Maintenance Recommendation: for Nimalike-upgraded valve spindles 1. ItemUpgraded valve spindles (type-standard/Stellite) to Nimalike according MWH- remanufacturing procedure V05 and V06 (mainly MC series engines). We provide the following lifetime assurance in diagram form for the Nimalike remanufactured valve spindles on the basis of the following operations and maintenance cycles. 2. Operation conditions The user operates the engine in accordance with the operator’s manual provided by the engine manufacturer. The working and maintenance steps described below are carried out and documented by qualified personnel. The service hours in the following diagram are based on a total of 6.000 hrs/year. According to our experience, the service life (TBO/welding of bottom, head diameter and seat) of a standard new valve spindle is 12.000 hrs. For Nimalike upgraded valve spindles the following is applicable: Operating hours 0 6000 12000 18000 24000 Working steps START A A A B Remarks Service life for new standard valve spindle (average) Service life for Nimalike upgraded V05 / V06-valve spindle (average) www.mwh.de File: Maintenance_Recommendation_Nimalike_Rev04.doc
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Start: Installation of the remanufactured valve spindle together with a new guide bush,new or reconditioned seat ring and sealing set for the stem in accordance with
the engine manufacturer’s installation manual.
Step A:Dismantling and cleaning of the complete exhaust valve, measuring, inspecting
and documenting the valve spindle and seat ring geometry on the MWH data
record sheet (see annexe).
If the seats show signs of pitting (impression >0.05mms) they must be refaced. We
recommend that this work is carried out in our premises according to procedure V09(valve spindle) and V19 (seat ring).
Figure-1: Signs of pitting > 0.05mm beforerefacing