Re: Remove lower unit Yamaha 9.9 long shaft trouble
Hello
I am also having the same problem with my 1988 Yamaha 8HP. I can't get the lower unit to drop out. It falls down about an 1/8" but that's it. I removed 4 bolts as well as the gear shift mechanism (basically pulled out the rod that lifts the gears and connects to the gear switch) and I left it in neutral. I've never worked on a boat engine before or any engine for that matter so I'm not sure what you mean when you say tower housing.
The reason why I am taking off the lower unit is because my engine keeps seizing up. It worked perfect for a couple of months and then 1 painted it one day. A few days later I went to run it and I heard a little squeak as it started up (only briefly though). IT appear to run fine. The next time I tried starting it up (maybe a week later), I couldn't budge the rip chord. Something was seized. I removed the plugs and cranked on the fly wheel with my socket wrench very hard and I managed to get the fly wheel to turn. IT was was very hard at first but then got easier. I was now able to start the engine up with the rip chord. IT started up on maybe a 1/2 pull (the engine is awesome) and it ran ok. It sounded like it wanted to stall at low idle though. one week later, it was completely seized again and I went through the same steps above. This happened 4 times in a row now. I talked to a lot of people and some people say water much be getting into the cylinder and rusting. I tried looking into the plug hold and I might have seen I a little rust but I'm not sure what to look for. Another person told me that the gears or components below the powerhead are probably rusted and keep seizing, which is why I am trying to remove the lower unit. The gear oil seemed fine and I changed it. However, some hard lube-like substance along with some fine particles (metal flakes, paint or sand) seeped out of the that 1/8 opened I made (just a tiny amount came out). Anywho, I really want to get this fixed and there doesn't seem to be any boat mechanic around here that wants to help me (I called 3). If anyone has any idea on what might be the issue, Please let me know. Oh, I should mentioned that there is a seal between the bottom of the powerhead and engine cover and the seal seems to be large and it's definitely not sealing anything. Maybe water got into the gears through there.
any thoughts? I have a million pictues if interested.
thank you much in advance,
Rich
