[xj40] Replacing the Fan Clutch '88 XJ40

WOW, thats a lot easier than on the '82 XJ6. I had to remove the hood
on the XJ6 to do it easily, if you can call that doing it easily.

But now a question for the real techies:

The fan on the XJ6 and V12 XJS is identical to the '88 XJ40…well,
almost…the XJ40 blades are about 1/4" longer than the fan on the
XJ6 and XJS. Other than that they appear to be identical.

Is the 1/4" difference enough to cause a problem? No, I dont think an
XJ40 fan would fit inside an XJ6 shroud, but I mean could an XJ6 fan
be kept as a spare for the XJS, XJ6 and XJ40? Reduced load on the
engine, reduced noise from the fan and, unfortunately…probably
reduced air flow. But reduced air flow may not be a problem anyway as
the clutch is usually doing that anyway.

I noticed that the old fan I had had had (wow thats a mouthful) three
cracks in the plastic that I had welded with JB Weld. I have never
known if there is any connection between the hairline cracks and the
“exploded” fans that I have heard about. Though I have never
experienced an exploding fan and I have been on the race track with
the XJ6 at WOT and the fan had cracks in the plastic so I am not
entirely convinced that they do explode. I would think that if a
crack opened up enough the metal would spin inside the plastic due to
lack of tension, and would not explode.–
Jim Isbell
“If you are not living on the edge, well then,
you are just taking up too much space.”

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !

In reply to a message from Jim Isbell, W5JAI sent Sat 15 Jul 2006:

Jim:
I never had a fan explode, but I’ve had a fan lose a blade at
about 3,000 rpm. As it happened, it was a Sunday, I was about to
leave Virginia on Interstate 81, with a deadline to be in Houston
Texas Monday morning. The cell phone said I was in ‘‘No Service’’
Virginia.
I heard the blade leave the engine compartment out the bottom.
No abnormal conditions on the gauges, so I hobbled to the next rest
stop. Sure enough, there was a blade entirely gone, broken at the
hub. There was no other damage.
These fans have eleven asymmetrical blades, and when a blade is
missing, it shakes the whole car. I needed to press on, so
I ‘eyeballed’ the opposite side of the fan and removed half each of
two adjacent blades, fired her up and was back on the road again.
Made it to Houston and back with no further incident. A new white
fan was waiting for me when I got back.
I know I was lucky. It generally takes out the radiator when a
blade comes off.–
The original message included these comments:

I noticed that the old fan I had had had (wow thats a mouthful) three
cracks in the plastic that I had welded with JB Weld. I have never
known if there is any connection between the hairline cracks and the
‘‘exploded’’ fans that I have heard about. Though I have never
experienced an exploding fan and I have been on the race track with
the XJ6 at WOT and the fan had cracks in the plastic so I am not
entirely convinced that they do explode. I would think that if a
crack opened up enough the metal would spin inside the plastic due to
lack of tension, and would not explode.


Pete 70 XKE (193K) 88 XJ6 (233K) 88 XJ6 (217K) 60 Mini
Severna park, Maryland, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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Hi,
I was looking for a clutch for my SII Daimler Double Six VdP and a guy at
the breakers brought out a black plastic fan and clutch from, well… I
think he said, “An AJ16 engine.” I don’t know which model Jag or what
year, but he said it would fit in place of my old metal fan and clutch. It
did - perfectly. Diameter was the same, no mods to the shroud needed.

Anyway, I had no problem fitting it (except for having to turn each of the
four bolts half a turn at a time) and it works perfectly - more powerful
than the old metal fan and quieter. On the page in the link below are pics
comparing the two assemblies. Just click on the thumbnails for larger
photos. Note the width of the plastic blades to the metal ones!

http://www.pclarkson.plus.com/pages/modifications%20gallery.htm

Regards,
Paul.

Paul’s Daimler Diary:-
http://www.pclarkson.plus.com/

-----Original Message-----
From: owner-xj40@jag-lovers.org [mailto:owner-xj40@jag-lovers.org]On
Behalf Of Jim Isbell, W5JAI
Sent: 15 July 2006 19:49
To: List for XJ40
Subject: [xj40] Replacing the Fan Clutch '88 XJ40

WOW, thats a lot easier than on the '82 XJ6. I had to remove the hood
on the XJ6 to do it easily, if you can call that doing it easily.

But now a question for the real techies:

The fan on the XJ6 and V12 XJS is identical to the '88 XJ40…well,
almost…the XJ40 blades are about 1/4" longer than the fan on the
XJ6 and XJS. Other than that they appear to be identical.

Is the 1/4" difference enough to cause a problem? No, I dont think an
XJ40 fan would fit inside an XJ6 shroud, but I mean could an XJ6 fan
be kept as a spare for the XJS, XJ6 and XJ40? Reduced load on the
engine, reduced noise from the fan and, unfortunately…probably
reduced air flow. But reduced air flow may not be a problem anyway as
the clutch is usually doing that anyway.

Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !