Setting Torque Wrench Video

Some fasteners are very particular about how tight they are. Overtightening a mower blade bolt for example could cost you an engine, too loose isn’t good either.

Using a torque wrench removes the need for guessing and this video shows you how to set  a torque wrench, use it and care for it.

Over View

You’ll find useful resources on this page, tips, links to tools, parts and supplies required to complete your repair.

A torque wrench is a specialized tool used to tighten fasteners (Nuts & bolts) to a precise factory spec setting.

Overtightening or under tightening fasteners can cause injury or component damage. When you’ve been turning wrenches for years some less critical fasteners may be tightened by feel but critical bolts such as blade bolts should be tightened to factory spec.

Each mower model will have a different spec and you’ll need to check the torque spec with your mower maker. (google has the answers)

You’ll find other uses for a torque wrench. Ever struggled to remove lug nuts? That’s because they were likely overtightened.

Before working on your mower be sure to remove the plug wire to prevent accidental starting, see “Repair Safety Video”.

Tools & Parts

To nail this procedure you may need the following tools, parts and supplies.


Torque Wrench

Teng 1/2 Torque wrench, fantastic tool I use it every day and mine is still going strong. A torque wrench is advised for tightening components such as flywheel nuts and blades. The torque spec of these components is very important. Picture links to Amazon.com

If you are considering buying a torque wrench, definitely check out my review of Teng torque wrench.


WD40

This is the first tool on the list for good reason, WD solves a ton of problems. I won't work without it, because I can't. Picture links to Amazon.com

Ratchet Tool Set

Before we can do anything, we'll need tools. I've selected this set as I own some Craftsman tools and while I have worn some out, they did do a lot of work. So I expect this set will last the occasional user quite a long time.

This set carries both metric and standard sockets and that's important, because some mowers will have both type of fastener sizes. Set includes spark plug sockets. Picture links to Amazon.com


Impact Wrench

I love DeWalt, they're make quality tools. This heavy duty but lightweight 1/2 inch impact wrench makes short work of stubborn bolts like flywheel nuts and rusty blade fasteners. Upto 700 ft lbs of torque on tap, I keep one in the trunk of our family car, makes a flat almost enjoyable. Picture links to Amazon.com

Drill/Screw Gun

I use a Dewalt screw gun (also a drill) in the workshop to speed up the process of removing engine covers, carburetor bolts, Armature bolts etc. It's a brushless motor and as tough as nails, I driven over it a few times - still works great! Batteries are interchangeable and so if you have a Dewalt product already you won't need the battery. Picture links to Amazon.com

Piston Stop Tool

Universal piston stop tool 10mm and 14mm, used to lock the crankshaft when removing and tightening the flywheel nut. Picture links to Amazon.com

Blade sharpening tool

Handy blade sharpening kit that fits to a cordless drill, includes blade balance tool. Picture links to Amazon.com

Blade holding tool

Very useful blade holding tool, used to hold the blade steady while the blade bolt is loosened and tightened. Picture links to Amazon.com

Wire brush kit

Stainless for heavy duty and brass for and brass wire brush kit for heavy duty and finer applications like electrical connections and softer metals. Picture links to Amazon.com

Wire wheel

Wire wheel and drill makes life easy and the job almost enjoyable! Picture links to Amazon.com

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Auto Technician and Writer at | Website

John Cunningham is an Automotive Technician and writer on Lawnmowerfixed.com. I've been a mechanic for over twenty years, I use my knowledge and experience to write "How to" articles that help fellow gear-heads with all aspects of mechanical repairs, from lawn mowers to classic cars.