Lumina L4-151 2.5L (1991)
Figure 3 - Correct Press In Depth Of 3rd Roller Clutch Dam
NOTICE:
Measure the press in depth for the dam as shown in Figure 3. Measuring from the top of the 3rd roller clutch race to the dam will be
inaccurate because all the machining of the 3rd roller clutch race is based on the opposite side (side that mates to the input sprag). If the
dam is pressed in too far or not far enough, it could rub on the 3rd roller clutch cage or the snap ring that retains the 3rd clutch return
spring and create excess heat to distress the cage of the 3rd roller clutch.
12.
Line Pressures: Lubrication fluid is proportional with line pressures. If the line pressure is below specification, then lubrication fluid flow would
be inadequate. Check the line pressure as outlined in the service manual and reference Dealer Service Bulletin No. 90-219-7A for further details
about vacuum modulator diagnosis.
13.
Check converter clutch regulator valve for proper operation, binding, sediment or damage, etc. This valve controls the flow of lubrication - when
the torque/viscous converter clutch (TCC/VCC) is applied, mainline lubrication fluid from the pump pressure regulator is routed past the torque
converter directly to the cooler; when TCC/VCC is not applied, the fluid is routed through the converter, then to the cooler. If the valve is
damaged, a new valve is included in service package 8646934 - use only the convertor clutch regulator valve from this package.
