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Yep, that's the updated bolt. Check both banks, and also take a look at the tips of the camshaft lobes for wear.
Not sure if this shows anything, I've changed a few cams in my Ford days, I couldn't feel any ridges on the ends, and also checked the cam adjusters for play, they were solid. Car just passed 70k
If you can, turn the engine over by hand and check all the tips of the lobes up close. The crank bolt is a standard metric size, maybe 32 or 36mm I don't remember. Make sure to turn it clockwise. What I see in the pic looks good so far.
What's going to happen if you manually turn it CCW?
It's always good practice to turn the engine in the direction it runs. The theory is that if turned backwards the timing chain slack will move to the opposite bank, away from the tensioner side of the engine. Some engines use a ratcheting tensioner that once tight, cannot go back. Or, the side without the tensioner now having all the slack can skip a tooth on the chain or belt and become out of time.
The theory is that if turned backwards the timing chain slack will move to the opposite bank, away from the tensioner side of the engine.
If there's slack in the timing chain. What happens when you throttle lift at 7K RPM at load then get back on WOT several times at a race track?
Originally Posted by E55Greasemonkey
Some engines use a ratcheting tensioner that once tight, cannot go back. Or, the side without the tensioner now having all the slack can skip a tooth on the chain or belt and become out of time.
Does this theory apply to the M156? Timing chain routing, guide, tensioner etc below for reference.
As the camshafts got so low inertia they will decrease in rpm instantly due to friction on the lobes, so there will never be any problem hitting throttle on or off.
BUT!
Turning slowly backward will make the slack on the wrong side, i dunno if there´s any problem, but with worn out lockplates in camgears they maybe wouldn´t lock as they should, and maybe cause a problem.
I'm not convinced. Perhaps use a small screwdriver to pick around to feel if the Torx is internal or external.
lol thought the same, but look at where the shadow from the access hole. The light source is in the upper left and the shadow off the head is in the lower right... therefore external.
05-02-2022, 12:21 PM
