Engine Removal and Inspection
Remove the engine from the vehicle. When removing the
engine take note as to which engine mount screw the
yellow starting system ground wire is attached to. It will
be important to re-attach the ground wire in the same
position when re-installing your new engine.
Remove clutch, air filter, tuned pipe and starter assembly.
Save all of these original Traxxas parts as most of them
will be used later.
This would be a perfect time to inspect the condition of
your clutch bell bearings, clutch shoes and clutch spring.
If the bearings are gritty feeling, they can cause your new
engine to perform poorly and suffer from an inconsistent
and unreliable idle. A clutch and bearings that are worn
is the number one reason for an engine that does not
operate at its highest potential on a consistent and
reliable basis.
If the clutch shoes are worn, glazed over or have the
pivot pin holes elongated replace them along with the
clutch spring at this time.
Dynamite offers replacement bearings (DYN3223) and
clutch shoes with spring (DYNP5184).
Replace the air filter element at this time also.
Replacement Engine Preparation
Install clutch
Use the original Traxxas tapered collet, flywheel, and
clutch bell. Use the clutch nut that has been included
with your new engine for reassembly. If needed use fresh
clutch shoes, clutch spring and bearings.
Assemble the clutch system onto the engine in the order
shown in image #1. The order of assembly goes in this
order:
1. Tapered collet
2. Flywheel
3. Clutch nut
4. Clutch shoes and spring (take note as to the
orientation of the clutch shoes when installed
onto the flywheel. See Image 2)
5. 5 x 7 washer
6. Clutch bell and bearings
7. 5 x 7 washer
8. 3 x 6 button head screw.
Final end play for the clutch bell is adjusted with the 5
x 7 shims. Use enough shims to allow approximately
.5mm of endplay on the clutch bell. If the endplay is
larger than .5mm add 5X7 washers to the outside of the
clutch bell in order to remove excess play. When the
assembly is finished the clutch bell should be able to
spin freely with no drag. If there is excess drag, check
the clutch bell bearings for smooth operation or remove
a shim from behind the 3 x 6 button head screw.
Install the exhaust system
If your vehicle is supplied with a bolt on style exhaust
manifold, use the supplied O-ring seal (DYN0719) “C”
shaped manifold adaptor and retaining spring. When
using the “C” shaped manifold adaptor, be sure the
ends of the retaining spring are positioned into the area
previously occupied but the mounting screws that were
removed earlier.
If your vehicle is supplied with a spring retention style
manifold, use the supplied O-ring seal (DYN0719) along
with the manifold gasket (DYNP5528) and retention
spring.
Install starting system
Install the starting system using the three 3 x 12 Traxxas
button head screws.
Attach air filter
Install the Traxxas air filter onto the DYN engine using a
wire tie. A new filter element should be used. Make sure
the air filter assembly is attached securely. Loss of the air
filter will shorten the engine’s life dramatically.
Re-install the engine
Using the reverse order of removal, re-install the engine
into the vehicle. Use the supplied 3 x 10 cap screws to
attach the engine the mounts. Don’t forget to re-attach
the yellow ground wire in the same position when
re-installing your new engine. It is highly recommended
to use a medium strength threadlocking compound on
the engine mounting screws.
In order to set the gear mesh properly, place a small
strip of paper or poly bag between the clutch bell and
spur gear. Force the two gears together and tighten the
motor mount screws securely. Remove the paper/poly
bag. Your gear mesh should have just a slight amount of
play without being too loose or too tight. Spin the drive
wheels on the vehicle. If the gear mesh binds or makes
a whining sound, the mesh is too tight. Simply loosen
the motor screws and re-try with a different amount of
pressure. This process offers a perfect quiet gear mesh.
Re-attach the starter motor wires
In order to attach the blue remote glow driver wire to
the glow plug, it may be necessary to open up the end
of the remote glow driver’s lead wire with a pair of small
needle nose pliers. Some Traxxas vehicles are equipped
with a glow plug lead that is replaceable. If your vehicle
has a glow plug lead that is replaceable an option here
is to install the Dynamite Head Lock Glow Plug Lead
(DYN7682).
To finish this part of the installation, tuck the glow plug
lead wire down into the open fin on the cooling head for
protection.
Your engine is now ready to start and begin the break-in
procedure.
Follow the break in and tuning procedures outlined in the
universal engine guide included with your engine.
For maximum performance of your engine we highly
recommend the use of Dynamite inline exhaust
systems (DYN6628, DYN6629 and DYN6630),
air filters(DYN2612) and Max-Life
™
clutch shoes
(DYNP5184).
Image 2
Image 1
Completed Clutch Assembly
