Post by newtonandbailey on Dec 11, 2008 6:14:01 GMT 6
Hi i work in a independent Nissan garage .my navara went bang 2 years ago and had to sell as spares. in June this year my new 05 navara went bang and Nissan replaced the engine free of charge under customer goodwill as i argued that 2 of the same engines with full service history should not have blown.Thank you Nissan.
since then i have been advising my customers to change the bearings and conrod bolts as a precaution at a cost of £600. i have replaced 4 sets of big end bearings and each car had full history and no apparent fault until i removed no 3 conrod cap..
when i remove the bearings i always! find no 3 top big end bearing has failed.i do not believe it to be a bearing fault as this would affect all cylinders.i do not think it is a torque.or bolt fault as the cap bolts are always still set to the correct torque . i hope this info helps as i dont think many of you will have seen the bearings except for when they fail and the con rod is lost down the road.seeing them after they fail may lead to the conclusion of incorrect torque or faulty bolts.but seeing them before they fail,i believe the fault is when they are put together eg debris in no 3 crank oil feed hole or maybe the machine putting the bearing in marks it in some way.in all cases the bearing started to fail at the same spot on the rear most side in of the bearing as it sits in the Conrod,not where you would expect it to and it starts from a mark the size of a pin head and spreads accross the bearing face. be warned if my findings are to go buy get you bearings changed before the go.
since then i have been advising my customers to change the bearings and conrod bolts as a precaution at a cost of £600. i have replaced 4 sets of big end bearings and each car had full history and no apparent fault until i removed no 3 conrod cap..
when i remove the bearings i always! find no 3 top big end bearing has failed.i do not believe it to be a bearing fault as this would affect all cylinders.i do not think it is a torque.or bolt fault as the cap bolts are always still set to the correct torque . i hope this info helps as i dont think many of you will have seen the bearings except for when they fail and the con rod is lost down the road.seeing them after they fail may lead to the conclusion of incorrect torque or faulty bolts.but seeing them before they fail,i believe the fault is when they are put together eg debris in no 3 crank oil feed hole or maybe the machine putting the bearing in marks it in some way.in all cases the bearing started to fail at the same spot on the rear most side in of the bearing as it sits in the Conrod,not where you would expect it to and it starts from a mark the size of a pin head and spreads accross the bearing face. be warned if my findings are to go buy get you bearings changed before the go.
