1986 150 yamaha water in my lower unit

sven · #1 03-22-2010, 08:46 PM

I'm trying to decide if I should replace my lower unit as I have the kaluaha milky oil situation. Motor ran fine all last season and I was thinking of just monitoring the situation. My mechanic says its not really worth re-sealing a LU this old when you can get a new after mkt one for $800 or so (he will install for $200 labor). Any guidence is appreciated. The motor runs good and I think the power-head could hopefully go a few more seasons. Should I drop the grand and get a new LU, try and re-seal the old one myself (or get someone to do it) or just run it and keep and eye on the oil.....I dont have a trailer so if I dont do it and it fails it'll cost my $$ to pull the boat and re-cider block to get it done.

nymack66 · #2 03-22-2010, 09:19 PM

Whats your location? Can't you rent Boat trailer for the day or week? Here in Orlando this is an option.
As for the cost of a LU for an 86 motor all I can say is WOW! One thousand dollars ?
I can recommend you shop ebay or craigs for a LU and replace it yourself and save a few bucks. I am guessing you can do since you mentioned you can do the re-seal, swapping the LU is much easier.
Here is an LU with a 90 day warrenty for around 700
http://cgi.ebay.com/ebaymotors/YAMAH...ssoriesQ5fGear

sven · #3 03-22-2010, 09:56 PM

Thanks. I'm getting lazy these days. Too much work during the week at my job to be fussing with the motor on my weekends I guess. I actually used to like doing work on the engine, not anymore. For 200 bucks i get it done with the water pump as well. I was just wondering if some water intrusion in the LU is acceptable. The other thing I was concerned about is re-sealing a LU thats 24 years old. Dont know what the cost is to re-seal versus replace. The quote i got for $800 for the LU, plus 200 labor didnt seem that bad. Resealing's gotta be a lot more in labor. One friend told me 500-600. So it seems logical to get a new one.

THEFERMANATOR · #4 03-22-2010, 10:27 PM

$200 to replace a lower unit is downright robbery, plain and simple. Unless the lower is frozen into the midsection and needs to be cut out, then that is a 1 hour job tops. The $800 for a lower unit isn't that bad actually since it is for a YAMAHA, but this is an 86 engine. Has the shift shaft been replaced on it yet? If not then I wouldn't dump anymore money into it as that right there can be a very costly repair. For an old engine like that I would seriously reccomend finding another outboard if your going to put $1K into what you have now. Chances are you can find a complete outboard with a blown powerhead for less than the $1K and have all kinds of spare parts. I personally would re-seal what you have yourself. If it is seized together though then it will get expensive once you need the torch and pullers to release the bullet in it. Good used lowers can normally be had for $500 or less for low time units even for a YAMAHA.

sven · #5 03-23-2010, 08:00 PM

Thanks. I'm probably gonna get the LU pressure tested to see where its leaking. If it is I may just re-seal it. I noticed the washers on the fill and vent screws look pretty shot so maybe thats the problem. When I drop the LU i will inspect the shirt rod. I'm hoping the previous owner may have replaced the shaft. If it looks shot then I may just run it till it fails on me (i fish only in Sandy hook bay in nice weather and have towboat ins) or dump it and get myself a new motor this spring before i put it in. Cash is the main factor in making that decision.... seems to always be unfortunatly.

willy · #6 03-23-2010, 10:57 PM

On a previous motor of mine the lower unit had been serviced just before I bought the boat. Being foolish I trusted the mechanics work and just checked and found the oil clean and ran the boat half the season before I checked the oil and found it was all milky looking.
I changed the oil, and replaced the washers which should be done each time and were not, ran the motor the rest of the year and each year after and no more milk.
It was the washers, also if you have a mild leaking seal somewhere there are some fluids to put in your oil which will seal the leak and they do work. I can't remember the name of it now but according to a marine mechanic it does work well unless the a=seals are just boken or rotted bad, good luck