SERVICE MANUAL NUMBER 23
RISERS
Maintenance Instructions
Maintenance inspection is owner’s responsibility and must be performed at intervals speci-
fied in owner’s “Operation and Maintenance Manual”.
1.
2.
3.
Check to ensure exhaust elbow and manifold fasteners are adequately tightened.
Check to ensure hose clamps are adequately tightened.
Check area around exhaust elbows, manifolds and riser gaskets for leakage. Replace
gaskets, if necessary.
CAUTION
Water must be completely drained from exhaust elbow riser during freezing temper-
atures. Failure to perform draining procedures can cause severe damage.
Installation Diagrams
Cast Iron Elbows With 3 Inch Riser
i
f
a
e
k
c
d
h
g
j
70621
a - Exhaust Elbow
b - Separator Gasket
c - 3 Inch (76 mm) Exhaust Riser
d - Open Gasket
e - Restrictor Gasket
f - Nut (8)
g - Stud (8) 9-3/8 Inch (238 mm)
h - Stud (8) 10-3/8 Inch (264 mm) Used With Remote Oil Filter
i - Washer (8)
j - Exhaust Manifold
k - Refer To Note Following
NOTE: Later models will have an open gasket (four slots) instead of a restrictor gasket (two
slots and two holes). If replacing gaskets, it is acceptable to replace the old gaskets with the
open gaskets. Be sure that the same type of gasket is used on both manifolds.
Index
90-861326--1
MARCH 1999
Page 7C-5
| 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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