An engine flywheel is used to couple the engine to the transmission while holding the clutch assembly. When replacing a flywheel the transmission and clutch must be removed as well.
When a starter or clutch goes bad it can cause abnormal wear of the flywheel which can warrant replacement or to have the clutch surface re-machined which creates a new surface for the clutch disc to sit against.
There are two type of flywheels solid and dual mass which has a internal plate that can move independently from the main flywheel housing. This unit can cost upward of $500.00 or more while the conventional one piece units are about $120.00 (US). In most cases the transmission will need to be remove which will run between $800.00 and $1200.00 (US)
Remove flywheel mounting bolts which can be difficult because the can flywheel turn. Have a helper wear gardening gloves and hold it as you position the ratchet or wrench outward to minimize spin or use an impact wrench or flywheel holding tool (not shown).
Use a breaker bar and gently wedge it behind the flywheel and in between the engine block. While grasping the flywheel firmly jar the flywheel loose from the engine. (Note: The flywheel is heavy, so be ready.)
Inspect the flywheel's condition, hard spots are an indication of extreme use. If large cracks are present the flywheel will need replacement and will not be eligible for resurfacing.
Here is a resurfaced or new flywheel. Before installation use carburetor cleaner to clean the clutch surface thoroughly. (Note: Most automotive machine shops resurface flywheels.)
Gently mount the flywheel onto the crankshaft and install the mounting bolts by hand (Note: Flywheel bolt pattern lines up in one direction to avoid improper installation).
Tighten the flywheel mounting bolts in a star pattern to factory specification.
Two videos of a flywheel being replaced on a rear wheel and front wheel drive cars.
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