I have a 94 Grand Am with the 2.3 liter engine Single Overhead CAM
(vin 3, I think). I have just got over 200k miles. I think the car
sensed I was starting to lock at newer cars. Well the water pump just
I am in the process of replacing the pump. I have everthing off. The
exhaust manifold, pump housing and pump. Now the problem. I go to
mount the new pump to the timing chain housing and it won't go. It
mates up with the splines ( I had to rotate it slightly) and then it
bottums out. It needs to go in about 1/8inch farther. I have measured
the pump for the distance from the pump housing mounting flang to the
end of the splined shaft. It is about 0.925 inches. I did a depth
measurement on the female end if the idler. It is about 0.817 inches
deep. The difference is about an eight of an inch. I have got another
pump from NAPA this time, thinking it is the wrong pump. The pump
depth dimension is pretty close to the first pump.
I have looked inside the housing at the idler. I don't see anything
damaged or out of place. The snap rign is still in place. and the
idler bearing looks ok.
Important note: I checked the old pump and found that the distance
from the shaft end to the mountin face is about 1/8 shorter than the
new pump. However I can push up on the pump impellers and make up for
this difference (about 1/8"). The pump tends to spring back. Push up
I can only think of two things that may be the cause.
1. The pump is still not the right one for the car. The pump may be
different for this particular VIN. In which case I may have to go to
the dealer and check out a pump from them.
2. The idler and bearing have moved out of the housing seat by 1/8 of
an inch. If this is the case how will I reseat the bearing. The book
says I have to take the housing off and take it to get the bearing
pressed in to replace it. I hope i don't have to take the timing chain
housing off. If this is the problem then this may have been or
contributed to the demise of the pump.
Experience... Comments...ideas, please. The help is appreciated.