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cylinder boring 1970 60 hp

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48tony

Regular Contributor
hi i just ripped my 1970 60 hp down to every last bolt.i took the block to the shop to get it spec out. they told me a bore of 30 over would be needed. so i was on the hunt for 30 over pistons .i hooked up with this guy in florida he said he had 2 very nice low hour 30 over pistons . i allso needed piston rods because the old ones were junk do to bearings wereing on the lower rod.so at a very fear price i stepped up on the deal. thinking i would just have to buy one more 30 over piston and rod. and new sets of rings for all 3. he called me up and me he had made a mistake on his invotory. come to find out he has 1 30 over and 1 40 over piston he tells me to have my cylinders bored to fit . is this something i can do with out any problems . allso wondering what to bore the last cylinder at 30 or 40 over if this is something i can do with no problems.and in what order should i do this in.30 40 30 -30 30 40 depending what the last bore is. thank you.
 
hi joe. the shop said 1 cylinder had a deep score and they said 20 thou over may not do. the other 2 did look ok but a bit worn. so the shop said i should bore all 3 at 30 over.this is were my last qustion comes in a guy told me he had 2 30 over pistons and rods that will fit this 60 hp. comes to find he has 1 30 over and 1 40 over the price is real good .i was not sure if it was posible to bore cylinders at different tollerances. after asking around i guess this is done a lot on outboards.so now i am going to ask you .this guy just called me this mornin with more news . he said he found a set of all 3 at 30 over but was a bit un sure if they will fit . i hope to hear from him soon with info. sorry to make this confueing.but i really have no clue.do you no what numbers on the pistons need to be in order to fit a 1970 60 hp. these are the 30 over . any info will help.
 
1970 60hp Evinrude/Johnson.... Original & Superseded part numbers.

.020 O/S Piston = 384249 = 386257 - $137.39 (2004 Price) <- I have none of these left.
.030 O/S Piston = 384299 = 386260 - $105.61 (2004 Price) <- I have none of these left.

.020 O/S Ring Set = 384247 = 396378 - $34.97 (2010 Price) <- I have 2 of these left in my remaining stock.
.030 O/S Ring Set = 384300 = 396379 - $39.97 (2010 Price) <- I have 1 of these left in my remaining stock.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
 
hi joe . thank you for the piston info. these numbers should help me find out if the 30 over pistons this guy has will work for me.are the numbers casted in. allso are these numbers the only ones that will fit or are there other numbers that will work. after looking for parts i have come to find that other part numbers sometimes dont make a difference. same part just different numbers do to year change. just trying to cover all my bases.i really want to get these 30 over pistons.i never herd back from him today. hopefully i will talk with him tomorow. i will get the numbers from him and let you no what i come up with. i will be looking for the new crank bearings for the crank i got from you. think you have them if so let me no ok
 
The numbers that are cast on the pistons and connecting rods are just that.... casting numbers. These casting numbers have nothing to do with part numbers. The only time you would refer to a casting number is if you have a faulty part with the casting number and can compare that number with a casting number on a good part.

The numbers that I have listed above for you are absolutely the only numbers that you can use on that 1970 60hp model. Do not attempt to use a piston or ring set with any other part number. What I have listed are the original 1970 part numbers and the later year superseded part numbers..... there are no other numbers regardless of what someone else may tell you.
 
linesix said:
No offense Tony but can't you find a nice used motor for less than it will cost to rebuild this 40 year old one? This guy has it listed new for $60. OBO if you really want to go that route.

http://www.sportslinkup.com/shop/0-Omc-pn-1-NEW.html
Click to expand...

i got this motor for 50 dollars .it has been a labor of love so to say. i have sunk a bit of cash into her at this point there is no turning back. after i do the power head i will have a new motor. i no it may seem foolish to sink cash into a 40 year old bucket but like i said i am injoying it and learning a lot along the way.
 
48tony said:
i got this motor for 50 dollars .it has been a labor of love so to say. i have sunk a bit of cash into her at this point there is no turning back. after i do the power head i will have a new motor. i no it may seem foolish to sink cash into a 40 year old bucket but like i said i am injoying it and learning a lot along the way.
Click to expand...

Enough said. One word of advice. Before you go too far, make sure the gearscase works. They can be big $$$ to fix if they don't.

Enjoy your project. I have a few of my own.
 
the lower unit when i first got it had water in the type c oil.i put new seals in the unit and it still leaked .put it in the shop and they told me the gasket over the ele silonoids was the prob.get it back and it still had water prob .at this point i am pist .so i just kept putting fresh oil in it at 8 bucks a quart it got costly.i took it off again to go even deeper some one did a patch job with a weld.i went on ebay to shop for one and you have to dig deep in the pocket to get a good used one.so as my story goes i found one at a good price it came off a 69 55 hp.i get it and put it on to find thje same prob.at this point i am real pist the guy said it worked fine. so i did the same seak kit on this one. still water in the oil.pres test pass so i am at the point for a big hammer.after finding this i read a lot of lower unit prob. comes to be the bearing under the water pump was bad it only leaked when the shaft turned so it would pass the test so pressed out the bearing from the housing and 20 dollars later i have a waterproof gear case thanks to this site
 
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