G'day folks, I'm starting this thread to discuss, but more importantly, collect data on the premature timing chain failures which are apparent in the early series one aussie Y62 patrols. The issue seems to be limited to the pre March 2013 build vehicles (all with the VK56VD engines), typically with as little as 84K and up to 150K kms on the clock. Interestingly, the American VK56DE engines fitted to the Armada QX56 were plagued by the same issue.
The issue begins with timing chain stretch. As it stretches, the chain guide tensioner pushes the chain out so much it comes into contact with an oiler jet causing engine noise (squealing and rattling) from the front of the engine. The oiler eventually fails and the problem worsens. The engine's cam timing is also affected which can result in poor acceleration.
Video of noise:
Post March 2013, the issue seems to be non-existent ie. engines built after this date do not have the issue as they have been built with revised (beefier) timing chains that do not stretch like the earlier ones.
Cost of repairs (parts only) is approx AU$1300. Add labour and you're looking at nearly AU$6,000. The replacement chain in the repair kit is heavier duty so once repaired it's all happy days.
Repair info: https://static.nhtsa.gov/odi/tsbs/2016/SB-10091401-2280.pdf
To drill down further and hopefully segment the affected engines, I've collected a little information, (from FB and alike) to combine build dates with engine numbers. It's only a start so please feel free to add information and comments so that people who have or are contemplating purchasing a 2012 or an early 2013 Series 1 Y62 Patrol have a heads-up of what could be a potential issue. If you have one outside or close to these dates with or without issues, please share the info.
Please provide the Build Date on compliance plate, the last six digits of the engine number and the kms; (Scroll past the pics)
Damaged oiler
Dec 2012, Engine # 0000665 (my earliest known failure). 147,000kms
2013, Engine # 0000867 - Failure - 130,000kms
Jan 2013, Engine # 0000997 - Failure - 110,000 kms
Feb 2013, Engine # 0001614 - Good so far
The issue begins with timing chain stretch. As it stretches, the chain guide tensioner pushes the chain out so much it comes into contact with an oiler jet causing engine noise (squealing and rattling) from the front of the engine. The oiler eventually fails and the problem worsens. The engine's cam timing is also affected which can result in poor acceleration.
Video of noise:
Post March 2013, the issue seems to be non-existent ie. engines built after this date do not have the issue as they have been built with revised (beefier) timing chains that do not stretch like the earlier ones.
Cost of repairs (parts only) is approx AU$1300. Add labour and you're looking at nearly AU$6,000. The replacement chain in the repair kit is heavier duty so once repaired it's all happy days.
Repair info: https://static.nhtsa.gov/odi/tsbs/2016/SB-10091401-2280.pdf
To drill down further and hopefully segment the affected engines, I've collected a little information, (from FB and alike) to combine build dates with engine numbers. It's only a start so please feel free to add information and comments so that people who have or are contemplating purchasing a 2012 or an early 2013 Series 1 Y62 Patrol have a heads-up of what could be a potential issue. If you have one outside or close to these dates with or without issues, please share the info.
Please provide the Build Date on compliance plate, the last six digits of the engine number and the kms; (Scroll past the pics)
Damaged oiler
Dec 2012, Engine # 0000665 (my earliest known failure). 147,000kms
2013, Engine # 0000867 - Failure - 130,000kms
Jan 2013, Engine # 0000997 - Failure - 110,000 kms
Feb 2013, Engine # 0001614 - Good so far