G14.20-3120-08
1 | EGR line downstream of exhaust gas recirculation cooler | 2 | Gas recirculation hose | 3 | Latch |
G14.20-3121-09
Shown on engine 471.9 |
4 | EGR line upstream of exhaust gas recirculation cooler | 6 | Flange | ||||
5 | Exhaust gas recirculation cooler | 7 | Pressure pump |
G14.20-3122-09
Shown on engine 470.9 |
4 | EGR line upstream of exhaust gas recirculation cooler | 6 | Flange | 8 | Bracket (only with secondary coolant-retarder) | ||
5 | Exhaust gas recirculation cooler | 7 | Pressure pump |
Warning | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
Warning | Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant. | Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. | |
Warning | Risk of injury. Skin or eye injuries may result when handling hot or glowing objects. | Wear protective gloves, protective clothing and safety glasses, if necessary. | |
Topical note | Notes on self-locking nuts and bolts | ||
Topical note | Notes on avoiding damage through contamination and foreign objects | ||
| Remove | ||
1 | Remove bracket (8). | Only for secondary coolant-retarder. | |
2 | Release overpressure in cooling circuit by opening cap at coolant expansion reservoir. | See information from body manufacturer. | |
3 | Remove exhaust gas recirculation line downstream of exhaust gas recirculation cooler (1). | ||
4.1 | Remove air filter with carrier. | In case of engine without air intake, from front. | |
Clamp, air intake hose to turbocharger | |||
4.2 | Remove air intake hose. | In case of engine with air intake, from front. | |
5 | Remove exhaust gas recirculation line upstream of exhaust gas recirculation cooler (4). |
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Engine 471.9 | |||
| Check | ||
6 | Install plug (3) at exhaust gas recirculation hose (2). | | |
Exhaust gas recirculation hose (2) must be clean on inside and clamp must not be damaged. Clean exhaust gas recirculation hose (2) on inside if necessary and/or replace clamp. | |||
Clamp, exhaust gas recirculation hose to exhaust gas recirculation cooler or exhaust gas recirculation line | |||
Leak tester | |||
7 | Install flange (6) at exhaust gas recirculation cooler (5). | Screw/bolt, exhaust gas recirculation line clamp to exhaust gas recirculation cooler | |
Leak tester | |||
8 | Install pressure pump (7) at flange (6). | | |
Pressure pump | |||
9 | Apply compressed air to exhaust gas recirculation cooler (5) by means of pressure pump (7) and immediately afterwards spray leak detection spray on connecting points of test tools and separating points of exhaust gas recirculation lines. | | |
The connecting points must always be sprayed with leak detection spray immediately after being applied with compressed air, as this volatilizes very quickly. | |||
10 | Observe display on pressure pump (7). | During the test, check whether leaks may exist at the parts previously sprayed with leak detection spray. If necessary, eliminate leaks via cleaning, reconnection or replacement of damaged parts. | |
Pressure drop in exhaust gas recirculation cooler | |||
If a pressure drop is detected, | |||
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replace exhaust gas recirculation cooler (5). | |||
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11 | Remove plug (3), flange (6) and pressure pump (7). | ||
| Install | ||
12 | Install exhaust gas recirculation line upstream of exhaust gas recirculation cooler (4). |
| |
Engine 471.9 | |||
13.1 | Install air filter with carrier. | In case of engine without air intake, from front. | |
Clamp, air intake hose to turbocharger | |||
13.2 | Remove air intake hose. | In case of engine with air intake, from front. | |
Clamp, air intake hose to turbocharger | |||
14 | Install exhaust gas recirculation line downstream of exhaust gas recirculation cooler (1). | ||
15 | Close cap at coolant expansion reservoir. | See information from body manufacturer. | |
16 | Install bracket (8). | Only for secondary coolant-retarder. | |
17 | Start engine and perform an engine test run. | Allow the engine to run at a higher engine speed. | |
18 | Check area of exhaust gas recirculation cooler (5) for leaks and switch off engine. | Visual inspection |
124 589 24 21 00
Pressure pump
470 589 07 91 00
Leak tester