Skip to Content

This site is an affiliate for companies including Amazon Associates and earns a commission on qualifying purchases.

How To Tell if a Snowmobile Engine Seized

How To Tell if a Snowmobile Engine Seized

If you’re a snowmobile owner, you know there’s nothing like tearing through a winter wonderland at top speed – but it’s not all rainbows and roses. Your engine can seize up or experience technical difficulties, leaving you wondering what went wrong. 

Here are some tell-tale signs that a snowmobile engine seized:

  1. The snowmobile’s engine won’t turn over.
  2. Strange noises arise from the engine bay.
  3. Smoke comes from the engine compartment.

In this post, I’ll show you how to tell if a snowmobile engine has seized and what you can do about it. Let’s get to troubleshooting!

1. The Snowmobile’s Engine Won’t Turn Over

An engine that won’t turn over is probably seized. Several things can cause this, but the most common culprit is a lack of lubrication. 

To test if your engine is turning over, you will need:

  • A voltmeter
  • A fully charged battery
  • A set of jumper cables

Once you have the proper tools, you’ll need to test a few things to determine the cause of the problem. Let’s walk through this together: 

  1. First, attach the voltmeter to the battery terminals. If the reading is below 12 volts, your battery is likely the problem. Charge it up and try again.
  1. If the voltage is reading 12V or above, attach the jumper cables to the battery terminals. Make sure that the negative end goes on the engine block and the positive clip goes to the positive terminal of the starter.
  1. Now, turn the key in the ignition and see if the engine turns over. If it does, your starter motor and engine are likely fine. Your problem is most likely in the ignition switch or wiring.
  1. However, if the starter clicks and nothing happens, you are most likely looking at a seized engine.

2. Strange Noises Arise From the Engine Bay

If your engine is making strange noises, it’s time to take a closer look. However, you should be particularly curious about grinding sounds since they usually indicate a significant issue. 

Engine noises occur when the piston connecting rod hits the crankshaft. When this happens, it’s only a matter of time before the clanking damages your engine permanently.

The best thing to do in this situation is to take your snowmobile to a mechanic and have them take a look. It may be a serious issue like a seized engine, or it could be something as simple as a loose belt.

I’ve also heard funny noises from my sled’s engine when I had a damaged heat shield. The heat shield protects your engine from excessive heat, and if it’s damaged, you’ll hear some strange noises.

Most of these issues are not DIY-friendly, so I recommend taking your snowmobile to a mechanic if you hear strange noises. They will be in a better position to diagnose and fix the issue.

3. Smoke Comes From the Engine Compartment

If you try to start your snowmobile and notice smoke coming from the engine compartment, it’s time to take it to a mechanic.

Smoke could signify many different things, but most are serious. It could be something as simple as an oil leak or something more serious like a blown piston.

You want to start troubleshooting at the starter. If this part is not doing its job, the engine won’t turn over, but it will try. This grinding action causes friction from the starter, producing heat and sometimes smoke. If you see or smell burning, your starter may have an issue. Have it inspected by a professional as soon as possible.

I have also had a coolant leak that made my engine smoke. Coolant leaks are a serious issue because they can cause your engine to overheat. If you see smoke and smell antifreeze, this is most likely the problem.

What Are the Chances of Your Sled Seizing?

The chances of your sled seizing are relatively low, but it’s still a good idea to be aware of the signs like smoking and an engine that won’t turn over. By catching the issue early, you can avoid severe damage to your engine.

Most of the time, a seized engine occurs when you have not maintained your snowmobile well. Something as simple as changing your oil can help prevent an engine seizure. You can also avoid engine seizures by using good-quality gasoline and avoiding driving in deep snow.

If you stay on top of maintenance, the chances that your engine will seize are slim. However, if you do notice any of the signs I’ve mentioned, it’s best to take your sled to a mechanic and have them take a look.

Can You Unseize a Sled Engine?

You can unseize a sled engine, but it’s not recommended. It is a complicated job that requires a lot of knowledge about engines, and it can also be unforgiving. Besides, few people have the tools needed for the job.

If you decide to try and unseize your engine, the first thing you need to do is take off the spark plugs. Once they are out, pour oil or spray WD40 into the cylinders and turn the engine over by hand. You can let the WD40 sit for a few hours before starting the engine.

If the engine still doesn’t turn over, you may need to use a breaker bar. You can manually turn the engine over by attaching the bar to the flywheel and having someone turn it.

Once the engine turns over, you can put the spark plugs back in and try to start it up. If it still doesn’t start, you may need to take it to a mechanic.

Attempting to unseize an engine is a risky proposition, and it’s often best to just take your sled to a mechanic. They will be able to diagnose and fix the issue without causing any further damage.

Final Thoughts

Sled engines can seize for several reasons, but most are preventable. By following the tips in this article, you can reduce the chances of your engine seizing and avoid costly repairs. 

Something as simple as changing your oil regularly or using good-quality gasoline can help keep your engine running smoothly. However, if you notice any strange noises or smoke coming from your engine, take it to a mechanic as soon as possible.

Recommended Reading