I have a 1998 mariner 300 supermag with a bobs coned lower unit sn dc708016 how is the best way to clean debri from lower unit and poppet valves will the service manual show you how or is there a page on here that shows it having overheating problems when engine gets much above idle no issues when idling in gear in no wake zones just when you get boat up on plane the overheat buzzer goes off any help would be appreciated thanks
Sorry I never had a lower unit coned by Bobs.....
Can you pull poppet valves and thermostats and put water to the lower unit on a hose to flush engine out
No the water pump must be turning.
Is there any way to flush the engine
Yes by attaching a hose to the water pump discharge tube.
Can I do it with poppet valves and thermostats out so it flushes everything out thanks
As long as you don't start the motor and can keep water off of all the electrical components.
Thank you very much appreciate your time
If you would, please update your serial number (digit, Letter, Six Digits). Example: 0G123456, 0C123456.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Instead of a dc would it be oc the boat is new to me it's in storage away from home while I redo the trailer will be a few weeks before I get it home the tag on the engine is faded really bad hard to read can't see as good as I used to is the number stamped in the block that may be easier to see
Oc 708016 if this is not it will have to look when I bring boat home sorry
Nope- that's a MerCruiser engine serial number. Even tried 0"G"708016 (no go).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Is there somewhere on the block or somewhere else I can find serial number can't read the tag faded to bad
Need to find out the correct number the number I gave my insurance company will be wrong also
Mine was hard to find too - I eventually found it stamped on a freeze plugOriginally Posted by Tdparrish
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
Check the PORT side of the engine block, at the mating flange for the front and rear "halves".
See if the serial number is stamped into the case (often was on race product).
Otherwise, check for decal on swivel bracket, transom brackets, or an aluminum welch plug in the block.
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Is this a good number og708046 I hope it is this is a pain when your not sure on number
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