# Liebherr D9508 A7 Engine Overhaul

> Discover the detailed process of a major overhaul of the Liebherr D9508 A7 engine from a Liebherr R974C crawler excavator. Learn about the repair kits used, the condition of the crankshaft and camshaft, the replacement of injectors and pumps, and the regeneration of various parts. Find out how the engine was tested post-repair.

### Liebherr D9508 A7

**In our workshop, a repair of the Liebherr D9508 A7 engine was carried out, which comes from the Liebherr R974C crawler excavator.**

The engine came to us immediately after detecting a fault that qualified it for a major overhaul. We rebuilt it based on new repair kits containing sleeves, pistons, rings, and pins with safeguards.

### Course of the repair

In addition, from the basic elements, main bearings, bearings and connecting rod bushings were installed. The crankshaft and camshaft were in surprisingly good condition and after polishing could be reinstalled.

In the fuel system, new injectors and a new high-pressure pump were installed. The engine cooling system received a regenerated water pump and new thermostats. Worn oil pumps were also replaced with new ones.

In addition, the following were regenerated: connecting rods, cylinder heads, turbochargers, and the starter.

The entire engine was assembled on a new set of seals, gaskets, and filters.

After the repair, the engine was checked and preliminarily run-in on the engine dynamometer in our workshop.

Published: 2024-03-21

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Source: https://wibako.com/about-us/news/83-liebherr-d9508-a7-engine-overhaul
Contact: +48338704200, biuro@wibako.pl