If you've owned a mower for a few years, you may find that the power or cutting-effectiveness has dropped recently, and it just isn't what it used to be. This is the case with many mowers, even the very expensive ones- eventually, deck/engine corrosion will take a toll and ruin your lawnmower.
Throwing your trusty mower out is both wasteful and heartbreaking- so why not switch up the engine to make your mower pretty much brand new again?
To answer your question on whether or not engines are interchangeable for mowers... yes- lawnmower engines are very much interchangeable and will swap with ease- however, the blades and drive systems will differ from mower to mower- this is a critical lawn mower engine point to note.
This article on lawn mower engine changing will cover everything you need to know.
This step involves performing a kind of MOT on your lawnmower, to check that everything else is in order. You'll need to check if the other mower components are in good health and are functioning as they should. You will know if anything is abnormal if you've been using your mower for a while now.
One major advantage of this is that if, in the case that your engine is in working order, you'll have spent money on a brand new deck, but still be having issues. In this case, another component of your mower will be the one with issues. Hence, we highly recommend conducting a thorough examination of everything (engine crankshafts, engine specs, standard deck specs, mower oil leaks, the source of mower oil (quality), as well as any general lawn mower engine faults). It'll save you a lot of money.
The engine is a very expensive part of your mower to replace- but you know what's even more expensive? Replacing your engine and discovering that the problem lies with the drive system instead...and then replacing that! Check out the drive system before purchasing a new engine.
A lot of the time, your engine won't have faults at all. In fact, many of these common problems occur, and there is no need for engine replacement:
There are some key things you need to check up to make sure your engine health is evaluated, to help determine whether or not replacement is necessary:
The second largest culprit is a faulty drive system. Even if your mower is self-driven, you should check this system up to make sure it's working in order. Some common drive-system problems that may occur:
Here are some key questions to help you troubleshoot any problems related to your drive system:
There are some key points to note about engine interchangeability, which we'll write below- make sure you read through them all.
All types of lawnmower decks are interchangeable- you can really just move one engine to another, and fit it into the current one. The reason why, is because generally, the engine mounting locations and points are standard for every machine. You can use any deck. However, you need to ensure the new deck is compatible and can work with the other components of your mower. This highly limits the range of other engines you can fit into your mower.
There are mainly 2 options to go for: