Need 90hp Merc Machined

[NathanY]

Need it mic'd and bored maybe, might just need honed, dont know. Who is that company that everyone uses?

Compression was 120,120,100 when I tore it down. Decided to go ahead and rebuild it this winter since I have a backup on my boat now.

 

[Silvertip]

Re: Need 90hp Merc Machined

If you have it torn down, what do the cylinder walls and pistons look like?

 

[NathanY]

Re: Need 90hp Merc Machined

They actually look pretty good, but I have not had it mic'd to tell actual wear.

I am doing this not because it really needed it, because it did run very good, but because I plan on putting this old motor on a brand new boat, and I dont want any problems with it.

 

[domains]

Re: Need 90hp Merc Machined

Don't forget to check ring clearance in sleeves before installing pistons ...here i just look for a boring shop or if honing just buy a 3 blade honer and even slow strokes up and down..don't get me wrong its the best way.

 

[Scaaty]

Re: Need 90hp Merc Machined

Yep, just do a 3 stone and back and forth line hone it..get a good cross hatch pattern..new stock rings (stick a ring in first and check the end gap (do know what the book calls for off hand..)

 

[domains]

Re: Need 90hp Merc Machined

Honing top to bottom is very important, you must slowly check whats going on inside as you look for even flow.