Lower unit fill hole is blocked!

D

debsfishinboat

Recruit
Joined
May 5, 2012
Messages
2
My 1975 90 hp merc. there is something in the way for me to pump 80-90 in to the lower unit. I can see it thur the little fill hole, it is something inside, blocking the hole. Moving my gear shift, don't help. WHAT CAN IT BE? And I suppose I fill it to the top hole with lube, right. Thanks. "Deb's fixer"
 
rickryder

rickryder

Commander
Joined
Jun 24, 2010
Messages
2,722
Re: Lower unit fill hole is blocked!

Fill from the bottom hole till it runs out the top hole.
 
jerryjerry05

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
18,196
Re: Lower unit fill hole is blocked!

You try moving it with a screwdriver?
GENTLY push on it.See if it moves.
Was there a small magnet on the end of the drain plug?
Pics?
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,909
Re: Lower unit fill hole is blocked!

It is either a chunk of metal (bad) or a piece of an old gasket (not so bad). See if you can determine if it is hard (metal) or soft. If soft, try a small screw or punch and see if you can grab it and drag it out.

If it is a chunk of metal, the gears may be bad....
 
Silvertip

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Lower unit fill hole is blocked!

Are you sure you are looking at the DRAIN/FILL hole? You drain the lower unit by removing the big screw in the underside of the lower unit gear housing. You remove the top screw to serve as a vent. You then FILL the lower unit throught the drain hole until fluid comes out the top hole.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,938
Re: Lower unit fill hole is blocked!

Your looking at the top vent screw and what your see is the top of bearing race....
 
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