I was called over to a friend’s house to see what went wrong with his clutch installation side job on his 95 Ford F150 pickup. He installed a complete clutch kit and had the flywheel resurfaced at a machine shop. The truck would move forward slightly when the clutch was let out but it was clear that it was slipping badly with all new parts.
To make a long story short I truly did get lucky on this one as the cut or resurfaced job on the face of the flywheel didn't look so good. So we pulled it off and I went and got my micrometer to measure the flywheel. The flywheel was resurfaced in excess. Meaning that the flywheel was well undersized and needed to be replaced. The vehicle owner was not notified by the machine shop and wasted a lot of time and money on his driveway clutch replacement project.
When it comes to clutches and manual transmissions there are not a lot of articles or information on the Internet about the subject overall, compared to other automotive systems. This is why I have built a complete section over at my you fix cars website that talks about manual transmissions and clutches.
This is the area that the starter drive meshes with to turn the engine over during the engine start cycle. When a grinding sound is heard when the key is turned this is the starter drive grinding away at the ring gear of the flywheel. This grinding sound is not a good thing. If this happens many times you will probably have an engine flywheel problem and replacement of just the starter will not solve it.
The engine flywheel also provides some absorption of torsional vibrations from the crankshaft. Which is a fancy way of saying that it helps smooth out the engine as it spins it further provides some inertia to help rotate the crankshaft through the four strokes of engine operation.
There is a precision bore at the center of the flywheel that holds the pilot bushing this supports the front end of the transmission input shaft and maintains proper alignment with the engine crankshaft. Sometimes the pilot bushing is a brass insert and sometimes it is a needle bearing set up instead. Excessive vibration in the drive-line can cause problems in this area.
If you need more information about engine flywheel problems you can visit my page about what to do when having automotive clutch problems. For more articles posted here on this website is next link will take you back to the online auto repair blog.