Download 2004-2009 Mazda3 2006-2009 Mazda5 2003-2008 Mazda6 with L3 Engine 2006-2009 MX-5 DESCRIPTION This bulletin provides guidelines for repairing internal engine noise issues (such as Knocking, Ticking, Tapping, Rattling, Grinding, Squealing, Squeaking, Thumping, Whining, Creaking, Popping, Clicking, Roaring, Loud, High-pitched etc). When engine replacement is necessary, use short block or long block according to following guideline. Do not replace long block assembly if short block assembly or cylinder head assembly will resolve concern. Guideline for Short Engine/Cylinder Head Replacement SERVICE POINTS TO DETERMINE PARTS REUSEABILITY 1. Cylinder Head Check for contact mark between the cylinder head (A) and piston (B). Check for carbon peeling or valve to piston interference. – If OK, flush cylinder head (with valves assembled) with kerosene and blow oil passages with regulated shop air. – If no good, contact MASH for authorization to replace cylinder head assembly and related damaged components.