So i guess I blew a cylinder in my 2005 merc 25hp.i was running back to the dock and she locked up from full speed to nada in a few seconds.i wasnt able to pull the rope at all.....mechanic says its getting like 50 psi in the lower cylinder. Water pump was working when i started it that day. Oil has always been mixed at 50:1. What could have caused this?i guess im screwed into parting this out....any guesses would be great! Also whats worth trying to part out or just try to sell as a whole?thanks Rob
There actually is no "cylinder head" on a 25 merc. But yes, you blowed it up. Either it overheated and you didn't notice, or it was its time and it let loose
Thanks , there really isnt any way of telling if its overheating.or is there?so i guess its only worth parting out.
I'm not a merc guy so I'm not sure but if it has sleeves it can probably be bored out and rebuilt. If its got chrome plasma cylinders it an anchor
There is a .030 piston kit you can get, I think boats.net has it. Be prepared to spend ~$800 +- on the rebuild unless you do it yourself though. I would just get a brand new powerhead off ebay: like this: http://www.ebay.com/itm/20HP-25HP-MERCURY-MARINER-POWERHEAD-CLEAN-FRESHWATER-135-LBS-COMPRESSION-/350907095335?pt=Boat_Parts_Accessories_Gear&hash=item51b3b15927&vxp=mtr That's a GREAT DEAL.
You could try these guys... http://www.precisioncycleinc.com/cylinder_boring/ As long as you tear it down yourself, they charge $75 per cylinder to bore it. Of course there'll be other costs for parts when you put it back together.
Mattyvac is that one on ebay a direct fit?that would be great if all the other parts just mount the same.is this an easy swapout?
While I can't say for sure if that block would fit or not, I can say with certainty that it is not the same as the one on my 1999 Merc 25. The guy gives the model and sn# in his listing, so you could pull up the schematics for both and compare the part #'s.
Your 99 is different than a 01-05 motor. PCI is a great company and the owner is a great guy. I would recommend them but you need to tear down the block yourself anyway. The one in the link 'should' fit. It looks exactly like the one I took off my 04 25 when I had it.
Hey matty the guy replied and said he doesnt think it will fit.is there a certain range of years that are compatabale?
You can bore those now, I have a couple machine shops doing them now. That's not a brand new power head that is a used power head. There are more than 2000-2004 years that are compatible.
