texasfishingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
TraeMartin, Power-Pole CS, T-Rigger, JoeGoes, EcKo
119150 Registered Users
Top Posters(All Time)
hopalong 120,565
TexDawg 119,511
Bigbob_FTW 94,879
John175☮ 85,892
Pilothawk 83,259
Bob Davis 81,478
Mark Perry 72,280
Derek 🐝 68,311
JDavis7873 67,416
Forum Statistics
Forums59
Topics1,037,815
Posts13,934,987
Members144,150
Most Online39,925
Dec 30th, 2023
Print Thread
Merc ProXs problem #11316764 01/01/16 11:10 PM
Joined: Aug 2013
Posts: 83
BoneDiamond Offline OP
Outdoorsman
OP Offline
Outdoorsman
Joined: Aug 2013
Posts: 83
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.

Re: Merc ProXs problem [Re: BoneDiamond] #11316890 01/02/16 12:09 AM
Joined: Nov 2012
Posts: 806
J
JimmyP Offline
Pro Angler
Offline
Pro Angler
J
Joined: Nov 2012
Posts: 806
Pull the plugs and look for melted aluminuim spots on them. Sounds like a piston let loose but I hope it's something else.

Re: Merc ProXs problem [Re: BoneDiamond] #11317058 01/02/16 01:35 AM
Joined: Nov 2002
Posts: 4,439
Gamblinman Offline
TFF Team Angler
Offline
TFF Team Angler
Joined: Nov 2002
Posts: 4,439
Hate to hear this...look into cold seize.

Re: Merc ProXs problem [Re: BoneDiamond] #11317561 01/02/16 05:37 AM
Joined: May 2009
Posts: 47
L
LOSTTEXAN Offline
Outdoorsman
Offline
Outdoorsman
L
Joined: May 2009
Posts: 47
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.
Re: Merc ProXs problem [Re: BoneDiamond] #11318157 01/02/16 05:52 PM
Joined: May 2003
Posts: 11,586
gary purdy Offline
TFF Guru
Offline
TFF Guru
Joined: May 2003
Posts: 11,586
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
Re: Merc ProXs problem [Re: BoneDiamond] #11318366 01/02/16 08:59 PM
Joined: Aug 2013
Posts: 83
BoneDiamond Offline OP
Outdoorsman
OP Offline
Outdoorsman
Joined: Aug 2013
Posts: 83
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.

Re: Merc ProXs problem [Re: BoneDiamond] #11318920 01/03/16 01:57 AM
Joined: Sep 2003
Posts: 5,511
Bruce's Online Sad
TFF Celebrity
Online Sad
TFF Celebrity
Joined: Sep 2003
Posts: 5,511
I say lower unit as mentioned above.


Bruce's Sprinkler Repair
817-798-7246
52 years experience
State Licensed Irrigation
LI0017483


Fishing Texas lakes one at a time






Re: Merc ProXs problem [Re: BoneDiamond] #11323184 01/05/16 02:02 AM
Joined: Aug 2013
Posts: 83
BoneDiamond Offline OP
Outdoorsman
OP Offline
Outdoorsman
Joined: Aug 2013
Posts: 83
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?

Re: Merc ProXs problem [Re: BoneDiamond] #11323807 01/05/16 11:45 AM
Joined: Nov 2006
Posts: 2,846
T
TLW Offline
Extreme Angler
Offline
Extreme Angler
T
Joined: Nov 2006
Posts: 2,846
not good news, sorry man... even if you're able ta diy its gonna be expensive when its fixed tha right way!

Re: Merc ProXs problem [Re: BoneDiamond] #11323835 01/05/16 12:35 PM
Joined: Sep 2003
Posts: 5,511
Bruce's Online Sad
TFF Celebrity
Online Sad
TFF Celebrity
Joined: Sep 2003
Posts: 5,511
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
52 years experience
State Licensed Irrigation
LI0017483


Fishing Texas lakes one at a time






Re: Merc ProXs problem [Re: BoneDiamond] #11362116 01/22/16 02:48 AM
Joined: Jun 2004
Posts: 1,509
O
OPTI Offline
Extreme Angler
Offline
Extreme Angler
O
Joined: Jun 2004
Posts: 1,509
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.

Re: Merc ProXs problem [Re: BoneDiamond] #11376359 01/28/16 03:55 PM
Joined: Jul 2010
Posts: 1,336
B
boatman025 Online Content
Extreme Angler
Online Content
Extreme Angler
B
Joined: Jul 2010
Posts: 1,336
where you located I'm in McKinney I can rebuild motor you I have a shop


Hughes Marine
3855 Osage Lane
Wylie ,Texas
Re: Merc ProXs problem [Re: BoneDiamond] #11380181 01/30/16 03:46 AM
Joined: Jan 2010
Posts: 85
W
WillV Offline
Outdoorsman
Offline
Outdoorsman
W
Joined: Jan 2010
Posts: 85
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.

Previous Thread
Index
Next Thread

© 1998-2022 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3