Today I was going to reinstall the fan and shroud after the front
crankshaft seal replacement.
Along the way, I noiced that the fan pulley and idler pulley are not
properly aligned. The fan
pulley is about 0.060" forward of the idler pulley. Since I had just
replaced the fan pulley,
I figured it might be the wrong part, so I put the old one back on to
check. It too is misaligned,
meaning that it must have been running this way for some time.
Closer examination shows that the problem is probably with the fan shaft
A brief description of what I see may help you see my problem.
It looks like there is a bearing/shaft assembly that fits into the
aluminum idler/pulley housing.
Onto the end of that shaft is pressed a flange/shaft unit to which the
attaches at the end of the shaft, and with the fan pulley mounted on
the integral flange.
The problem seems to be that the flange/shaft unit is not pressed
tightly against its shoulder.
I was about to rush off to a machine shop to have it pressed properly
against the shoulder
when I noticed that the the gap between the shoulder and the
flange/shaft unit is larger than
the pulley misalignment, measuring 0.095". So, if I press it home there
will be a 0.035"
misalignment the other way!
So the question is, is this just poor quality control at Jaguar that I
have to live with, or is there supposed to be
some other way to get these two pulleys aligned? For example, I notice a
Allen set screw
with lock nut on the idler pulley housing centered under the
bearing/shaft assembly. It must have something to do with locking
the bearing/shaft assembly to the housing. Does this offer an alignment
As you might be able to see from the above description, on my car the
mounts with a single, center bolt; I believe later models are mounted
with 4 bolts. However,
I think the rest of the assembly is the same.