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Re: Heat Shield on Manifold 200 1988

posted by  someone claiming to be Don Foster on  Tue Jan 2 13:08 CST 2001 [RELATED]

Peter B. --

The "heat shield" is actually a shroud used to channel air around the hot exhaust manifold. The intake system, via the air filter housing, air thermostat, and metal hose, channels this preheated air into the engine intake while it warms up—and then, as it gets very hot, begins to mix in some cold outside air.

To be effective, you need to ensure that the metal hose is connected between this shroud and the air filter housing. The hose connects near the oil filter to a 2" diameter nipple on the shroud. Often this hose has long since disappeared.

But be aware that if the hose is intact and the air thermostat has failed (not uncommon) the super-heated air from the exhaust manifold can overheat the AMM, damaging it.



Don Foster (near Cape Cod, MA)





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