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Ram air delete, Intake modification, and fuel servo questions


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Posted

Good evening smart people,

I am about to delete the ram air and have a couple of questions.  My plane is 2 hours away and I left my parts manual and service manual with the plane.  I downloaded the manuals but cannot find what I am looking for.  My goal is to have all of the supplies and do as much as I can, and minimize AI time.

1. One of the four bolts attaching the intake to the fuel servo needs to be replaced.  The parts manual I downloaded shows studs and nuts and I circled that in the screenshot, but mine has bolts and requires safety wire.  What is the part number for the bolt, and can I get that on Spruce?

2. The parts manual does not show a gasket between the intake and the servo, and I marked that area with the arrow.  Is there truly no gasket here ?  The maintenance manual I downloaded does not mention this in the engine section and I cannot find what I am looking for on the Lycoming site.

3. I need to get the proper piece for part #5 to cover where the butterfly valve once attached.  LASAR shows out of stock.  Where can I get that, or what grade of aluminum sheet should I order ?

4. I bought the proper epoxy, antimony, carbon fiber, and other supplies to fix cracks and stiffen the upper cowl.  I can use those supplies to delete the hole in the lower cowl or even rivet a temporary cover plate.  No concern here.

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Posted

Parts listing for item 4 calls for AN74-5A bolts.

Contact Frank Crawford at Mooney and he should be able to look up material spec. for item 5.

There is no gasket between the items 2 and 3.

 

  • Like 1
Posted

You shouldn't have to disturb anything behind the airbox (1), so items 2, 3, and 4 shouldn't really need to be touched.    The delete removes 5, 6, 7, 14 and replaces all of that with the cover plate 5, which is just a piece of aluminum cut and drilled for the rivets.    You can use a strap duplicator to drill the holes in the cover plate after cutting it from some sheet aluminum.  

Beyond that it's just remove the control cable and patch the hole in the cowl.

Mooney Service Instruction M20-93 has the instructions to do the delete.    The round cover for the hole is pretty easy to fabricate.

  • Like 1
Posted

Thank you both.  I already had the SI saved and think I have it from here.  The SI does not state that the induction system needs to be removed but it would only take a few minutes.  This will require grinding the existing rivet heads down on the butterfly valve housing and either punching or drilling the remainder of the rivet, which would end up in the induction system.  I thought removing the intake would 100% ensure that no stray particles or rivets would ruin my whole weekend and then some.  The alternate air gasket needs attention too, and I have the 1300 adhesive for that.

  • Like 2
Posted

BTW, save the cowl seal/gasket (14), as it can be used on the oil cooler between the cooler and the baffle duct.   The spacing of the keeper pulls is the same and it will attach to the cooler.    On mine the gaskets there were falling apart and I couldn't find a suitable replacement.    This works very well.

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