GEO Engine >> BURNED EXHAUST VALVES

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GEO Engine >> BURNED EXHAUST VALVES


Burned Exhaust Valves On
GM 1.0L Geo Engines

The AERA Technical Committee has received calls concerning repeated exhaust valve burning on GM 1.0L engines used in the Geo Metro. One reason for this type of failure may be caused by a restriction in the exhaust system.

After repairing a cylinder head with a burned exhaust valve, instruct your customer to perform an exhaust system backpressure check. After the engine has reached normal operating temperatures, this test should be performed at 2,500 rpm. A value of 2.8 psi or higher indicates a restricted exhaust condition.

An exhaust restriction may be due to a collapsed header pipe, internal center pipe failure, internal muffler failure, a damaged tailpipe or a plugged catalytic converter.

The AERA Technical Committee
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