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  #21  
Old 10-20-2024, 09:05 AM
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Very interesting on the DISA valve. I had it off when I did the plastic coolant pipe under the intake manifold earlier this year and it seemed to work and seal properly then. I'll see if I can get it off and apart today and report back.
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  #22  
Old 10-20-2024, 09:24 AM
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I couldn't wait. DISA valve looks ok and seems to function, doesn't look like any parts have broken off. It's just dirty.
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  #23  
Old 10-20-2024, 10:02 AM
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Is it feasible to pull the engine without the oil pan? In other words, could I essentially leave the cv axles and oil pan in place and just pull the engine? Or am I wishful thinking?

I'm not excited or convinced to swap engines yet...
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  #24  
Old 10-20-2024, 10:11 AM
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I would take off the valve cover next. Try to find a cause before pulling the head off.

I don't really see a big obstacle on lifting up the engine. Well, maybe a good rear point for lifting. Definitely a two man job this way though. I've pulled engines by myself. However, none were a cradle book removal type.

Would a bore scope go all way down to the valves through the intake?
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  #25  
Old 10-20-2024, 10:26 AM
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Think I would see anything with the VC removed? I could see the valves with the intake off but I need to commit before I remove that. Plus I guess the intake has to come off before the engine can be pulled anyway.

Maybe I'll do a compression test on the S52 engine before I do anything to the X5.

I'm reluctant to pull only the head in case the rings let loose.
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  #26  
Old 10-20-2024, 10:33 AM
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Ive never seen a single documented case of an M54 ingesting a DISA pin. If you look at how it's assembled and installed it's clear it's not possible. The only people that claim this can happen are people that sell DISA upgrade kits.


You could pull the engine with the oil pan left behind. I wouldn't, it's going to add a lot of complexity to reinstallation and a little to removal as well

The amount of time spent thinking about it and checking other random things at this point could have just gotten the engine out. It's about a 5-6 hour job. Faster if you have a lift. Hardest part on an X5 is getting it over the radiator core support due to how deep in the engine bay it is. With a lift you drop the subframe and lift the car up over the engine/subframe assembly (the inverse of how they are installed at the factory)

I wonder how many people suggesting you remove just the head have actually removed and reinstalled an M54 head before.

It seems easier to just remove the head because it's only removing "one part" but in reality I think it will take more time and end up being more complicated compared to pulling the engine. Having the engine out will also give you a chance to re-seal the rest of it for new gaskets all around to end up with a nicely refreshed engine.
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  #27  
Old 10-20-2024, 10:39 AM
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I have a lift and have considered dropping the engine that way. At the factory, it's literally the entire drivetrain though, rear axle (brakes diff etc) to front axle with engine trans and t-case, along with radiator.

In my case, if I were to drop the engine from the bottom, what would you drop and what would stay with the body?
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  #28  
Old 10-20-2024, 10:46 AM
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I would drop with transmission but separate the driveshafts so it's just the front cradle you drop. Engine, transmission, front diff will come out. Then split the trans and if you want to remove oil pan you can do that, with the subframe dropped you have good access to make reinstallation easier.

With a lift it's a few hour job, just a little longer if you've never done it before and really take your time.
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  #29  
Old 10-20-2024, 10:56 AM
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So basically, transfer case, transmission, engine, and entire front subframe with steering gear front struts/brakes etc would drop, the rest would go up with the car body?

I'll need to remove exhaust, drive shafts, AC compressor, steering shaft from gear, wires/harness connections, transmission cooling lines, radiator connections, oil cooler lines, etc.
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