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Control Piston Update - Tech 1726
Technical Information Update
Engine Concern - Screeching noise from the engine during the warm-up phase.
Symptom: A screeching noise can be heard from the engine at around 2,000 rpm during the engine warm-up phase. In many cases, the noise is an indication that the engine or oil pump has been changed. The noise is caused by the control piston in the oil pump.
If this is diagnosed as being the cause of the noise, this updated control piston must be installed in the oil pump cover. This typically only effects early 2005-2006 models. The fix includes a new control piston and seal. Professional installation and diagnosis is recommended.
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