502s merc owners
09-03-2006 | 01:50 AM
#11
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From: EASTON MA.
Re: 502s merc owners
I have a 12yr old 502 pushing 650hp its been rebuilt to bottom once and everything was fine I wasted my money didn't need it this winter we will change the springs and check everything else again its been 6yrs 
it started as a 1993 502 390 hp and grew from there 
it started as a 1993 502 390 hp and grew from there
09-03-2006 | 06:04 AM
#12
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Re: 502s merc owners
thanks guys for the feedback. i am kinda new at this and was doing some investigating .and when that salesman told me that the 2000 502 mpi was a problem child i got really confused ???? because i know there was alot of them in service .thats way this place is great for info..
so it looks like the only thing was it likes to burn alittle oil i can live with that thanks again keep the feedback comming love to here all inputs
so it looks like the only thing was it likes to burn alittle oil i can live with that thanks again keep the feedback comming love to here all inputs
09-03-2006 | 12:52 PM
#13
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Re: 502s merc owners
Originally Posted by camptappakeg69
Just bought a 97 AT with a 502 mag motor, had 400hrs on it at now has 427 on it burns a little oil but runs great but it has been very well maintianed and relatively stock except for gil exhuast and msd
Stephen Jones
09-03-2006 | 02:28 PM
#14
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From: Henderson, NY
Re: 502s merc owners
Originally Posted by Smarty
I sent you an e-mail regarding your 502, with the Gils, please touch base when you can. Thanks
Stephen Jones
Stephen Jones
Mike
09-03-2006 | 05:40 PM
#15
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From: Northeast,Fla
Re: 502s merc owners
Originally Posted by anotherdimension
i have a pair of 2000 502s they have 280 hours each so far major things have been all manifolds and risers,and a failed inlet manifold on the other due to corrosion , im having problems with rpm also but think thats down to the inlet manifold failing and water getting in the engine , i run in salt water which i dont think suits the 502, been told that the 496 runs fresh water round the block which has to be better!the previous owner to me never flushed through think thats caused a lot of my problems,been told that the biggest failing is the inlet manifold corroding causing water to get in the motor,then the problems start.thats my experiance so far
Where was the corrosion on the intake leak ? I have seen them corrode were the intake mates with the head .... is that where the leak starts ? Thanks ....mike
09-03-2006 | 05:48 PM
#16
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From: Tampa
Re: 502s merc owners
the 502 Magnum MPI was a solid engine. We ran them in APBA E-Class with no problems. The only thing to concern yourself with this engine is the exhaust manifold are very prone to leak inside at the flange and to revert water. Just take the exhaust manifolds off and look up the post and see if the valve stems are eaten away. This happens easy in saltwater. Also check the indies of the exhause manifolds and risers for signs of leaking too.
09-03-2006 | 09:36 PM
#18
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From: Paducah, KY
Re: 502s merc owners
something to consider, there are a LOT of 502's running up and down the lakes, if they were problematic it would be wide spread news. You do not need anyone to contridict what the salesman said ,the lack of negative press is the ultimate proof the 502 is a reasonably strong contender in the boat world.
