lower unit drain plug fibre washers

[piperdog]

hello,can any one tell us the size fibre washers that are needed for the lower unit,drain and level screws,,thanks tony

 

[ezeke]

Re: lower unit drain plug fibre washers

OD .53"
ID .37"
.09 thick

They are made of nylon, so should be replaced after each service.

You can buy a pack of 50 from iboats 18-42481-9.

 

[piperdog]

Re: lower unit drain plug fibre washers

thanks for the reply,re-checking it seems mine uses o ring s (OEM Part 0333572 ),can i use fibre washers instead of this ,if not any ideas of the size o ring

 

[rodbolt]

Re: lower unit drain plug fibre washers

They are made of nylon, so should be replaced after each service.
not nessasarily.
over the years there were 3 styles of drain aned vent screws.
one takes a fiber washer,one takes a nylon washer and one takes an oring.
depends on the sealing face of the plug.
flat sealing face uses fiber,a sealing face with a small upraised radius area takes nylon.
a face groove cut into the sealing face takes an oring.
failure to use the correct parts will result in leakage.

 

[ezeke]

Re: lower unit drain plug fibre washers

O-rings and flat washers are not interchangeable and never were.

Click the thumbnail please. This is cited for example to show the difference in the plugs.

A property of nylon is that it absorbs moisture and expands up to 30% by volume. After use in the gearcase, the used washer is considered unreliable for this reason.

 

[JB]

Re: lower unit drain plug fibre washers

They may look like washers but they are correctly called gaskets because their function is to seal, not necessarily cushion, the plugs.

 

[ezeke]

Re: lower unit drain plug fibre washers

FYI, the OMC service bulletin consistently refers to them as washers.

The plugs with a flat sealing face use OEM part number 0311958 which is flat and made of nylon [as shown in the service bulletin]

 

[bkwapisz]

Re: lower unit drain plug fibre washers

thanks for the reply,re-checking it seems mine uses o ring s (OEM Part 0333572 ),can i use fibre washers instead of this ,if not any ideas of the size o ring

I looked up mine and it uses the same O-Ring #. I wonder if it is special or if one from a typical o-ring service kit will fit...?

On that note, I noticed that when I winterized my new-to-me motor that there was an O-ring AND a nylon washer. No leaking, but curious nonetheless... Guess I'll have to check that out when I pull it out for the Spring.

 

[GEY203X]

Can You use a Nylon Washer and a Fibre Washer for a Better seal?