MERC PISTONS

[h2oTherapy]

I am rebulding my 1990 115 merc after an over heat last summer. After pricing out pistons from dealer at $230 a pop, I am looking at after market options. Heres the kicker, according to factory manual, I don't have to rebore all cylinders if only 1 needs it because merc pistons for this engine come weighted the same even if over sized. Any one have any idea if this is also the case if I buy after market pistons?<br /><br />PS anyone heard of carborundum cloth? The manual suggests using it to clean up connectin rod pin hole, but I can't find it anywhere. I suspect its called something else to us lay people.<br />thanks, h2o

 

[h2oTherapy]

Re: MERC PISTONS

sorry about he caps JB, read your message after writing mine, its good advise

 

[Dhadley]

Re: MERC PISTONS

Wiseco pistons can be mixed also. Boring will depend on cylinder dimensions from taper and out-of-round. Most likely a 12 year old motor that's been hot enough to stick a piston will need to be bored anyway. Once you get it apart your machine shop can measure it with a dial bore gauge and tell you what needs to be bored right away.<br /><br />Good luck!

 

[h2oTherapy]

Re: MERC PISTONS

Thanks for the advice, I ordered parts today and cantacted a local machine shop.<br />regards,<br />h20

 

[12Footer]

Re: MERC PISTONS

LOL danged shop manuals and thier greekanese!!<br />Carborundum cloth is "emery cloth",available at all parts shops,machinasts,and some hardware stores. I think you are familliar with it, but if not, it comes in sheets (like sandpaper),rolls (like adhesive tape), and some special "belts" for machine-specific applications.<br />Maybe they call it carborundum cloth in another part of the country,but down here in swampville, it's emmory cloth.

 

[h2oTherapy]

Re: MERC PISTONS

12ftr, congrags on the 2k posts, sounds like you've been a big help to many. I am new to this board, but have already learned a lot reading through the different posts.<br />I kind of thought it was emery cloth (we call it that too here in da nort' woods), but the manual made a distinction between the two. Can't for the life of me figure it out. Maybe merc is just trying to mess with my head... not that that is any great feat.