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I have a Fac Lyc IO-360-M1B with exact same Alt & installation Dwg (including rev) - mine bolts to engine perfectly as-drawn, I just verified by viewing my build pic's.
Look more closely, It is not bottoming out, the threads end before you get to the arm. Just add two washer and all is fine.
Thanks lr72 but that’s what I meant by bottoming out. The shank of the bolt bottoms out against the case. Two washers is the answer but I wanted to make sure I didn’t miss something. Also, this is a standard FWF kit and very likely others have the same issue. It’s very easy to miss this and torque the bolt against the engine case before it’s actually tight. Not ideal.
It’s good to bring stuff like this to future builder’s attention for sure! At the same time, its important to recognize that washers in aviation applications are (almost) always a “season to taste” thing - add or remove (nor more than three) as required to make the fit work out right. Generally don’t assume that if the drawings who’s one, you can/should only use one… there is enough variation in bolts to require assembly with an extra washer, thick or thin sometimes.
It’s good to bring stuff like this to future builder’s attention for sure! At the same time, its important to recognize that washers in aviation applications are (almost) always a “season to taste” thing - add or remove (nor more than three) as required to make the fit work out right. Generally don’t assume that if the drawings who’s one, you can/should only use one… there is enough variation in bolts to require assembly with an extra washer, thick or thin sometimes.
And on the lighter side - what is it with Canadian AME’s and washers?! In the US, we are taught to always use a washer under a nut, and under the head of the bolt of the bolt is supposed to be turned. Our DreamTundra was assembled by a Canadian AME a long time ago, and there were NO washers under any of the nuts. The drawings (Canadian) showed no washers anywhere…. Last week we were resealing the IO-540 that came from a Canadian airframe company, and the engine had been maintained as a certified engine (with meticulous logs) while they had it…and there were several Adel clamps and the like (nothing critical) that didn’t have washers under nuts….. Just giving my friends north of the border a hard time - I’m sure there’s nothing systemic going on here….
Thanks for your comments and contributions to this forum Paul. As a first time builder, and with your vast knowledge and experience I’d like to ask you a question. What’s up with biscuits and gravy? I mean you’re putting gravy on bread. No beef or even mashed potatoes…just bread.
Not Paul but I can answer part of that (at least in the South). Biscuits and Gravy is typically biscuits and Sausage Gravy. The sausage is usually pork but CAN be beef! Does that help?
The secret is to season it with washers (to taste).
You know that I grew up in Minnesota, so Canada was basically our favorite attic! I never heard about biscuits and gravy until I got temporarily mis-assigned to Texas (for 34 years….)….but yeah, if the gravy is adequately filled with crumbled pork sausage, it makes a hearty breakfast! Without sausage in the gravy? Forget it……
Maybe a specific mechanic issue, not a Cdn standard for sure. I seem to remember that manufacturer had a few other ‘issues’ with that airframe… too.
