O-Ring seal for Joining socket for water pump housing. Porsche 996 Turbo / 997 Turbo / GT3  ❭  99970741140

O-ring seal for Joining socket for water pump housing, 28.00 x 4.50 mm
The Genuine Porsche 99970741140 O-ring seal is an OE replacement sealing ring for the joining socket on the water pump housing. It helps seal the coolant connection, maintain cooling system pressure and prevent leaks on selected Porsche 996 and 997 models. Ideal for use during water pump, thermostat, coolant flange or joining socket repairs.
Sold individually, 4 required per vehicle

Fits:
Porsche 996 Turbo 2001 - 2005
Porsche 996 GT3 2000 - 2005
Porsche 997 Turbo / GT2 2007 - 2009
Porsche 997 GT2 RS 2011
Porsche 997 GT3 2007 - 2011

Diagram ref no 18

This O-ring fits in the engine cooling system, at the joining socket / coolant inlet flange connection for the water pump housing. It is positioned in the rear engine area where the coolant pipework connects to the water pump housing assembly.

Functions:
•  Seals the joining socket connection at the water pump housing
•  Helps prevent coolant leaks from the water pump housing area
•  Maintains correct cooling system pressure
•  Supports reliable coolant flow through the engine cooling circuit
•  Helps protect surrounding engine components from coolant seepage
•  Provides an OE-quality replacement seal for Porsche cooling system repairs
•  Ensures correct fitment when refitting the joining socket, water pump housing or related coolant flange

O-ring seals can harden, flatten, crack or perish over time due to heat cycles, coolant exposure and engine vibration. Once the seal loses its elasticity, coolant can begin to seep or leak from the joining socket or water pump housing area. Replacing the O-ring with a Genuine Porsche OE seal helps restore the correct sealing performance and reduces the risk of coolant loss, pressure drop or overheating issues. It is also good practice to replace this seal whenever the joining socket or water pump housing is removed.

When to replace
•  When coolant is leaking from the water pump housing or joining socket area
•  During water pump, thermostat or coolant flange replacement
•  When the joining socket is removed or refitted
•  If the original O-ring is flattened, brittle, swollen or cracked
•  During engine cooling system repairs or restoration work
•  When carrying out preventative maintenance on older Porsche Turbo or GT3 models
•  If the cooling system is losing pressure or showing signs of seepage

Where it fits on the car
This O-ring fits in the engine cooling system at the water pump housing area. On the diagram, it is shown as item number 18, sealing the coolant pipe/joining socket connection. It works with the adjoining coolant pipe fittings and sealing components to keep the water pump housing connection leak-free.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99970741140

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