SERVICE MANUAL NUMBER 24
MANIFOLDS, ELBOWS AND RISERS
6.
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 and Service)
d - Exhaust Manifold
e - Bolts
Cleaning and Inspection
1.
2.
3.
Clean gasket material from all surfaces and wash parts in solvent.
Check water passages for foreign material. Passages must be clean for efficient cooling.
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.
4.
5.
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.
6.
7.
Inspect all parts carefully. Machined surfaces must be clean and free of all marks and
deep scratches, or water and exhaust leaks may result.
Check the flatness of all gasket surfaces. Maximum overall is .003 in. (0.07 mm), with
not more than a .001 in. (0.02 mm) difference within 1in. (25 mm).
NOTE: Maximum material that can be removed is .010 in. (0.25 mm) to true a gasket surface
up. When torquing the attaching bolts, make sure that they are not bottoming out in the man-
ifold’s threaded hole.
90-861327--1
OCTOBER 1999
Page 7B-3
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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