Recent content by jnwright71

Hi Justin, If this is all correct then this may point to either a faulty new chain tensioner or worn VANOS hub (as initially diagnosed by Simon). Cheers, James

Hi Z4M-2006, The garage is saying the plastic in the sump doesn’t appear to have come from the guides which are, in his opinion, unmarked. Every specialist I’ve spoken to says this is impossible, as the only way for plastic to get into the oil is from the chain guides (no other plastic...

Hi Justin / All, My two penneth. There was plastic in the oil, it shouldn’t have been there, so the guides MUST have been an issue. They have been replaced, but the noise has not gone. So, either the guides were an issue but not causing any noise and by coincidence they have been found to be...

Hi All, This continues to be a mystery. However, the one common here is that every mechanic (professional or DIY) that has looked at the car has said timing chain related, and the plastic in the sump can only be there due to guide damage which must be related to guide failure or chain tension...

Thanks Mike, good points and something that the garage needs to confirm. I will have the oil tonight, so will be able to post an image of the particles tomorrow. The tensioner is oil pressure fed and is brand new. Smartbear, thanks for the thought, but I did both oil changes myself and the...

Hi, Chain and the associated castings have supposedly been checked. However, the garage is being asked to check again and the metal particles will be analysed if required to define the metal type. The original master tech suggested that a broken or badly worn guide could allow slack in the...

Hi All, I’m sure Justin will be along later, but thought I would provide an update as this is getting weirder and weirder. Garage removed rocker cover and checked the VANOS gears, chain and upper guide. All perfect. No other signs of any issues. They then removed the filter housing (after...

As Justin has posted, oil and filter changed - no change. Top and lower DISA valves removed and checked, both perfect (getting to that lower DISA is a right royal pain in the a**e). In my opinion, I think this can be limited to a component that is rotational in nature, so potentially...

Z4M-2006, Video clip sent by WeTransfer. Your thoughts would be really appreciated. Thx, James

Hi All, The Z is now back at mine as Justin is away and will get a new filter in the morning and a full check over to ensure this isn't a heat shield or exhaust issue (have access to a 4 post lift - :thumbsup: ). Fingers crossed... Cheers, James

Hi All, Thanks for the feedback thus far and to Justin for his post. The DISA on the N52 is a slightly better deign than earlier engines in that there is no metal pin that can work lose and drop into the engine - positive development from BMW :thumbsup: Unfortunately, the new style DISA is...

Hi Olz, Did the new DISA resolve the problem ? Also, was the noise there when the engine was cold or only when warm ? Thx, James

Hi All, Been to see the car and am confident that it is not belt or chain related. If sounds to me like a rattle within the air intake system. As this is an N52, could this be the DISA valve and does the 2.5si N52 have two or one ? Thx

Thanks for the additional replies. I did the oil change myself and put in bang on 6.5L (exactly what a BMW dealership would do). The dash says the oil is full (i.e. top of the electronic dipstick) and I believe there is an electronic overfill warning anyway - can anyone confirm ? I also did a...

All, Have checked with the specialist and the car was only taken in and a 'quick listen' undertaken. The noise was narrowed down to the front end, probably the timing chain and it was indicated that the 'worst case' could be chain replacement. So not really BS, but a worst case painted that...