Engine - Brief Rattle/Knock On Cold Start Up
S-SB-0046-09September 30, 2009
Brief Engine Knock/Rattle Noise at Cold Startup
Service Category
Engine/Hybrid System
Section
Engine Mechanical
Market
USA
Applicability
Introduction
Immediately following a cold soak startup some 2008 - 2009 model year Scion xD vehicles may exhibit a brief knock/rattle noise from the engine compartment for approximately one second. Follow the repair procedure below to address this condition.
Parts Information
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle's in-service date.
^ Warranty application is limited to occurrence of the specified condition described in this bulletin.
Required Tools & Equipment
Repair Procedure
Confirm the customer complaint. See attached video for an example of the engine knock/rattle noise:
1. If a knock/rattle noise is present replace the camshaft timing gear assembly.
HINT
This repair is simplified by performing the following:
^ DO NOT remove the engine - complete the repair in the vehicle.
^ Set No.1 cylinder to TDC/compression.
^ DO NOT remove the timing cover or camshaft housing sub-assembly.
^ Loosen and remove all camshaft bearing caps. Remove the No.1 camshaft bearing cap and No.2 timing chain vibration damper as an assembly - DO NOT separate.
^ Remove the intake camshaft with the camshaft gear intact and tie the timing chain to keep tension on the crankshaft timing gear, avoiding separation.
^ Ensure the new camshaft gear is unlocked (advanced position) prior to installation and lock the gear (fully retarded position) AFTER tightening to proper torque.
Refer to the Technical Information System (TIS) applicable model and model year Repair Manual:
2008 Scion xD:
2009 Scion xD:
2. Confirm the repair.