Removing and Installing Exhaust Manifold on 4.8-Litre DFI Engines

Removing And Installing Exhaust Manifold On 4.8-Litre DFI Engines

Technical values







Preliminary work
1. Remove engine.
2. Remove primary catalytic converter.
3. Remove turbocharger.

Removing exhaust manifold
1. Spray fastening nuts on the exhaust manifold with anti-rust agent if necessary.
2. Loosen the fastening nuts on the exhaust manifold in reverse order to the sequence shown and remove them. Remove exhaust manifold. Replace nuts.







3. Remove and replace seal. Clean sealing faces. Cylinders 1 to 4, cylinders 5 to 8.










Installing exhaust manifold

INFORMATION:
- Visually inspect exhaust manifold for cracks and distortion.
- A cracked or distorted exhaust manifold must not be reinstalled.
- As a matter of principle, replace seals on manifold.
- Replace the studs in the cylinder head if damaged. Measure the studs with respect to the cylinder head and fit new studs to the same screw-in depth as the old studs.

1. Clean sealing surfaces. The surfaces must be free from foreign objects.
2. Use a new seal (the seal for the turbocharger is also replaced). The exhaust manifold seal must be positioned so that the part number is visible from the outside.
3. Slide the exhaust manifold over the studs and fit it using new fastening nuts. The fastening nuts are tightened in the specified tightening sequence as shown below. - Tightening sequence for exhaust manifold on turbo engine M48/51, cylinders 1 to 4, cylinders 5 to 8.













Subsequent work
1. Fit turbocharger.
2. Install primary catalytic converter.
3. Install engine.