08/06/2025
This 2012 BMW 320d F31 Touring was in with us recently for our popular N47 timing chain service. The owner hadn’t had the car long and did have a written receipt for a timing chain change, however when they contacted the garage to question this the garage couldn’t confirm if it had been done or not. So with this in mind they wanted to ensure it had definitely been done, and done properly.
We got the car up on the ramp and could see that there was evidence that someone else had been in there before due to the amount of sealant around the timing chain cover area. Being completely transparent with our customer we let them know and gave them the option of if they wanted us to continue or not. We did also find a dubious repair to the sump which worried us a little as to how the rest of the previous work had been performed. Our customer was happy for us to continue the work regardless.
The timing chain components had indeed been changed previously however a low quality BGA timing chain kit had been used. In addition to this as previously mentioned before, the sump had been repaired poorly with chemical metal and the amount of sealant used on the work was excessive to say the least, so much so that bits of it had found its way into the oil pump pickup pipe which could have led to oil starvation. All this being said, the engine internally was very clean for its 140k mileage so had clearly been looked after and regularly serviced throughout its life.
Whilst we were carrying out the work we also noticed that the oil filter housing gaskets were leaking, another common issue on the N47/N57 engines. Customer asked us to replace these together with sourcing a replacement sump.
As always, we used the tried and tested reliable OE IWIS timing chain kit together with a genuine rocker cover & oil filter gaskets to complete the work. Once the mechanical work was finished we cleaned the engine bay and gave the whole vehicle a complimentary valet.
Our customer was regularly kept updated through pictorial evidence of our work and our findings. All components were meticulously cleaned before being refitted.
Please get in contact if you'd like us to work on your pride and joy.