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Thanks again for your review! This does not impact the operation or service of any of the AeroVee Parts. Just did that big bore kit? In any case, I hope you are able to get things resolved! Fits all Chinese 4stroke engines as well as your budget. In fact, this is the first wide zoom to offer inbuilt optical stabilisation, allowing you to do things not previously possible with a wide angle lens.
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If your engine is impacted by this machining error please contact us at tech sonexaircraft. Multimeter test prescribed in original service bulletin proved inconclusive. Service issue existed in very isolated cases, and improper Installation is suspected in some. The ACV-Z screws provide added thread engagement to help prevent these screws from potentially backing out. Applying Locktite Primer and Threadlocker, and using the proper tightening procedure on these cap screws are also extremely important.
See the following AeroVee Installation Manual Page that references this hardware and details the proper assembly, Download: All AeroVee Nikasil Cylinder Owners should be advised that Sonex has received two reports of damage to the Nikasil Cylinder barrel walls from the Piston Clips coming out of the keeper groove. We believe this damage has two main factors: If the clips are not installed properly, they may not be sitting in the groove and could exit the side of the piston and cause damage.
A distinctive "click" should be heard when the two sides of the clip are released. It is imperative that you confirm full engagement of each clip in its groove. Sonex also highly recommends the purchase of a "c-clip" pliers or equivalent to accomplish the installation of these clips. The clips supplied to Sonex from the Nikasil Piston vendor do not fit as tightly as other clips we have sourced. We have replaced all of the clips in the Nikasil Cylinder sets with the following item and stock number from AirCooled.
Sonex Aircraft highly recommends that at the next Annual inspection the current piston retaining clips be thoroughly inspected or replaced with the Part Number above. All AeroVee Engines shipped since 1. To date there has been one incident of a flywheel being destroyed where the backing out of these screws is a possible cause.
First install the ACV-Z screws and ensure the stator is fastened tightly. If the alternator stator is not tightly attached to the plate, the screws may be bottoming out in the mount plate. Modify the Mount Plate per the attached control print. AeroConversions discovered today Friday 8. These screws secure the secondary ignition trigger shaft assembly to the flywheel and are installed by the builder, not pre-assembled by AeroConversions.
A coarse thread socket cap screw can be installed and will give the incorrect impression that it's provided a tight fit. The resulting joint using this hardware is not acceptable and must be repaired.
If found to be the incorrect thread, please contact us immediately at techsupport aeroconversions. If the ACV-Z hardware has already been installed, the alternator cover plate should be removed and one of these 4 screws should be removed and verified for proper thread.
Please refer to your AeroVee Assembly Manual for the proper installation instructions for this hardware. Information originally contained in this service bulletin is superceded by service bulletin ACV-SB listed above. These instructions below detail the removal of a restrictor plug installed in the oil galley near the 1 front bearing, and its replacement with a threaded plug: AeroConversions has never found evidence that the solid plug restricts oil flow, but offers these instructions for those who feel the oil flow to the 1 bearing may be impeded.
Having accomplished this procedure recently on 3 of the factory demonstrator engines and seeing no negative consequences, AeroConversions has decided to remove this restrictor plug from all new AeroVee 2. If your oil pressure drops below the published operating limits after performing this operation you may need to install an oil pressure adjuster in the rear oil pressure relief port to maintain the minimum oil pressure of between 40 and 50 psi at rpm.
AeroVee Engines must be operated with an oil pressure between 40 and 50 psi at rpm. Running with low oil pressure can lead to a catastrophic engine failure. If you are experiencing low oil pressure, first try placing a shim under the oil pressure relief plug at the flywheel end of the engine. If this does not correct the problem, remove the plug, spring, and plunger and check the condition of the plunger seat in the case. Below are two images: If you are not flying yet, inspect this area of your case and ensure you have the correctly machined plunger seat.
A few AeroVee 2. Perform the check shown in the picture above. Remove the bearing and chamfer the edge facing the counterweight. This can either be accomplished using a fine, half-round file or a Scotch Brite Wheel shown in the attached image. Thoroughly clean the bearing before final installation.
Only a small amount of chamfer is required to eliminate this issue. Ideally, there should be Qty 3 end shims used to reach the required 0. A part exchange of the new part is available to AeroVee Customers at no charge.
If you find that you do not have sufficient end play, please contact the Sonex Tech Department for an RMA number and to arrange for this part exchange at: Secondary Ignition Trigger Magnet Size. This check does not apply to the black trigger magnet caps. General AeroVee Assembly Practice: Do NOT place a chore-boy, steel-wool, or any other metal object into the Breather plate assembly. Over time, this can break down and metal particles can work their way into the engine case. DO put a larger hump in your oil breather tube so any oil that bubbles out of your case will drain back into the case rather than flow out the bottom of your airplane.
We also understand some engine builders have needed additional barrel shims for their engines depending on what compression ratio they chose to set their AeroVee Engine at. It's difficult to get all of the combinations covered in one standard package without being wasteful. Sonex furnishes and has only charged the customer for one set of 0.
Additional shims are available for purchase from Sonex with the following part numbers to suit your particular needs: Aeroconversions does not recommend installing the Prop Hub or any other shrink-fit components with a press without first cooling the crankshaft in a freezer and heating the installed components in an oven.
The recommended assembly procedure is detailed in the AeroVee 2. Attempting to press these components on cold can result in extremely high stresses in the nose end of the crankshaft. Any misalignment between the shrink-fit component and crankshaft may result in damage to both components and could result in stress cracking, a crooked prop hub, and a structurally inadequate shrink-fit joint.
All Printed AeroConversions Materials approving the method of cold press for this procedure must be updated by striking this out with a permanent marker. All Crank Shaft Assemblies that have been accomplished using a cold press method must have their runout checked with a dial indicator per the following image: All Assemblies accomplished using a cold press method must also be removed and checked thoroughly including a magnaflux process on all components to ensure stress cracks are not present.
It is critically important that the crankshaft have proper support behind the front journal. Refer to the following image showing this technique with proper support behind the front journal: This does not impact the operation or service of any of the AeroVee Parts. If this misalignment is more than 0. The identification of this problem and the fix are both simple procedures: Reattach the stator mount plate assembly to the Accessory Case.
Reinsert as carefully as you can to keep the Blue Marker intact. Also remember that the magnets are strong! They will pull the alternator right out of your hand and can pinch your fingers. Remove one set of spark plugs and manually rotate the crankshaft turn the engine over 3 or 4 revolutions.
A socket on the prop hub attach bolt works well to pull the engine through. Remove the stator mount plate assembly and inspect the blue paint on the stator and magnet ring. Again use care to keep from scratching off the Blue Marker as you remove the stator. If the blue marker is intact on both the stator and magnet ring, your alignment is acceptable. If either the stator or magnet ring show signs of contact, proceed to Step 5. Remove material from the Alternator Stator using a belt sander or equivalent where the Blue Sharpie has been wiped from the Stator.
See Figure 5 and Figure 6 Repeat Steps 1 through 4 until no contact is evident. Note that this same procedure can be used on the primary ignition magnetron units by " painting " the trigger magnet on the flywheel to ensure no contact is occurring between the magnet and ignition module.
The red anodized surfaces of your AeroVee Engine Components act as an insulator.