SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4 cylinder injection engine (1.6 l engine, roller rocker arms) | Engine cylinder head, valve gear

Support elements with hydraulic compensation: Check

Special tools and workshop equipment required

Calibre

Note

t	Replace hydraulic cam followers as a set. (They cannot be adjusted or repaired individually.)

t	An unusual sound from the valves while starting the engine is normal.

Checking sequence

–	Start engine and run until the radiator fan has switched on once.

–	Increase engine speed to about 2500 rpm for 2 minutes: if necessary, perform road test.

Note

If the irregular valve noises stop but recur repeatedly during short trips, replace the oil retention valve on the oil filter bracket . → Item

If the hydraulic compensation elements are still noisy, determine the defective element as follows:

–	Remove cylinder head cover → Chapter

–	Turn crankshaft until the cams for the support element to be checked stand on the top. To do this move the vehicle forwards in 4th gear with ignition switched off.

–	Determine clearance between cam and roller rocker finger.

–	Push roller rocker finger with screwdriver downwards -arrow-.

If an 0.20 mm feeler gauge can be inserted between camshaft and roller rocker finger:

–	Renew support element → Chapter ; Camshaft: removing and fitting.

Note

t	After installing the camshaft wait for approx. 30 minutes before starting engine. The hydraulic valve compensation elements will have to settle (otherwise, the valves could rest on the pistons).

t	After working on the valve gear, turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is operated.

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