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Mercury 8hp 1977

J

jim fendryk

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Trying to locate filler/drain

Trying to locate filler/drain plug for lowereunit gear lube. They say to cahange yearly. Missed the fall empty so now I want to clean out and refill before serious boating. They also tell me to look for presence of water. Thanks for the help
 
"Jim, if you are standing behi

"Jim, if you are standing behind the motor, looking at the prop, the two plugs (screws) should be on the right hand side - one immediately below the cavitation plate and the second a few inches below that (after the swell of the gearcase).

I have one question though - your topic says 1977 8 horse - Merc only started building the 8 horse in 1986 - what exactly do you have? An 8 horse Mariner maybe??"
 
No Graham - it IS a 1987 8HP.

No Graham - it IS a 1987 8HP. M}y error on the typing skills. Do you reccommend any specific brand for gear oil for older engines ?
thanks so much for the help.
 
"87 old? My "newer" 9.

"87 old? My "newer" 9.9 is an 87


I own 3 motors from this series, an 86, 87 and a 91 - over 5000 hours use between the 3 of them.

For as long as I can remember I have been using a "Premium Marine Gear Oil" from a local auto parts chain (I think it sells for about 6 bucks a quart). Could spend double that on a "Merc" product, but have never seen the need. If you change it anually (like the book says) even a low quality oil would be fine in my opinion.

The store brand I use is simply a GL5 rated 90 weight marine gear oil - great stuff.

Either that or all my motors have "super gears"
"
 
"Sorry, should have added a di

"Sorry, should have added a diagram for ya. Number 3 is the vent plug and number 8 is the drain.

Wouldn't hurt to stop at a Merc dealer (or any ouboard dealer) and get a couple of rubber washers (seals) #4 and #9 - generic in size amongst most outboards, sell for about 50 cents a pair and keep the water and other cooties out of the lower unit through the plugs...

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