104 teeth is for the saloon… 133 is for the XK (car)… There are two
sizes (diameters) of starter drive gears (large teeth and small teeth) AND
two different numbers of teeth (nine and ten)…
Look on the edge of the flywheel you have… somewhere on the
perimeter is a stamped number (C.XXXX)… This is the part number,
and can be used to determine it’s original fitment…
That said, the XK and Saloon flywheels can be interchanged, as long as the
proper mated starter follows the flywheel.
Starters have part numbers, as well… Pretty certain the Bendix is
stamped with a number, as well… Simple matter of checking to see which
mates with what…
I have not a clue about these gear-reduction jobs… they defy
convention…
Anytime a flywheel is changed or it’s face is resurfaced, it MUST be
balanced WITH the Crankshaft… No if’s ands or buts!!
Charles #677556.----- Original Message -----
From: “jagbucket”
the flywheel installed on the new to me mk v11 3.4L.
has 133 teeth. Is this correct? or should it be 104 teeth?
the starter pinion has ten teeth @ 30mm diameter although
this starter came with the motor it was not installed and i
do not know if this is indeed the correct starter. So if
not the right flywheel do I need to worry about balance
issues and the possibility of different dia.
This all came to light when buying a new gear reduction
starter based on the flywheel and starter info I gave not
knowing at the time that there were different teeth counts
available .
The old starter (rebuilt)on a 67 4.2 has 9 teeth with
also 133 tooth ring. possibly the cause for the ring gear
failure. should that have been a 10 tooth on the pinion?
The ring gear on the 3.4 is perfect so what ever starter was
used was right but I did not get the original bel/trans and
questionable about the origins of the starter given.
the flywheel installed on the new to me mk v11 3.4L.
has 133 teeth. Is this correct? or should it be 104 teeth?
the starter pinion has ten teeth @ 30mm diameter although
this starter came with the motor it was not installed and i
do not know if this is indeed the correct starter. So if
not the right flywheel do I need to worry about balance
issues and the possibility of different dia.
This all came to light when buying a new gear reduction
starter based on the flywheel and starter info I gave not
knowing at the time that there were different teeth counts
available .
The old starter (rebuilt)on a 67 4.2 has 9 teeth with
also 133 tooth ring. possibly the cause for the ring gear
failure. should that have been a 10 tooth on the pinion?
The ring gear on the 3.4 is perfect so what ever starter was
used was right but I did not get the original bel/trans and
questionable about the origins of the starter given.
Thanks all for reading this and your opinions–
jagbucket
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
Mike;
My notes (for an XK120 and MK VII Saloon)
show (for the XK120) a 131 Tooth Ring Gear with a
Ten Tooth Starter Gear (fine teeth-- as opposed to the ten
coarse tooth Bendix that was available at the time.
Another note card simply lists “Flywheel-132 teeth,
Bendix-- 10 teeth”. On the back of the card I list:
“9 tooth Large Hole 250698” and “9 tooth Small Hole
291562” with no other explanation. Numbers are probably part #'s.
A third note card has: “Jag Saloon Flywheel 104 teeth”
with two part numbers C.12114 HT (pretty certain that is
for a 4.2L XJ-6 Saloon w/automatic) and C.4809. This latter
is a Jag MK VII Saloon AND an XK120 Part Number (fitted to
XK120 Engine #'s W.2646 to W.8274)…
A fourth note card has the following:
MK Saloon.
Lucas 26140A for 104T (tooth) Flywheel 10T Coarse Gear.
XK 120.
Lucas 26062A for 132T Flywheel 10T Fine Gear Bendix.
These notes were made a few decades ago and probably adds
more confusion than answering any questions…
Your comment about the Pressure Plate being “proud by about 3/32 to the
wheel this for 1/2” and then steps up to the ring gear id…"
is disconcerting… If I understand correctly, the “face” of the flywheel
is “lipped”… that is, the area where the clutch disk would contact is inset
while the area the PPlate bolts is raised by 3/32"… If this is correct,
then your flywheel is forty pounds of scrap steel! I hope I
misunderstood your description…
Yes, the “2 57” and “10 53” are dates those units were built. They
would be installed on Jags with Build Dates about three months later.
Charles #677556.----- Original Message -----
From: “jagbucket”
Thanks Charles
So I confidentially when out to find said #s. It appears
that the ring gear on the 3.4 is perfect because it has been
replaced and the area that used to have timing marks and #s
have been machined… at lest someone center punched what i
think is tdc. they took quite a bit off so much so that the
pressure plate is proud by about 3/32 to the wheel this for
1/2’’ and then steps up to the ring gear id. removing all
factory markings
the starters have the same stampings 26062A M45G CG49
except for 2 57 and 10 53 on the other. Dates ?
If you could clear me on the relationship between ring gear
teeth count and bendix count, are there just two
combinations Ie. 133 wheel/10 bendix or 104 wheel/9 tooth
In reply to a message from Bishop-13 sent Tue 3 Apr 2012:
Thanks Charles
So I confidentially when out to find said #s. It appears
that the ring gear on the 3.4 is perfect because it has been
replaced and the area that used to have timing marks and #s
have been machined… at lest someone center punched what i
think is tdc. they took quite a bit off so much so that the
pressure plate is proud by about 3/32 to the wheel this for
1/2’’ and then steps up to the ring gear id. removing all
factory markings
the starters have the same stampings 26062A M45G CG49
except for 2 57 and 10 53 on the other. Dates ?
If you could clear me on the relationship between ring gear
teeth count and bendix count, are there just two
combinations Ie. 133 wheel/10 bendix or 104 wheel/9 tooth–
The original message included these comments:
Look on the edge of the flywheel you have… somewhere on the
perimeter is a stamped number (C.XXXX)… This is the part number,
Starters have part numbers, as well… Pretty certain the Bendix is
stamped with a number, as well… Simple matter of checking to see which
In reply to a message from jagbucket sent Tue 3 Apr 2012:
Mike,
No, a 133 tooth flywheel is not correct for a MK VII, it is
from a later engine. The starters are not interchangeable.
Your focus needs to be on the bellhousing and gearbox you
will be mating to the engine. The bellhousing, specifically
the angle of the starter mount, dictates the type of
starter. This in turn dictates the flywheel and the number
of teeth.
Paul–
The original message included these comments:
the flywheel installed on the new to me mk v11 3.4L.
has 133 teeth. Is this correct? or should it be 104 teeth?
the starter pinion has ten teeth @ 30mm diameter although
this starter came with the motor it was not installed and i
do not know if this is indeed the correct starter. So if
not the right flywheel do I need to worry about balance
issues and the possibility of different dia.
This all came to light when buying a new gear reduction
In reply to a message from PS sent Wed 4 Apr 2012:
thanks for the answers
the part of the flywheel that is machined is only the outer
perimeter that the ring is installed on, but in so doing the
part #s and timing marks are gone. perhaps this was done to
compensate for the weight of the new ring gear a ‘‘swag’’ on
my part. this is about a 1/2’’ wide cut, then steps up to the
original dia or at lest enough to install the fine tooth
ring gear.
the flywheel-bellhousing-starter relationship is very
confusing seems that there is not a clear answer or way to
determine what is correct with the parts I have especially
considering parts are modified and not oem, until I do a
trial a error approach . I do have evidence of one
combination that did not work with the 4.2 fine tooth
flywheel chewed by a coarse 9 tooth bendix a fine mess
thanks again for your input and I will report back when i
can do some trials. this was supposed to be the simple
part. Ha–
The original message included these comments:
No, a 133 tooth flywheel is not correct for a MK VII, it is
from a later engine. The starters are not interchangeable.
Your focus needs to be on the bellhousing and gearbox you
will be mating to the engine. The bellhousing, specifically
the angle of the starter mount, dictates the type of
starter. This in turn dictates the flywheel and the number
of teeth.
In reply to a message from jagbucket sent Wed 4 Apr 2012:
Mike,
Sounds like it was bodged to fit a later starter. If you
are fitting the original MKVII gearbox, you need a 132 tooth
flywheel and the early inertia starter.
Paul–
The original message included these comments:
the part of the flywheel that is machined is only the outer
perimeter that the ring is installed on, but in so doing the
part #s and timing marks are gone. perhaps this was done to
compensate for the weight of the new ring gear a ‘‘swag’’ on
my part. this is about a 1/2’’ wide cut, then steps up to the
original dia or at lest enough to install the fine tooth