- Sep 4, 2010
- Reaction score
- Isle of Mull, UK
As I said above Dave at Billcar (The No.1 UK YD25 independant specialist) has never known the lower tensioner to fail.That poll shows an spread through the earlier years but that could also be explained by age or distance "wear and tear" - doesn't make it right, the timing chains aren't supposed to have a "best before" date!
It still seems to be the case that it's not the chain failing, it's the tensioner.
The same tensioners are fitted to the YD25 engine in the D22 and there is no problem with the ones fitted with the lower duplex chain (2001-2005). The problem is the single chain being used on a more powerful engine.
As for the poll and the age of the vehicles involved. The extended (hidden warranty) on the timing chain has no doubt given owners of newer vehicles a fall back and peace of mind should the chain fail within the warranty period.
I blanked off my EGR valve at 80k miles.There was a Kiwi that joined the forum who said he worked for Nissan and that it was caused by the EGR turning the oil acidic. He reckoned there was a software update to fix it but wasn't sure what it did. Here http://www.navara.asia/showpost.php?p=263491&postcount=38 and here http://www.navara.asia/showthread.php?t=17517