1985 Evinrude 150 XP Project

[schroed]

Hello all,

I am new to the whole forum thing, so if I post in the wrong section or something please don't shoot me.
I have been reading up on a lot of the posts on here and have gotten a ton of great info from you guys here. Hopefully you guys can help me out here...I recently acquired a 1985 Evinrude 150XP Model E150STLCOS and I made an attempt to rotate the flywheel and it moves about an inch. I removed the heads and the bottom pistons on each bank (not sure the numbers off hand, maybe 5, 6) seemed to be what was sticking. They are both very corroded. The cylinder head is also very pitted and looks welded from an overheat condition. The boat has been stored for about 8 years give or take, without being ran. Is this most likely from water entering during storage or something else. I think I will shoot some penetrating oil on the pistons and see if that frees things up any. According to my father, whose boat it was, the motor never out and out quit. It just seemed to have lost power and idled rough. i.e. may have been running on only 4 good cylinders. Well, that is more than enough rambling for now. Thanks for taking the time to read.

 

[tashasdaddy]

Re: 1985 Evinrude 150 XP Project

probably blown head gaskets, it's time for a rebuild.

 

[rndn]

Re: 1985 Evinrude 150 XP Project

Welcome to the forum!!

 

[emdsapmgr]

Re: 1985 Evinrude 150 XP Project

Have you pulled the front of the case off to see what the crank and rods look like? The pits on the head are from pieces of the rings that have broken off and have wedged between the top of the piston and the head. Carbon around the rings is a common cause of failure on the crossflows. Insufficient lubrication to the rings results in cracked rings. Pistons can actually expand from the heat such that they lock up in the cylinder from the overheat.

 

[schroed]

Re: 1985 Evinrude 150 XP Project

Thanks for the replies. I have not gotten the chance to check the crank and rods yet. I will post back when I figure this out. I am just learning this stuff now. Thanks again to all for the responses. Also, I was curious about what needs to be changed out on a boat that has sat for 8 years. Water pump, rebuild carbs, gear case oil, rebuild fuel pump, drain fuel...just not sure. Thanks

 

[schroed]

Re: 1985 Evinrude 150 XP Project

UPDATE!! I just checked to see if I could get the flywheel to rotate after letting some WD-40 soak on 'em and sure enough they both move freely now. So, I guess next step is removing everything off of the powerhead and getting it out so I can change out the bad pistons?

 

[ezeke]

Re: 1985 Evinrude 150 XP Project

No, the very next thing you need to do is get a factory service manual so you have a guide for this whole process. You will be removing and tearing down the whole engine.

 

[schroed]

Re: 1985 Evinrude 150 XP Project

Right! I have a Seloc manual though. Should I get the factory one still since it is probably specific to the engine?

 

[Benny1963]

Re: 1985 Evinrude 150 XP Project

buy a factory manual take lots of pictures .tag everything as best as you can you may need the red wrench to teardown [torch] keep everything organized , im doing a 150 v6 1983 now there are lots of critical tolerances .
good luck
Bennyb

 

[schroed]

Re: 1985 Evinrude 150 XP Project

Just a couple of pics of the #5 Piston and the Head Cover.

 

[Mike2076]

Re: 1985 Evinrude 150 XP Project

hello,be sure you check your sleves for cracks.i am rebuilding my 86 xp150 and found a hair line crack in the #6 cylinder.i found a place to get the parts pretty cheap its(marine partsfinder.com) it a lot cheaper than a dealer.if you have some pics of your powerhead before you took it apart would help me out alot.the fello i got the boat from had the motor about apart and i havent found any good pics on how all the wires and hoses run.good luck on your rebuild. Mike

 

[schroed]

Re: 1985 Evinrude 150 XP Project

It has been forever since I have logged in here...Mike, I do have a ton of pictures before, during, and after teardown. If it is easier I can send them to your email or post here. I am getting started back into the process again. I got deployed so, I put it on hold for a lil while. Sorry, if this came too late.

 

[86 century]

Re: 1985 Evinrude 150 XP Project

Glad to have you back. Thank you for your service. I have '77 200rude that is in same shape so i will be watching.

 

[emdsapmgr]

Re: 1985 Evinrude 150 XP Project

Where was this thread for the past year? Is it being resurrected?

 

[schroed]

Re: 1985 Evinrude 150 XP Project

Yes indeed, it has been resurrected. Sorry for the absence...military life can do that some times Glad to be back and looking forward to getting dirty on outboards engines for awhile instead of jet engines.

 

[emdsapmgr]

Re: 1985 Evinrude 150 XP Project

The pic of the piston and head indicates that the cylinder ate a ring. You'll be looking at a new piston for sure and I would also replace the head, as bits of ring can get stuck in the head, to loosen up later after an overhaul. Check the cyl walls on that cyl closely for any damage and all cyls for wear taper before you decide to overbore. Always nice to know why the failure occurred before you overhaul and reassemble. I'd do an autopsy on the carb that feeds that cylinder and find if there is any debris blocking any of the fuel passages, (engine may have run lean) leading up to the failure. Also check for carbon around the piston rings. Carbon accumlation around the ringsets causes heat and is a common crossflow problem which also leads to ring failures. Good luck on your project.