Valves are supposed to be adjusted every 18,000 miles. 40,000 is way over the limit.

Use a mechanic's stethoscope and see if the vacuum pump is ticking. If it is, time for a rebuild. A bad vacuum pump can take out a timing chain.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K