Just fix it... the rebuild kit is like $50 and is available on this site.

http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1987%40%401987&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6213%3AED|10000100%3AMBC|1512%40%40300SDL&keyword=mono&subcatid=P:242328@@Mono%20Valve%20Repair%20Kit&mode=PA

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.