3.0L merc efi
 

i started my 23cc project. nothing special yet just taking out the wireing and stripping the console. ill have porn of that when i get started on the console. i bought this boat knowing the motor had a bad hole in it. well it was killing me to not know what it looked like in there so i took the head off last night.
what i want to know is, is it cost effective to rebuild a 3.0? whats the best way to do it? bore out all cylinders and put oversize pistons? (im leaning towards that.) i think this motor had an oil injection problem because all the cylinders have a problem. anyone who has taken this on please give me your opinion. im not afraid of rebuilding it and ive got the tools to do it.


this is the hole with 0 psi:
http://i62.photobucket.com/albums/h1...0/IMG_1098.jpg http://i62.photobucket.com/albums/h1...0/IMG_1099.jpg http://i62.photobucket.com/albums/h1...0/IMG_1100.jpg http://i62.photobucket.com/albums/h1...0/IMG_1101.jpg http://i62.photobucket.com/albums/h1...0/IMG_1102.jpg

the rest of the holes have about 100 psi and look like this:
http://i62.photobucket.com/albums/h1...0/IMG_1103.jpg http://i62.photobucket.com/albums/h1...0/IMG_1105.jpg http://i62.photobucket.com/albums/h1...0/IMG_1106.jpg

how much does it cost to get a block bored??
thanks for any input guys!!!

Re: 3.0L merc efi
 

240 for boring all 6 .015 over as long as that 1 will clean up OK - just have it bored before you buy pistons, the guy will do it until its good - maybe .030 maybe not. Be sure and put Chris Carson Reeds in it best 120 you could spend - tell them i sent you, great guys to work with - their in Key Largo and will answer some rebuild questions too. I put a new oil pump and gear in just because of hours but thats optional about 250. The rest on the mains and seals are all minimal and you can get everything from Pro Marine and shipped to you via Mike@American Marine. I have a whole parts list with prices for a 2.5 but should be close, or go to Pro Marine on the net - those are list prices though not yours.

Re: 3.0L merc efi
 

Evan,
I have to pull my powerhead as well as it seems the base gasket failed. Salt is hell and that area doesn`t get flushed.

What worries me is 0 compression. This means the piston is not moving. Maybe the rod broke into more than 3 pieces. Maybe not.

Machine cost is determined by what is found, and your goals.

Cheers,
GFS

Re: 3.0L merc efi
 

240 for all 6 is alot better than i was thinking. i was fearing 100 per hole. a set of pistons on promarines website was 700 with rings. so im thinking a little over 1200 to rebuild? what do you think about putting all new bearings in it? i probably should since im in there right?

Re: 3.0L merc efi
 

the pistons moves sandy. i turned the flywheel to see all the cylinders and to check that the piston moves :)

Re: 3.0L merc efi
 

If your piston is moving why are you getting 0 comp?

Re: 3.0L merc efi
 

im guessing because the cylinder wall is scored so badly. you cant see in the pics but that piston is destroyed. it seems to have a flat spot on it. thats why i think it was an oil injection failure. plus i know the previous owner started it with no water. i dont know how long he ran it for or anything.

Re: 3.0L merc efi
 

Hone one or do em all over? :D

Re: 3.0L merc efi
 

Even if it is scored badly you would see some compression.

Re: 3.0L merc efi
 

i dont see any hole in the block. when i said "hole" i meant the cylinder. im hoping it just needs to be bored over and have new pistons and rings.

Re: 3.0L merc efi
 

im going to talk to a mech tomorrow about it. im hoping that i can pay him for some of his time and he will help me put it back together. he loves merc and has a shop full of tower of powers.

Re: 3.0L merc efi
 

Evan,
It seems very strange to me that a piston can go thru a cycle and not put say 30 or 20 on a dial. If it`s the no 1 maybe a crank shear? Not trying to be doom n gloom here.

Re: 3.0L merc efi
 

i know. maybe i need to inspect the head a little better. maybe head gasket is destroyed? im still hoping nothing serious because all the pistons move.

Re: 3.0L merc efi
 

Ok that was a dumb thought. If all the slugs are moving how do you get no comp. #?

Re: 3.0L merc efi
 

I feel the comp # should register if you have any crank # if not sheared.
I`ll be pulling my PH next week and let you know how things go. I love twisting and learning.

Cheers and let me know if I can help,
GFS

Re: 3.0L merc efi
 

Even with no rings you would still get something on the dial. I paid $300 / $50 per hole 4 years ago. Went 20 over. I put about $2000 in it including bearings.

Re: 3.0L merc efi
 

I take that back. I did a little experiment. It takes 30 psi to open the valve stem in my compression gauge. You probably have compression just not enough to open the valve stem on your gauge.

Re: 3.0L merc efi
 

what did you put in it for 2k? i want to try to reuse the crank and rods probably. just pistons bearings ans=d gaskets and those reeds esd was talking about and remove oil injection.

Re: 3.0L merc efi
 

Machine work, pistons/wrist pins , rings, bearings, gasket/seal kit including gear case and a decal kit ($150). Crank was good. I also had another couple hundred bucks in tool purchases on top of that $2000.

Re: 3.0L merc efi
 

well i just got back from talking to the mech. i trust this guy and i like his work but he said it would be between $3500-$4000 to rebuild it with a warranty for 1 year. i think ill save some money and do it myself.

i also called chris carson marine by ESD reccomendation and they seem to be the way to go right now. $3200 with 1 year full warranty and 2nd year half and half. they will give it 15 more hp with a turn around of 1 week. he said im lookin at about 2K just in parts. doesnt seem like a bad deal to me.

Re: 3.0L merc efi
 

Is Custom Machine Shop still down there? I'm pretty sure at some point in time they did all of Sea Tows work.

Re: 3.0L merc efi
 

Those guys are the bomb down there - on the parts - pistons come with rings - you need all upper rod bearings and should do both mains (30 ea) possibly 1 rod about 100 - I did not do the crank/rod bearings but their 30ea. Seals are minimal and the gasket set complete in like 170. Anything on Pro's site deduct like 20%. I did an oil pump and gear which sounds like you need that too - 195 pump 65 gear. You also need the CCMS reeds which are 120.

So yes that is a pretty good deal by the time you start adding up the parts

I would consider having those guys do it, I think they are very good in general and you do get the warrenty. They are very well thought of as a supporting vendor at Scream & Fly which is where I heard of them. Another bonus is you can go have a beer with Skip on any trips down - they are right there.

There is a dyno reed test being done over there at S & F, Chris;s reeds are 1 being done but Tony Brucato one of the premier HP fuel and electronics suppliers said he got more RPM over a longer period than with Boysens, another guy said he got 150/200 more RPM. Quite a few brands but seems everybody expects CCMS to be the top dog, quite interesting some of the comments on reeds. CCMS does all brands by the way - they are not steel like stock so they don't destroy a motor if they go through - mine idled much better (expected) but seemed much quieter as well? I have decided this is mandatory on a rebuild.

Re: 3.0L merc efi
 

It was nice meeting you yesterday and showing me your 23.
It will be a nice project but when done it will be real nice. It is so much bigger than my 20..what a difference!

Good luck and lets keep in touch I am looing forward to seeing some progress

Re: 3.0L merc efi
 

i definetly waNT to keep in touch. ill be putting up pics soon as im going to put the console in my garage and start working on it. i sold the top today too. only took 4 days. :)

Re: 3.0L merc efi
 

Hey Blue send me your number - got some info for ya or call me 813 286 8344

My motors back by the way with a nice weekend on tap

Re: 3.0L merc efi
 

What did you decide, I did talk to chris and his comment was that warrenty Carson offers is hard to beat ????

Re: 3.0L merc efi
 

yes i did talk to him for about 20 minutes. he said that he cant touch that warranty of 1 year full warranty and another year of half and half. his warranty was 90 days. he told me that he will build it for about $1000 less. 4 hours away vs 45 minutes away is another factor.

Re: 3.0L merc efi
 

You can believe him on his warrenty, when mine blew he did everything - I did give him 200 just because but that was 2 sleaves - 2 pistons - boring those 2- taking all the other rods to pro Marine and Magnafluxing and taking it apart and back together, I felt bad but he stood behind it.
His comment was you just can't trust somebody no to do something stupid that long - but warrenty is definately a value if its worth anything. I would ask some questions about part failures and the like to be sure what kicks it in but they sound pretty honest down there but that can change quick.

I will be out this weekend I think it will be nice and will post up some numbers as i will be able to WOT - the Stilletto appears to work really really well but I'll go over the differences in my post.