2011 XC60 T6 160k miles seized engine?

aseaz404 · Post by **aseaz404** » 30 Jun 2025, 16:59

Hello everyone, I’m trying to help a neighbor troubleshoot their 2011 T6. Here’s the information I have and possible steps. Please keep in mind that our mechanical abilities are limited to fluid changes and basic suspension items replacement.

Background: the vehicle hit an object that damaged the oil pan. From my discussions it’s unclear if the vehicle/engine was stopped in time (good chance it wasn’t). Vehicle is towed to a shop, oil pan is replaced, new oil added but vehicle cannot be started due to a CEL. Vehicle is now taken to residence for possible part out. I offered to scan with VIDA and the CEL points to no communication with the TCM, there’s also a message on the cluster that the vehicle needs to be in park for it to start. After a bit of reading online I check the TCM fuse, and it’s blown. Replaced the fuse, CEL and cluster message are now gone. In their driveway though I do notice a small puddle under the vehicle and can see a slow coolant leak on the diver side. The leak appears to be directly under the location of the water pump.

Now after confirming that we have coolant and oil at the correct levels we attempt to start the vehicle. The accessories/serpentine belt moves maybe 12 inches, there’s a squeaking noise, a little smoke and the smell of burned rubber. Also, the terminals on the battery are now very hot and I can see a few ounces of coolant seeping out from the top of the water pump. We stopped right there for now as we think that engine or pulleys/pump are seized.

Clearly not knowing enough about what’s going on, and likely being overly optimistic we’re looking for next steps before calling the engine dead. We could use any assistance in assessing our current plan of action. After some reading and YouTube watching we’re thinking of removing the ignition coils and spark plugs to add some engine oil to the top of the pistons and trying to crank again. If that doesn’t yield a better result than the first attempt, in the hope that the water pump and/or pulleys seized, remove or cut the accessories belt to see if the engine will crank.

Assuming that this last step is even a plausible option, I imagine we would do so with a battery charger plugged in since there would be no support from the alternator. Also, should the engine turn successfully, then ignition coils and spark plugs would go back in, and briefly let the engine run. The final step would be to check the oil for metal if we made it this far.

We would greatly appreciate a critique of our plan of action or any recommendations on next steps, besides parting out the vehicle.

Vova585 · Post by **Vova585** » 30 Jun 2025, 18:23

Your logic is correct. If you have time and willingness to do it.
Basic steps- remove all ignition coils and spark plugs. Try to start it via starter. Oil in cylinders would be helpful if your compression would be low from worn pistons rings or from "cylinder wash" basically oil coating on the cylinder walls is gone. If your engine is not turning or there are antifreeze in the cylinders- it can be pronounced dead.

aseaz404 · Post by **aseaz404** » 30 Jun 2025, 20:18

Thanks Vova585, I really appreciate the input. Are my assumptions related to uninstalling or cutting the serpentine belt to remove the pulleys and water pump as variables correct? In the event that the engine does start, will I need an external charger connected to the battery? I also assume it will have to run for a very short time since the water pump will be disconnected.

Vova585 · Post by **Vova585** » 30 Jun 2025, 21:58

T6 engine is not easy to service. You have nothing to loose. Feel free to start with cutting the belt and removing it. Charge battery or put a booster pack(if available) and try to start. If nothing changed-remove the spark plugs and try to start the engine with starter. If it is not turning-....you can offcourse take a borescope and look at the cylinder walls. If you will see deep scratches on them- say "thank you for 160k" and think what you want to do with it next. If you both are up to a challenge-you can try to swap the engine(only if you are bored and have time and money and a place to work on it)
In terms of engine working a short time(10 sec) without coolant flow- will not cause damage.

aseaz404 · Post by **aseaz404** » 30 Jun 2025, 22:03

Thanks again for your posts and info. We should be able to try the steps we outlined in the next week or so and I'll report back.