Temperature change causes the engine coolant to expand and contract. The coolant expansion tank gives the expanding and contracting fluid somewhere to go. It is quite common for the plastic tank to split, crack or even burst. If your tank fails it can cause coolant loss and result in major engine damage. A faulty cap can also cause the tank to over pressurize and split.
The cooling system in your car is kept under pressure to raise the boiling point of the coolant. When the coolant system reaches a specific pressure threshold the coolant cap acts as a release valve, vents the excessive pressure, and draws coolant into the expansion tank. When the coolant temperature and pressure decrease coolant is returned from the expansion tank into the rest of the cooling system. The coolant cap, also known as the expansion tank cap or radiator cap should be changed when ever the expansion tank is replaced or a part of any cooling system overhaul. If a coolant cap is faulty and not releasing pressure it can lead to over pressurizing the coolant system. This can lead to splitting the expansion tank.
This Kit Includes
Specifications
Expansion Tank - 17139485733
Coolant Cap - 17117639024
| Opening Pressure |
1.4 bar / 20 PSI |
| Mounting Type |
Screw connection |
| Thread Type |
Inner thread |
| Fitting Position |
For small expansion tank mounted to the side of main tank |
Part Numbers
Expansion Tank - 17139485733
| BMW OE Numbers |
17139485733, 17138610655 |
| topran Number |
503 981 |
| EAN |
4063926416955 |
| Barcode |
1411620000018 |
Coolant Cap - 17117639024
| BMW, MINI OE Numbers |
17117639024, 17132754264 |
| topran Number |
723 102 |
| EAN |
4063926065252 |
| Barcode |
1087040000015 |
Additional Information
Expansion Tank - 17139485733
| Brand |
topran |
| Quality |
Aftermarket + topran parts are quality inspected at HANS PRIES GMBH & CO. KG in Germany in accordance with DIN ISO 9001:2015
|
| Origin |
Made in China |
Coolant Cap - 17117639024
| Brand |
topran |
| Quality |
Aftermarket + topran parts are quality inspected at HANS PRIES GMBH & CO. KG in Germany in accordance with DIN ISO 9001:2015
|
| Origin |
Made in China |
Fitment
| BMW 5 Series F90, G30 (2016-2021) 2.0L 135kW | 520i ! Fitment Restriction: Engine Code: B48 B20 B
|
| BMW 5 Series F90, G30 (2016-2021) 2.0L 185kW | 530e Plug-in-Hybrid ! Fitment Restriction: Engine Code: B48 B20 A
|
| BMW 5 Series F90, G30 (2016-2021) 2.0L 185kW | 530i |
| BMW 5 Series F90, G30 (2016-2021) 3.0L 250kW | 540i ! Fitment Restriction: Engine Code: B58 B30 A
|
| BMW 5 Series G31 (2017-2020) 2.0L 185kW | 530i |
| BMW 6 Series G32 (2017-2020) 2.0L 190kW | 630i |
| BMW 6 Series G32 (2017-2020) 3.0L 250kW | 640i ! Fitment Restriction: Engine Code: B58 B30 C
|
| BMW 7 Series G11, G12 (2015-2021) 2.0L 240kW | 740e, Le |
| BMW 7 Series G11, G12 (2015-2021) 3.0L 250kW | 740i, Li |
| BMW 7 Series G11, G12 (2015-2021) 3.0L 240kW | 740i, Li |
| BMW 7 Series G11, G12 (2015-2021) 3.0L 290kW | 745e, Le Plug-in-Hybrid |
