S54 Upper Chain Guide
- Buy 5 for £85.50 each and save 10%
The S54 engine, found in both E46 M3 and Z4M, suffers from the upper chain guide breaking as shown below. We have seen this for the last 10 years and it’s a contributing factor to the timing chain stretching.
We have modelled a new part to replicate the shape, but removed the inherent fault within the factory part.
Other aftermarket guides are available but have found upon inspection they have wear on the running surface caused by the chain, within 500 miles. This is something that doesn’t happen on the factory guide.
Our choice of material contains finely divided particles of molybdenum disulphide to enhance its bearing and wear behaviour, without impairing the impact or fatigue resistance inherent to unmodified cast Nylon grades. It is very commonly used in the manufacture of guides, gears, bearings, sprockets and wear plates.
It's as good as any material we know for this application.