01-15-2023, 10:55 PM | #1 |
Enlisted Member
4
Rep 35
Posts |
Is it common for valve stem seals to fail on N55?
Hi,
Is it common for valve stem seals to fail on N55? Helping a friend with 2011 X5 N55 with a heavy oil fouled spark plug on cyl6 only. It triggers a misfire only on cyl6. The borescope cam showed oil on piston top. All other cylinders (1-5) seem normal. Will do a cyl leak down test these days with him to test the rings and valves proper seal, but wanted to understand this model "statistics" at 150k miles Appreciate! |
01-16-2023, 07:35 AM | #2 |
First Lieutenant
114
Rep 306
Posts |
Not sure about the valve stem seals but the e70 in general has issues with the engine partition failing allowing water on the back of the engine causing issues with the ignition coils etc.
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02-11-2023, 01:53 AM | #3 |
Enlisted Member
4
Rep 35
Posts |
We''ll proceed with valve stem seals : Questions
So, we decided to proceed with the valve stem seals on the N55.
I was thinking about the intermediate levers spring compressor(11 7 110). I see it is a large tool to compress those springs. Thinking out loud. What if I use a steel rope to pull the intake camshaft towards the center of the head, so i can keep the springs compressed? That way i can release the pressure on the intake camshaft bearing caps then remove the bearing caps, and slowly i can remove the camshaft while those springs will release tension( slowly)? Or, like using a steel rope, with the eccentric shaft removed, grab the arms of the retention springs until no more pressure is put on the intermediate levers? That may help during installing.. thinking.. Don't know, never tried, just asking. Also, in the topic of asking, there is yet another specialty tool to preload the gate to the cyl head structure. - 11 4 450 - What is so special on that preload? Why can't i just push it while tightening the bolt? Or use some pliers? Is there any redefined force that needs to be applied and only that tool can provide it? Looks fairly basic |
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