Reinstalling an Engine that Fell Off a Snowblower

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Today we'll be reinstalling an engine that fell off a snow blower.

We'll be using Reversible Lock Nuts instead of the factory nuts and bolts that used lock washers.

The issue with lock washers is, in the event that the nut backs away from the lock washer, the lock washer no longer functions. Once this happens, the nut can loosen itself off, to the point where it falls off the threads of the bolt completely.

A reversible (or reverse) lock nut has an indent on the outside of the face, which slightly deforms the threads at the center of the nut. This allows the nut to be installed from either side.

Reversible lock nuts provide "prevailing torque" which means the lock nut creates friction between the threads of the nut and the bolt or stud treads, which in turn increase the force needed to tighten, as well as loosen the nut.

Another form of a prevailing torque lock nut, is the Nylock (nylon lock nut) nut that I showed in the video. The nylon insert has a smaller diameter than the opening of the nut, allowing the threads of the bolt or stud to dig into it. It is not recommended to reuse these types of lock nuts.

Additionally, there is also a Stover Lock Nut, which have a conical (dome) top and a flat bottom surface, featuring chamfered corners. The locking action, created by distortion of their top threads, is said to be capable of withstanding severe vibration and shock loads, similar to the reverse lock nut. However, unlike the reverse lock nuts, the stover type lock nuts can only be installed in 1 direction.

A "surface bearing" or "surface tension" locking mechanism would be a "serrated flange" or K-lock style nut (used to hold a Tecumseh carburetor onto the intake manifold), or a typical lock washer. This is essentially a washer that deforms under the pressure of the fastener.

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The issue with lock washers is, in the event that the nut backs away from the lock washer, the lock washer no longer functions. Once this happens, the nut can loosen itself off, to the point where it falls off the threads of the bolt completely.

A reversible (or reverse) lock nut has an indent on the outside of the face, which slightly deforms the threads at the center of the nut. This allows the nut to be installed from either side.

Reversible lock nuts provide "prevailing torque" which means the lock nut creates friction between the threads of the nut and the bolt or stud treads, which in turn increase the force needed to tighten, as well as loosen the nut.

Another form of a prevailing torque lock nut, is the Nylock (nylon lock nut) nut that I showed in the video. The nylon insert has a smaller diameter than the opening of the nut, allowing the threads of the bolt or stud to dig into it. It is not recommended to reuse these types of lock nuts.

Additionally, there is also a Stover Lock Nut, which have a conical (dome) top and a flat bottom surface, featuring chamfered corners. The locking action, created by distortion of their top threads, is said to be capable of withstanding severe vibration and shock loads, similar to the reverse lock nut. However, unlike the reverse lock nuts, the stover type lock nuts can only be installed in 1 direction.

A "surface bearing" or "surface tension" locking mechanism would be a "serrated flange" or K-lock style nut (used to hold a Tecumseh carburetor onto the intake manifold), or a typical lock washer. This is essentially a washer that deforms under the pressure of the fastener.

[JamesNickersonThePhotoShopGuru]

As always, I am smarter ow that I have viewed this video 👍🏻👍🏻🙏🏻 thank you for sharing 👍🏻👍🏻🙏🏻

[TheShadeTreeFixitMan]

Good job and clear explanations as always. Thanks

[gravelyman]

I use lock washers all the time but I like your idea of using lock nuts. Some people reuse lock washers that result in problems also. As usual great video and Thanks for sharing this video my friend 🔧👍

[Turningwrenches]

I love the idea of the reverse lock nuts hopefully it serve your customer to years to come . Great explanation of what hardware to use.

[rogermcdonald]

Jake, that customer was lucky it didn't do more damage than it did. He should be good now with those lock nuts. Problem solved! 🇨🇦🇺🇸👍

[ChubbyButcher]

WOW! Interesting video.. thanks EP FOR GIVING US THE KNOWLEDGE WE NEED! .. I only deal with tecumseh old school machines BEASTS.. THIS VIDEO WILL COME IN HANDY . THANKS

[Samlol_drrich]

My auger came out as I was using my snowblower. It spun right out and continued to roll down the block. Haven't seen it since.

Great video

[donvoll]

Good day Yea I guess a person should every once in awhile. Thanks

[robertmailhos]

I've fallen and get up.🤣 All jokes aside the those locking nuts are a great idea for this matter I've had a issue with the engine on my snapper rear engine rider only had 1 or 2 bolts holding it to the frame

[TheShadeTreeFixitMan]

"Later time" means disaster. Been there and done that for a different issue.

[nurseratchet]

Huh, you don’t see that everyday. Very interesting video. How old is that machine? 1979? I will have to try those reverse lock nuts. Nice tip. 👍

[berardia]

Nice explanation on which nuts to use. I recently came across some nuts that had that round indent in the side and they would only go on 1/2 way easily. I was thinking they may have a special thread.

[Rein_Ciarfella]

Pretty lucky that engine didn’t destroy everything bolted to it when it committed seppuku. Great to learn about a type of fastener I’ve never heard about before. I probably would have used nylocs or double-nutted them with threadlocker before seeing those nuts. What kind of skids does that machine have and are they adjustable? 10/32! That’s huge for a homeowner, isn’t it? Does it have a differential?

[chrisevil]

Great video, and great solution for the problem! i have a few lock washers on two seperate snowblowers, one tecumseh and one briggs, but the lock washers are sure to cause a problem later as things loosen with the normal vibration of service. great idea with the reverse locknuts, those will definitely stand the test of time a lot better. your customer will be stoked he only has to turn the engine over a quarter turn to get er started!

[alfries]

Great video. You did a great job for your customer. That machine is a top of the line machine. I was looking for Zerk fittings and was not dissapointed ! If I owned it I'd clean it up and wax it at the end of the season. Snowblowers are life saving tools. My 10 horse still looks brand new and it's the better part of 30 years old. Updated the belts and did a carb clean/rebuild. Every year I get 5 gallons of frsh fuel and use Sta-Bil Marine fuel stabilizer. A wash and wax is next? I wonder if your customers would pay for a minor detailing of their machine ?

[motorcoachtech]

Jake I’m surprised it didn’t have dual belts on the auger drive. Not sure what year MTD started using them on units that are 7hp and up. I have in a pinch made lock nuts by giving a squeeze in the vice to distort them slightly. Thanks. Rick

[kenhilson]

I've found some blowers with thin small spring washer on chassis to grab and hod bolts from falling down. I assumed they were for fast factory engine mounting

[mikespain]

Two other options are: red Loctite, or two nuts tightened together (jamb nuts).

[kjell-richardlvdal]

Do the reverse lock nut Have a DIN number
Like DIN 985 NYLOCK NUT