Since I treated myself to all the parts, I thought I would fix my leaky valve cover gasket and timing chain tensioner while on vacation. Here is a step-by-step DIY, and I've uploaded several pics that hopefully will help others with the same tasks.Parts Needed:Timing Chain Tensioner - Toyota Part 13540-0D010Valve Cover Gasket - Toyota Part 11213-0D040Permatex Ultra Black RTV Sealant (but you can use other sealants)Note: I have a 2001 Chevy Prizm but I buy interchangeable parts with a discount at a local Toyota dealership. Also, the Chevy dealers rarely have the stuff on hand so I don't bother. Toyota always has the parts in stock.Tools I Needed:3/8'' or 1/2'' drive ratchet1/4'' drive torque wrench10 mm deep socket (or regular extension bar)10 mm socket10 mm reversible ratcheting combination wrench (RRCW for short)19 mm socketflathead screwdriverneedlenose pliersjack and jack stand (optional)Time:1-3 hours, depending on skill and speedDisclaimer:These instructions are general guidelines only and may not apply to your vehicle. They worked for me. I assume no responsibility if these procedures do not work for you.