S&S Cycle 124 Twin Cam Style Assembly And Installation Instructions Manual - page 5
5
C. Modification Notes
S&S Cycle cautions against modifying these
crankcases due to the possibility of damaging or
weakening them. Modifying S&S crankcases in any
fashion voids all manufacturer warranties. Should the
customer elect to modify the crankcases regardless, it
is imperative that they and the information tag attached
to them be inspected beforehand to confirm that the
correct model, style, bore size, etc. have been
provided. The customer must confirm that crankcases
and related parts are correct before assembling them
or having them modified in any manner, and assumes
all liability for modifications.
Under no circumstance will S&S be held responsible
for expenses related to the modification of any S&S
part in the event warranty service is required. Modified
parts will not be accepted for credit or exchange. This
will apply regardless of cause or fault: customer,
retailer, manufacturer, or other.
For further information, contact S&S Technical Services
at 608-627-8324, FAX 608-627-0766 or e-mail
sstech@sscycle.com
NOTE - “Modification” includes but is not limited to
appearance changes such as painting, powdercoating,
plating, and polishing. Proper preparation for these
procedures as well as the processes themselves may
require the use of polishing compounds, chemicals or
procedures that are potentially harmful to crankcases.
CAUTION - Passages and internal cavities may become
obstructed by residues from materials used to polish,
paint, plate or powdercoat surfaces. Additionally,
surface finishing processes can damage critical
machined surfaces. Any of the above may cause
premature wear, damage or failure of other engine
components as well as the crankcases themselves.
Glass bead and polishing residues are abrasive and
can be difficult to remove from recesses and small
passages. Abrasive residues can cause oil
contamination and extensive engine damage. Engine
damage caused by powder coating, polishing, glass
bead blasting, or other modification will not be covered
under warranty.
Powder Coating - Subjecting heat-treated alloys such
as those used in S&S crankcases to excessive heat
can drastically alter their strength and their critical
properties. The degree of change depends upon the
temperatures reached and the duration of exposure.
When powder coating or otherwise processing alloy
parts, S&S exposes them to a maximum temperature
of 370°F for no longer than 20 minutes. Under no
circumstances should parts be heated past 400°F!
S&S strongly recommends trial-fitting every engine
before frame is painted or powder coated.
D. Engine to Frame Test Fit
NOTE - The engine must be fitted to the frame it is installed
into. It must rest squarely on its attachment points, and
bolted solidly to the frame without stressing the engine
case at any point. If possible, crankcase should be
positioned in motorcycle frame before assembly to check
alignment and clearances. The same clearancing and
alignment steps must be taken for assembled engines.
Performing the clearance alignment checks with a bare
case is convenient due to the reduced weight.
CAUTION - Failure to correctly mount the engine can
cause problems not covered under warranty including
but not limited to, excessive vibration, driveline mis-
alignment, and broken castings.
CAUTION - Do not carry crankcase by the studs. It
stresses the crankcase and studs in ways they are not
designed to handle. Also, it is easy to drop and damage
the case when it is carried by the studs.
1.
Test-fit instructions for Twin Cam style cases
with stock Twin Cam style engine mounts.
1. Assemble case halves using case bolts.
Tighten to snug. Torquing bolts to final
specification is not necessary.
2.
Clean frame engine mounts and carefully
remove any irregularities from mounting
surfaces. Also inspect crankcase mounting
bosses for burrs.
3. Position case in frame, check for clearance at
frame, and alignment to transmission. It is a
good idea to replace rubber engine mounts at
this time. Old mounts deform over time and
can induce unwanted stresses on the engine
case.