O-rings on lower end fill and vent screws?

crunch

Commander
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Aug 1, 2006
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Napa gave me O-rings instead of gaskets (gaskets are what came out of it).... will O-rings work?

Thanx.
 

crunch

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Re: O-rings on lower end fill and vent screws?

Thanx Vlad, I kinda thought they would, but didn't want to change oil twice :)
 

timmathis

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Apr 24, 2005
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Re: O-rings on lower end fill and vent screws?

NAPA sold you the right ones. Better safe than sorry...
 

twocycle

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Aug 19, 2006
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Re: O-rings on lower end fill and vent screws?

Whao dude! O Rings will not work correctly if yours takes gaskets. The way to tell is to look at the underneath side of the screw heads and if they're flat then use gaskets, if they're grooved then use O Rings. That's the problem when you go to some place that's not familiar with what they're selling parts for - they don't know anymore than what a freakin' book tells them cuz they don't have the experience. Unless the customer is sure what to get or what it is they need best go to a dealer than is familiar with the product. After over 35 years in this business as a marine tech and shop owner I can tell you a few stories!

Happy boating.
John
Owner/Operator
UB&M
 

lisfisher

Petty Officer 2nd Class
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Apr 27, 2006
Messages
139
Re: O-rings on lower end fill and vent screws?

what is the make and serial number of your engine?
 

crunch

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Re: O-rings on lower end fill and vent screws?

1978 Merc 800 SN 4835014.... and there were no grooves on the screws :'(
 

lisfisher

Petty Officer 2nd Class
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Apr 27, 2006
Messages
139
Re: O-rings on lower end fill and vent screws?

having trouble with your serial number....what horsepower is it??
 

emckelvy

Commander
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Jan 16, 2004
Messages
2,506
Re: O-rings on lower end fill and vent screws?

Your motor does not take O-rings stock, unless someone has changed the drain/vent plugs and I doubt that very much.

The correct gaskets for your application are either Sierra P/N 18-2945, or Mercury P/N 12-19183-3, at around $.70 each for the Merc part.

Your local Napa should be able to get the Sierra part for you.

HTH..........ed
 

timmathis

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Apr 24, 2005
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1,295
Re: O-rings on lower end fill and vent screws?

They are right if it was made for o rings. o rings or gaskets will work. But if it is made for gaskets it needs gaskets. It depends like said above what type screws you have.
 

crunch

Commander
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Aug 1, 2006
Messages
2,844
Re: O-rings on lower end fill and vent screws?

Thanx guys, I'll take the vent screw down to Napa again and see if they have the gaskets in stock, if not I've written down the part #s d:)
 
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