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    200 efi crankshaft

    My 200 efi crankshaft has a small spot that is blued on one of the main bearing journals. Blued area is approximately 1" by 3/16" on the radius on the upper edge of the bearing surface. Is this crank usable?
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    200 EFI Oil Pump Drive Gear

    Installing a used crank in my 2001 200 EFI Merc. Crank looks good but the oil pump drive gear seems to be loose on the crank. The gear teeth look unhurt. Mercury shop manual says not to replace gear unless it displays excessive looseness. Can anyone define "excessive looseness" for me? I...
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    Oil Injection Gear on Crank

    Is the composite oil injection gear on the crankshaft of a 2001 200 efi, 0T391597, supposed to be a tight fit? The crank and gear appear to be undamaged but the gear seems to have quite a bit of "slop" on the crank. I don't want to replace the gear unless it is necessary.
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    Initial Start for 200efi

    I have a 98 200 efi powerhead that has been rebuilt and put on the shelf for a year. The factory service manual was followed for torque values, tightening procedures, and assembly lubes. Are there any special procedures I should use for startup? The oil line from the bottom of the crank to...
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    200 EFI knock sensor

    Usually I find my answers in the archives but I find no reference to my present issue, so I will bother you folks if you don't mind. Let me start by saying it has been around 20 years since I have attempted a job like this. I'm finishing up a refresh/repair of my 2001 Merc 200 EFI. The heads...
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    head bolts vs studs

    I am putting new head gaskets on a 2001 200 EFI Mercury. The heads have a note cast into them that says not to re-use the head bolts. The note says to torque new bolts to 30 lb./ft. and then 90 degrees. I am considering going with grade 8 studs instead of bolts. Does anyone have a swag at...
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    EFI vs oil injection failure diagnosis

    I'm rebuiding a 2001, 200 EFI Merc. As I make the rounds looking for parts, I can't help but notice a large number of engine failures similar to mine; a single cylinder melts down and/or seizes sometimes pulling the wristpin out and beating the cylinder up. Almost invariably, the oil injection...
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    model year differences in electronics & myth busting

    I recently purchased a bass boat with a deceased 2001, 200 horsepower, 2.5 Merc on it. One piston had melted to the point it seized and jerked the rod from the piston promptly ventilating the block, front and back half. The crank appears to be unhurt and I have a good 98 model block. I have 2...
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