Engine body - Service procedures
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Now close the cock (B). The manometer should not drop for two minutes if the pressure testing device is to be considered reliable.
Submerge the cylinder head in water, temp. approx. 70°C (158°F). 4 Connect the test device to the compressed air supply and open the cock. IMPORTANT! Follow the relevant safety instructions. Do not stand over the expander screws.
Leakage test 1 10 ltr: Fit the clamp 6685 and the expander screws 2124 (2 pcs), see fig. 12 ltr: Fit connecting washer 6683 and the expander screws 2124 (2 pcs), see fig. Do not tighten the wing nuts too hard to avoid damaging the rubber seal.
5 Pull out the circlip for the knob on the reducing valve. Increase the pressure by screwing in the knob until the the manometer shows 50 kPa (7.25 psi). Hold this pressure for one minute, then increase to 150 kPa (21.75 psi). Lock the knob by pressing in the circlip and closing the cock. Check after 1–2 minutes if the pressure drops or if air bubbles escape from the water. 6 Release the compressed air hose. Open the cock and reducing valve. Remove the testing equipment.
2 Check that the knob on the reducing valve is unscrewed and connect the hose from the pressure testing device to the cylinder head.
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