Just went through the thread stack. For anyone just jumping to the end, trying to summarize here, it seems to be a low RPM oiling issue with the N52 engine, short errands aggravate the situation. The ultimate fix seems to be a new cylinder head with a check valve that ensures proper oil pressure is maintained in the cylinder head. Unfortunately, SIB still instructs the dealer to change the exhaust-side hydraulic valve actuators first. So, it means you will make at least two trips to the dealer before it gets done right.
Cylinder head replacement was almost always a permanent fix, but there are a couple posts by people that continued to have problems.
Some early posts showing scored parts, due to lack of oiling, so I would question any comments indicating this is just a cosmetic fix. Based on the expense, I'd have trouble believing BMW is authorizing the repairs based just on cosmetics.
The latest SIB, quoted below, confirms which cylinder heads were bad and based on the date, does look like early 2009 builds (guess on my part, don't have actual production dates) used old parts before the new parts were finally incorporated into production. Keep that in mind if you are looking at a CPO. It's approximately a $7.5k fix out of warranty.
Page 49, post # 1058
Quote:
Originally Posted by cimbali
September 2009
This Service Information bulletin supersedes SI B11 09 07 dated January 2009.
SUBJECT
Intermittent Hydraulic Valve Adjuster (HVA) Noise
MODEL
All E82, E83, E88, E85, E86, E60, E61, E70, E90, E91, E92 and E93 vehicles with N51, N52 or N52K engines produced approximately up to November 31st 2008; refer to cylinder head casting identification attachment.
SITUATION
An occasional ticking or rattling noise from the camshaft hydraulic valve lifters (HVA) may occur during cold engine starts, due to frequent short-distance driving, or the noise may occur for an extended period of time even though the engine is at operating temperature.
Improved parts were phased into production beginning on 10/1/2008 and fully implemented on November 31st 2008.
CORRECTION
Do not perform the bleeding procedure that was previously provided in SI B11 09 07 which has now been deleted.
All vehicles produced between 10/1/2008 and 11/31/2008 must have each vehicle's cylinder head casting number identified before hydraulic valve lifters (HVA) replacement, due to staggered implementation. Refer to the attachment for the casting number location. Vehicles produced after 11/31/2008 have already been fitted with improved parts. Vehicles produced prior to 10/1/2008 will require the new parts.
Improved Casting Numbers
N51 (B30)
7588277.01
N52 (B30)
7588273.01
N52K (B30)
7588271.01
A cylinder head casting number that does not match will require replacement of the 12 exhaust camshaft hydraulic valve lifters (HVA) as per Repair Instruction RA 11 33 050, Removing and installing/replacing all rocker arms. Only the exhaust camshaft and rocker arms have to be removed in order to replace the hydraulic valve lifters. Do not remove or replace any intake camshaft valve train components.
PARTS INFORMATION
Part Number
Description
Quantity
11 33 7 605 330
Hydraulic Valve Lifter (HVA)
12
Refer to EPC for additional gaskets, seals and bolts, as required by the Repair Instructions.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty, or the Certified Pre-Owned program.
Please refer to the latest KSD for the applicable Main or Associated labor allowance for the specific model.
Defect Code:
11 33 93 39 00
Labor Operation:
Labor Allowance:
Description:
00 58 248
Refer to KSD
Replace exhaust camshaft hydraulic valve lifters (HVA)
*Main Work
or
00 58 827
Refer to KSD
Replace exhaust camshaft hydraulic valve lifters (HVA)
+ Associated Work
Note: The following explanations will spell out the correct use of the work times.
Main Work:
Use this labor operation number when the only repair performed is the listed warranty repair.
OR
+Associated Work:
Use this labor operation number when other repairs or services are performed along with the listed warranty repair.
Under no circumstances should both labor operation numbers be claimed. Attempts to claim both times will result in an unnecessary delay in claim processing and payment.
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