Technical data: TD/TAD420VE, TAD620VE, TAD650VE, TAD660VE
14
Group 20
• Set the dial gauge in the level of the crankcase surface to ”zero”.
• Position the dial gauge at the measuring points A and B on the top of the piston,
inline with the gudgeon pin.
• Measuring points between A and B on each piston is the distance X.
• Measure all pistons.
• Determine the maximum projection on each piston.
The highest piston projection number, determines the thickness of the cylinder head
gasket. The different head gaskets are identified by the hole identification on each of
the three different thickness available, see picture below.
Measuring points, distance X: ............................. Ø 90 mm (3.5")
Cylinder head gasket
Measuring piston projection
A dial gauge with a fixture (special tool: 999 8678) is needed to measure
the piston projection. The piston is in its TDC above the block surface.
Identification
1 Hole .................................................................... 0.33 – 0.55 mm (0.012" – 0.021")
2 Holes .................................................................. 0.56 – 0.65 mm (0.022" – 0.025")
3 Holes .................................................................. 0.66 – 0.76 mm (0.026" – 0.03")
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