Die Size for 1969 Ariens Drain Plug - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 01-29-2016, 05:03 PM Thread Starter
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Question Die Size for 1969 Ariens Drain Plug

Hello Guys,

I am changing the gear case oil on my í69 Ariens and Iíve noticed that the drain plug threads need some dressing up.

I believe the drain plug and fill plugs are interchangeable and I know they are listed in the Ariens Parts and Repair Manuals as Part No. 1138 Pipe Plug 3/8 Sq. Hd. but does anyone know the correct thread size for a die that can be used to clean up these threads. Iím guessing this plug uses a NC thread of some size.

I have a fairly extensive tap and die kit but none of the dies seem to fit this size bolt as most of them are for smaller bolts.

So far, our greatest single snowfall in Hamilton, Ontario is about 2 inches. We usually get 2 to 3 whopper storms per year but so far nothing.

Thanks!

1969 Ariens Model No. 10962 Serial No. 000971 with H70-130067 and RATO 212cc OHV Engines

1973 Ariens Model No. 910006 Serial No. 009643 with H60-75362J Engine
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post #2 of 14 Old 01-29-2016, 05:39 PM
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I'm not in at my garage, but I'm 95% sure its a 3/8 NPT, National tapered pipe thread. Pipe threads will not usually be in a standard tapp and die set. Before running to the hardware store, try to clean out the male threads with a dental pick. It might just be pipe sealant or semi solidified oil. Post a small photo if you can.
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post #3 of 14 Old 01-29-2016, 05:41 PM
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I thought most engine manufacturers used a tapered National Plumbing Thread (NPT) for their drain plugs.
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post #4 of 14 Old 01-29-2016, 06:02 PM
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+3 on the tapered pipe threads
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post #5 of 14 Old 01-29-2016, 07:09 PM
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Just to clarify, the '3/8' has only a distant relationship to the diameters you see on the thread. The threads are larger diameter than 3/8"
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post #6 of 14 Old 01-29-2016, 07:53 PM
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You have me curious: why do you want to chase the threads, what's wrong with them? Being a tapered tap (if NPT, which is very likely), you can't just keep threading the tap in as far as you want, then back it out. The further you turn it, the deeper it will cut the threads.

Also, it's hardly "breaking news" (), but using a tap will generate metal chips. Unless you can guarantee that you can flush them all out of the gearbox, you might just make things worse. If you have the gearbox disassembled, of course, cleaning them out is one thing. But if it's still assembled, and you might leave chips floating around in there, you could do more harm than good.

Could you just clean the threads with a pick, as suggested, then maybe add some pipe thread sealant goop to the threads when reinstalling the plug, to help seal any possible leaks?

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post #7 of 14 Old 01-29-2016, 08:30 PM
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I would say the threads are 1/4" NPT which measure close to 3/8" outside diameter and if you coat the tap with grease, it will capture most if not all of the chips. A few small aluminum shavings floating around won't destroy the motor.

Never mind.............I should have engaged my brain before putting my mouth in gear. Die instead of tap - sorry.

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Last edited by Grunt; 01-29-2016 at 11:53 PM.
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post #8 of 14 Old 01-29-2016, 09:12 PM
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Just bring a plug to your local hardware store or home center and match it up. The plumbing section should have them. I wouldn't mess around with a die when new plugs are around $1.00.
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post #9 of 14 Old 01-29-2016, 09:56 PM
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Yeah, sorry, I just realized you said you're referring to the plug itself, and you did mention a die, not a tap. My apologies, I thought you wanted to clean up the female threads on the gearbox, not the male threads on the plug. So ignore my comment about leaving chips. You could clean any chips off the plug easily.

But I'd still lean towards just buying a new plug, vs using a die, if it were me. Heck, a new die is probably more expensive than a new plug. I've replaced the plug on at least one of my machines, the hardware store had what I needed, inexpensively. I'd bring the plug to the store and use that to help make sure you get the correct thread size.

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post #10 of 14 Old 01-29-2016, 10:05 PM
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Garage
Hardware store or a big box store should have that plug for a buck or three. Sooooo much easier.

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Make sure the windows are up before the snow plow goes by !!

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