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1986 944 Rod Bearing Failure Aftermath

Engine

Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): 2.5; Total Mileage: 90k;

I am having the engine rebuilt after a rod bearing failure. The workshop manual recommends replacing the hydraulic tappets, pressure relief valve, pressure reducing valve and the oil cooler.We found that there was a lot of metal chips in the cooler so we are replacing this part. What is your opinion on the 2 valves and tappets?Also, any recommendations on the cleaning procedure aside what is in the manuals.

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