Briggs & Stratton BIG BLOCK EFI, Repair Manual

Page: 118 / 142

114 Section 5: Removal/Installation
f. Install hex nut on each of two puller
screws. Insert puller screws through
holes in puller tool, and then thread into
fl ywheel an equal number of turns.
g. Rotate hex nuts until contact is made
with the puller tool. Verify that the puller
tool is square. See Figure 5-9.
h. Holding screws to prevent rotation,
alternately turn each hex nut in small
increments until the fl ywheel is free.
i. Remove fl ywheel from crankshaft.
CAUTION: Keep fi ngers away from in-
side edge of fl ywheel during removal. Sta-
tor magnets are powerful and may pull the
fl ywheel in with suffi cient force to cause
hand injury.
j. Remove screws to release puller tool
from fl ywheel.
3. Remove four TORX screws to release
backplate (and oil fi ll tube fl ange) from cyl-
inder mounting bosses.
4. See A of Figure 5-10. Proceed as follows:
• Disconnect 6-place (or 8-place) engine to
chassis connector.
• Disconnect starter solenoid ring and spade
terminals.
• Remove hex fl ange screw to release
ground wire ring terminal from cylinder
boss.
• Remove two hex fl ange screws to release
starter motor from cylinder 1.
• Disconnect voltage regulator connector.
• Remove hex fl ange screw to release fuse/
relay block cover and voltage regulator bot-
tom fl ange from cylinder 1 heat shield.
• Disconnect ECM J1 and J2 connectors.
Disconnect ECM ground wire ring terminal.
5. See B of Figure 5-10. Proceed as follows:
• Remove TORX screw to release EHT sen-
sor bracket from cylinder 1.
NOTE: Ignition coil connectors are discon-
nected during blower housing removal.
• Disconnect fuel injector connectors.
• Disconnect HO
2
sensor connector.
• Disconnect MAP/MAT sensor connector.
• Remove EFI wire harness from retaining
clip on fuel rail (centered at front of intake
elbow).
• Cut cable strap to release EFI wire harness
from intake manifold.
6. See C of Figure 5-10. Proceed as follows:
• Disconnect CKP sensor connector.
• Disconnect fuel pump module connector.
• Disconnect oil pressure switch connector.
Release wire from hose clip on cylinder 2
heat shield.
7. Remove EFI wire harness from engine.
Installation
1. Position new EFI wire harness on engine
separating conduit and connectors into
three groups as shown in Figure 5-10. Pro-
ceed as follows:
Figure 5-9 Install Flywheel Puller (Part No. 19621).