1950's OMC Nylon Idle Adjust screw

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outbdnut2
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Joined: Wed Apr 27, 2016 2:46 pm

1950's OMC Nylon Idle Adjust screw

Postby outbdnut2 » Tue Jul 10, 2018 10:22 am

I have approx 20 1950 OMCs with broken, spring-loaded, minimum idle adjustment screws.

Marine Engine has a replacement (0304573) that looks like stainless for $35, and a nylon (maybe plastic) screw with spring (0437966)for $55 each....mulitplied x20, that gets expensive!

Is there any reason I can't just put a standard screw there, after filing the threaded end smooth and round? I realize I will need a screwdriver to adjust it but that's no big deal. I'm thinking that maybe stainless screws won't rust. I may need to put a nut on to tighten against the mating part to keep it from vibrating loose, even with the spring on it. or - does anyone have an inexpensive source for nylon screws that will work, even if a screwdriver or small hex wrench is needed to adjust?
Dave

FrankR
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Location: Florida

Re: 1950's OMC Nylon Idle Adjust screw

Postby FrankR » Tue Jul 10, 2018 10:38 am

A-OK with the standard stainless screw and the spring. Done it lots of times.

cajuncook1
Posts: 606
Joined: Mon Mar 09, 2015 10:05 am
Location: DFW, Texas

Re: 1950's OMC Nylon Idle Adjust screw

Postby cajuncook1 » Tue Jul 10, 2018 11:40 am

FrankR wrote:A-OK with the standard stainless screw and the spring. Done it lots of times.




Curious, what size standard stainless screw and thread count. Is it fine or course threads?

Cajun


aquasonic
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Location: Narragansett, Rhode Island

Re: 1950's OMC Nylon Idle Adjust screw

Postby aquasonic » Tue Jul 10, 2018 12:27 pm

Those screws are 1/4-20. The nylon is favored because if the motor falls or is impacted, the casting probably won't break.

There was a thread on here this past spring about these screws. I bought a bag of ten nylon thumbscrews from Grainger for under $3.00. They aren't exactly the same as factory, but a respectable replacement.

cajuncook1
Posts: 606
Joined: Mon Mar 09, 2015 10:05 am
Location: DFW, Texas

Re: 1950's OMC Nylon Idle Adjust screw

Postby cajuncook1 » Tue Jul 10, 2018 2:30 pm

aquasonic wrote:Those screws are 1/4-20. The nylon is favored because if the motor falls or is impacted, the casting probably won't break.

There was a thread on here this past spring about these screws. I bought a bag of ten nylon thumbscrews from Grainger for under $3.00. They aren't exactly the same as factory, but a respectable replacement.




Thank you kindly!!! :)


Cajun



outbdnut2
Posts: 877
Joined: Wed Apr 27, 2016 2:46 pm

Re: 1950's OMC Nylon Idle Adjust screw

Postby outbdnut2 » Tue Jul 10, 2018 3:46 pm

Thx for the info! I may go stainless, but I just had a thought and went to McMaster's website (The place to get those gas connector O-rings), and found nylon screws available in a variety of different heads. Link below is for thumb screws. Approx $10 for a bag of 100!...or for high strength Glass-filled ones at $10 for a bag of 25. I think I may opt for the high strength ones. They probably sell suitable springs too.
Dave


https://www.mcmaster.com/#nylon-screws/=1dnmcse

david bartlett
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Location: Western Maine

Re: 1950's OMC Nylon Idle Adjust screw

Postby david bartlett » Tue Jul 10, 2018 3:54 pm

I am using the glass reinforced plastic screws from McMaster Carr.

They work great.
AOMCI Member
Member Pine Tree Boating Club chapter of AOMCI

"I don't fully understand everything I know."
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aquasonic
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Joined: Tue Mar 10, 2015 7:13 pm
Location: Narragansett, Rhode Island

Re: 1950's OMC Nylon Idle Adjust screw

Postby aquasonic » Wed Jul 11, 2018 6:25 pm


outbdnut2
Posts: 877
Joined: Wed Apr 27, 2016 2:46 pm

Re: 1950's OMC Nylon Idle Adjust screw

Postby outbdnut2 » Wed Jul 11, 2018 8:12 pm

aquasonic wrote:Here is the Grainger link: https://www.grainger.com/category/thumb ... sst=subset



Thx for the Grainger info - I will be near a Grainger store next week - Opps - I just checked and of the three stores in the Minneapolis/St Paul area - none of them stock those! - darn!....thought I would avoid shipping cost.
Dave

aquasonic
Posts: 319
Joined: Tue Mar 10, 2015 7:13 pm
Location: Narragansett, Rhode Island

Re: 1950's OMC Nylon Idle Adjust screw

Postby aquasonic » Thu Jul 12, 2018 9:20 am

I usually order from my local Grainger outlet in Rhode Island. The order goes to the regional warehouse in New Jersey, and the order is in by 7:30 AM the next day. Very handy, and no shipping, just state sales tax.


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