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I am looking at a boat for sale with 500 EFI's that have just under 300 hours.

what maintenance should I expect in the near future ?

how many hours can these engines go before they need to be rebuilt ?


any feedback on these engines will be greatly appreciated

thanks in advance
gary



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Many will tell you at those hours the top ends should be freshened. Head gaskets upgraded to Mls vs the stock single layer which are prone to failure. Valve springs are also a hot topic, 250 hrs is the common interval on the stock springs. A broken spring will make a disaster out of your internals after the unsupported valve drops into the engine.

Other wise maintenance will be similar to any merc bbc engine.

Agree on the head gaskets, have seen way to many go bad 250-300 hours, good advice from 4bus on the springs.

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thanks for the feedback

so if I were to buy this boat Im guessing I should do "the top ends" right away

how much approx. does that cost ?

trying to figure out how much I want to offer on the boat

thanks in advance



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if u get to them before some thing go's it will run u about 2 to 3k per motor. if u have to do a full rebuild on one if some thing go's its around 8k. im at 345 hours and i broke one so now it has all been adding up. if u have one out and the other top off its better to just do as much as u can because its all open. and it adds up fast, i was just looking to do top ends for 4k and now 4 months in im at 20k.

read this one i started before getting my new boat covers what u r asking just faster lol
http://www.offshoreonly.com/forums/g...7-500efis.html

I was thinking as soon as I get the boat , before I even use it , I address this "top end"

so... I need to do valve springs and head gasket


anything else for maintenance ??? while Im at it ?

impellers, plugs,cap,belts and filters r always good to do too

i would do the lifters to that is what broke on mine and coused the full rebuild with a new cam
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thanks for the link