Prop nut?

H

huntin dawg

Petty Officer 2nd Class
Joined
Nov 12, 2009
Messages
197
I have an old 7.5 HP, a 1973 I believe. I am in the process of rehabing it. The prop nut is unlike any I have seen before. It's aluminum and has a red cap integrated into it which appears to act to lock it in place as well as keep junk out of the threads.

The red cap is cracked. Is it o.k. to replace it with a regular vinyl lock nut or will corrosion be an issue using a steel nut?

Thanks.

HD
 
Texasmark

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,558
Re: Prop nut?

It's Stainless Steel, fine thread and the red stuff is the nylon locking device to keep it from backing off as a result of vibration....a locking device as you surmised.

There are numerous places to get one, local marine dealer, local mechanic that has been in business for that year and later, www shopping for stainless steel marine hardware, or just ss hardware. You might get lucky and your local FULL SERVICE hardware store may have one.

Measure the thread diameter and ask for the SAE Fine version.

HTH

Mark
 
C

crem1

Petty Officer 1st Class
Joined
Aug 30, 2005
Messages
365
Re: Prop nut?

A splined washer would not hurt either
 
H

huntin dawg

Petty Officer 2nd Class
Joined
Nov 12, 2009
Messages
197
Re: Prop nut?

Thanks Gentlemen,
I've never seen a nut like this. I know the red part is for locking but it is also a cap that covers the end of the shaft. Weird.

I can't find a replacement anywhere.

HD
 
Texasmark

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,558
Re: Prop nut?

A picture would be nice. Sounds weird speaking of the cap. Have you tried a Merc dealer?

Mark
 
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