I've never worked on the AJ-V6, so don't know it's own problems, but I did used to build and repair engines as part of the OEM replacement scheme.
The company I worked for had customers such as Ford, GM, Jaguar, Land Rover, Lotus. The first three being the main consumers.
Big end failure is usually down to the shells. Whether that is because they have worn away, or whether that is because there has been an oil starvation causing them to wear away. That can be the 'mains' shells between the crank and block, but is more usually the cod-rod shells as they get more abuse. The crank can wear too, but of course the shells will have worn first. If you're going to do it, get a full set of shells, don't even think about re-using the old ones.
If you take the crank out, always throw all the shells in the bin. Likewise, replace the oil spits in the block too. These can block up and restrict oil flow to the bearings.
Personally, I would leave well alone the boring out of cylinders. The better way would be to totally bore them out and then fit sleeves to your desired size. Which pistons would you then use? I think there are better ways to gain more power from the ECU. Boring it out will only lead to more problems in the head. (not your head, the car's) My opinion.
The company I worked for had customers such as Ford, GM, Jaguar, Land Rover, Lotus. The first three being the main consumers.
Big end failure is usually down to the shells. Whether that is because they have worn away, or whether that is because there has been an oil starvation causing them to wear away. That can be the 'mains' shells between the crank and block, but is more usually the cod-rod shells as they get more abuse. The crank can wear too, but of course the shells will have worn first. If you're going to do it, get a full set of shells, don't even think about re-using the old ones.
If you take the crank out, always throw all the shells in the bin. Likewise, replace the oil spits in the block too. These can block up and restrict oil flow to the bearings.
Personally, I would leave well alone the boring out of cylinders. The better way would be to totally bore them out and then fit sleeves to your desired size. Which pistons would you then use? I think there are better ways to gain more power from the ECU. Boring it out will only lead to more problems in the head. (not your head, the car's) My opinion.
