Removing Camshaft Housing - GT3

Removing camshaft housing - GT3




Tools - overview




Components, exploded view




Designations and notes

Preliminary work:
- Remove exhaust system
- Remove intake distributor
- Remove oil container
- Remove oil/water bracket
- Remove coolant guide housing
- Remove bracket for generator
- Remove spark plugs





1. Remove oil extraction pump.
To do so, unscrew the fastening screws and remove the oil extraction pump. Unscrew the three screws on the closure cap and remove the cap.





2. Set engine to top dead center.
To do so, only push the generator bracket into place. Set engine to top dead center. Turn the engine using the belt pulley in running direction until the TDC markings on the belt pulley and on the generator bracket coincide. Remove bracket for the generator.





3. Remove valve cover.
Unscrew the valve cover screws (17 pieces) and remove the valve cover. If the valve cover is stuck, loosen it by gently tapping with a plastic hammer.





4. Relieve camshaft.
For any further work, it is sensible to turn the engine in such a way that the camshafts do not press on the valves.
With cylinder bank 1-3, the cams of the first cylinder should point outwards and diagonally upwards.
With cylinder bank 4-6, the cams of the fourth cylinder should point outwards and diagonally downwards.





5. Relieve the timing chain.
In order to relieve the timing chain, the chain tensioner and the guide rail between the camshaft sprockets must be removed. Remove both the hexagon-head bolts of the chain tensioner. Remove the chain tensioner cover and the chain tensioner.





6. Remove the guide rail.
Remove the three hexagon-head bolts on the upper guide rail between the camshaft sprockets and remove the guide rail.





7. Remove the chain sprockets of the camshafts.
When removing the chain sprocket of the inlet camshaft, the former must be held with special too[ No. 9653 as shown in the diagram, in order to prevent the timing chain from being burdened. Stop the chain sprocket of the exhaust camshaft with special tool No. 9653/1. First remove the chain sprocket of the exhaust camshaft, then the adjuster of the inlet camshaft.





8. Remove oil guide housing.
To do so, unscrew the three hexagon socket head bolts and remove the oil guide housing forwards. The left and right oil guide housings are of different lengths. If the Oil guide housing is stuck, loosen the thrust bearing cover.





9. Remove the thrust bearing cover.
In order to remove the thrust bearing cover of the camshafts, unscrew the remaining six hexagon-head bolts and remove the thrust bearing cover forwards.





10. Removing camshafts.
Unscrew the fastening screws of the six camshaft bearings alternately in 1/2-turn steps in the given order, until the camshaft is completely free of tension. If the bearing saddles are stuck, loosen them with a light tap at the side with a screwdriver handle.





11. Remove camshaft bearing saddles.
Lift the camshaft bearing saddles up and off. The bearing saddles must not be exchanged or twisted under any circumstances. Therefore it is sensible to sort the bearing saddles. The bearing saddles possess a matching number to the respective cylinder head and an identification showing the installation position. Lift the camshafts carefully up out of the camshaft housing.





12. Remove the flat-based tappets.
Pull the flat-based tappets upwards out of the cylinder head. In order to avoid confusing the corresponding flat-based tappets, lie them on a prepared sheet of paper as shown in the diagram.





13. Remove the camshaft housing.
Unscrew the 18 hexagon-head bolts of the camshaft housing. Unscrew the camshaft housing bolts as shown in 1/2-turn steps from the outside inwards.
14. Remove the camshaft housing.
Remove the camshaft housing upwards, moving it evenly and without tilting. Make sure that the flat-based tappet guides are not damaged.
15. Remove the seals.
Remove the seal between the camshaft housing and the cylinder head. Do not use the seal again.