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Max Online: 36273 @ 01/23/13 02:34 PM
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#11316764 - 01/01/16 05:10 PM Merc ProXs problem
BoneDiamond Offline
Outdoorsman

Registered: 08/15/13
Posts: 56
Today I ran my boat about 1 mile from the ramp and lost rpm so I shut down and motor was shaking violently then died. I trolled back to ramp and saw metal( looked like cast aluminum) in the exhaust port by prop. Gear shift wouldn't go into forward until I too the prop off to look at lower unit oil. ( which was ok). Any ideas on where to start as far as a diagnosis would be helpful.

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#11316890 - 01/01/16 06:09 PM Re: Merc ProXs problem [Re: BoneDiamond]
JimmyP Offline
Pro Angler

Registered: 11/26/12
Posts: 806
Loc: Waxahachie, Texas
Pull the plugs and look for melted aluminuim spots on them. Sounds like a piston let loose but I hope it's something else.

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#11317058 - 01/01/16 07:35 PM Re: Merc ProXs problem [Re: BoneDiamond]
Gamblinman Online   content
Extreme Angler

Registered: 11/26/02
Posts: 2940
Loc: Yantis, TX
Hate to hear this...look into cold seize.
_________________________
Texas Crappie Posse

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#11317561 - 01/01/16 11:37 PM Re: Merc ProXs problem [Re: BoneDiamond]
LOSTTEXAN Offline
Outdoorsman

Registered: 05/10/09
Posts: 47
Loc: Pensacola, Fl
I'm afraid this might not end well.
As mentioned, pull the plugs, activate the kill switch and see if it will crank, and if so what it sounds like.
With the plugs out you should be able bump the starter incrementally until you can see each piston top with a flashlight.
_________________________
Grew up on Tawakoni and Texoma before hybrids and stripers existed on either.

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#11318157 - 01/02/16 11:52 AM Re: Merc ProXs problem [Re: BoneDiamond]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 11205
Loc: Littlefield Tx & Lake A. H. US...
Drop the lower unit off first. See if it runs alright then. It will not hurt it to run for a few seconds just to check. If motor still sounds bad you have powerhead problems. How long did you let the motor warm up before you took off?
_________________________
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD

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#11318366 - 01/02/16 02:59 PM Re: Merc ProXs problem [Re: BoneDiamond]
BoneDiamond Offline
Outdoorsman

Registered: 08/15/13
Posts: 56
Just got home to tools to do some checking. Motor ran for several minutes before I ran. Outside temp was upper fortys water temp 55.

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#11318920 - 01/02/16 07:57 PM Re: Merc ProXs problem [Re: BoneDiamond]
Bruce's Guide Service Online   content
TFF Team Angler

Registered: 09/04/03
Posts: 4064
Loc: southlake
I say lower unit as mentioned above.
_________________________
Bruce's Sprinkler Repair
817-798-7246
47 years experience
State Licensed Irrigation
LI0017483


Fishing Texas lakes one at a time







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#11323184 - 01/04/16 08:02 PM Re: Merc ProXs problem [Re: BoneDiamond]
BoneDiamond Offline
Outdoorsman

Registered: 08/15/13
Posts: 56
I pulled the plugs. The #6 plug was damaged and had melted metal on it. So I guess I dropped a piston. What are y'alls suggestions going forward?

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#11323807 - 01/05/16 05:45 AM Re: Merc ProXs problem [Re: BoneDiamond]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2236
Loc: ft worth
not good news, sorry man... even if you're able ta diy its gonna be expensive when its fixed tha right way!

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#11323835 - 01/05/16 06:35 AM Re: Merc ProXs problem [Re: BoneDiamond]
Bruce's Guide Service Online   content
TFF Team Angler

Registered: 09/04/03
Posts: 4064
Loc: southlake
Take the engine to a reputable engine builder that will give you a warranty. The cost to rebuild is going to run close to 4000. Thats a lot of coin to spend on the motor and not have at least a year warranty. Or you could talk to Mercury about a remann.

I am in the process of rigging a new Pro xs 250
_________________________
Bruce's Sprinkler Repair
817-798-7246
47 years experience
State Licensed Irrigation
LI0017483


Fishing Texas lakes one at a time







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#11362116 - 01/21/16 08:48 PM Re: Merc ProXs problem [Re: BoneDiamond]
OPTI Offline
Extreme Angler

Registered: 06/23/04
Posts: 1428
Loc: Benbrook Tex
Sounds like it cold seized those 3 litres are famous for that this time of year. Piston swells faster than the block because of trash in the thermostats,gets # 6 everytime.

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#11376359 - 01/28/16 09:55 AM Re: Merc ProXs problem [Re: BoneDiamond]
boatman025 Offline
Angler

Registered: 07/16/10
Posts: 494
Loc: McKinney
where you located I'm in McKinney I can rebuild motor you I have a shop
_________________________
Hughes Marine Service
McKinney ,Texas

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#11380181 - 01/29/16 09:46 PM Re: Merc ProXs problem [Re: BoneDiamond]
WillV Offline
Outdoorsman

Registered: 01/26/10
Posts: 83
Sounds like a similar situation I've heard about with a 200 Merc. Different model, but long story short reed valve chipped off and got sucked into the piston and made a terrible rattling noise. This was a mid 80's 200 black max engine but the reed valves are paper thin and once they develop cracks it's easy for them to get sucked into the engine when the piston comes off and explosion.

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