BLOG

Bmw 318Ci N42 n46 timing chain replacement

Hi everyone.

The N42 and N46 engine fitted to many different BMW models can be particularly prone to timing chain problems.

The usual culprit is broken guides, caused by the original timing chain tensioner being too short thus allowing the chain to be slack, and rubbing or clattering against the guides. The revised tensioner is longer so keeps the chain tighter, avoiding issues.

Common symptoms are a noisy engine at the front particularly from cold start, misfiring, and error codes for camshaft sensors when the sensors are ok.

Most N42 engines have had a chain by now, but the later N46 still suffers problems with chains, so here’s a brief description of the job being done for anyone that may be interested.

With rocker cover already removed, and camshaft/vanos units removed. Timing chain and guides remove as one unit in the cassette.

IMG_2541.JPG

IMG_2542.JPG

IMG_2543.JPG

New timing chain and guides. You’ll need to swap over your crank toothed pulley.

IMG_2544.JPG

IMG_2545.JPG

IMG_2546.JPG

Timing tools fitted. Crank must be locked at TDC cylinder 1, the tool for this is in the timing kit.

IMG_2548.JPG

Post your comments:


three × 1 =