SERVICE MANUAL NUMBER 23
RISERS
Exhaust Risers
Removal
1.
2.
3.
Remove any items attached to the elbows on the engine and carefully lay them aside.
Remember their positioning for reassembly later.
Remove fasteners retaining exhaust elbows and risers to manifolds and retain. Remove
exhaust elbows.
Remove and discard old gaskets.
Cleaning
1.
1.
Clean gasket mating surfaces on elbows, manifolds and risers.
Inspect sealing surfaces for leakage and / or corrosion
Inspection
a
a
75759
a - Inspect These Surfaces
Installation
1.
2.
Assemble studs to exhaust manifold and position all gaskets as shown between risers.
Refer to “Installation Diagrams” at the end of this section.
Position gaskets (REFER TO EXPLODED VIEWS ON FOLLOWING PAGES), install
elbows to risers and attach using nuts and washers from kit. Torque to 23-32 Ft. Lb.
(32-43
N·m).
IMPORTANT: Restrictor gaskets or manifold separator gaskets must be installed in
order shown.
3.
Install elbow on riser(s) and studs. Attach using nuts and washers.
NOTE: Drain plugs in risers must be positioned facing flywheel end of engine, unless other-
wise noted.
4.
5.
Torque all fasteners, in a diagonal pattern, to 27 lb.ft. (37 N·m).
Place spacers between riser plate, if equipped, and fasten with existing nuts. Tighten
securely.
6.
Reattach and tighten securely all parts previously removed from elbow to appropriate
position on riser bracket, if equipped.
Index
90-861326--1
MARCH 1999
Page 7C-3
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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