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Hi:
I have a 2015 turbo diesel mudd-ox I got from Matt, I did a trade in on an older model, picked it up almost a year ago, in December. In February the exhaust manifold cracked, contacted Matt and he sent me out a new exhaust manifold, I replaced it and now again, 10 months later it has again cracked. It cracked last week and I have not talked to Matt about it yet. Just wondering if any members here have had any issues with their exhaust manifold cracking on their diesel mudd-ox, or any ideas why this is happening?
I'm gonna take a shot in the dark and say improper warmup/cooldown times. If you're in an extremely cold climate and fire the machine up, then go straight to putting any load on the engine without letting everything gradually come up to temp, I'd imagine that would be quite the temperature shock to lots of parts in the engine, especially the exhaust manifold which is much thinner than other components, but experiences all of the heat exiting the cylinders. The same applies to cooldown, if the engine is up to temp, and immediately shut off after use, depending on the ambient temperatures it could be forced to cool down, and therefore contract way too quickly than the metal can withstand. Even if you usually let it warm up and cooldown properly, there could be times you forget about it, and over the course of nearly a year that would take its toll.
Also, I'm not trying to blame you for this, just trying to offer up an explanation. I'm no expert though, hopefully someone else will chime in and confirm or deny what I've said.
yes, the quick heating and cooling can cause premature metal fatigue. some dragsters wrap the manifolds so it won't be too cold in low temps when the engine fires up. then when it's shut down, the cooling process is slower and less stress on the metal. also make sure the manifold is not the only thing supporting the rest of the exhaust system. just a few thoughts. good luck.... j.b.
I would call the manufacturer of the engine and see what they say, could be a design flaw of where the engine is located in a given vehicle. like not enough air flow around the manifold or manifold support. I have noticed over the years working on diesels that they normally crack from extreme heat if they are supported correctly.
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I'm no expert though, hopefully someone else will chime in and confirm or deny what I've said.
