[E-Type] Tach generator

In reply to a message from Brandon Shriver sent Wed 29 Jul 2015:

Brandon,

I don’t have a photo I’m afraid. If you remove it from the
car you’ll see instantly what I’m referring to. A bronze
bushing is pressed into the alloy housing and the shaft
spins in it. Unfortunately it isn’t a very strong
interference fit. It’s pretty obvious when it gets pushed
back.

If you put it in a vice and spin the shaft using a power
drill, you should see voltage at the contacts. If there is,
then it either has been pushed back, or the dog is worn out
(which you can see with a mirror after removing the
generator. It’s a really common problem that has been
discussed a lot here in the past.–
Erica Madison Moss 64 3.8 OTS
Austin,TX, United States
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Thanks. So I need to remove the generator for further testing (which
I believe requires removing that cam cover, correct?)
B Shriver
XK Data - The Cars - Jaguar XK120, XK140, XK150 information, articles, photos and register Wed, Jul 29, 2015 at 1:43 PM, Erica Moss erica.m.moss@hotmail.com wrote:

In reply to a message from Brandon Shriver sent Wed 29 Jul 2015:

Brandon,

I don’t have a photo I’m afraid. If you remove it from the
car you’ll see instantly what I’m referring to. A bronze
bushing is pressed into the alloy housing and the shaft
spins in it. Unfortunately it isn’t a very strong
interference fit. It’s pretty obvious when it gets pushed
back.

If you put it in a vice and spin the shaft using a power
drill, you should see voltage at the contacts. If there is,
then it either has been pushed back, or the dog is worn out
(which you can see with a mirror after removing the
generator. It’s a really common problem that has been
discussed a lot here in the past.

Erica Madison Moss 64 3.8 OTS
Austin,TX, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–


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In reply to a message from Brandon Shriver sent Wed 29 Jul 2015:

I’m pretty sure it can come out without removing the cover
by just removing the three fasteners at the back of the head
and kind of pulling/twisting it loose. You kind of do need
to remove the cover however if you find you need to closely
inspect or service the drive dog.–
Erica Madison Moss 64 3.8 OTS
Austin,TX, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–


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In reply to a message from Brandon Shriver sent Wed 29 Jul 2015:

Nope. Leave the cam conver in place.
However you will need very thin fingers with four or five
joints in each to get at all three screws.–
The original message included these comments:

I believe requires removing that cam cover, correct?)


Chris Fell, '67 S1 2+2.
Salisbury, UK, United Kingdom
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Great, I’ll have to give this a try!
B Shriver
XK Data - The Cars - Jaguar XK120, XK140, XK150 information, articles, photos and register Wed, Jul 29, 2015 at 3:04 PM, Chris Fell chrisifell@btinternet.com wrote:

In reply to a message from Brandon Shriver sent Wed 29 Jul 2015:

Nope. Leave the cam conver in place.
However you will need very thin fingers with four or five
joints in each to get at all three screws.

The original message included these comments:

I believe requires removing that cam cover, correct?)


Chris Fell, '67 S1 2+2.
Salisbury, UK, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–


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In reply to a message from Brandon Shriver sent Wed 29 Jul 2015:

Should produce approximately 1V AC for each 100rpm.
No voltage might be a simple problem like the top connectors being
broken. There is also a plastic drive dog that connects it to the
camshaft; these can fail.
Remove it from the car; take out the 3 Allen screws.
Put it in a vice and drive it with a drill and see if it makes
volts.
If it’s stuffed, converting your tacho to run off the coil is
cheaper than a new tacho drive. Mike Eck will do this for you.
Used generators can be a good option as well.–
Andrew B. '67 S1 & S1.5 FHCs,'64 S1 OTS www.projectetype.com
Adelaide, Australia
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