ar0130p5440rt

Repairing the spark plug thread

Type ar · topic 01.30 · version 0100 · 2005-10-07

Applies to: ENGINE 113.971 in MODELS 251.075 /175

Where it sits

Function group 1 Engine › 01 Complete engine, crankcase ventilation, cylinder head, crankcase › 01.30 Cylinder head — Series 251 (models 075, 175)

EinPAS 15 Engine › 15.16 Cylinder head › 15.16.31 Cylinder head/cylinder head gasket — Series 251 (models 075, 175)

Also applies to engines/gearboxes: 113 971

AR01.30-P-5440RT

Repairing the spark plug thread

21.4.05

ENGINE 113.971 in MODELS 251.075 /175

Repairing the spark plug thread

P01.30-2041-06

Thread tapping unit

Removing/installing

1

Remove cylinder head cover

AR01.20-P-5014RT

2

Remove spark plug

See

Replace spark plugs

AP15.10-P-1580RT

3

Position piston of relevant cylinder to a 20° - 30° crankshaft angle before TDC

Inlet valve and exhaust valve of the relevant cylinder must be closed.

4.1

Remove cylinder head

It is then only necessary to remove the cylinder head if it is not possible to insert the thread tap unit into the spark plug thread for space reasons!

AR01.30-P-5800RT

5

Tap thread in spark plug hole and screw in threaded insert

Pack the swarf grooves of the combination thread tap with grease for bonding the swarf.

Blow out cylinder and spark plug thread with compressed air before screwing in the threaded insert.

AR01.30-P-5440-01B

HELI-COIL repair set

*102589009900

6.1

Crank engine with starter.

If the cylinder head was not replaced, the engine must be cranked several times with the starter.

AR01.10-P-0110RT

7

Caulk threaded insert

AR01.30-P-5440-02B

HELI-COIL repair set

*102589009900

8

Install in reverse order

Repairing the spark plug thread

HELI-COIL repair set

102 589 00 99 00

Referenced documents