Hi, first time I'm doing a head rebuilt on my WR, when I opened it, the front timing chain guide came out while the one on the rear side remained firmly in place. From the manual it looks normal but nothing written about how I should install it back. How do you make sure it is correctly installed if nothing really holds it to its place? Or is there something that olds it to its place that I don't know of? Have I mess with something? Thanks!