What to know about the Automatic Timing Advance Unit:
Gasoline and diesel engines may seem alike, and they do work on the same basic principle of combustion, but they’re very different. They need considerably different steps taken to control fuel flow throughout engine operation. Diesel fuel takes longer to combust than gasoline, and in an operating engine, combustion can take place well after the timing hits top dead center (TDC). If this occurs, then it generates lag, which has a negative impact on engine performance. To combat lag, diesel must be injected before the timing reaches TDC to provide enough time for combustion to take place. This job is controlled by the automatic timing advance unit. Essentially, the unit ensures that no matter what speed the engine is working, fuel is injected with ample time for combustion to occur before TDC is reached.
The automatic timing advance unit should be located on the fuel pump itself, and is operated by the engine’s primary drive gear.
Facts to Note:
The automatic timing advance unit is not examined during maintenance, and will only be checked if there is a problem with the fuel delivery.
The automatic timing advance unit is subject to a lot of wear and tear, particularly if you accelerate harshly, or drive regularly.
How to Fix:
The automatic timing advance unit is proved that it needs to be changed. The battery is then disconnected.
The injection pump front cover is removed and gear location aligned and marked.
The center bolt is detached and then the defective automatic timing advance unit is taken out.
The new advance unit is fixed and the gears are aligned. The center bolt and cover are reinstalled. The battery is reconnected.
The engine is started and the automatic timing advance unit is tested to ensure proper operation.
Without an operational automatic timing advance unit, your diesel engine will not have a reliable fuel supply at all speeds, which causes serious problems. If you suspect a problem with your automatic timing advance unit or have similar symptoms, have one of our expert mechanics inspect and diagnose the problem.
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Common symptoms indicating you may need to change the Automatic Timing Advance Unit:
Severe engine knock
Sluggish engine operation
White smoke from exhaust
Significant amounts of black smoke from exhaust (more smoke is normal for a diesel)
Importance of this service:
The automatic timing advance unit is vital for safe and reliable engine operation. If the unit begins to fail or fails totally, serious engine damage can result. If you have observed any abnormal operations in term of sluggish performance or smoking, have the problem analyzed immediately by one of your expert mechanics.