Car Help: Uninstalling and Reinstalling Crankshaft Pulley and Bolt
When do you need to replace the crankshaft pulley of your vehicle? That is when it is already bent or cracked. If that happens, and you are unable to fix the problem early on, both the engine and the transmission systems will fair badly. Unfortunately, many car owners find this task to be among the hardest part of car maintenance and repair, particularly the removal of the crankshaft pulley bolt because of its unusually high torque specification. Add to that the fact that different car makes and engine specifications require differing ways to effectively unbolt the pulley.
Difficulty Level: Difficult
What you'll need:
- Deep socket
- Air or electric impact gun
- Electric impact wrench
- Big compressor
- Air hammer
- Claw hammer
Step 1: Let the engine cool down. This is particularly important for your safety, because you will be working with the engine itself. And of course, it is more convenient working with cooled engine. Pop the hood open already to let the unwanted heat dissipate faster.
Step 2: When all of the under-the-hood components have cooled down already, prevent the flywheel from moving by locking it in place. Also hold the crankshaft firmly stable by shifting to fourth gear.
Step 3: Take out the bolt and washer from the center of the crankshaft pulley. Now, that is where the hardest part comes. The surface textures of the bolt's threads and of the receiving hole form an embedment, making the bolt really hard to remove.
Step 4: Place an electric impact wrench on the bolt with the handle positioned against the frame. After making sure that it holds really steady, start the engine. This should break the bolt loose. Note, however, that such a technique will work only with clockwise engines, not the other way around.
How do you know if your engine running is clockwise or counter-clockwise? Viewing from the driver's seat of left hand-drive vehicles, the engine turns counter-clockwise when the timing belt end is towards the driver's side. If it turns towards the passenger side, the engine is clockwise.
Step 5:If the bolt does not go off, you may opt for an air impact wrench that is backed-up with a big compressor. If it fails, blow the crankshaft pulley bolt with air hammer in order to break any seal that holds the bolt tight to the receiving hole. When you are using a claw hammer, make sure to hit the right part.
Step 6: When the bolt and washer are out, use a puller to remove the pulley. Do not pry off to avoid damage with the crankcase.
Step 7: Install a new engine breast plate first before mounting the replacement crankshaft pulley. Make sure to also coat the oil return thread of the pulley hub with grease after it has been cleaned. Properly seat the key on the crankshaft, and line it up with the pulley keyways.
Step 8: Mount the pulley by sliding it to the crankshaft. And then, secure it by inserting the bolt into the receiving hole at the end of the crankshaft. Tighten the bolt with a socket, and torque it to 35 lb.-ft.