1964 60 hp evinrude problems please help

perron582

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Jun 6, 2011
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so i did a carb job with a new kit, replaced all the fuel lines including the tank line and bulb as well as the tank, i have been using sea foam in the gas since i got my hands on this motor, the problem is i only have about half throttle in WOT, i did a compression test and they are all within 10 of each other
#1 84 psi
#2 87 psi
#3 94 psi
#4 85 psi
i used a barrel to warm her up before the test for the first time (i was taking her to the lake up the road before) there was black oil on top of the water after i shut her off, didnt notice before cause i was on the lake, i then noticed that there is oil leaking from the exhaust gasket so i took off the heads and there wasnt as much carbon in there as i was expecting, no scratches or gouges on the pistons or cylinder walls, the #3 head has some pitting in behind the head, all the plugs have a little bit of oil on them except for # 3 it seems alot dryer then the rest, before i did the compression test i used a spark plug and wire tester and they where all getting spark as well as the wires, i held all the plugs on the block in the garage previously to see the spark as well, the timing marks are lined up as well< gonna try to up load a couple pics
not sure what to do next?
- could the leaking gasket b causing all of this?
- shouldnt all of the cylinders have a reading over 100 psi?
- dont know what to do next any ideas would be greatly appreciated,
- could i just have the cylinders honed and new rings put in as well as new gaskets?
she is a 1964 60 hp evinrude model #
 

fireman57

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Re: 1964 60 hp evinrude problems please help

You may have an exhaust leak at the bottom of the powerhead. Try running it with the cover off and see if it makes a difference. The black oil floating is normal. Compression numbers are fine. You want them within 10% of each other.
 

perron582

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Re: 1964 60 hp evinrude problems please help

more pics to have a look at my problem
 

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fireman57

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Re: 1964 60 hp evinrude problems please help

they don't look bad for a 50+ yr old engine. I credit that to the seafoam.
 

perron582

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Re: 1964 60 hp evinrude problems please help

sorry i meant to say that the exhaust gasket under the power head is leaking
 

fireman57

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Re: 1964 60 hp evinrude problems please help

Yes that is why I want you to run it with the cover off. It can't run on it's own exhaust because there is not enough oxygen. If you run it with the cover off and it runs fine then you have found your problem.
 

F_R

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Re: 1964 60 hp evinrude problems please help

Stop!!! That battered head is because some foreign object has gone through. It is possible that it is from an old wound that has been repaired, or it could be a major catastrophe about to happen if you continue to run it. Either way, you must determine what caused it. It is surprising that it has the best compression on that cylinder, which makes me think old wound.

As for black oil in the barrel, that is completely normal.

Your overall compression readings are ok. That is not a high compression engine to begin with.
 

perron582

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Re: 1964 60 hp evinrude problems please help

i dont think i can run it right away anyhow cause when i took the head off i also took the water jacket off the head to have a peek inside and the gasket came off in 2 pieses, looks like it was rotten and that it got really hot, i replaced the water pump when i first got her though, sorry im a newbie to out boards im not too sure what u mean by taking off the exhaust cover? the cover on the leg below the motor? or the flat, square cover between the cylinders?
 

fireman57

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Re: 1964 60 hp evinrude problems please help

No just the engine cover. Make sure you replace all torn gaskets before you run it.
 

perron582

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Jun 6, 2011
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Re: 1964 60 hp evinrude problems please help

well i replaced the gasket and took her to the lake and the same as before, starts and idles fine but as soon as u try to WOT, i only get bout half throttle.
any one have any ideas? i took the head off again when i got home and i can grab the pistons and i can wiggle them a tiny bit, is there suppose to be play between the piston and the cylinder wall?
 
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