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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Aug-03-2017, 03:02:15 PM   #1
Slavic4
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Default M3 bent valves, next step help!

My e46 m3 bent some valves after intake hub got stuck, what should I do?
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Old Thu, Aug-03-2017, 03:12:02 PM   #2
Mr.Sono
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Default Re: M3 bent valves, next step help!

get the engine to the shop to check which valves were bent, then replaced them and move on. Make sure to replace head gasket too.
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Old Thu, Aug-03-2017, 03:13:01 PM   #3
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Default Re: M3 bent valves, next step help!

I guess pull the head and assess what needs to be replaced. Did you do a leakdown test?
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Old Thu, Aug-03-2017, 08:37:15 PM   #4
Mr.Sono
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Default Re: M3 bent valves, next step help!

Quote:
Originally Posted by Jonnie86 View Post
I guess pull the head and assess what needs to be replaced. Did you do a leakdown test?
yes
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Old Fri, Aug-04-2017, 12:26:18 AM   #5
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Default Re: M3 bent valves, next step help!

why did intake hub get stuck?
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Old Sat, Aug-05-2017, 02:13:20 AM   #6
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Default Re: M3 bent valves, next step help!

Not enough info to get too specific, but I'd get somebody to bore scope it first.
If you slightly bent some valves, not a big deal other than expense of valve job and replaced valves (and number count, it adds up).
But if you bent one so badly the piston also tried to bend the body (versus just the stem), or poked a hole in a piston, or absolut worst, broke off during continued running and destroyed the bore, well, it's engine swap time.
So, answer is, ... it depends.

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Old Sat, Aug-05-2017, 04:23:20 AM   #7
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Default Re: M3 bent valves, next step help!

Quote:
Originally Posted by ThunderMoose View Post
why did intake hub get stuck?
+1 .
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Old Mon, Aug-07-2017, 08:28:13 AM   #8
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Default Re: M3 bent valves, next step help!

I’m guessing the intake cam gear bolts sheared off and caused interference. If that’s the case, then sorry to hear. It could be minor. Use a borescope as stated, do a leak down test, do a compression test. See what the results are. If it’s just minor valve damage to one or two valves (which isn’t unlikey), just pull the head, bring it to a shop, buy the OEM valves from ECS tuning, Buy head bolts, buy a head gasket, buy other necessary gaskets, buy a torque angle tool, and continue on. I’m guessing around $1,000 in parts and labor to redo the valves bent. That’s if you do the pulling of the head and installation of the head on your own. I’ve seen this happen before, and assisted in the job for one of them.
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Old Fri, Aug-11-2017, 10:32:56 PM   #9
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Default Re: M3 bent valves, next step help!

just chiming in, I had a similar situation on mine I've been fixing. Exhaust vanos hub tab broke off and was caught in the timing chain where it was pulled over the intake cam sprocket, causing the intake camshaft to jump several teeth, two intake valves made brief contact with the piston, and the engine shut down.

I retimed the engine hoping to get lucky.. Cylinders 1-4 had 7-8% leakdown (good) but 5 had 15% (not good) and #6 had 30% (bad!). There are no marks on the pistons (100K miles on engine) at least not that could be seen with a bore scope. I was involved in that dumpster fire of a GB for the Status Gruppe headers which I finally got out of so it's not repaired yet, but the plan is to install ARP studs, deck the head if needed, install new valves and valve guides, valve adjustment, and reinstall. I already did a TT V3 hub and Beisan refresh on every VANOS component while I've been waiting for headers to show.
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Discussing M3 bent valves, next step help! in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)