This document outlines common issues experienced with D4D engines, along with potential solutions implemented by Toyota.
Problem 1: Transmission Clunk
A “clunking” noise originating from the transmission area has been observed in some models.
Solution:
- Initial Attempt: Re-greasing the tail shaft.
- Definitive Solution: Replacement of the tail shaft.
Problem 2: Cold Start Engine Noise (“Rifle Shot”)
A loud, sharp noise occurring during cold starts has been reported.
Solution:
- Replacement of all injectors and “dump pipes.” Note: the exact function of the “dump pipes” was not specified.
- ECU Remapping.
Note: Toyota indicated that this solution was still under evaluation at the time of the original repair.
Problem 3: Vibration Between 1000-2000 RPM
A vibration felt within the specified RPM range.
Solution:
- Replacement of engine mounts. This was the proposed solution at the time of reporting. The efficacy of this solution isn’t confirmed within this document.
Relevant Parts
- Tail shaft (complete replacement)
- Fuel Injectors (complete set)
- Engine Mounts (complete set)
- “Dump Pipes” (Exact specifications and part numbers not provided)
This technical summary was auto-generated based on recovered archives. Do not rely on its factual accuracy. Refer to the original thread. Source: View Original Conversation
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