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Only one 10mm bolt holds on the dipstick guide tube. It just below top end of dipstick tube where dipstick feed in.View attachment 1798790
I use a piece of tape to help wedge the bolt head into my socket.View attachment 1798789
Interesting the old O-ring (factory installed) was knicked. Although my first on a 5.7L, i've done many on the 4.7L and this was first time I've seen a damaged O-ring. They must have moved the cam tower assembly guy at the Toyota engine plant to dipSticks!
View attachment 1798793
Took me longer to post this than replace the O-ring.