Engine freshen up cost ???
 

I'm just curious what is normal ( if there is such thing) on cost to have say two 502 Mags pulled, freshened up, and put back in ??

Also how many hours are most putting on there engines before a rebuild on average ?? Just curious, Thanks.

No one ???

You mean drop it off and pick it up you do no work? For 2 rebuilds and the labor of removing replacing, cleaning etc I would say 10k to 14k.

Regarding hours it's all over the place depending how they were run and taken care of. Those engines should go 750 to 1000 hours unless they were either run real hard or not taken care of.

I'd double the above estimate.

I just did an 8.1, came out to $9500 for remove, rebuild, reinstall, sea trial.

So up to 28k to rebuild 2 stock 502mags (assuming they are tired and not blown up, seized etc? That seems a little high to me, although I usually do most work myself so I guess I'm a little out of touch with engine builder/marina rates.

If the motors are well taken care of from new, i mean change oil and filters every 50 hrs or so don't overheat them and fog them when winterizing and dont store them in a salt air environment- you should get 2000+ hrs out of them. as far as the rebuild go i would buy two brand new long block 502's for 6500 each and removing the old ones dressing the new and installing 2400. for about 16000 two new motors installed and sell the old ones

I would at least check the valve train at 400 to be safe. And if the motors are out. Take a look at the mains.
Peace of mind.

Pistons $500
Rings $180
Bearings $150
Freeze plugs etc $50
Machine block $500
Polish crank $100
Recondition rods $150
New water pump
Flow and clean injectors
Valves
Springs
Gaskets
Belt
Oil
Fuel filter
Spark plugs
Wires
Thermostat
Manifolds
Risers
Add it all up, adds up quick. Now if you do it yourself, pulling stripping dressing etc can save a lot

That sounds about what I was thinking would be. But to double ?? SJ

I stand by double. You may find a fly by night shop to remove, rebuild and reinstall a marine engine for 5 to 7 grand each, but a real and competent shop will be considerably more.

This is a situation where you will get what you pay for and the value will be in a quality job as apposed to front end savings

Thanks for the input and info guys.. SJ

I'm not sure about any pricing because I do all of my own work, but I will say that it seems that a lot of people think that engines are done at the 400-500 hour mark.

Head work "could" be required, but that may be more to do with corrosion than anything else. Merc's blue motors need top end work at predetermined hours because of the stresses put on the valve springs, but that's about it.

I went through my 454 Mag because I found that there was a questionable piston in hole number two (I was adding a blower and didn't want to risk anything... had I not added the blower, I would have let it be). Outside of that piston issue, the rest of the engine was pristine, and that was with 400+ hours (the thing looked brand new inside). Let me add that the heads were changed before I bought the boat, but the issue was from a corrosion failure.

With the above said...(you didn't mention hours or condition)... If the engines are reliable and running well, and not using oil outside of specs, then I'd leave them alone.

Parasail boats I ran we had 330hp 454s with 4000 hours on them running like a champ.

Saltwater motors , put new risers on after a 2nd year, new manifolds and risers year 3 , and after year 4 new motor.
Motors still ran great , just beyond their useful life.

Ran them pretty hard too. Not wide open all the time but 4000 rpms could be pretty common.

Had a PTO running off the front of the motor pulling 30 - 40 horse engaging and disengaging 1000s of times over also.