![]() ![]() ![]() TSB LTB00474NAS3 (section 303-01) Rattle/Click noise from front of engine (which sucks, that would make the parts guys job easier) Hopefully this clears up part number questions as people dig into this project if they DIY or anything. The parts catalog only says the vin ranges and that a part is superseded, but not why or how the part changed. So either I have an outdated TSB, or they never had a 2013 tsb, (this was announced in 2015, so you would hope they knew about 2013 impact). and the FIX parts are outside the range of my vin. I don't know for sure that I have "the update" because they show I have the same parts as some of the impacted vin range, but yet my vin is after the vin range mentioned in the TSB. I did some digging on the parts just to see what exact parts my vin has in it (the * next to the part is where my vin falls on my mid year 2013) Sorry to bump this, but I recently got my own copy of microcat land rover parts program (running in vmware fusion on my mac). Prevention - Reduced oil change intervals and SeaFoam for all? It's no surprise under those circumstances that chains wear and PTFE components become brittle and fail." ".Every single picture I've seen of an engine undergoing a full timing chain change has had one thing in common - all the internal components are caked in brown deposits from heavily contaminated oil. If so that opens the door to all current generation engines, not just prior to 2013. Could it be related to the move to high fuel mileage lubrication or extended intervals? Tensioner issues are a symptom, not a root cause. "Hi i am seeing a lot of problem with timing chains, on newer 2010 and newer, plus we are seeing them on Mercedes Benz,BMW,Ford, and we are suspecting that with extended oil changes it is contributing to early failure of timing chains, another taught is that the oil do not have the proper additives to protect the timing chain and guides from wearing out, i have sent a couple of oil samples to get tested, so hopefully we will have some answers"īeginning to get the feeling that this is not a tensioner issue itself. While JLR has had a history of timing chain issues, interesting that there are multiple generations and that plastic tensioners where installed as an 'upgrade' at one time. These second-generation units are, to the best of our knowledge, more reliable than the originals." ![]() Note that late in the 1999 model year the factory began installing upgraded plastic tensioners. X303-68 of February 2005, titled “Rattle From Engine on Start-up and Idle,” Jaguar states. While the cars were under warranty, many tensioners were replaced by Jaguar service departments with improved components. (The new 4.2L version of the Jaguar AJ-V8 engine has double timing chains.)Īs a result of their weak design and other factors like engine overheating or poor maintenance, the plastic cam chain tensioners on 1997 to 2000 V8 Jaguars began to experience stress fractures, and so did some of the plastic guides. These plastic components are part of the AJ-V8's single-chain design, a weight-saving alternative to the more robust double-chain approach Jaguar has used on most of its six-cylinder engines. In their zeal to reduce the weight of the valve train and related components as a way of improving fuel efficiency, the engineers underdesigned the AJ-V8's timing gear: in particular, the cam chain tensioners. Designed in the mid-1990s by an all-Jaguar engineering team (including employees who worked on the previous twin-cam six), it proved to be a superb combination of lightness, torque, power, and fuel efficiency, the equal of anything from BMW or Mercedes. ![]() ".Jaguar’s 4.0-liter V8, known as the AJ-V8, was the first-ever eight-cylinder engine from that manufacturer. Hence the frequency of an issue appears to be higher than it really is. Keep in mind that those with issues will dominate discussions while those with no issues will not show up in the discussions. A little research found some interesting data points. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |