The plastic guiderail of a Mercedes is also known as the timing chain guiderail. This is an important part of the engine that mainly functions to keep the correct path and position for the timing chain. This ensures that it runs properly by stopping it from shifting out of its place. It acts as the track for the timing chain and is vital for the engine’s operation and synchronization.
A plastic guiderail failure is a common problem in Mercedes models, the older models in particular. The problem is caused by heat and stress from the Mercedes engine and will cause the timing chain to move out of place, which can cause serious engine damage if not addressed promptly. Some of the consequences of waiting too long to get your plastic guiderail fixed are engine performance issues such as damage to other engine components and misfires.
At Momentum Motorworks, we have 21 years of experience with German automobile service with brands like Mercedes. Allow our certified experts to solve your plastic guiderail failure and get you back on the road.
To stop the plastic guiderail from failing prematurely, we recommend that proper routine maintenance be done. While getting your oil changed at the recommended time, every 20,000 miles or 2 years, it is important to hail the correct grade of oil used. We also will have our mechanics inspect the timing chain and guiderails during service. If you need to get your vehicle’s plastic guiderail replaced, we will only use high-quality parts to help the life expectancy last.
The Function of the Plastic Guiderail in Your Mercedes
In a Mercedes, the plastic guiderail is a critical component within the engine. The guiderail acts like a track to guide the timing chain and makes sure that it will smoothly rotate and be aligned correctly around the camshafts. The plastic guiderail will prevent the timing chain from misaligning or jumping around. This is important for the engine to maintain the correct performance and timing.
The design is made of plastic, but it was made to withstand the high pressures and temperatures from inside the engine. Over time the material can degrade, though, and this leads to potential failure if not maintained right.
- Material: The guiderail is made from plastic. This is a common material for this specific component due to its ability to dampen vibrations and how cost-effective it is.
- Location: The plastic guiderail is alongside the timing chain within the engine.
- Function: The plastic guiderail guides the timing chain of your Mercedes. It ensures that it rotates in the proper path and allows the crankshaft and camshaft of the engine to operate in sync.
What Causes a Plastic Guiderail to Fail?
At Momentum Motorworks, our master technicians can diagnose what may be causing the plastic guiderail to fail in your Mercedes. The following causes are what we see as the main culprits to guiderail failure.
- Heat exposure: The plastic guiderails can warp, melt, or become brittle over time due to the extremely high temperatures the engine bay can reach.
- Poor maintenance: By not maintaining your Mercedes with regular oil changes, there can be sludge buildup, which will deteriorate the plastic guiderail much faster.
- High mileage: At higher mileage, the guiderail will become more brittle due to wear and tear, which increases the risk of it failing.
- Aggressive driving: Additional stress can be put on plastic guiderails because of driving at high speeds often. This will generate more heat in the engine and can cause the guiderail to become worn prematurely.
- Rough road conditions: Engine components like the plastic guiderail can be put under excess stress due to you driving on rough roads.
How Our Technicians Can Fix Your Vehicle’s Plastic Guiderail
The plastic guiderails in your Mercedes 
are significant parts of your engine. They are in charge of keeping the timing chain aligned correctly in the engine. If the guiderails fail, it can lead to the timing chain hopping off its sprockets, which can cause serious damage to the pistons and valves in the engine.
At Momentum Motorworks, our technicians recommend replacing the damaged plastic guiderail with a brand new one. We don’t recommend trying to do this repair yourself because the fix requires a skilled mechanic with experience working on Mercedes vehicles. Our master technicians will have to access the timing chain area and then remove the old guiderail. After that, they will install the new plastic guiderail. Due to the complex nature of the components in this area, you may also need a complete timing chain replacement as well. Our technicians will ensure that the guiderail is installed properly so future issues can be avoided.
At Momentum Motorworks, we are known for providing drivers with reliability, performance, and a higher standard of comfort. Our technicians make sure you know exactly what your car needs and will provide you with all the information you need to make the best decisions possible for your Mercedes. We serve residents in Birmingham and the surrounding areas.
- Alabaster, AL
- Homewood, AL
- Helena, AL
- Hoover, AL
- Mountain Brook, AL
- Vestavia, AL
- Birmingham, AL
Stop by our shop in Birmingham to schedule an appointment or call us at 205-403-4626. Choose Momentum Motorworks to fix the plastic guiderails of your Mercedes. We believe that quality should always come first.
* White Mercedes-Benz C-Class Car image credit goes to: Artistic Operations.