850 & 1075 Maintenance
 

We are concidering upgrading to a boat with 850's or 1075's. What is an average amount of hours on each before a rebuilt. We do run full out sometimes but spend most of the time in the 70-75mph range which I assume would be 0 boost on these engines? Also How much are the rebuilds?

From what I have heard and read here on OSO, those motors are EXPENSIVE to rebuild.

$25k or so per 1075 if nothing's broken. 100+ hours or so before it's needed according to Mercury.

http://www.mercuryracing.com/_media/...1075_Maint.pdf

I read somewhere that the 1075 should be torn down, inspected, new seals, bearings, etc, every 25 hours. I think the cost was something like 23k.

If your loaded then the cost to purchase and rebuild these High HP engines makes no difference to you. But on the other hand if your the average boater with an average income you want reliability and low maintenance cost, stick to the lower HP motors and enjoy the boating season. I think the cost are getting rediciolus.

dont think so

I think it may have been a racing team or something that was doing it every 25 hours.

Most of the failures that I have heard of were at about 125hrs, with lifter failure. Also a couple of timing belts.
I think if you do the topend by 100 hrs, 200 before a total rebuild it reasonable.
Yes the Merc rebuilds are $$, approx $23K each for the total rebuild. But if you are the original buyer you get 25% off.

Not exactly.
They recommend that the valve lash should be checked and adjusted if needed every 25 hours.

Do they have the larger Dia lifters ?

What do you concider loaded?

Im usually loaded after 16 beers:D

Ill keep my 700's...just add another for more speed...in my next boat:D

$250,000.00 and up per year.

So what about Sterlings? What would be something besides mercury that would make good hp and be realiable? The last boat had 525s and they did not impress me(thanks to CMI). Next boat I want will be smaller and only have 2 engines. I want a 38-42 v-hull that will do 125-135. What would everyone say would be the most reliable motor that runs on 91 octane that will not have to be rebuilt like these mercurys being discussed? Or am I just dreaming about a reliable big hp motor?

If you can buy 1075's and # 6's or surface drives and pay for the fuel those bad boy's eat - you can afford the maint. IMO. :cool-smiley-011:

Gotta ask - what boat do you want to put them in??? Can't be a 382 (one of my personal favorites). Come on, let's hear about the new toy they will be in! :D

Behave Jass! I can't afford to buy your current boat yet! :D :D

Trust me, no one making 250K a year is buying a new 850/1075 boat nevermind maintaining one. I would venture to say you need to be banging down in excess of 750K to be able to comfortably enjoy a 850/1075 boat with annual 50K rebuilds. Even at 750K you won't be banking any money assuming the lifestyles that go with a big dollar rides (cars, houses, spending). A guy with a 47 OL GTX 1075 boat won't live in a 2K sq foot ranch and drive to the marina in a pick up! :D

dreaming.................... a 700 boat will tag 100 in a 38-42 but you will need a 1075 plus to get 125+++. Go see Potter engineering in Sarasota, his power screams in Nortechs.

Looking at gettin rid of the 382 for a Cig 39. Want to run with the big boys now. No way 250k can afford a boat with 850's or 1075's. I would think you would need a lot more than that

You will need a cat to run those speeds or a Fountain with 1075s. Even the Cig 39 with 1075s runs between 120 and 125 I believe

I'm certainly not the expert, but anything more than 850's in the 39' does not seem piratical. Go for the Tiger, etc. IMO.

I almost bought a Cat w/ 800 SC's last year. Believe it or not, the fuel is what put me off. I would run the same kind of speeds as you mentioned, so, no boost for me. I was looking for 250 hrs. before rebuilds if that was even piratical.

Either way, looking forward to seeing your next toy! :D

I thought I read that the skater 39v did 130ish with 1075s. The cat insurance in Florida is just about impossible, so I will probably stay away from cats. The new quad step Donzi 38 comp should do those speeds, it did 115ish with 700s.

Sarasota is just around the corner from me. Is that who builds the Nortech motors?

I'm very close to Nortech's factory, unless I'm mistaken, they are built around here also.

Yea Im thinking the 700's 39 would be a sweet boat. I know my 600s are rated at 56gph at WOT, what are the 700s, 850s and 1075s rated at fuel wise?

Excuse my very obvious ignorance, but, is that PER motor......?

God I hope not.

yes....

All Mercury engines have .842 diameter lifters

It is interesting that Mercury doesn't use the .937 Jesel solid roller lifter system that the Bush and Truck teams all run. If the Jesel lifters could get you another 25 hrs out of the larger dia/wheel lifter Jesel package, the extra $2,000 an engine would be cost effective...cheap?

We were told that the 850's in the Nortech would need to have the valves adjusted, and the pulleys replaced every 25-35 hrs. Hell the idler on that thing is over $800 my cost. You can replace the bearings in the idlers - and save quiet a bit of $$.

Has anyone else heard this - I know the valves have to be done - that's given on a solid lift motor - but what's the deal with the pulleys?? Only 25 - 35 hrs? I can see all hell breaking loose should one fail and sling a belt at 5600 - and it's better to be safe than sorry.... So would you just do the bearings? Or complete pulleys? The motors were just freshened up last year at Nortech.

We did a factory tour at Nor-Tech in Ft Myers and they were telling us 150hrs on the 850s is what is typically seen but thats a little high compared to what i have read on here

There should be some inbetween style lifters that should be better that the .842 merc's.Unless merc already uses a higher quality?What about the dia of the cam?

??
Crane Ultra-Pro Series roller lifters

Crower .904 Cut-Away Hippo lifters


There saying Darin Morgan uses these lifters.
http://www.lsmeng.com/Lifters.html

The .904 lifters, 680 street roller cam, and top of the line isky springs will run forever. And if you want more power, just run an efficeint blower and turn the boost up.

:ernaehrung004:

Jay! As soon as we get a new boat you will have to come with us on a fun run if you would like. We would offer on the Formula but it tends to be unreliable at times and would hate to have it break down on a fun run or even go into alarm, which it seems to do every 5 minutes

We were told that the 850's in the Nortech would need to have the valves adjusted, and the pulleys replaced every 25-35 hrs. Hell the idler on that thing is over $800 my cost. You can replace the bearings in the idlers - and save quiet a bit of $$.

Mercury 850's??

That is so true.

Buy a 39 Nortech with their 650's run about 100mph on 89 oct. gas, run 2 seasons before rebuilds. The boat feels bigger than the Cig and a little faster but you can't go wrong with either Just my 2cents.

the other boat we are also concidering is a Nor-Tech 39 with Merc 700's