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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Have i ruined my Engine



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      06-29-2018, 01:07 AM   #1
Fattyboombatti
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Have i ruined my Engine

Hi Guys

The Large Disa Valve on my intake manifold failed last Friday.

I originally suspected it was a bad coil or spark plug as the code reader said misfires on cylinder 6 and i changed those without issue. However the issue still persisted and lead me to forums which suspected a broken disa valve which is correct.

Mine had fell apart and i now have bits of plastic and probably a metal spindle going nuts in my engine (and or manifold) and there is around 40 PSI on cylinder 6, i believe is should be around 140psi after taking it to a local independent BMW garage.

The car has done around 150k miles and is a e90 325i n52 2.5l 07 plate.

is it worth time and money replacing it and is it a job that can be done as a DIY?

Cheers

Matt
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      06-29-2018, 02:34 AM   #2
tlow98
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Id definitely take the intake cover off to confirm.
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      06-29-2018, 03:36 AM   #3
RocketSurgeon
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Yeah, definitely confirm first. USB borescopes are dirt cheap, I think I'd want to take out the spark plugs and take a peek. While you have the plugs out, run a compression test across all six cylinders to confirm.
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      06-29-2018, 08:05 AM   #4
robthewrench
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The PSI on cylinder 6 should be much higher. over 100. I would check the compression again, just to confirm. You could also pull the valve cover to see if there is any obvious damage to the valves on cylinder 6.

However, at 150k miles, a head rework is not really a good investment. Sorry to say that while it is possible to fix valve damage, it is not financially a good move. Removing, rebuilding, and re-installing a head is not a DIY level type job.

If the damage is in the cylinder wall, the engine is done for.

Sorry to give you bad news, I hope that this can help.
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      06-29-2018, 09:33 AM   #5
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This was a very common issue on the E46. The plastic won't hurt the engine if it gets sucked in but the metal pin will. Keep us updated; hoping for the best.
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      06-29-2018, 11:41 AM   #6
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Quote:
Originally Posted by robthewrench View Post
The PSI on cylinder 6 should be much higher. over 100. I would check the compression again, just to confirm. You could also pull the valve cover to see if there is any obvious damage to the valves on cylinder 6.

However, at 150k miles, a head rework is not really a good investment. Sorry to say that while it is possible to fix valve damage, it is not financially a good move. Removing, rebuilding, and re-installing a head is not a DIY level type job.

If the damage is in the cylinder wall, the engine is done for.

Sorry to give you bad news, I hope that this can help.
this.

a decent condition used head is still 5-600 dollars.
you'd be into it for near a grand just to swap a used head on it yourself, after you replace all the stuff you should replace because you're there.

If the cylinder wall or piston is damaged, it's over.
Would second a USB borescope through the plug hole to look for damage.

Maybe you get lucky and it's just a stuck valve from a plastic bit in the seat.
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      07-04-2018, 11:03 PM   #7
Fattyboombatti
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thanks for the reply guys

seriously i am still in mourning over this, loved the car and wish i read up on this DISA Valve bollocks long ago..

i forgot to add that after i replaced the spark plug on cylinder 6 it was damaged by the time i got to the garage and he removed it.

i am going to keep the car, just out of curiosity it is a simple swap if i replaced it with a n52b30a, rather than the n52b25a that is currently in my car?
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      07-04-2018, 11:15 PM   #8
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Quote:
Originally Posted by Fattyboombatti View Post
i am going to keep the car, just out of curiosity it is a simple swap if i replaced it with a n52b30a, rather than the n52b25a that is currently in my car?
That's exactly what I would do. Just find one from a similar year and it should be straight forward.

Get a cheap borescope here https://www.ebay.com.au/itm/Waterpro...r=521626968514
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      07-04-2018, 11:30 PM   #9
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cheers for that. i may as well take the manifold off and have a look.

is it possible to remove the cylinder head without doing the engine timing again?
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      07-05-2018, 01:53 AM   #10
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