'93 60hp Rebuild Questions

[HybridMX6]

I posted some of this info in another thread, but no one is responding to it, so I'm not sure how much activity it's getting. Mainly, I've got the powerhead broken down 100%, so I need to know which parts I need to take to a machine shop for checking/work. I know my top cylinder is bad, needs to be bored and piston/rings replaced. The other 2 I will have to wait and see what the shop says, if they are ok I will just replace the rings (bearings and all too, just not the piston). Do I also need to take the crank in, as well as rods, and crank case cover? I am planning on trying to find a shop tomorrow, so I'll need to know what I need to take with me.
My other question is regarding the rod cap bolts. When I unscrewed them, there was something that appeared to be black plastic in the hole with the bolts, but it was so degraded it fell apart. My question is what is it, and is it supposed to be in there? I am thinking it is, and it would have been on the bolts where there are no threads. Thinking it is supposed to be like a shim for that part of the bolt, to keep it from wobbling, but I don't know. For all I know it could just have been some seriously built up crud. I know someone has worked on this engine before, the bottom 2 pistons don't match the top one. See my other post about those and the pics, if you don't mind. I'm curious is someone could inform me what brand they are, if it's possible. The top one was pretty bad off, there are some pics of it in the other thread as well.
Any help/insight would be great.

 

[JB]

Re: '93 60hp Rebuild Questions

It would have been far better to add this information in the form of a reply to your other thread, MX6. That would have brought it to the top. Few, if any, are going to go looking for it to get the rest of the story.

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

I already did that yesterday, but no one replied to my questions, and I need to try to find out tonight before I head to work in the morning. If all else fails, I'll just take it all with me, it's just a lot of parts to throw in the front seat of an F150 when I'm heading to work. I do deliveries for work, so my room is a bit short at times.

 

[wlbolerdo]

Re: '93 60hp Rebuild Questions

I have a '92 70 horse that I recently rebuilt. I bought a Clymer manuel which also covers your motor. When you put the rod caps and screws back onto the piston rod you will use only oil on the screws. There are no spacers in that motor. The manuel has all the torque specs and all the tolerances for you not to have to drag everything to the shop.
I bored my cylinders to .035 over, brought the new pistons and the block to the shop which they did in a day. They charged me $45.00 per hole. The intake was off, exhaust cover was off, head was off, I brought them a stripped block!
If you can see cross hatching in the cylinder as opposed to scoring than that cylinder is probably ok.
Once again, if you wish to take the motor, in pieces, to a machine shop then you'll need to know tolerances for them to compare to.
Hope this helped and oh yeah, have fun!
Wayne

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

So I'm guessing the black stuff was just built up sludge? Wow.
I have the block torn down 100%. Someone's been in this thing before. I am planning on using a marine machine shop, so they should already know my tolerances, but if not I'll take the factory manual with me, ya never know. Did you have them assemble anything or just check the clearances and bore/hone, or neither?

 

[wlbolerdo]

Re: '93 60hp Rebuild Questions

I had them bore out the cylinders only. I checked alot of stuff myself. For example, the head itself can be laid on a piece of glass and should not rock. If it does you would use a feeler gauge to measure the gap and if it is in the range that's givin your all good. Just torque it down.
Wayne

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

My head seems to have a lot pf pitting where the water jacket is. If the head is still level, will that be a problem? I just spent 30mins with a scraper removing all the old gasket and oxidation I could.

 

[wlbolerdo]

Re: '93 60hp Rebuild Questions

Mine had some pitting. I wasn't to concerned about it because you'll be using a gasket sealing compound on both sides of the gasket. If you have any doubts bring the head to your local marine mechanic and get their advice. The head can be planed.
Get yourself a can or two of gasket remover. It's available at auto parts stores and it works.
Wayne

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

Thanks for the advice, I appreciate it. I'll take it with me tomorrow just to see if they can give it a quick once over, since I'm there anyways. It's not really down the street, so it's not convenient enough to just do it another day.

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

Ok, well, I swung through an outboard repair shop today that I pass off and on for work, and got his recommendation for where he sends his stuff to. Thankfully, it was like 4 blocks away, so off I went. They do both marine and automotive machining, so hopefully they do decent work. Cost is as follows:
Boring 1st cylinder $35 every additional cylinder $30
Honing cylinders $22
Removing broken bolt in motor $20 without helicoil, $25 with it if it pulls the threads out.
My top cylinder definately needs boring, so that's $35. The bottom 2 he said he thinks he can just hone since they weren't bad at all, so if that's the case, $44 more for those 2. Also removing one bolt, $20 (maybe $25). Grand total at this point $99 + tax (+/- $5 if helicoil is needed). Not too bad. Hoping the bottom 2 are good enough for honing only so I will only need rings instead of pistons too.
I'll have to let ya'll know how it comes out, and my actual total if something comes up too worn out.

 

[Dhadley]

Re: '93 60hp Rebuild Questions

WL, where did you find a .035" over piston for that motor?

 

[wlbolerdo]

Re: '93 60hp Rebuild Questions

Dhadley,
The new pistons are .030 over sized from Evinrude not standard. Sorry for any confusion. I pretty much remember being told back in July that the only other piston was a .035 or that was the next biggest before resleeving, I can't remember that far back. I ordered the OS pistons, brought them to the shop and they bored the cylinders.
I take it that a OS piston is not a .035 piston?
Wayne

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

I've only seen standard or .030 for mine from BRP, nothing in between. Wiseco has .020, .030, and a .040 I believe.

 

[Dhadley]

Re: '93 60hp Rebuild Questions

That is correct Hybrid.

I'd be leary about a machine shop that needs the pistons before they bore.

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

That is correct Hybrid.

I'd be leary about a machine shop that needs the pistons before they bore.

They wanted to see the one that was torn up to see if it was already an oversize piston or not, since I told them it had been worked on before this, they wanted to check. He just looked at it, then gave it back to me. He didn't look at the other 2, just felt the cylinder walls and gave them a looking over.

 

[Dhadley]

Re: '93 60hp Rebuild Questions

No need to look at a torn up piston to tell if a cylinder has been bored. He'll know that as soon as he sets up for the machining.

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

I dunno, maybe he was looking to see if he could bore it or if it had already been bored where-as I may need to sleeve it so I could get a price.
I won't know until next Tuesday at this point.

 

[SKEETR]

Re: '93 60hp Rebuild Questions

My macinist wanted the new pistons, not the old ones. If he is measuring tolerances you might need to provide the exact measurment yourself from your repair manual.

 

[HybridMX6]

Re: '93 60hp Rebuild Questions

This guy said he had the books for all the #'s, he just needed to know my year and hp, which I of course gave him. I trust them enough since the guy that referred me to them has been in business for a while, and that's who he uses. If he did crappy work he wouldn't be there any more.

 

[SKEETR]

Re: '93 60hp Rebuild Questions

Make sure they bevel the edges of the ports as well. They shouldn't feel sharp to the touch.