SEAT Workshop Service and Repair Manuals

Checking compression Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter. Special tools and workshop equipment required

t  Extension and socket -3220-, see equivalent → Anchor

t  Compression gauge -VAG 1763- with Adaptor -V.A.G 1763/8- t  Torque wrench -VAG 1331-, see equivalent → Anchor. Test condition l  Engine oil temperature: approx 80 ℃. l  Battery voltage min. 12.5 V

Checking sequence –  Loosen the engine cover at the locations -arrows- and remove.

–  Detach electrical connectors on the fuel pressure regulating valve -N276--arrow- on fuel rail.   Caution Make sure that no wiring connections are damaged when disconnecting the connectors. Otherwise the whole wiring harness will need to be renewed. Do not press the pliers -3314- too firmly together to separate the connectors, otherwise the support sleeve may be damaged. –  To dissipate fuel pressure in fuel rail start the engine briefly. –  Remove glow plug from relevant cylinder using U/J extension and 10 mm socket -3220- → Chapter.

–  Screw in adapter -V.A.G 1763/8- in place of the glow plugs and connect compression tester -V.A.G 1763-.   Note Use of the testing equipment → Instructions. –  Have a second mechanic operate starter until tester shows no further pressure increase.

Compression pressure	bar
new	25,0 … 31,0
Wear limit	19,0
Maximum difference between cylinders	5,0

Installation is carried out in the reverse order; note the following: –  Install glow plug using U/J extension and 10 mm socket -3220- → Chapter. –  Read out the event memory of the engine control unit on the → vehicle diagnostic tester .   Note By detaching the injector connectors error entries are registered in the event memory. The event memory must therefore be interrogated and existing entries deleted if necessary.