Yam150 Submerged, then running, now problem

[mojoman]

I've got an '88 Yamaha Pro-V 150 on my bass boat. It was submerged for about 8 hours. I pulled it out, cleaned out the cylinders, drained carb bowls, emptied fuel tank and filled with new gas, and changed fuel filter. The oil tank doesn't seem to have taken on any water. It cranks and runs fine. If I run it up to 4000 rpm it runs for about 2 or 3 minutes and dies. I am having a problem with the main battery (I've been jumping it using the trolling motor batteries) and I'm going to have a load put on it today to see if it's shot. It almost sounds like a knocking when it's dying. I've been searching the forum but I'm not having much luck. Any help is appreciated.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Well, I put a new main battery in (old one was bad) and had a little trouble starting it but it finally cranked. There was some fuel and oil coming out of the exhaust. A couple of the plugs looked fouled so I replaced all of them. Now it only goes up to about 1500 rpm under full throttle. I've got good fire and I checked all of the connections but it won't plane off. I checked the CDI per the manual but the connections ohm out ok. The auto choke is operating also. Any ideas?

 

[rodbolt]

Re: Yam150 Submerged, then running, now problem

sounds like it still has water in a fuel bowl. or the bowls are running dry. if the bowls are dry test the fuel pumps and then bypass the fuel connector. the oring in the engine connector can fail and stop it up

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Thanks. I'll check it out tomorrow and let you know what I find. If this Carolina weather holds up that is.

 

[classic 24]

Re: Yam150 Submerged, then running, now problem

you really need to pull the carbs to get all the water out of them. just draining them won't do it.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Well I couldn't figure it out so I took it to the local shop. They tell me I've got zero compression on one cylinder and it looks scuffed in there. They said my oil injection system had been injecting water into three of the cylinders and caused some scuffing in all three, but five of the six have compression. They want to bore the walls and put in oversized pistons for $3000. A second or third opinion from you guys would be great.

 

[Elmer Fudge]

Re: Yam150 Submerged, then running, now problem

You obviously ran the motor prior to getting all the water out. why not try and find another motor and use that one for parts.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

So I couldn't get the water out and try to fix the problem? Sorry if I sound ignorant, I've been working on Harleys for the past ten years and I'm just learning about outboards. I don't know the extent of the damage but does the 0 compression on one cylinder mean I should junk the motor? Seems like Yamaha 150's are expensive.

 

[Elmer Fudge]

Re: Yam150 Submerged, then running, now problem

If it's going to cost you $3000.00 to fix, surely there is much more wrong with that motor, you could possibly buy a used boat and an equivalent motor for not much more, all that i'm saying is look at various options.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Thanks for the advice, it's certainly an option. He said that only one cylinder was scored and he didn't say how bad but he wants to bore all of them and put in new oversized pistons. I don't really know these folks but I'm trying to give them the benefit of the doubt. He said the pistons would be well over $100 each (Wiseco) and that's really the only figure I have to go on. It would be great if I could just pull the head and change out the piston and rings but I don't know the actual condition of the cylinder until I pick it up tomorrow. And I'd rather hear from you guys that are more experienced with outboards before I take two steps forward and three back.

 

[Elmer Fudge]

Re: Yam150 Submerged, then running, now problem

I wish that i could be of more help, i am not an outboard tech, however i have gathered quite a bit of info from this place in the couple of years since finding this forum, i'm of the opinion that one should not spend more on something beyond its worth.<br />I hope that one of the pros do come along and give you some idea on what would be a viable option.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

I agree 100% and I can honestly say I've learned a great deal just searching this place for the past few days. I appreciate the good wishes and I've got my fingers crossed that one of the pros stops by. Looks like there's more than a few here that know their stuff.

 

[rodbolt]

Re: Yam150 Submerged, then running, now problem

hello<br /> forget you can spell harley and automobile and its a lot easier. compared to that yamaha your harley is a briggs and stratton. however its an easy motor to rebuild and really does not require a boat load of special tools. IF it will come apart. we know the oil pump is trash and it takes a oil pump kit now.<br /> we know that most likly all the piston pins and wristpin bearings are trash. the bottom main I always change anyway. if the crank is not damaged and the block is boreable you should be able to overhaul it for less than 1500 yourself. the main problem is you ran it with no oil and worse added water. a harley may live from that but not a two stroke. if you attempt the repair yourself I would get a clymer manual and a factory manual and read both cover to cover until you understand how and why the subsystems work together. but an estimate cant be given until its determined if the crank,rods and block are servicable. if you intend to try this yourself keepus posted and Illl try to watch for ya. I may have some of the needed parts about.<br />sounds like they gave an estimate of a power head from a reman shop. I may be able to steer ya to a dealership that can do ya good<br /> on yam parts.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Thanks for the help. I've been studying the manual for three days now. I'm picking the boat up tomorrow and hope to start checking it out. I'll find an oil pump kit so I'll have it ready. If you know a good machine shop in the Charlotte area (I'm in Fort Mill, SC), I'll get it to them once it's ready and we'll go from there. Do they sell the pins and bearings in a kit or will I need to piece it together? Guess it would be too much to ask to be able to buy a rebuild kit with gaskets, etc. Again, thanks for the help. And I just forgot how to spell Harly.

 

[rodbolt]

Re: Yam150 Submerged, then running, now problem

cool <br /> dont buy anything yet.<br /> Idont know any place in your area. however UPS delivers and I send blocks to Rons marine in portsmouth VA all the time. he is good.<br /> pistons with pins and rings are avalible aftermarket. so are some of the bearings. the gaskets I reccomend from yamaha. as well as the carb kits fuel pumps and water pump kit. replace the t-stats and pressure valve grommet as well. but the first order is to remove and dissasemble the powerhead. while its off remove the shift rod and inspect it. they were prone to rust. bill at B&T marine in Moyock NC is a good source of parts. but lets find out what ya need first.

 

[Ray Neudecker]

Re: Yam150 Submerged, then running, now problem

I would reccomend Vertex or Pro Marine pistons for the combination of price and quality. I would not reccomend the Wiescos or siezcos as they are better known. The above are high quality cast pistons and will not require the extra clearance needed for the Wiescos which brings on much faster wear. There have many problems reported on the other boards and experienced by myself before the others became available. A powerhead gasket kit is available from Yamaha and higher quality than the aftermarket sets which cost as much or more than the factory ones. get it apart first and then let us know what you need.

 

[rodbolt]

Re: Yam150 Submerged, then running, now problem

my experience with wiesco on yamaha is not good. less than stellar. they seem towork in OMC stuff but not real well in the yamaha stuff. but get it apart and have a look see. I have not used the pro-marine stuff myself but a friend of mine has had good sucess with them.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Sounds good to me guys. What's your opinion if I only have one cylinder scarred? Bore one or bore them all? From what I've read, there's not any horsepower advantage, but buying one piston as opposed to six is a cost advantage. I'd just rather do this right instead of twice.

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

Well, I just picked up the boat. I was a bit ill with the fellas because it was pouring rain and my head was lying on the trailer, the bolts were in a bucket of water which they finally found and they charged me $60 for diagnostics. I didn't have any problem with the $60, I just would have thought they would have enough sense to at least bolt up the head to keep any foriegn matter out of the cylinders. Guess that would have taken too long. Anyway, after a quick look at the cylinders, which it was pouring rain so it was a really quick look, I could feel a bit of scarring in the middle cylinder (starboard). I couldn't hang my fingernail in it but I could feel that it wasn't smooth. The tops of the pistons had some carbon but I didn't have enough time to inspect them closer. If the rain breaks I'm going to go out and have a closer look and take a few pictures. I just hate to fool around too much in the rain since water got me where I'm at to start with. Maybe I'll need a machine shop to give me an idea of how bad it is. Any other ideas as to assessing the cylinder?

 

[mojoman]

Re: Yam150 Submerged, then running, now problem

I just took some pictures. Sorry about the file size, I tried to keep detail. They're here:<br /><br /> http://www.voodooeyewear.com/yamaha.html