Main timing chain tensioner spring for BMW E39

Chain tensioner spring between the crankshaft and the exhaust camshaft,

For Saloon & Touring:
- 520 i M52 & M54
- 523 i M52
- 525 i M54
- 528 i M52
- 530 i M54 It is strongly recommended to replace this part, which wears with time and distance and thus slackens the main timing chain
Easy replacement, with no disassembly of the timing system required
Located inside the chain tensioner