- This wrongfully used term Untempered Engine Especially on 1rz Buses needs reconsideration because guys: 1. An untempered engine is one that youve only been servicing since inception. 2. No bolt or Nut has been touched on the engine 3. Distributor has never been repositioned. 4. Every part on the engine is on Standard 5 . No oil leaks on the See more

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