Porsche Water Pump Repair

28 Oct Porsche Water Pump Repair

Porsche Water Pump Repair

The water pump or more specifically the coolant pump is a critical component that is vital to the health of your water-cooled Porsche engine (all cars built after 1998;  986 , 987 Boxster, Caymen, 996, 997, 911, 991,  Cayenne, and Panamera) .  It is responsible for maintaining the engine at optimal operating temperature to allow the engine oil to properly lubricate components, prevent cylinder head gasket failure, and overheating of cylinder heads and crankcase, which can crack from high heat. The water pump is driven by a Poly-Ribbed Drive Belt, which also drives the Alternator, the A/C Compressor, and the Power Steering Pump. Porsche uses a water pump with a plastic/composite type impeller. The composite impeller has less rotating mass and therefore requires less engine power to drive the coolant pump. This style of impeller actually lasts longer and is more reliable than metal versions.

In most cases, when the water pump fails, the impeller breaks apart due to old age or the seal at the impeller. A common symptom will be a Porsche engine that starts to overheat or run hot, and no coolant leaks are visible. (Warning: You should never let the engine or coolant temperature gauge climb more than slightly past the center point. If it does, shut down the car immediately and have the cooling system inspected or diagnosed.)  Often, the failure of the impeller will lead to the coolant pump impeller shaft rotating out-of-balance and as a result take out the water pump shaft bearing and its seal. When the seal and/or bearing leaks, you will often find coolant dribbling or leaking from behind the water pump pulley. If the owner continues to drive his Porsche, the pump shaft and pulley will eventually start wobbling and the Poly-Ribbed Drive Belt will come off the pulley or shred and get wrapped around the alternator or A/C Compressor Clutch and damage them. At the same time, there is often a catastrophic loss of coolant. Immediately stop the engine and have the vehicle towed. Do not continue to drive the Porsche without coolant. You will cause catastrophic engine failure.

Failed Porsche Water Pump Impeller Shaft Seal

Failed Porsche Water Pump Impeller Shaft Seal

The technician who repairs your Porsche should check for missing pieces of the impeller in the coolant pump and remove and check the thermostat assembly. At this point, the thermostat should be replaced along with the water pump, especially if the engine has overheated. If not all the pieces of the can be found, then the radiators, coolant pipes, and engine need to be back flushed (coolant flushed).  The lost debris may clog small passages in other areas of the cooling system, and can cause localized over-heating or damaging hot spots in the engine which won’t be recognized by the coolant temp gauge or sensor.

Phone: 408-370-7480

– OUR MISSION –

RennWerks Performance celebrates the glory of the automobile in all its forms. We take pride in caring for our customers, and are invigorated by the opportunity to provide competent and comprehensive automotive repair services. We strive to be the leading repair, tuning, and race facility in the San Francisco Bay Area while providing you personalized, detailed, and friendly service. Our relationships are built on trust, communication, integrity, and commitment to our purpose; to be the best shop we can be to you, the customer.

To schedule an appointment for major or minor service, please contact service@rennwerks.com or 408-370-7480. We welcome you to stop by our shop at 1070 Dell Ave Campbell, CA 95008. If you have any questions about your auto’s performance or maintenance, don’t be shy about asking our friendly staff for assistance.