engine kit

mowerman

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Jan 15, 2007
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5
I`m not new here, just havnt been here in a while and lost my old info so had to re-register. I have a simple question though. I spun the engine bearings in my 88 omc(gm) 4.3l. Since I had to tear it down, I am going to just rebuild it. But after a lot of confusing resaerch and conflictiong answers, here is the question. Are the bottom end internals the same as the 4.3l non marine engine? If they are in fact marine specific, then where is a reasonably priced place to get the rebuild kit, as those seem hard to come by. I would like to just get the non marine kit, since it is half the cost, and very easy to find.
 

Bondo

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Apr 17, 2002
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71,083
Re: engine kit

All the Same Parts,..........

Have your Machinest point you in the Right Direction,.......

You'll probably be dealing with Under-sized or Over-sized parts.....
 

mowerman

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Jan 15, 2007
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Re: engine kit

Thanks Bondo. Thats a relief.
I was watching the rebuild price grow rapidly every time the part had "marine" next to it. As for the bearings and rings, yea I figured that. I`m gonna have to have the rods reconditioned due to two of them getting scored. The crank also needs turned. Then I figured I might as well have the block magged and honed since I already had everything apart. I did the heads and carb year and a half ago, so top end is good to go already.
 

Don S

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62,321
Re: engine kit

You do realize that after all that machineing, that YOU and only YOU are responsible for everything being absolutly clean (including oil passages in everything) and that all the dimensions are where they should be on the bearings, cylinder to piston clearance, ring clearance, end play, valve guide to valve clearance, and everything else that is involved in "REBUILDING" and engine. You do not have a "Stick the New Parts in and RUN it" type job here. It takes a lot of careful car to make an engine run great for a long time.
 

KaGee

Admiral
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Aug 14, 2004
Messages
7,069
Re: engine kit

To re-enforce Bondo... My OMC manual says to consult your local Chevy parts dealer for the "internals". I'd give the block to the machine shop and let them re-do the bottom end.
 

aerwin

Petty Officer 2nd Class
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Mar 28, 2002
Messages
192
Re: engine kit

have that sucker blueprinted and balanced also, you will get a smoother running engine, well worth the little extra
 

1978 century

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Jan 16, 2007
Messages
24
Re: engine kit

if it spun a bearing i would get a new crank..the prices for cranks are usally clos to the same as having a shop machine the bad 1....yea all the parts are the same im sure of ...the only thing thats not the same is the cam...make sure to check all of your clearences when assembling and plasti gague is good to use to check bearing oil clearences and dont be shi with the assembly lube but be very clean when assembling.blue printing and balancing is un nessary its not a race engine....also be sure to break in the cam and adj the rockers right the u should have a good running engine..if i were you id just get a new crank main and rod bearings oil pump timming chain and call it a day...the cost to totally rebuild the engine you can get a good used one
 

Gary H NC

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Dec 1, 2005
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8,972
Re: engine kit

"the cost to totally rebuild the engine you can get a good used one"

And why would anyone go to all the work to put in a USED engine? And if its used how do you know how good it is?
 

1978 century

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Jan 16, 2007
Messages
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Re: engine kit

all that work? lol haha....thank god ur not a auto mechanic..if u think that alot of work you would hate it ..i am and id rather put a 4.3 in a boat in a snow storm that put a 4.3 in a blazer...and as far as gettin a good used 1 look in the swap sheet theres always some kind of deal like a boat was in a accident or the floors are rotted and u can here the engine run befor its pulled.and do a compression check and so on if u dont know how to check a motor over to see if its a good solid mortor you have no business rebuilding 1 or giving advise if you dont have a clue about what ur talkin about..you do the math i seen a few engines in the swap sheet for 200 to 400 bucks...to rebuild it right with some good parts not thoes 100 buck set of pistons and a 100 buck cam no china 10 buck gasket kit b.s. its gonn be 1500 with machine work mabey more..
 

1978 century

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Jan 16, 2007
Messages
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Re: engine kit

and also its all about what the guy intends on doin with the boat ,if hes gonna keepit for ever and drive it alot then i might rebuild it too, but to most people boats arent like cars you dont drive them every day and they dont get the ware and tear that cars do because of that..i dont know how confident he is on rebuilding it ..but if its just the weekend once in a while why not put a nice used engine in, cost will be alot lower....but thats my way of looking at it cuz i only take mine out like 3 days of each month in the summer
 

mowerman

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Jan 15, 2007
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Re: engine kit

Don and Kagee, thanks for the concern. I do understand what has to happen here. The plan right now is to send the block in for a cleaning, mag, and minimal bore. I am going to have the shop put the cam bearings in, since those are a kind of a pain. They are going to charge $20 + the cost of the bearings. Too cheap for me to mess with. They are going to check the rods and see if they can recondition them, if not, then I`ll have to get new ones. As for the crank, the cost to turn it is nowhere near the price of a new one, so I will be having it machined.

In response to 78Century, I would not even think of putting a used engine in my boat uless I knew exactly where it was coming from and its history, like a friends boat or something along those lines. GM 4.3l parts are not that expensive in comparison to other engine families. With the machine work and the parts, I will be in under $800. That figure does not reflect my time equity to rebuild it of course. No way would I spend $400 for a used unknown condition engine. My TIME and money are too valuable to me to take a $400 chance that I will have to remove it again, and this time rebuild it. What do you do, just keep throwing money and engines into something? When the first engine craps out in 20 hours and your on your second engine, well you just paid for the rebuilt one and you only had to do all the work once. No I`m not putting it in a S-10, but its time non the less. On a slightly different thought pattern here, If it were a woods buggy that I used for hunting or something maybe, since I can just WALK away from it. But if you have ever been dead in the water at night with barge traffic you would understand the value of a new engine in a boat.

Oh yea, one other thing. Blueprinting and balancing ARE important. A boat engine is in a way a race engine. Think about what it has to do. Your boat motor is constantly running at WOT or at least high RPM`s And most people do this all at once meaning pushing the throttle all the way when leaving dock or no wake zones. Do you drive your car like that, probably not. The point is a well balanced engine will always perform better and last longer. What does it cost above and beyond the initial rebuild?? Not much except time and attention to detail.
 

1978 century

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Jan 16, 2007
Messages
24
Re: engine kit

well guess u didnt read what i wrote at all..if you have a brain you can find a good engine and check it out .i put a used engine in my fathers boat 6 years ago and hes put over 180 hrs on his 4.3....if you get a good engine kit they come balanced and come with a new balancer..and as far as blue printing and balancing it is not nessary but if ur gettin made in china parts yea it is and in that matter if your so worried get it torq plate bored and honed.. and im sure ur not inclouding a valve job..oh yea my mustang gets the **** beat out of it every day. and i run a tank of nitrous 175 shot every week for the last 20k .i rebuilt it and it cost 2700,no bule printing kit came balanced ...but thats up to you personally i would rather put a used engine than do a 800 dollar hack rebuild .if you had a good machine shop do the block work it should be a few hunderd easly ..but if u wanna waste money on junk part go right ahead thats why they sell them for people like u that are dumb enough to buy them
 

1978 century

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Jan 16, 2007
Messages
24
Re: engine kit

i looked up some good parts
cam and lifters 189
crank 219
forged pistons(no cast or hyper crap 369
roller timing chain and gears 59
all bearings 75
high volume oil pump 48
marine gasket set complete 99
the best machinest around here will charge around 450 and thats cam bearings head milling deck milling bore and hone clean pressure check valve job recon rods

so theres 1508 plus tax to do a job that will last and there will be more little things to buy
 

bjcsc

Lieutenant Commander
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Jun 1, 2006
Messages
1,805
Re: engine kit

1978 Century, in his own way no doubt, brings up some interesting points. Given his and Don S's response, what is normal for a quality rebuild? I mean, because I don't know, what is the difference between the $800 rebuild you're getting and the $1500+ rebuild Century is posting? If Bond-o or Don S. were doing this job, what would it run out at? How do you know you're getting a quality job? Are they giving you a waranty?
 

mowerman

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Jan 15, 2007
Messages
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Re: engine kit

Ok, I can see where this is going. I dont want to get in any kind of spitting match here, its inappropriate and not related to the question I originally posted. Maybe my last post was partly out of line, and for that I apologize if I sounded a bit crabby. I simply wanted to know if the core engine parts were the same as a non marine issued engine, and that was answered.

Hey 78, just in case your still curious, here is the rough breakdown.

Machine work

turn crank
recon rods
all block work
cam bearings
NO head work $445

Other parts

hyper pistons
rings
gaskets
hv oil pump $279
cam/lifters $125

Thats $850, so I was a little wrong in my inital estimate.
and if you throw in the new timing set (which I dont need) I am still under $900 (my bad) This is all bottom end work only. Nothing else. All top end is already finished.

No there is no warrenty from myself, but I trust me.
 

Reel Poor

Vice Admiral
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Jan 29, 2005
Messages
5,522
Re: engine kit

Don't forget about the lifters. Either replace or disassemble them and clean em. They will contain metal particals from the spun bearing.
 

bjcsc

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Joined
Jun 1, 2006
Messages
1,805
Re: engine kit

I wasn't trying to take this anywhere. I am no pro mechanic, but my understanding was (as I once thought I had spun a bearing) that the entire engine had to be rebuilt after a spun bearing as tiny metal goes everywhere - even into your new head. I thought I learned that on this forum? But whatever, march on. The core engine parts are the same...
 

mowerman

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Jan 15, 2007
Messages
5
Re: engine kit

reel poor, bjcsc...

good point guys, truthfully I had not yet given any thought that the pushrods or lifters may be clogged. I have gotten sidetracked with work, so this whole project has been delayed. Most likely whats going to happen is that they will both be replaced. Oh, bjcsc, I was not meaning anything towards you at all, sorry if it sounded that way.
 

1978 century

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Joined
Jan 16, 2007
Messages
24
Re: engine kit

srry about the kinda rude comment ive just had a rough week...i just like to use the the best aftermarket forged parts cuz i beat the crap out of my boat and mustang..and i get alot of this from my uncle cuz hes a machinest...hey did you get the crank out yet? just want to know if ur positive that that crank bearin spun.cuz thoes usally have bad wrist pins cuz from the factory made the piston to wall clearance being to close .. make sure u get some plasti gauge for thoes bearing clearances..just get an air hose to clean ur push rods out if ur not gonna replace..and laping the valves your self is a good idea the tool and the compound is only like 15 bucks and like a extra few hours to do
 

f_inscreenname

Commander
Joined
Aug 23, 2001
Messages
2,591
Re: engine kit

4.3 master kit at Northern is only $400.00
Many here has used them and I have never herd a complaint about them.
http://www.naparts.com/Products.cfm?CategoryId=76&DisplayImages=0
Thats with;
Federal Mogul Seal Power Rings

Federal Mogul Seal Power Pistons

Federal Mogul Rod Brgs

Federal Mogul Main Brgs

Federal Mogul Cambrgs

Melling Oil Pump

Federal Mogul Camshaft

Federal Mougl Lifters

Melling Timing Components

Pioneer Frost Plugs

Felpro Gaskets

I say if you have the skill rebuild it and leave the crate motor for the folks with money to burn and don't care whats inside as long as it runs.
 
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