Fix Honda rattles when cold
Honda has issued a service bulletin #09-010 to address a Honda rattles when cold condition on the vehicles listed below with the 2.4L engine.
The service bulletin to correct the Honda Accord rattles condition applies to these vehicles:
2008-12 ACCORD L4 – ALL
2007-12 CR-V – ALL
Honda describes the problem as a loud rattle for about 2-secs when starting a cold engine. Honda has determined that the variable valve timing control actuator is defective. Just obtain the updated parts listed below along with Hondabond HT Liquid Silicone Gasket: #08718-0004
VTC actuator part numbers
2007-09 CR-V: #14310-RZA-003
2010-11 CR-V: #14310-R40-AO1
2012CR-V and 2008-12 Accord L4: #14310-R44-A01
Here’s how to replace the VTC actuator:
1. Let the engine sit for at least 6 hours to allow time for the oil to drain from the VTC system.
2. Start the engine, and listen for a loud rattle. If you hear the sound, you’ve confirmed the problem is the VTC actuator.
3. Then remove the frame (strut) or brace (if equipped).
4. Remove the engine decorative cover.
5. Remove the ignition coil cover and the ignition coils.
6. Remove the engine oil dipstick. Next, disconnect the breather hose and the brake booster vacuum hose from the cylinder head cover.
7. Remove the two bolts holding the EVAP canister purge valve bracket to the cylinder head.
8. Remove the valve cover.
9. Raise the vehicle on a lift.
10. Turn the front wheels or remove the right front wheel.
11. Remove the splash shield to provide access to the crankshaft pulley.
12. Remove the camshaft auto-tensioner (chain case) cover.
13. Rotate the crankshaft clockwise to top dead center (TDC) No.1 cylinder.
14. Rotate the crankshaft counterclockwise to compress the auto-tensioner. Align the hole in the lock and auto-tensioner, then insert a 1.2 mm (0.05 in) diameter stopper (lock pin).
15. Rotate the crankshaft clockwise to TDC No.1 cylinder.
16. Lower the vehicle.
17. Mark the timing chain at the punch marks on the exhaust camshaft sprocket and VTC actuator. Secure the chain to the sprocket with a wire tie.
18. Loosen the camshaft holder bolts, in sequence, two turns at a time.
19. Remove the five camshaft holders. Set them aside on a clean surface in the exact order and position that they were removed from the cylinder head.
20. Carefully tip up the end of the intake camshaft until there is enough slack for an assistant to lift the chain off the VTC actuator teeth.
21. Remove the intake camshaft/VTC actuator assembly while the assistant keeps light tension on the chain. Place the camshaft/VTC actuator assembly on a clean, padded workbench.
22. Secure the timing chain to the A/C compressor hose using a wire or zip tie to keep it from falling into the front cover.
23. On the workbench, get an assistant to hold the camshaft steady with an open-end wrench, remove the actuator mounting bolt, then separate the VTC actuator from the camshaft. Discard the faulty actuator.
24. Before installing the new VTC actuator, make sure it is in the unlocked position.
25. Install the new, unlocked VTC actuator onto the camshaft; do not force it on.
26. Once fitted, with the VTC actuator facing you, carefully rotate it counterclockwise until it engages the camshaft’s locator pin. When installed and rotated this way, the VTC actuator will not lock. Apply clean engine oil to the mounting bolt threads, then install the mounting bolt finger tight.
27. To unlock a locked VTC actuator, apply clean engine oil to the mounting bolt threads, then install the mounting bolt finger tight on the actuator.
28. Seal pressure port #1 on the camshaft with several wraps of electrical tape. Secure the tape with a zip tie, as shown.
29. Apply compressed air to pressure port # 2. While air pressure is applied to pressure port # 2, rotate the complete the VTC unlock procedure by rotating the VTC Actuator by hand in the direction shown (as needed) to unlock the VTC Actuator. Verify the actuator has moved to the unlock position. Afterward, make sure to remove all electrical tape and adhesive residue.
30. Have an assistant hold the camshaft/VTC actuator assembly steady on the padded workbench with an open-end wrench. Use a torque wrench to torque the mounting bolt to 113 N.m (83 lb-ft).
31. After the mounting bolt is torqued, rotate the VTC actuator to the locked position
32. Remove the wire ties as an assistant keeps light tension on the chain.
33. Slide the camshaft/VTC actuator in at an angle so that the chain can slip over the actuator’s teeth.
34. Line up the marks you made on the chain with the punch marks on the exhaust camshaft sprocket and VTC actuator.
35. Apply engine oil to the journals and caps for both camshafts. Lower the camshaft/VTC actuator assembly onto its journals.
36. Install the camshaft holders. Tighten them down two turns at a time, starting in the middle and working your way outward, following the numbered sequence.
37. Remove the lock pin from the auto-tensioner.
38. Rotate the crankshaft in the direction of engine rotation (clockwise) two full turns, then stop at the white TDC mark. Make sure both camshafts line up, as shown in step 15.
39. Inside the cylinder block, visually confirm that the timing chain is properly riding on its guide, and has not slipped behind the guide in the block. If so, realign the chain as needed.
40. Remove the old sealant, dry, reseal, then reinstall the auto4ensioner (chain case) cover.
NOTE: Wait 30 minutes before adding oil, if needed, and wait 3 hours before starting the engine.
41. Check and, if needed, adjust the valve clearance using a tappet adjuster.
Intake: 0.21 -0.25 mm (0.008 – 0.010 in)
Exhaust: 0.25-0.29 mm (0.010 – 0.011 in)
42. Following adjustment, use a tappet locknut wrench to torque the locknuts.
Intake and Exhaust: 14 N.m (10 lb-ft)
43. Raise the vehicle.
44. Reinstall the splash shield.
45. Straighten the wheels or reinstall the right front wheel (if removed).
46. Lower the vehicle.
47. Reinstall the cylinder head cover, tightening the bolts in three steps. In the final step, tighten all bolts, in sequence, to 12 N.m (8.7 lb-ft).
48. Reinstall the EVAP canister purge valve bracket.
49. Reinstall the engine oil dipstick, and reconnect the breather hose and the brake booster vacuum hose.
50. Reinstall the ignition coils and the ignition coil cover.
51. Reinstall the engine cover.
52. Reinstall the frame (strut) brace (if equipped). Torque the bolts to 22 N.m (16 lb-ft).
©, 2016 Rick MuscoplatPosted on by Rick Muscoplat