Mazda Engine >> COOLANT IN THE OIL
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Mazda Engine >> COOLANT IN THE OIL
Coolant In The Oil On
Mazda 1.5 & 1.6L Engines
AERA member machine shops should carefully inspect the cylinder head when resolving engine oil contamination complaints.
The cylinder head carries two cup type freeze plugs on the valve spring side of the cylinder head. Leaking freeze plugs will accumulate a black residue during operations. Pressure testing the cylinder head confirms that the plug or plugs were leaking.
Successful repairs include replacement of the plug or peening the metal surrounding the plug over it. Be sure to re-pressure test the cylinder head after repairs are completed.
The AERA Technical Committee
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