SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4-cyl. injection engine, mechanics (4- valve) | Engine cylinder head, valve gear

Installation

Check conditions

l	The pistons must not be positioned at TDC.

l	The crankshaft sprocket must be locked to the crankshaft with a bolt and two washers.

l	The camshaft sprockets, locked in the housing with tool -T10016- and secured against involuntary turning.

Note!

On turning the camshafts, the valves can hit the pistons if they are at TDC.

–	Remove sealant remnants on cylinder head and camshaft housing with a commercially available flat scraper or commercial sealer remover.

–	Prevent dirt and sealant remnants from entering cylinder head.

–	Contact surfaces must be kept free from oil and grease.

–	Apply a thin even coat of sealant onto the clean camshaft housing sealing surface. See shaded area on illustration.

Note!

The sealant must not be applied too thickly otherwise excess sealant could enter the oil channels and cause damage to the engine.

–	Ensure all roller rocker fingers contact the valve ends -1- correctly and they are clipped into their respective support elements -2-.

–	Screw two studs (M6 x 70) into cylinder head before installing camshaft housing.

–	Carefully fit the camshaft housing vertically onto the cylinder head studs and dowel pins -arrows- from above.

–	Tighten new camshaft housing securing bolts (evenly from inside to outside using cross-over sequence).

Check that the camshaft housing is not tilted and tighten to a torque setting of 10 Nm + ¹/₄ turn (90°).

Note!

Sealant must be left to dry for approx. 30 minutes after installing camshaft housing.

The rest of the assembly is basically a reverse of the dismantling sequence.

–	Perform the work sequence “Procedure after voltage supply open circuit” → Injection and Ignition System, 4LV; Rep. Gr.24.

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