1990 Mercruiser 5.7 needs replaced

[kdmiller8251]

Ok, I believe my engine is messed up and needs to be replaced Access to the engine is very easy.. Roughly anyideas what this might cost???<br /><br />Tallman

 

[coupedeville]

Re: 1990 Mercruiser 5.7 needs replaced

What, specifically? Removing the engine, or rebuilding/ replacing it?

 

[Walt T]

Re: 1990 Mercruiser 5.7 needs replaced

To r&r an engine with easy access, about 4-5 hours. Trouble is, easy access doesnt take into account rusted/corroded bolts and the like. Allow 6 hours for the r&r.

 

[kdmiller8251]

Re: 1990 Mercruiser 5.7 needs replaced

Looking at both Removing and replacing. I dont know what is wrong yet and just trying to get a worse case idea. All I know is that is wont turn over any more. Dont know if its cause the drive or something in the motor. I know the starter is good, I checked that.<br /><br />Tallman

 

[vinney]

Re: 1990 Mercruiser 5.7 needs replaced

The queston is not the remove and replacement of the engine. It is what are you going to put back in its place. You have alot of choices and if you make the wrong one you will be plagued with water ingestion problems. v

 

[Capt Ken]

Re: 1990 Mercruiser 5.7 needs replaced

12 year old engine, hmmm? I would probably go for a repower of a new engine. By the time you figure the cost of a block assembly, manifolds, labor and other stuff, its not much more for a new set up that will bolt in and have a warranty from Mercruiser. You can always piece it together, but then you'll always have a pieced together engine that may not be dependable. It doesn't take more than a day to swap one out.

 

[coupedeville]

Re: 1990 Mercruiser 5.7 needs replaced

Out of curiosity, what are we talking, dollar wise, for a brand new 5.7 from Mercury?

 

[ndemge]

Re: 1990 Mercruiser 5.7 needs replaced

Looks like a good excuse to drop in a 454 to me

 

[Capt Ken]

Re: 1990 Mercruiser 5.7 needs replaced

You would be looking at $5500 for a new replacment engine from Mercruiser. That's everything new from bellhousing to pullys. Depending on the shop, you should be looking around $500 for the swap over. Only problem is the carbed 5.7 is only rated at 250 hp. Now for couple hundred more you could get the MPI 5.0 rated at 260 hp. I personally would go for the MPI. Kinda like sex, once you tried it, you'll never go back.

 

[geriksen]

Re: 1990 Mercruiser 5.7 needs replaced

Yep

 

[kdmiller8251]

Re: 1990 Mercruiser 5.7 needs replaced

I have seen different rebuilt longblocks on line for 1200-2000.. Are these anygood??? They all have warranties.<br /><br />Tallman

 

[flashback]

Re: 1990 Mercruiser 5.7 needs replaced

like you said, it might be the outdrive thats locking things up, might be a good idea to remove the outdrive before you scrap the engine......just to see..........

 

[coupedeville]

Re: 1990 Mercruiser 5.7 needs replaced

$5500 for a 250 horse 350? Sweet mother of mercy. That's a lot of friggin money for a lo-po Mouse motor. $3500 will get you a 355hp ZZ4 crate motor from GM Performance Parts. $5400 will get you a 450 horse 502! That 250 horse 350 is all of $1900 , brand new, from General Motors. Part #10067353.<br />Yes, yes, before you all start writing me indignant messages about them "not being boat engines", I realize that fact. But still, that's a whopping big price difference. And there isn't that much difference.<br />Go here: http://www.goautocenter.com/engines.htm and have a look.

 

[Capt Ken]

Re: 1990 Mercruiser 5.7 needs replaced

Hey Coupe, does that crate engine have new marine manifolds, alternator, carb, starter and everything needed to run. When I say complete, I mean take it out of the box and set it in the boat ready to run. And by the way the $1900 long block automobile crate engine will cost you a grand more in the marine configuration. Like compairing apples and sardines. Lets don't go there!!!

 

[kdmiller8251]

Re: 1990 Mercruiser 5.7 needs replaced

Dont me to break up the bickering on Auto Vs marine. But the engines I have been looking at are labeled as marine and I will swap all parts over from the old engine.<br />Anyone have any luck with these???

 

[coupedeville]

Re: 1990 Mercruiser 5.7 needs replaced

Actually, they do have marine engines for those prices.<br />And no, Ken, they are not complete - but Tallman doesn't need a "complete" package - he already has all those parts on his current engine. If he didn't have an engine, or was changing over from a completly different setup [Ford, Mopar, etc.], then he'd need all those things. Take them off the old, and put them on the new. For a saving of $3000, it's worth the trouble.<br />A friend of mine runs a garage. If someone needs a motor, he replaces the long block. He doesn't buy a new distributor, water pump, carb, alternator, starter or anything else. Why would he? It's not neccesary.<br />It's Tallman's money, he's the one writing out the check.

 

[geriksen]

Re: 1990 Mercruiser 5.7 needs replaced

How about taking your boat to a real marine repair shop and having them tell you what is actually wrong with it? You never know, it might be a minor deal. Spend about $200.00 and know what you have. If it does need an engine Ken has it right. You would have a new engine under warranty. Same money, less problems and the boat is sellable.

 

[Walter]

Re: 1990 Mercruiser 5.7 needs replaced

Tallman...<br /><br />I swapped out my MerCruiser 305 for a rebuilt marine 350 that a very reputable auto shop built for me. All the "bolt-ons" from the 305 went on the new engine. I bought new exhaust manifolds, starter, water pump, and rebuilt the carb. All told I was into the engine for about $3,000. A marine tech buddy of mine helped me with the engine removal/install and we went thru the outdrive--replaced all rubber, senders, etc...<br /><br />A new MerCruiser factory crate engine as Capt. Ken describes would be the most reliable & carry the best warranty...however, that also comes with the highest price tag. Unless you're planning to keep your boat for a very long time...I don't know if spending that kind of money would be worth it.<br /><br />Look at all your options...and make darn certain you're current engine needs to be exchanged!<br /><br />Good luck...<br /><br />Walt

 

[kdmiller8251]

Re: 1990 Mercruiser 5.7 needs replaced

Thanks for all the help, I do plan on taking it and finding out exactly what might be wrong. I just want to get all my ducks in a row before hand so I know what kind of coin I am going to have to put out.. I finally just got all my other bills paid off from this thing and now once again I got to shell out the $$$. I love boating!!! HA HA

 

[John Carpenter]

Re: 1990 Mercruiser 5.7 needs replaced

I have to chime in with Walter & Coupedeville here. I know the issues involved with the differences between Marine & Auto. IMO you need to look at how you use the boat & how often, how long you intend to keep it, the state of your bank account etc. I have replaced three engines and each time have gone from 305 to 350 with rebuilt long blocks. Never had a problem with any of them. Either DIY or use a marine mechanic...automotive mechanics have a different mind set and may not know why some things need to be done differently. I understand that I have not taken the recommended path on my rebuilds. That said I have spent a lot less money and have had no problems. There are a number of issues to address BEFORE you buy a long block. If you decide to repower and you take this route...feel free to e-mail me & I will be glad to go over some of the problems I encountered.