The BMW N62 V8 engine found in the E60 5 series, E63 6 Series and the E65 7 series
engines has a common problem of smoking after idling for a few minutes. The seals
become hard and brittle and start letting oil past the stem at idle when the vacuum
is high -
The official approach is to remove the heads and replace the valve seals, which in the UK costs between £1250 and £2000 at an independent dealer. (See page 3 for contact details)
The AGA Valve stem seal kit allows you to change them in situ saving lots of time and cash. The main problem is that the tool costs $900 which is around £800 once landed here in the UK. See page 3 for rental options.
My car has done about 117k miles and is steadily getting worse -
In addition to the usual tools, you are going to need a few special tools:
I had an existing pair which I heated up and bent from 45 to 90’ angle, which did
a number of them, but I couldn’t get it onto cylinder #4 -
4) Compressor to supply the leakdown tester
5)Leak down tester or adapted compression tester -
This particular leak down but I found it only put 15 psi into the cylinder, so I just used the hose and fed it directly into my regulated 80 PSI air supply for my workshop.
6)USB Endoscope or small camera.
On my 750 I couldn’t even see the inlet valve for cylinder #4 which is close to the
7) I purchased Elring OEM spec seals in the UK from Andrew Page, cost about £120.
The valve stem seals are part number 199.440 for a pack of 16, you needs two packs for the engine.
The rocker cover gaskets are Elring part number 725.340 (UK Nearside Cyl 5-
They fit the following N62 V8 based cars:
BMW E60/E61 540i,545i,550i
BMW E63/E64 645Ci,650i
BMW E65/E66 735i,740i/LI,745i/Li,750i/Li
Here’s all the partnumbers which includes the front timing covers and vanos solenoids which you should change:
Part Number Description QTY
11127518420 Ecentric sensor seal 2
12141748398 Rear cam sensor seals 4
11127570219 Spark plug tubes 8
7119903596 Servo o-
11147506419 Offside front timing case gasket 1
11147506424 Nearside front timing case gasket 1
11367546379 Front cover solenoid o-
11367513222 Front cover solenoid o-
11667509080 Vacuum Pump o-
11127541887 flange nut 1
11127541887 torx bolt 2
All German Auto (AGA) BMW N62 V8 Valve Stem kit.
The tool comes with good instructions and there’s also a video on their site showing
how to use it -
Remove the air plenum at the front -
Remove the pollen filters and then remove the ducting leading into the car -
Now remove the bulkhead -
At every opportunity use a vacuum to remove dirt and leaves, you don’t want any of this dropping down into the rocker covers when you remove the,
Disconnect the gas struts and prop the bonnet up. It will go almost vertical and give you more room and light.