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Instruction Sheet #51-1127
5-08-03
Copyright®, 2003
by S&S Cycle, Inc.
All rights reserved. Printed in the U.S.A.
Because every industry has a leader
S&S Twin Cam Style Engine Case Instructions
S&S Cycle, Inc.
14025 County Highway G Box 215
Viola, Wisconsin 54664
Phone: 608-627-2080 • Fax: 608-627-1488
Technical Service Phone: 608-627-TECH (8324)
Technical Service Email: sstech@sscycle.com
Website: www.sscycle.com
For all S&S Stock Bore, 4" Bore, and 41/
8" Bore Twin Cam style engine cases
with Twin Cam style, or Evolution style engine mounting.
All S&S Twin Cam style engine cases are for use in
Type "A" style (non-counterbalanced) applications.
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SAFE INSTALLATION AND OPERATION RULES:
Before installing any S&S engine part, it is your responsibility
to read and follow all instructions. The rules below are for
your personal safety, and must be kept in mind at all times.
● Gasoline is extremely flammable and explosive under
certain conditions, and toxic when inhaled. Do not smoke
around gasoline. Perform the installation in a well-ventilated
area away from sparks or open flame.
● After installation, be sure all fuel lines are routed correctly
with clamps in place and tightened securely. Even with
protective cover, gas lines must not contact extremely hot
surfaces where they could melt or leak and catch fire.
● Compressed air and particles dislodged by
compressed air are potentially harmful. Wear protective
goggles when using compressed air and always direct
the air stream away from yourself and others nearby.
● Some solvents, degreasers and other chemicals are
harmful, especially to skin and eyes. Many chemical
compounds such as lacquer thinner are also flammable and
present a fire hazard. Read the manufacturer’s instruction
label for precautions and proper use. Use in a well ventilated
area and wear protective clothing to avoid personal injury.
● If the motorcycle has been running, wait until the engine
and exhaust pipes have cooled before performing any
mechanical work.
● Before beginning the installation, disconnect and remove
the battery to eliminate potential sparks and possible
inadvertent engagement of the electric starter while working
on the motorcycle.
● Read instructions thoroughly and carefully so all
procedures are completely understood before beginning
installation. Contact S&S if you have questions, if any steps
are unclear, or if any abnormalities occur during final
assembly, installation, or operation.
● Consult an authorized H-D service manual for correct
disassembly , reassembly, and installation procedures for any
parts that need to be removed or disassembled to facilitate
the installation.
● Use good judgment during assembly, installation, and
when operating the motorcycle. Good judgment begins with
a clear head. Don’t let alcohol, drugs, or fatigue impair
judgment. Perform installation when fresh and alert.
● For optimum performance and safety and to minimize
potential damage to the cylinder heads or other components,
use correct hardware and follow procedures outlined in S&S
instructions and authorized H-D service manual.
● Motorcycle exhaust fumes are toxic and must not be
inhaled. Run motorcycle only in a well ventilated area where
fumes can dissipate.
WARRANTY :
All S&S parts are guaranteed to the original purchaser to be
free of manufacturing defects in materials and workmanship
for a period of twelve (12) months from the date of purchase.
Merchandise that fails to conform to these conditions will be
repaired or replaced at S&S’s option if the parts are returned
to S&S by the purchaser within the 12 month warranty period
or within 10 days thereafter.
In the event warranty service is required, the original
purchaser must notify S&S of the problem immediately.
Some problems can be rectified by a telephone call and need
no further action. Apart that is suspected of being defective
must not be replaced without prior authorization from S&S. If
it is deemed necessary for S&S to make an evaluation to
determine whether the part was defective, it must be
packaged properly to avoid further damage, and be returned
prepaid to S&S with a copy of the original invoice of purchase
and a detailed letter outlining the nature of the problem, how
the part was used, and the circumstances at the time of
failure. If after an evaluation was made by S&S and the part
was found to be defective, repair, replacement, or refund will
be granted.
ADDITIONAL W ARRANTY PROVISIONS:
(1) No part shall be returned to S&S without first contacting
the company and obtaining a Return Authorization (RA)
number.
(2) S&S shall have no obligation in the event an S&S part is
modified by any other person or organization, or if another
manufacturer’s part is substituted for one provided by S&S.
(3) S&S shall have no obligation if an S&S part becomes
defective in whole or in part as a result of improper
installation, improper break-in or maintenance, improper use,
abnormal operation, or any other misuse or mistreatment.
(4) S&S shall not be liable for any consequential or incidental
damages resulting from the failure of an S&S part, the breech
of any warranties, the failure to deliver, delay in delivery,
delivery in non-conforming condition, or for any other breach
of contract or duty between S&S and a customer.
(5) S&S parts are designed exclusively for use on
motorcycles with Harley-Davidson style V-twin engines. S&S
shall have no warranty or liability obligation if an S&S part is
used in any other application.
IMPORTANT NOTICE:
Statements in this instruction sheet preceded by the
following words are of special significance:
WARNING
Means there is the possibility of injury to yourself or
others.
CAUTION
Means there is the possibility of damage to the
motorcycle or a component.
NOTE
Other information of particular importance has been
placed in italic type.
S&S urges you to take special notice of these advisories.
Instruction Contents:
A. Introduction
B. Additional Features
C. Kit Contents
D. Polishing, Painting, Plating, or Powdercoating S&S
Crankcases
E. Preparation and Installation
F. Replacement Parts
Please read these instructions thoroughly before starting
work. Proceed with the installation only after they are
completely understood. These instructions should be
supplemented by the appropriate OEM service manual for
your motorcycle. Follow all safety information.
A. Introduction
S&S T win Cam Style crankcase assemblies are for Twin
Cam “A” (non-counterbalanced) engine applications,
and are not for use in Twin Cam “B” (counterbalanced)
applications. Installation can be performed by any
Harley-Davidson repair shop equipped to do complete
engine overhauls. No special tools other than those
used in normal engine building operations are required.
Stock bore cases are perfect for stock replacement
applications, 4" bore cases are a natural for use with the
S&S Twin Cam style Super Sidewinder™Hot Set Up kits,
and 4-1/8 bore cases make it possible to build really large
displacement custom engines.
NOTE - S&S crankcases are sold in matched sets only.
Individual case halves are not available.
B. Additional features:
● Greater overall strength than stock crankcases,
especially in the front motor mount, an important
consideration in high performance applications.
● All oil passages between the crankcase and gear
cover are o-ring sealed.
● Compatible with stock components. Use stock oil
pump, cam support plate, gear cover, etc.
● 1999-2002 Timken style sprocket shaft bearing.
(Included)
● Uses 2003-up pinion shaft bearing (Not Included)
● Special order Twin Cam style crankcases offer
your choice of cylinder spigot bore, cylinder stud
pattern, and your choice of rear motor mount style
(Twin Cam style or Evolution style).
C. Kit Contents
Crankcase with camshaft bearings and cylinder studs installed
Sprocket Shaft Bearings
Oil Conduit Block
S&S Reed Valve Assembly
Hardware Package
Certificate of Origin
Instructions
D. Polishing, Painting, Plating, or Powder Coating S&S
Crankcases
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.
The customer must also verify that the serial numbers
on the crankcase and attached information tag
correspond with those on the certificate of origin and
packing carton.
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.
Powder Coating - Subjecting heat-treated alloys such
as those used in S&S crankcases to excessive heat
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S&S Twin Cam Style
Crankcase Selection Chart
Bore Size Natural Black Polished
Stock Bore 31-0101 31-0102 31-0103
4" Bore 31-0104 31-0105 31-0106
4-1/8” Bore 31-0107 31-0108 31-0109
Special Order 31-0110 31-0120
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