Having changed all the spark plugs on my 3.7 V6 Roadster recently I note they all looked like new after removing. The coil packs allowing access as below are open to the elements. I assume they are similar to those used on the GDI 4 cylinder engines having a thin rubber tapered seal into the plug tunnel and external lip as below. I'm very surprised these seals don't fully waterproof in a similar manner on the GDI engines therefore despite not having the advantage of cylinder heads sitting 30° outboard of the horizontal on the V engine.

[Linked Image]

[Linked Image]

Note just the front left hand bank coil pack was found with the thin seal doubled over on one side from new and requiring a lot of twisting action to remove. No sign of water ingress though. All received a smear of dielectric silicon grease on the seal/tunnel when re-fitted.


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone