Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
41 00... Installing A Cavity Sealing With 2-Component PU Cavity Foam: Notes
Sourcing reference for cavity foam (refer to BMW Parts Department).
The following repair represents the replacement of a shaped part for the cavity sealing by the use of cavity foam.
This type of cavity sealing is used at points at which shaped parts cannot be used for repairs.
This is the case when large amounts of heat occur (e.g. due to welding, soldering or tin-plating) in the direct vicinity or at the point of the standard cavity sealing.
It is not possible here to install shaped parts for the cavity sealing because of the fire risk!
To replace shaped parts with cavity foam at further locations, adopt the procedure shown here and adapt it to the relevant ratios.
It must be ensured that the cavity is completely sealed off.
Properties of cavity foam:
- 2-component PU foam, solvent-free.
- Excellent flow capacity, enabling complete sealing of cavities.
- Good strength, preventing slipping in cavities.
- Low water absorption, preventing corrosion.
- Ideal for use as insulating and sealing compound.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.