Auspressen? Ivch hab an meinem M70 V12 Motor schon welche gewechselt, da hab ich nichts ausgepresst. Denn die sind ja voll wenn neu.
Beim Start nach längerem Stillstand des Motors können typische Klappergeräusche auftreten, wenn die Hydrostößel teilweise „leergelaufen“ sind. Die Geräusche verschwinden in der Regel nach wenigen Sekunden, sobald die Stößel wieder vollständig mit Öl gefüllt sind. Deshalb wurden auslaufsichere Hydrostößel entwickelt, die zuerst bei BMW zum Einsatz kamen.
Einfahranleitung aus dem Engine Rebuilder Magazine
Repair
Run the engine to dissipate (bleed) the air trapped in the high pressure chamber ofthe HVA elements. Refer to the HVA bleeding procedure described below.
HVA Bleeding Procedure:
• Check oil level – correct if necessary.
• Let engine idle at operating temperature with the hood open to verify valve train tapping/rattling noise.
• If a tapping/rattling noise can be heard from the valve train, run the engine for 3 minutes without load at approximately 2,500 to 3,000 rpm (bleeding procedure).
• Then with the engine at idle listen for valve train noises again.
Note: Only listen for noises when the engine has reached minimum oil pressure, i.e. after a waiting period (at idle) of approximately 15 – 30 seconds.
• If no more noises can be heard, the test procedure is complete. No further action is necessary, the engine is working properly.
• If the tapping/rattling noises can still be heard, the bleeding procedure must be repeated (run the engine for 3 minutes at 2,500 – 3,000 rpm).If necessary, repeat this procedure up to five times.
• If the tapping/rattling noises can still be heard, the bleeding procedure must be performed one final time for approximately 15 minutes.
• If no more noises can be heard, the test procedure is complete. No further action is necessary, the engine is working properly.
If the tapping/ rattling noise is still heard after performing the above HVA Bleeding Procedure the following scenarios will assist in further troubleshooting for HVA element noise:
If the noise is coming from all HVA elements an oil supply problem is the most likely cause.
Check engine oil pressure as outlined in the appropriate repair manual.
If the oil pump pressure (at idle = minimum pressure or regulated =maximum pressure) is below specification a visual inspection of the oil pump and oil pump pick up in the oil pan should be performed with emphasis on the pick up gasket and control valve O-ring were applicable.
Note: A faulty oil pump control valve O-ring or oil pump pick up gasket (slight tear in O-ring or gasket) may not always result in a low oil pressure indication when performing an oil pressure check. The air drawn in to the lubrication system via a defective gasket or O-ring will cause oil foaming and HVA tapping/rattling noises.
If the noise is still coming from an individual HVA element after performing the above HVA Bleeding Procedure the suspected element(s) can be isolated as follows:
• Remove cylinder head cover.
• Turn the engine over (normal direction of rotation) until the camshaft lobe ofthe HVA element to be checked is pointing away from the HVA element (engine valve completely closed).
• Repeatedly apply a force ofapproximately 2.25 ft.lbs to the HVA element with your thumb or using a folding arm tool BMW special tool number 90 88 6 009 321 (included in the BMW assembly wedge kit P/N 90 88 6 009 310) or a hard wood wedge.
http://www.enginebuildermag.co…c-bucket-tappet-problems/