MANIFOLDS, ELBOWS AND RISERS SERVICE MANUAL NUMBER 22
Page 7B-14 90-860074--1 FEBRUARY 2002
9. Remove remaining intake / exhaust manifold flange nuts or nuts and lockwashers.
70881
a
Typical
a - Flange Nuts Or Nuts And Lockwashers
Cleaning and Inspection
1. Clean gasket material from all surfaces and wash parts in solvent.
2. Inspect all parts carefully. Machined surfaces must be clean and free of all marks and
deep scratches, or water and exhaust leaks may result.
3. Check water passages for foreign material. Passages must be clean for efficient cooling.
4. If more thorough inspection is desired, pipe plugs may be removed from exhaust
manifold and exhaust elbow.
IMPORTANT: If plugs are removed, coat threads with Perfect Seal before reinstalling.
5. Check for cracks.
6. Ensure mating surfaces of cylinder heads are clean and free of all old gasket material.
7. 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 276 kPa (40 psi) of
air pressure and submerge manifold in water. Air bubbles will indicate a leak.
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