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merc 500 efi

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Old 11-01-2009, 08:36 PM
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merc 500 efi

Hey, im Justin just purchased an 02 black thunder 46 ec with twin merc 500 efiís with about 160 hours on them. I am looking for any information I can get on these motors and or black thunders as this is my first one. Specifically I have heard that the valve springs should be changed and am curious what manufacturer makes the best kit for this. Any information would be greatly appreciated. It will have a long time to tinker with her till warm weather hits again looking forward to hitting the water next year.
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Old 11-01-2009, 08:46 PM
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The carbed HP500's were the ones with the premature valve spring failures. They used Crane springs and the inner springs were the ones that broke. The 500EFI's used Comp Cam 929-16 springs that had much better life.

Last edited by bob_t; 11-01-2009 at 09:05 PM.
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Old 11-01-2009, 08:47 PM
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Welcome. Checkout the Black Thunder forum on here also. As far as your 500efi ???'s, others that know more than me will chime in and help. Again, welcome to OSO

Chris
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Old 11-01-2009, 09:04 PM
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You shouldn't need to do anything to the 500efi's other than change the oil until about 250hrs. Then its about time for a leak down test to check the health of the valves and maybe a valve job, head gaskets and springs in the 250-300hr range.
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Old 11-01-2009, 09:32 PM
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My 250 Hr HP500EFI had 3 broken inner springs out of two motors.

I replaced them during last winter when I had to replace drive couplers. Not a hard job.
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Old 11-01-2009, 10:09 PM
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Cut open the oil filters ck for metal..do a leak down, if its ok and the previous owner took care of it ,Run it.

if ya have extra money,put the 929's in it,if ya pull the motors plate hone,rings. bearings,head job,put the felpro head gaskets in it.

hey post some pick of ya new ride
Rob
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Old 11-02-2009, 08:30 AM
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Welcome to ihe BT family. Going to pull my 500s out this week for inspection and couplings.
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Old 11-02-2009, 11:57 AM
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Is this the red one that has the Black Thunder logo on the sides? Been in that boat a couple times and my mechanic up in Lake George, NY serviced it. Talk about a condo on water!
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Old 11-02-2009, 07:32 PM
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thanks for the information it is very heplfull. I will post some pics as soon as it gets back from the detailer she was prety filthy. I am also looking for someone in my area to get paint fixed it must have sat in the water and the paint is bubbled at water line. I know mitcher t does alot of BTs but he is a good hall from milwaukee
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Old 11-02-2009, 11:12 PM
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Quote:
Originally Posted by jus490 View Post
thanks for the information it is very heplfull. I will post some pics as soon as it gets back from the detailer she was prety filthy. I am also looking for someone in my area to get paint fixed it must have sat in the water and the paint is bubbled at water line. I know mitcher t does alot of BTs but he is a good hall from milwaukee
It was 877 miles for me from Mississippi.Dont make the drive the resason for not using someone,But for me New York was too far.

Rob
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