S&S Cycle Oil Supply Line Installation Kit PN 31-0424 (For 1999–2005 Harley-Davidson Dyna Models) PN 31-0425 (For 2000–2006 FLT Models) - Manual (Page 2)

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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.
OIL LINE INSTALLATION
FOR 1999-2006 HARLEY-DAVIDSON® FL MODELS PN 31-0425
CAUTION
Oil line installation is crucial to engine life. If you are not sure
that you can properly perform this operation, please contact the
S&S Tech Department for a referral to a shop in your area.
NOTE: Installation instructions are based on an engine and transmission
already in the chassis.
NOTE: Apply thread sealant to all tapered pipe threads.
1- Remove the stock oil supply and return fittings from the
transmission.
2- Install two supplied 3⁄8 NPT pipe plugs (S&S PN50-8330) in
the oil fitting location.
NOTE: Apply thread sealant to all tapered pipe threads.
3- Remove crankcase vent fitting (S&S PN 50-0451) and set
aside for later use. Install supplied vent fitting (S&S PN
50-0449 is for use with 2002-’06 with 7⁄16 ID vent hose or
50-0454 is for use with 1999-’01 with 3⁄8 ID vent hose) with
O-ring installed on fitting. See Picture 1.
4- Install the vent hose and clamp (S&S PN 50-8293 or 50-
8076-S) on the new fitting.
NOTE: The stock vent hose is reused in this step.
5- Position a drain container in front of the oil pan. Next,
locate and remove the two plugs on the forward face of the
oil pan allowing the oil to drain. Once the oil is completely
drained, replace the 3⁄8" pipe-plug with a 90˚ fitting (S&S PN
106-1170). Position barb of fitting toward right side of bike
at an angle slightly above horizontal as shown in Picture
2. Next, install the oil return fitting (S&S PN 50-0451) with
O-ring (S&S PN 50-8008) in the drain plug location.
6- Remove cover plate that was shipped on crankcase from
the bottom surface of the rear motor mount. The oil line
block will be installed in this location. Assemble the oil
line block by installing the 90˚ fitting (S&S PN 106-1170)
and the oil return fitting (S&S PN50-0451) with O-ring
(S&S PN 50-8008) into the block, as shown in Picture 3,
next page.
7- Mount the oil line block on the crankcase using 5⁄16-18 x 13⁄4"
long screw (S&S PN50-0437)—do not final tighten as it will
be removed again.
8- The next step is to measure and then cut the oil hoses. The
straight hose connects the 90˚ fittings of the oil line block
and oil pan. The bent hose runs between the oil return
fittings on the oil line block and oil pan. See Picture 4,
next page.
9- Remove the oil line block from the engine case. Install the
supplied clamps (S&S PN 50-8293) on the lines between
the fittings. See Picture 5, next page.
10- Install O-Rings (S&S PN 50-8066) in the counter bores of
the oil line block. Position the oil line block on the engine
case and tighten the screw to 18 ft-lbs. of torque with blue
threadlock on the threads. See Picture 6, next page.
11- Position hose clamps over the fittings.
12- Refill oil reservoir.
13- Start engine and check for oil leaks.
To Change Engine Oil in the Future
1- Slide hose clamp off of fitting along hose. See Picture 7, next
page.
2- Place an oil drain pan under front of oil pan.
3- Remove hose from fitting to drain oil.
4- Reinstall hose and clamp.
5- Continue with recommended oil change procedure.
Picture 1 (2002-'06) Picture 2
Supply
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