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4LHD/4LHDX Application Manual
Powertrain Control Solutions
REV 1.1
2.1.3 Flywheel Interface
Having the torque converter correctly spaced with the transmission pump is critical for optimal functionality and to prevent
permanent damage during installation/operation. To adapt to a wide variety of ywheels and bellhousing combinations,
PCS uses Flywheel Kits (a combination of Engine Spacers and Flywheel Adapters as shown in Figure 2.1.1-3) to mate
the 4LHD/4LHDX explate/torque converter with the engine’s ywheel. These parts must not be swapped between
different Flywheel Kits. After installation of the Flywheel Kit/explate to the engine and then installation of the transmission/
bellhousing to the engine, it is necessary to verify the “Torque Converter Pull Out” which can be measured by the distance
between the torque converter pad and the explate, referenced in Figure 2.1.1-3. This measurement only works if the
torque converter has been gently pushed into the transmission pump as far as possible, which should already be the case
for proper installation referenced in section 3.1.3. If the torque converter is removed from the transmission/pump for any
reason, reinsertion of the torque convert must be done gently and precisely. There are two tabs in the transmission pump
assembly, which must be correctly aligned and integrated with the corresponding slots on the torque converter pilot. If
this is not done properly, permanent damage to the transmission will result when the engine/transmission are assembled.
Reference the PCS OEM Parts Catalog for a current list of engine and ywheel applications, and PCS engineering for
new ones.
Note: The explate kit is not included in the ywheel kit.
Figure 2.1.3-1 Example Flywheel Kit
Flexplate
Engine Spacer
Flywheel Adapter
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