How to add lower unit gear oil

[smokeyblaze]

I only see one screw.

 

[Laddies]

Re: How to add lower unit gear oil

The drain screw is on the same side front, bottom of the bullet. Fill from the bottom drain till it comes out the top vent screw in you photo

 

[smokeyblaze]

Re: How to add lower unit gear oil

Ok I found it , but what I don't understand is how the lube stays in the lower unit with the all the holes in it.

 

[les morgan]

Re: How to add lower unit gear oil

there is actually only three holes in the lower unit. The drain hole-the vent
(upper)hole and the big hole for the propeller shaft. The Bullet part of the
lower unit is a closed system...

 

[Alden]

Re: How to add lower unit gear oil

If you haven't already, invest $10 in a gear lube pump. Lots easier than squeezing tubes.

 

[mhlbnghm]

Re: How to add lower unit gear oil

Not nearly as messy either

JMB

 

[smokeyblaze]

Re: How to add lower unit gear oil

What about these holes? (click thumbnails)

 

[saumon]

Re: How to add lower unit gear oil

Thoses holes were not part of the enclosed gears system. They are water pick-up holes for the water-cooling system.

 

[Moody Blue]

Re: How to add lower unit gear oil

Negative Saumon, you missed what was highlighted in the photos.

Can't remember seeing them on my motor but they could be drain holes for water from the midsection. Not likely access to the actual LU gearcase.

 

[saumon]

Re: How to add lower unit gear oil

Sorry, i can't open the pics at imageshack so i thought he talks about these holes. I didn't see anything on the thumbnails...

 

[smokeyblaze]

Re: How to add lower unit gear oil

Where can I get the gaskets i need?

 

[emckelvy]

Re: How to add lower unit gear oil

Not sure what gaskets you need, for the drain plug/screw?? You can find parts diagrams for your motor here:

http://www.mercruiserparts.com/SelectModelType3.asp?class_id=2

Then you can look up parts numbers at this site in the Parts section or try www.boatfix.com

As far as the holes you have circled in red in the pics, they are "cavity drains" which will allow water to drain out of the "free flood" areas of the lower unit. You need these drains, otherwise water would be entrapped in various cavities at the top of the lower unit and it could freeze over the winter, damaging the gearcase.

These holes are totally outside the oil-containing parts of the gearcase and you shouldn't worry about them unless they are plugged-up with debris.

Check out this old post which contains some good general information on changing out your gear oil:

http://forums.iboats.com/showthread.php?t=259698&highlight=gear+oil

HTH.........ed

 

[smokeyblaze]

Re: How to add lower unit gear oil

88 bucks for a gasket set..I just need ti know what kind of gasket I need for the drain plug/screw my serial number is 5034003. I guess I can just use teflon tape?

 

[gss036]

Re: How to add lower unit gear oil

Any boat shop will have them, usually in a 2 pack. I made the ,istake of buying from the Yamaha dealer, they soaked me a buck apiece for them.

 

[Moody Blue]

Re: How to add lower unit gear oil

Don't use teflon tape. Its not the threads that provide the seal, it is a compression type seal between the head of the screw and the face of the screw hole.

I have started using o-rings in place of the usual flat fiber washer. I find I can re-use the o-rings while the fiber washers are a one shot deal.

As mentioned, you should be able to locate those drain plug gaskets at any marine supply shop. I used to pay about $1.00 ea also.

 

[smokeyblaze]

new topic on this