Boxster S (987) F6-3.4L (2008)
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Risk of damage due to particles of dirt.
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Oil bores/oil ducts can become blocked up.
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When working on the engine, absolute cleanliness is essential.
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Lay removed engine parts on a clean base and cover them without fail.
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Use the cover for dust protection when fitting the engine NR.165 on the engine assembly support.
Identification of housings of camshafts:
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Inlet camshaft:
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Thrust bearing:'E' and matching number on cylinder head/cylinder head cover
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Housing of bearing sleeve: only matching number
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Outlet camshaft:
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Thrust bearing on sprocket:'1A' and matching number on cylinder head/cylinder head cover
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2nd Thrust bearing:'2A' and matching number on cylinder head/cylinder head cover
1. To remove the play from the timing chain drive, turn the crankshaft by means of the pulley or vibration balancer clockwise (running direction of
engine to 60° before TDC : marking U6 on pulley or vibration balancer coincides with fixing bore in crankcase. Fix with locating pin 9595/1.
Assembly of cylinder bank 4 - 6
2. Turn the engine on the assembly support until cylinder bank 4 - 6 stands vertically upwards.
3. Oil the bearing surfaces of the camshafts with new engine oil.
4. Insert inlet camshaft 4-6. Pull the timing chain out of the chain housing of the cylinder head with a welding wire and position on the ring gear of
the camshaft adjuster, at the same time inserting the camshaft at overlapping TDC of cylinder 4 (the cams of cylinder 4 point towards the bulkhead
of the flat-base tappet housing -arrows-).
Note:
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Make sure that the bearing sleeve on the inlet camshaft is positioned correctly.
5. The bearing sleeve of the inlet camshaft must be positioned so that the centrally bored blind hole points vertically upwards -arrow- (the rib of the
cylinder head should also be at the center in relation to the bearing sleeve). In this position, the dowel pin in the bearing bore of the cylinder head
will fit precisely into the opposite off-center blind hole bore. Any other bores are through-holes for guiding the oil .
