SERVICE MANUAL NUMBER 23
MANIFOLDS AND ELBOWS
7.
Remove exhaust manifold fasteners. Remove manifold assembly and discard gaskets.
a
e
b
c
d
75749
a - Exhaust Elbow
b - Restrictor Gasket
c - Open Gasket (Later Models)
d - Exhaust Manifold
e - Bolts
Cleaning
1.
2.
Clean gasket material from all surfaces and wash parts in solvent.
Checkwaterpassagesforforeignmaterial.Passagesmustbecleanforefficientcooling.
Inspection
1.
If more thorough inspection is desired, pipe plugs may be removed from exhaust man-
ifold and exhaust elbow.
IMPORTANT: If plugs are removed, coat threads with Quicksilver Perfect Seal before
reinstalling.
2.
3.
Check for cracks.
To test manifold body for leaks, block-off plates, plugs, or short hoses with plugged ends
must be used. One block-off plate must have a threaded hole for attaching compressed
air hose. Use new gaskets when installing block-off plate(s). Apply 40 PSI (276 kPa) of
air pressure and submerge manifold in water. Air bubbles will indicate a leak.
4.
Inspect all parts carefully. Machined surfaces must be clean and free of all marks and
deep scratches, or water and exhaust leaks may result.
90-861326--1
MARCH 1999
Page 7B-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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