Installation

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MSD APS Starter

High Speed, Chevy 158/168 Tooth

PN 50952

WARNING: Before installing the APS Starter disconnect the

battery cables. When disconnecting the battery

cables, always remove the Negative (-) cable

ﬁrst and install it last.

1. Make sure the starter mounting ﬂange on the engine block

is clean and smooth.

2. Install the starter with the supplied hardware. It is recommended

to leave the shims out until the pinion gear to ring gear teeth

mesh is checked. Torque the bolts to 32 lb-ft.

3. Check that the position of the solenoid is away from direct

heat sources and other components. If there are clearance

problems, the starter housing can be rotated to move the

location of the solenoid. This is done by removing the three

bolts on the mounting block and repositioning the starter

motor (Figure 1).

Figure 1 Clocking the Starter for Clearance.

CLOCKING

LOCATIONS

M S D • W W W . M S D P E R F O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4

ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered in our

monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product will help if there

is ever a warranty issue with your product and helps the MSD R&D team create new products that you

ask for! Go to www.msdperformance.com/registration.

Parts Included:

1 - Starter

2 - Mounting Bolts

2 - Mounting Block Shims

1 - Shim Ring

1 - Outer Shim

Thank you for purchasing the APS High Speed Starter from MSD, PN 50952. This starter is designed

to replace the starter on GM engine blocks and will ﬁt either standard or offset mounts. The APS

line of starters is speciﬁcally designed to start the engine time after time, even when it is very high

compression, hot, or has any other special circumstance that causes lesser made starters to fail.

Thanks to special gearing and other design features, the High Speed starter spins 25% faster than our

tradition APS starters. This extra speed is ideal for engines with magnetos or blown alcohol. Please

be sure to read, understand, and follow the instructions prior to installation so that everything goes

smoothly and the engine starts reliably time after time.

IMPORTANT: Proper installation of the APS Starter is important to the overall operation. Correct

alignment of the starter pinion with the ring gear is needed to achieve the best operation

and longevity from your starter. Please read the instructions before attempting the

installation.

Summary of content (4 pages)

PAGE 1
MSD APS Starter High Speed, Chevy 158/168 Tooth PN 50952 ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered in our monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product will help if there is ever a warranty issue with your product and helps the MSD R&D team create new products that you ask for! Go to www.msdperformance.com/registration. Thank you for purchasing the APS High Speed Starter from MSD, PN 50952.
PAGE 2
INSTALLATION INSTRUCTIONS 4. With the starter installed, check the clearance between the ring gear and the edge of the pinion gear (Figure 2). There should be at least 1/16". It is recommended to check this clearance in at least three places around the flex plate. • If there is not enough clearance, you will need to install the supplied shim kit by removing the mounting block (Figure 3). Place the small shim ring in the bearing bore and install the outer shim on the support housing.
PAGE 3
INSTALLATION INSTRUCTIONS 3 12-GAUGE MINIMUM TO IGNITION SWITCH CABLE LENGTH VS. GAUGE LENGTH 3’ 5’ 7’ 10’ +10’ AWG 4 2 1 0 00 + BATTERY Figure 5 Wiring the Starter. INSTALLATION INFO INSPECT PINION GEAR After cranking the engine several times, you can inspect the witness pattern on the pinion gear. The pattern should show 1/4" to 3/8". If over, the internal shim is required.
PAGE 4
CAST IRON STARTERS The MSD APS Starter is meant to replace factory starters that were equipped with a aluminum front housing (nose). If your original starter was cast iron, more shims may be required to achieve proper ring gear engagement.