Question: Stage 12 Step 12J of my C210X Manual for the J3 Cub and L4 Grasshopper refers to installing four bolts for the power module. These bolts are stated to be 50mm long. My bolts are only about 30mm in length. What's the story here?
Answer: The reference to 50mm long bolts in your version of the C210X Manual is incorrect. The bolts are 30 mm long when used in the J3 Cub and L4 Grasshopper. This allows the tapered cowl to be mounted without contacting excess bolt length. The picture and instructions of Step 12K are correct in showing the separation between the fixed fuselage firewall and the nuts to be approximately 22mm. It is this spacing of the nuts and power module firewall at approximately 22mm from the fixed firewall in the fuselage that is important, not the actual length of the bolts themselves.
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