The ears on the waterpump side of my coolant to oil cooler crossover pipe are bent creating a water leak. 2006 duramax.

Welcome to Just Answer, I'm Chris (aka-Moose). I've been an independent contractor here for 13 years, and have gotten pretty good at diagnosis & repair sight unseen. However, I'm not good at sympathy through a keyboard. I do care about you, your vehicle's issues, and the funds you're spending, just not good at showing it. Sometimes I respond above your skill level, am to blunt or rough around the edges, just let me know so I can help you best to your and my ability. I am most often online central time 11-3 midday and 8-3 at night.

If the pump ears are bent and not the pipe then the pump should be replaced. I would not attempt hammering the ears back into shape. I would also straight edge test the flange on the pipe to make sure it is not damaged too. Once the pump is off you should be able to pull and wiggle the coolant pipe to get it to pop out of the oil cooler. That seal should be replaced too.

If any part of my first answer is confusing or needing more detail. Please let me know so I can help more. I want you to receive a 5-star excellent experience and rate as such. Thanks for letting me assist you, Chris.

It should just pull right out, but there are miles and years of coolant sludge packed into the connection. It is a tight fit. I normally pull it towards the fan while hitting the ears with a rubber mallet to get it pulled out.

Going back in, you need to clean up the pipe and hole with steel wool. Install a new seal, lube the seal, hole, and pipe with a smear of engine oil.

Glad to help.