Rebuild or repower
#1
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I currently have a gen 6 454 mag mpi freshwater Cooled straight inboard with a zf transmission in my 27 conch center console. I'm contemplating having the block rebuilt for around 4500 over the winter and putting all new coolers etc back on. A few people are stating to stay away from rebuilding and just get a new engine. The only engine I have come across in gas with that torque and hp is the ilmor 6.2 gdi. Marine Power has a model but I'm being told parts are tough to come by. The ilmore engine will be around 32k . Just wondering if anyone has had any luck with rebuilds.
thanks
thanks
#2
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I would rebuild what you hand if you have a good shop. At least you know what you are getting.
Find out what is included for 4500. Sounds cheap?
Where are you located? Maybe a member can recommend a good rebuilder for you?
Find out what is included for 4500. Sounds cheap?
Where are you located? Maybe a member can recommend a good rebuilder for you?
#4
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What is wrong with your present engine that you think it needs rebuilding ? How many hours ? I would be a little leery of anyone who says they can do one of those correctly for $4500. I can look up some parts prices to be sure but i would expect closer to $7000 Does Mercruiser offer a reman for your engine ?
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Griff (11-13-2023)
#5
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Currently 2700 hours. I do manifolds and risers every 4-5 years and keep up on all the maintenance. I commercial fish with this boat so I'd rather do it over the winter than deal with it during the season. It's running great but I know the day is coming with the hours. No I can't get a gen vi 454 block otherwise I would
#8
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#9
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Fresh water cooled...I would rebuild. You've proven the combo and setup. Changing anything can create unforseen issues during your working season. 2700 hrs on a mild roller cam...it may still be gtg.
Have you done a compression test?
If you did one every season when you do plugs, you have a baseline of how it's doing. Maybe just needs a hone and re-ring and clean up the guides and valve job.
Merc has a very good handle on engine tolerance specs in the shop manuals.
A Gen VI 1999 Merc I just tore down, with 600 hrs had 4.251" bores and cross hatch.
Have you done a compression test?
If you did one every season when you do plugs, you have a baseline of how it's doing. Maybe just needs a hone and re-ring and clean up the guides and valve job.
Merc has a very good handle on engine tolerance specs in the shop manuals.
A Gen VI 1999 Merc I just tore down, with 600 hrs had 4.251" bores and cross hatch.
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carnutsx2 (11-19-2023)
#10
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Commercial fish….SE MASS…new manifolds/risers every 4-5…..sounds like salt water to me…