Spark plug tubes

[clickman]

Here's my el-cheapo tube removal and re-insertion tools, made from what I found laying around:





I just turn the pvc cap into the tube for a few turns, then grab it and yank.

The wood block is used to pop the new tube in.

[clickman]

Here's what a 119k km (75k mile) 13 year-old o-ring looks like compared to a new one (on the right). Hopefully that explains my leaks.

The width of the o-ring groove on the tube looks overly generous, allowing spreading of the o-ring. A narrower groove might keep the o-ring effective for longer.