1984 Evinrude 150xp.... help!!!

[stlouispondguy]

Hello. My name is Eric. Awhile back my Grandfather gave my his boat. Man my heart raced! He put this boat together with the help of my only uncle and myself, (when i was only 8). So has i was saying. I got this boat, my Grandfather tells me that the dont run, and it has been off the trailer in 2-3 years. So I spent a few hours working on this motor and i'll be damned.... I got it to start and idle on the hose. I was shocked. So next test was to hit the water. well..... This is where thing went bad. Well off the trailer she sounded GREAT and ran STRONG. for about 5-10 mins. Then she died. While Grandpa was towing me back I decided to try to spin the flywheel, it spun with ease. my heart sank. But then she restarted. At this point she was acking like she was either loading up(even with cover off i never smelled gas), or starving for gas. But was running. I put her back on the trailer. Today Grandpa stopped by and ask if I had check compression on this motor. I said no. So we did. This what I got starting with #1-40psi #3-80psi #5-60psi #2-70psi #4-80psi #6-45psi....... So what do i do now? I can do most repairs. I looking for advice. Again this is 1984 Evinrude 150xp, model# E150STLCRD. And from what Grandpa has to say it was the fastest model that was put out that year, even putting the 200's to shame.

Thank you for your time,
Eric.

 

[emdsapmgr]

Re: 1984 Evinrude 150xp.... help!!!

That 150S model was the high perf version of the 150, probably actually rated around 165. Had higher compression heads, and 175 carbs. The engine should normally have around 95 lbs of compression, so as it is, the powerhead won't make much hp at all. Before you condemn it for a major overhaul, pull the heads. Check the head gaskets for leaks around the compression rings. If the powerhead overheated the last time out, the head gaskets could be damaged and leak compression. If so, replace them and try the compression test again. When you have the heads off, inspect the cylinder bores for scuffing (aluminum transfer) from the piston skirts onto the cast iron. Check to make sure the rings are intact.

 

[stlouispondguy]

Re: 1984 Evinrude 150xp.... help!!!

Thanks for a quick reply. How long might a task like this take? Is there a way to get the necessary spec to check the cylinder walls?

 

[jonesg]

Re: 1984 Evinrude 150xp.... help!!!

Look for obvious signs of damage, scuffing , broken rings, gouges etc.

Too bad you didn't do a full service before running it like that.

 

[stlouispondguy]

Re: 1984 Evinrude 150xp.... help!!!

thank you for all the info. when checking these issues out do I need to pull the power head. or can I do all this while it is still in place?

 

[jonesg]

Re: 1984 Evinrude 150xp.... help!!!

Just the cylinder heads, not the whole powerhead.

 

[stlouispondguy]

Re: 1984 Evinrude 150xp.... help!!!

again thanks for all the help. i do have some work ahead of me. thanks for the info. ill be in touch to let you guys know the out come.

thanks again,

Eric