How to Install a Flexplate Perpendicularly

The flexplate in a vehicle with an automatic transmission serves the same purpose as a flywheel does in a vehicle with a standard transmission. The flexplate contains teeth around its outside diameter that the starter engages when starting the engine; it transfers power from the engine to the transmission. With a flexplate, engine revolutions are transferred to the torque converter, which is bolted to the flexplate. The flexplate must be installed perpendicular to the crankshaft; it only goes on one way.

Instructions

1

Determine which side of the flexplate goes against the crankshaft. Looking at the center of the flexplate, where the bolts go, one side is recessed. This side faces away from the crankshaft.

2

Clean the mounting flange on the crankshaft and the mounting area of the flexplate with parts cleaner and a shop rag.

3

Mount the flexplate on the crankshaft with the recessed part facing away from the crankshaft. Line up the mounting holes. You will be able to see that the flexplate is flush against the crankshaft by looking at the mounting holes.

4

Install the bolts by hand until finger tight. You must use the special flexplate bolts. These bolts have a special shoulder and a thin head. If you try to use regular bolts, the torque converter will not fit properly; the flexplate will not be held against the crankshaft properly. Damage will ensue.

5

Stick a large flat-head screwdriver through one of the slots toward the outside of the flexplate. The end of the screwdriver should rest against the engine block. This position will keep it from moving when you torque the bolts.

6

Use a torque wrench and socket to torque the bolts to the factory specification for your specific engine and transmission. Torque the bolts in a crisscross pattern, similar to how you would tighten lug nuts.