evinrude probs

[dtro]

I bought a '94 sea nymph with a 70hp evinrude w/vro in May. It ran perfect for the one tank of gas I ran through it. I finally got a few days off to go to go on a fishing vacation. Yeah you guesssed it, first trip out, got about a mile away and stall. Limped it back to mechanic and he said "no prob, just powerpack",so I picked it up, put it back in the water, and it wouldn't idle. Gave up, and came home early. Brought it to local mech here and he says #2 is badly scorched, needs complete rebuild. I didn't have any alarm go off for vro. How could this just happen out of nowhere. Do I just chalk it up to bad luck? Contact seller? (Private party) Second opinion? Any thoughts on rebuilt engines would be appreciated.<br />Thanks<br />Darren

 

[Evinrude Boy]

Re: evinrude probs

3 words water pump impeller<br /><br />------------------<br />Jess

 

[clanton]

Re: evinrude probs

What year motor?

 

[dtro]

Re: evinrude probs

The motor is a '94. So it might have been the impeller. My first thought was the VRO?

 

[dtro]

Re: evinrude probs

There is still water coming out the **** hole, wouldn't that rule out the impeller?

 

[clanton]

Re: evinrude probs

One more question? Does the tattle tale hose come out the top of motor left side. The 70 hp motors have a list of Sbs as long as my arm.Also check pickup tube in fuel tank. This engine should have S.L.O.W. which means when it gets hot cuts rpms back to 2500/3000.

 

[Dhadley]

Re: evinrude probs

These motors run a tad lean in the mid range and it usualy effects #2 cylinder. Lots of things can trigger your scored piston. Spark plugs other than Champion, old fuel, fuel other than recommended octane, incorrect timing or "overpropping" to name a few things.<br /><br />Once you rebuild it and have identified and corrected the cause, consider changing the mid range jet. The stock jets should be 55Ds. I would drop them to 53D's or so to richen up the mid range. They are air jets so going smaller will richen the mix.<br /><br />Good luck!

 

[dtro]

Re: evinrude probs

This site has been great for helping me learn about boat engines. I just wish I would have found it before my problems. I brought my boat to a few people, and for the most part had the same results. Compression is 120# 60# and 120#. After getting many estimates on a rebuild, I happened to stumble upon a neighbor (I am new to the area) who is a tech fulltime and works on the side. Alright! He spent some time with me explaining "all the moving parts" and told me he could do it for about 1500. He also did a leakdown test and took the head off and showed me the actual damage. Belive it or not I had a marina tell me they would charge me $384 to do that, he did it for nothin. Leakdown was marginal on #1, awful on #2 and good on #3. The wall on #2 was pretty rough. Oh, and another thing the tattletale was on the bottom and should have been moved the the top. I have also decided to disconnect the VRO and premix. So does the 1500 sound like a decent deal? He also told me he would ream out the carbs for a richer run.<br /> Thanks to all on this site. I learned a lot. I am now addicted, I look at the messages everyday!<br />Darren

 

[Big Four]

Re: evinrude probs

My guess is the engine has never seen a carbon remover like OMC Engine Tuner or Seafoam. Number two piston's ring carboned up. When this happens the carbon insulates the rings from the piston. They can't disapate heat. They swell and grab the cylinder walls scoring them. This is what your feeling when you said rough. A good dose of the above every 50hrs will keep her clean.<br /><br /> Usually when a VRO go's it affects all the pistons and bearings. This doesn't seem to be the case here. Personaly I dosconnect any VRO I get near because I think their a waste of time. It's not the VRO's that are bad it's the crumby alarm systems that go with them. Their either going off for no reason or not going off when you need them.<br /><br /> I'd go back to first dealer that replaced the power pac and get the old for a spare. I doubt you'll get your money back, but having spare never hurts. 1500 is good price. Should include new rings for the top and bottom cylinder and new piston for the center jug. Block should be sent out and bored to clean up that center cylinder and the other two honed. Pistons can be bought in 3 different sizes. .010, .020, and .030 oversize. Make sure this guy is aware of this, I'm sure the machine shop will know. Only have them bore her as much as needed. To many mech's just bore them .030 to make sure they get it clean when sometimes .010 is plenty. It depends on how deep she is scored. Remember the engine will need to be broken in just she was new with double oil(24 to 1) for the first 10-15hrs.

 

[dtro]

Re: evinrude probs

Sounds good. For the price he quoted me, he told me he would replace all pistons and rings, have all three bored out, rebuld carbs with new kits and ream them out, also would move the telltale to proper spot. He sounds very knowledgeable, and told me I would have a "better than new engine". He said he'd back it up for a year also.<br />Thanks for the info!<br />Darren

 

[thirdma]

Re: evinrude probs

hey dtro..<br /><br />i completely agree w/everything that big four/dunk has to say. the only thing i would add would be to get a warranty in WRITING!!! i can't remember who it was, but i will i find it and reference the post of someone who bought a rebuilt engine (similar, but different) and had MAJOR problem when something went wrong. anyway, sounds good to me.. the next post should be from me w/the previously referenced post.<br /><br />mason<br /><br />formerly thirdm<br /><br />------------------<br />...if you learn from your mistakes - pretty soon i will be a genius...

 

[thirdma]

Re: evinrude probs

here it is.... the post is currently on page 3 and is titled "someone please help me!!" by b.gagnon. i seriously suggest you read this before you give someone 15 large.....<br /><br />good luck<br /><br />mason<br /><br />formerly thirdm<br /><br />------------------<br />...if you learn from your mistakes - pretty soon i will be a genius...