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Old 12-04-2018, 09:58 PM
Join Date: May 2018
Location: NYC
Posts: 831
mr_robot is on a distinguished road
Yea my receipt shows N62TU valve stem repair kit. Bought it at a local BMW dealer as the Indy mech gets discounts there.

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Old 12-04-2018, 10:13 PM
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Join Date: Feb 2008
Location: Bellevue, WA
Posts: 838
X5only is on a distinguished road
Originally Posted by jpcallan View Post
Actually, there is no danger of a keeper, etc. falling into a cylinder as I faithfully used the black plastic spark plug hole guides provided with the AGA kit and the flag rod to plumb the piston TDC position, as well as faithfully using the AGA cam chain lock tool to prevent crank shaft movement. With the rope/bungy method there still exists the risk of dropping a valve into a cylinder when backing off the the piston a bit so the valve can extend into the cylinder to put the rocker arm back in place.

You raised the issue of the camshaft balancing lobe on cyl #2. I did the valve stem seals on an 2008 X5 with N62TU engine; #2 had no balancing lobe as described in the AGA Kit manual, but did have a balancing weight lobe on #7 that I had to work around. I've not seen anyone else describe this anomaly, but did confirm it with AGA tech support. AGA's instruction manual is indeed in need of some updates and revisions.
No, not falling into the cylinder but into the depths of the engine through the wide gaps around the timing gears - it's pretty obvious. If a keeper falls in there, it may be impossible to get it out without disassembling the lower timing case!

As for your assertion of the risk of the valve dropping when backing off the piston to install the rocker arm back, the valve spring and its keepers are already installed at this point so it's impossible for the valve to drop as long as you keep pressing down on the valve as the spring is compressed, the same thing you're to do when using air pressure or nothing at all! The only risk I see with a rope is it getting stuck due to forming a knot. For this reason a bungee cord is the way to go.
'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.

Last edited by X5only; 12-04-2018 at 10:37 PM.
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Old 12-04-2018, 10:39 PM
Join Date: Sep 2018
Location: Portland, Oregon
Posts: 8
jpcallan is on a distinguished road
Pieces getting into the engine interior

Originally Posted by X5only View Post
No, not falling into the cylinder but into the depths of the engine through the wide gaps around the timing gears - it's pretty obvious...
Sorry, I misunderstood where you were suggesting pieces might get lost. Another member somewhere warned of the danger of exactly that route of entry into the engine, so I heeded his wise advice by packing red cloth shop rags around the timing gear and chain. This route of stray parts entry is a risk whether one uses compressed air, rope/bungy or no combustion chamber filler.

An additional choice I made to minimize the risk of foreign material of any kind entering the engine was doing one cylinder bank at a time. I did my job outdoors in the driveway. I tarped the car at night and pulled 32" stretch-wrap over the hood to windshield gap to keep any rain/dust out.
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