Nissan Engine >> COOLANT IN THE ENGINE OIL
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Nissan Engine >> COOLANT IN THE ENGINE OIL
Coolant In The Engine Oil In
1989-99 Nissan 2.4L KA24 Engines
AERA members have reported engine coolant in the engine oil supply in 1989-99 Nissan 2.4L KA24 engines. Vehicle owners have expressed engine-overheating complaints and loss of engine coolant. The source of this coolant loss has not been the cylinder head, which is most often first suspected. Removal of the cylinder head may not be necessary if the information in this bulletin is first considered.
These engines use a timing chain to rotate the single or dual camshaft design used. If that chain is allowed to run loose, it may contact the front cover and wear a hole into the aluminum cover allowing coolant to enter the crankcase. To determine if this condition is present, some technicians have detected the area of leakage by attempting to pressurize the cooling system. Before any pressure builds up, an audible hissing noise has been noticed and verified with a stethoscope at the engine?s front cover.
For more information on this engine?s timing chain tensioner, see TB-1652
The AERA Technical Committee
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