 dollars may sound like allot of cake to you, but how much will it cost if the Clymer manual you have gives you the wrong spec, or leaves something out, and you end up grenading your power head? The other great thing about a factory manual, as long as you keep it in reasonable shape you can sell it and make most of the money you spent on it back.

I would have no reservations about using sea foam on a 2 stroke. In fact I would have more reservations dumping it in a 4 stroke. Used in moderation it shouldn't do anything but help clean the trash out of your engine.

 

[1946Zephyr]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Yikes, fella. Time to sit back and have a cold one and chill out. Never try and work on your engine, if you feathers are ruffled. It's only makes the job rougher.

I'm with these guys, buying a factory service manual is the best investment you'll make, during this whole rebuild. Like some of these guys said, it will do more to prevent catastrophic results later. The '57 Fleetwin was one of the simplest engines built and doesn't take much to rebuild, but if something isn't right, it'll nuke out on you and spoil a weekend.

And yes, Sea Foam is a good product. I myself have not used it, but since I've been here, I have heard nothing but good things about it.

If someone ran that engine with too lean of oil mix, it would be advised to check over the crank journals real good. The pistons are likely scored and the rings stuck because of that. That motor needs 16:1 mix to get the best longevity. You might check ring end gap, with a new set of rings, to make sure the cylinders aren't excessively worn.

The best thing to do, is pull 'er down and post some pics of what you have. Good guys here will be kind enough to help you out. Chinewalker is one of the smarter guys on here and has a lot of experience with these old classics. I, myself have tinkered with a few hundred of these, as well. OMC twins are my specialty.

I don't think anyone was being a smart *** about advising an OEM shop manual. They just gave good advice. Good Luck

 

[nwcove]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Thats a really helpful answer .If I wanted a smart as* answer I could of posted else where . By the way I have the manual but im missing the things I posting about . But I when to my local libary and took the book out , it has all the specks Im in need of right now . I own a book i downloaded from the internet . Next time please dont post a smart answer llike that , for some reason you dont like the post look else where .

:facepalm::facepalm::facepalm:! had no intentions of adding anything else to any one of the ops threads that deal with the same issue....but who said " doing the same thing over and over, expecting different results is ?"
i see nowhere in any of the threads any mention of replacing a 55 year old $15 head gasket???? ( just how many times can you do a compression test that way?) ....and yes this was a smart *** post.

( sorry guys...but... lol)

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

1947Zephyr

Thanks for your advice My freid is a professional mechanic and He looked at the powerhead and it was ok for rebuild . Im going to start to disassemble soon , Im waiting for a guy on her that has the rings or evinrude dealer to call me back . they have the rings in stock but have to order them from there warehouse . I measured the bore im within spec's for the standard size piston rings . My rings are worn out . My compression is low and head is fine for my engine . I would see a worn out crank if its worn out . I'll also check the bearings on the crank as well . I may start latter today in taking it apart . I need to take pictures of the disassembly of the power head , most of all the way the pistons come out of the cylinder , it very important to do .

 

[duckland23]

Re: evinrude specks for rebuild 1957 fleetwin 7.5 hp

Well guys I took it apart and its good for rebuild as of now . I'll let you guys Know how its going for now . I going to stop for the Night , I have to wait for the parts and gasket Im ordering from evinrude dealer in racine wi . I found a place online where I can get the gaskets for 40.00 its vintageoutboards.com . But Im going to need the top seal for the crank , someone never replaced it when they last serviced the coils . so now i have to replce that too .