How to Replace Engine Seal
The engine is designed to have different compartments that require tight sealing to be able to optimize performance efficiency. Some are rubber seals while others are metal gaskets; each designed to handle the stresses in their respective tasks. Under normal driving conditions, these seals and gaskets can reach significant mileage. But when the stress is too overwhelming, they get cracked and damaged. And when they do, replacement must be given immediately. This way, further engine damage will be prevented. Replacement engine seals, such as the crankshaft front oil seal, often come in kits, having a sealant along with it.
Difficulty Level: Difficult
What you'll need:
- Flat-head screwdriver
- Universal puller
- Wooden block or large tube
- Abrasive paper
Step 1: For vehicles with manual gear box, set it to first or reverse gear, and then engage full handbrake. If not, disconnect the battery as well as the starter motor.
Step 2: Prepare the engine by loosening the alternator and removing the drive belt. Should extra room be necessitated, also remove the radiator for easier removal of crankshaft pulley andbolt. Taking them off is needed in order to gain access to the crankshaft oil seal of your engine.
Step 3: Prevent the engine from moving by jamming the flywheel ring gear with a lever or a large screwdriver in the starter aperture.
Step 4: Unscrew the pulley bolt with a socket and bar. Break it loose by giving the bar a sharp blow. Some use air impact wrench and compressor in loosening the bolt. The pulley bolt unscrews depending on how the engine rotates. With left-hand drive vehicles, the engine is counter-clockwise when the timing belt end rotates towards the driver side. Unscrew the bolt clockwise, then.
Step 5: If upon removing the bolt, you still can't undo the pulley, use a universal puller to take it off. Also remove the key fitting which seats in the grooves of the crankshaft and pulley.
Step 6: Find the outer end of the seal. To do that, you may have to remove the timing belt cover and the water pump. And if your vehicle has belt-driven overhead camshaft, you have to remove its belt and drive sprocket.
Step 7: Using a flat-head screwdriver, carefully remove the seal. Make sure to avoid scoring the seal housing.
Step 8: Ready your new engine seal kit. But before mounting the new seal, clean the housing first. If your manual recommends applying sealant, use the one that comes with the kit. After that, insert the seal into the housing. Make sure that the open side faces the engine.
Step 9: Put a wooden block or large tube against the seal, and squarely tap it with a hammer for the seal to snugly go into the housing. And then, put back the timing belt cover.
Step 10: Clean the sleeve at the back of the pulley, and fine the back that will touch with the seal using a wet abrasive paper. After cleaning the sleeve, smear it and the seal with some engine oil. Now, refit the pulley back with the key and the keyways aligned.
Step 11: Tighten the bolt to the recommended torque. And then, put everything back.