One Piece Four-Speed Spacer and Seal
Five-Speed Triple Lip Transmission Oil Seal
of frustrating leaks and expensive repairs because of damaged
or worn out seals? Then you'll welcome our engineered
solution to a nagging five-speed problem - sloppy,
messy leaks caused by average oil seals. Our exclusive system is
designed around our revolutionary triple lip oil seal and
includes a tough
and powerful installation tool that when used together deliver
miles of extended service from your stock
or modified powertrain. And further proving our commitment to engineered
is our first four-speed product, a combination spacer, seal,
and installation tool. Check out the details below, then call to
sheet in our PDF library.)
for 2003 is our exclusive four-speed spacer/O-ring seal combo that,
in conjunction with our innovative and simple installation tool,
effectively cures one of the two major sources of four-speed oil
leaks around the main gear shaft. The precision ground,
coated alloy spacer features an integral O-ring that installs in
an inner groove halfway down the spacer, for superior sealing characteristics.
The red plastic tool is laid into the groove between sprocket nut
threads and sprocket splines before installation and eases the O-ring
over the spline corners and edges. We recommend easing any sharp
edges with a stone. (To insure problem free operation, pay attention
sure that the mainshaft isn't worn or damaged, and that the bushing
isn't distorted or worn. Even a small amount of play WILL leak.)
Seal Gets Major Upgrade
improved five-speed seal now features an industry exclusive hybrid
rubber/metal shell that actually
in the bore,
from popping out. The metal portion, once
properly seated using our new installation tool, locks the seal firmly
in place by grabbing the sides of the bore. Meanwhile, the rubber
coated upper portion provides superior sealing protection against
any oil that may try to work it's way around the metal sides of the
seal. Finally, we respec'd
spring for improved lip sealing characteristics. Combined with our
super tough chamfered spacer, it's a system that can't be beat
ease of installation, extended service intervals, and miles of trouble
Seals and Spacers from TwistGear
four-speed spacer and seal combo features nitrided spacer
with machined O-ring groove. Secret to installing without tearing
is the use and toss tool, top right.
tool is inserted into groove between sprocket nut thread and
splines. Ramped tool allows O-ring to slide over spline corners
without cutting. Can also be used with later model main gears
with existing O-ring for double protection.
spacer is shown ready to be installed. O-ring is secure in
machined inner groove about halfway down the spacer and is
protected from nicking while sliding over the sprocket splines
by the unique
tool just to the left of the spacer.
Five Speed Seal
five-speed seal features metal - rubber outer surface for excellent
sealing and retention in the bore. Our new tool, left, contacts
only the outer rim and presses the seal squarely into place.
five-speed seal is first assembled with TwistGear heavy duty
chamfered spacer, ready for installation over WideGear 30mm
is easy in-frame repair.
is centered in case bore, hand pressed to start into place.
Pen point indicates hybrid rubber metal composite, adapted from
technology and highly resistant to deterioration from new oil
compounds and additives.
up view of seal edge demonstrates width of lower metal locking
surface, while rubber upper surface, several thousandths wider
than metal, provides superior leak protection.
seal ready and in position, tool is ready to be placed over main
is snugged up firmly against seal, making sure both are square
to bore before pressing seal home and that transmission is locked
locking nut is threaded on. Removal sprocket can usually be hand
tightened until seal bottoms out and is felt to be fully seated.
seal is now firmly in place, without the need for staking. Leaks
are almost always the result of installation misalignment - impossible
tool. Works with OE
seals, but why would you want to when ours is this good?
Rated to Over 300 Degrees!
seals have only one or two lips, providing meager resistance to
the high temperatures generated when sand, dirt, oil, and water become
trapped between the lip and the spacer - your typically hostile
conditions. Failure occurs quickly thereafter, and with it certain
mechanical damage to the spacer. Johnson
triple lip seal overcomes OE and aftermarket limitations
by adding a third outer lip,
seen at right, that's angled outward to form a virtually
impenetrable barrier against everyday road grime and grit.
new oil seal installation tool, shown in regular length and also
available in 30mm extended version for WideGear application,
actually uses the main gear as a press, insuring smooth, secure,
square seal installation both out of and in the frame.
main function of our outer two lips is to seal off the inner lip
from dirt and debris. The inner lip actually provides most of the
oil sealing, and is very susceptible to mechanical or temperature
the outer lip and our alloy spacer (below) are chamfered for
super easy installation. Our new for '03 installation tool (left)
squarely in the bore. The
polyacrylate seal material is temperature rated to 340F, making
it well suited to the unforgiving location of the
main gear sprocket environment:
temperatures, baked in road grime, water, gas, oil, and an occasional
high temp pressure washing. You'll enjoy a lot more
time on the
road — and a lot less time in the shop waiting on expensive
order to maintain proper sealing characteristics, it's important
that the transmission fluid be maintained at proper levels. One
of the most common reasons for leaks is simply overfilling,
so watch your levels. More is definitely not better.
major upgrades to main gear design also
pay close attention to the main gear oil seal; SportGear
retainer that prevents the seal from walking or cocking in the bore,
an especially irritating source of leaks for Buells and Sportys.
Chamfered Spacer That's Space Age Tough!
unique alloy spacer's precision ground then heat treated to
.010" case depth, resulting in a service item that’s
extremely hard and durable. Unlike typical stainless steel
spacers that need constant replacing,
to grooving, wear, and the grime and acid of urban roadways. (Reusing
an OE spacer usually results in new leaks soon after service, because
tougher than stainless, hard chrome, or nickel plate, our spacer's
outer edge is specially
chamfered for easy installation. It also delivers superior lubricity
and corrosion resistance while reducing surface roughness and friction
coefficient, which allows the spacer to easily rotate
in the seal and further reduces lip temperatures and component
wear for greatly
available in a plus 30mm wider version for extended primaries, our
long version can be machined down with no loss
of superior properties for use with wide tire chain conversions.
lip oil seals and chamfered spacers are included with every TwistGear,
SportGear, and WideGear helical gear system. They are also available
individually or as kits. Ask your dealer or order direct.
and TwistGear® are trademarks of Johnson Engineering, Inc. Buell™,
Dyna™, and Sportster™ are trademarks of the Harley-Davidson
Motor Company. No affiliation with the Harley-Davidson Motor Company
is implied or inferred.