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Bad boat motor

Post By: slimmy      Posted: 5/15/2019 3:21:33 PM     Points: 3    
I recently got news that my 2002 mercury 150 EFI has bad compression on 3 of the cylinders so basically its a bad motor? I'm not sure what to do because the mechanic said its not worth to rebuild. Any suggestions on how to trade-in the old motor or sell it. The boat is in great condition so I'm kind of stuck on what to do.
 Reply by: Hawaiian Punch      Posted: 5/15/2019 3:28:38 PM     Points: 8498    
Get a second opion.
I use Pat at Vintage Outboard in Arvada,he is fair and knows his way around boat motors.
You must make an appointment and he only answers the phone from 8am till 8.30 am.
5745 Tabor st.
Arvada 80002-1403
I would not throw in the towel just yet . . . .Pat may have a source for a new power head or know a good way to fix your old motor.
BTW . ./ .please let us know how this turn's out.
 Reply by: Eyefishing      Posted: 5/16/2019 10:08:31 AM     Points: 2136    
Yes do get a second opinion for sure or you can do a compression test your self very easy. Most auto parts have the testing gauge some places even rent it. Hope it turns out good for you.
 Reply by: Ajax5240      Posted: 5/16/2019 10:12:10 AM     Points: 31137    
Does the motor have a ton of hours on it? Did they have any idea what caused all 3 cylinders to fail? That a 2 stroke or 4 stroke?

Get it in for a 2nd look for sure. If you chose to have it rebuilt, be sure they identify what caused this failure to prevent it happening again.

I.e. the auto Oiler is clogged and ran lean... wouldn’t want that to cause the rebuild to fail..
 Reply by: Gwill      Posted: 5/16/2019 10:44:10 AM     Points: 4435    
Pat rebuilt my 75hp Mercury a few years ago and it runs like a champ now and price was very fair.
 Reply by: slimmy      Posted: 5/16/2019 3:03:38 PM     Points: 3    
Its a 2 stroke and the hours are not crazy I'm guessing. It spent most of its life on Standley lake so the runs worn't far. I took it to island lake marine and I trust the technician, he said he I shouldn't rebuild because the issue could occur again. I'll try calling some other places to get a second opinion.
 Reply by: Hawaiian Punch      Posted: 5/16/2019 5:49:21 PM     Points: 8498    
This is a "V" six motor and three cylinders are dead.Are all three cylinder on the same side? What did the compression test tell you?Was this motor used at Standly for fishing only?
 Reply by: Ajax5240      Posted: 5/16/2019 9:18:44 PM     Points: 31137    
HP, I’d bet it’s a 3cyl in-line much like my 90hp. All three holes fried.

While the oiling system may have cause it. It should be repairable too. And even if not, you’d just have to mix oil with the gas. A ratio rite beaker makes that easy.

All depends if you have the budget for a new outboard, and what quotes you can get for a rebuild. If the rebuild has a warranty, I bet they fix that oil system too.
 Reply by: Hawaiian Punch      Posted: 5/17/2019 5:25:39 AM     Points: 8498    
Ajax . . .I looked it up and it's a V 6 motor . . . .there is a good chance its rebuildable.
 Reply by: morry      Posted: 5/17/2019 6:33:07 AM     Points: 211    
I agree with using Pat at Vintage. He's honest, fairly priced and a great person.
He has rewired my 54 year old boat, tunes and repair my Johnson 70 hp and multiple other misc stuff
 Reply by: slimmy      Posted: 5/17/2019 7:07:04 AM     Points: 3    
Thanks guys I'll call Pat and see what he say's
 Reply by: Hawaiian Punch      Posted: 5/17/2019 5:42:26 PM     Points: 8498    
slimmy . . . .Pat only answers the phone between 8 and 8.30 in the morning.
 Reply by: Ryan      Posted: 5/19/2019 8:22:50 AM     Points: 2376    
If you are up in Fort Collins, take the boat up to Inlet Bay by Horsetooth. Bruce up there is far and away the best I have worked with.

I'm willing to take my boat up there for service and I live in Arvada.

Bruce isn't the easiest to get a hold of (like most boat mechanics in prime season), but he is worth the effort. 970-223-2775

I won't comment on Vintage Motors.
 Reply by: Wacokid57      Posted: 5/20/2019 1:40:41 PM     Points: 11    
sometimes low compression is due to rings stuck in the groves on the piston.....due to carbon and gunk. If you don't run it up much, it could just need a major Seafoam treatment to clear out the crap in the combustion chamber. Migtht be something to try before paying a mechanic. Look at the how to videos on their web sight..
 Reply by: kicker      Posted: 5/22/2019 6:21:34 AM     Points: 115    
This is a good motor IMO.
So what caused this to happen?
I always use Mercury products only.
Use a fuel system cleaner every season.
Use Top Tier fuel only and a minimum of 87 octane.
Fuel stabilizer every winter.

I agree run some Sea Foam or Berrryman B12 through it.

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