Caution – S&S Cycle Crankcase for Harley-Davidson Twin Cam 88 Engines User Manual

Page 11

Crankcase Cylinder Studs

S&S

crankcases for Harley-Davidson

Twin Cam 88

engines

are shipped with cylinder studs installed Before assembling
engine, verify that the lower collar of each stud is contacting
the case deck, and that the studs are torqued to 10 ft.-lbs.

Removal

Thread two

⁄

”-16 nuts onto end of stud and

tighten them together.

Use a wrench on the lower nut to remove stud.

Installation

Place a ball bearing into the end of a head bolt
then place the head bolt on end of the stud
without a collar.

Screw stud into the case, collar side down, until
collar contacts case. Torque stud to 10-ft.-lbs.

Do not carry the 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.

7- Flywheel Assembly

S&S

crankcases for Harley-Davidson

Twin Cam 88

engines

are designed to use any S&S flywheel assembly, or 1999-2002
Harley-Davidson flywheel assembly.

NOTE: 2003-up Harley-Davidson

flywheel assemblies will not fit

in S&S crankcases. For 2003, Harley-Davidson started using a flat

roller bearing on the sprocket shaft. S&S cases must use flywheel

assemblies that use dual taper roller bearings.

NOTE: 2003-up flat roller sprocket shaft bearing is not compatible

with S&S cases

It is not recommended to attempt using a 2003-up flywheel
assembly by changing the sprocket bearing from the flat
roller style to the earlier dual taper style. The sprocket
bearing inner race of the 2003-up sprocket shaft is a non-
serviceable item, per the OEM service manual. Attempting to
remove the pressed on sprocket bearing inner race from the
sprocket shaft of 2003 Harley-Davidson® flywheel assemblies
can easily result in serious damage to the flywheel assembly.

a- Sprocket shaft bearings: Use 1999-2002 style taper roller

bearings, included with the crankcase. They must be
used with a 1999-2002 style flywheel assembly,
purchased separately.

Installing and setting the clearances for 1999-2002 style taper
roller bearings is a critical operation. install and set clearances
per 1999-2002 Harley-Davidson service manual.

NOTES

G S&S crankcases secure the pinion bearing in place with a snap

ring. 2003-up Harley-Davidson cases do not.

G 1999-2002 pinion shaft bearing is not compatible with S&S

crankcases. It has a larger outside diameter than the 2003-

up style used by the S&S cases.

8- Camshaft And Cam Plate Installation

S&S Camshafts install using the instructions packaged with
them. Harley-Davidson camshafts install per 1999-2003 Twin
Cam 88

service manual.

S&S Reed Valve Installation
The S&S Reed Valve Assembly 31-2071 included with the
crankcase is an effective way to control internal air pressures
inside the crankcase, reducing oil carry over, blow-by, and oil
leakage. It is a one-way valve that allows for the smooth
passage of air through and out of the engine breathing
system. Installation of the S&S Reed valve is optional. It is not
required for crankcase assembly. However, its use is highly
recommended. It installs easily, and requires no extra
machining. A separate Instruction sheet is packaged with the
Reed Valve. See Picture 12.

10- Oil Pump, Lifters, Lifter Covers, and Cam Cover Installation

These and any other crankcase components not listed install
per 1999-2003 Harley-Davidson

Twin Cam 88

service

manual.

Use only S&S #31-2325 stud in
S&S crankcases for Twin Cam 88

Threaded end with collar is .230”
shorter than OEM studs (clearance
requirements)

CAUTION

Picture 12

S&S Reed Valve assembly and wave washer