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Bill Schlatterer
Joined: 09 Jan 2006
Posts: 195
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 Posted: Tue Mar 11, 2008 6:44 pm Post subject: Cowl to Spinner Fit with 2.25 Spacer |
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I have a problem with the Spinner gap caused by using the Vans 2.25 spacer recommendation instead of waiting on the prop. First let me say that I think the spacer method would have worked fine BUT it should have been 2 1/16 instead of 2 1/4. I am fitting a Hartzell BA to an O-360 AIA and it just doesn't work. I used the 1/4 inch metal spacer and one washer under the spinner plate per plans.
The first picture shows the spinner spacer which was three pieces of good plywood cut accordingly with a couple of nickels for additional space. That gave me a 2.230" spacer. I fitted the cowl which was a little tight at the top and a little wide at the bottom. The faces of the top and bottom cowl are not actually parallel. My plan was to build up the inside back of the top cowl face and the outside of the bottom face and then shave it parallel with the spinner plate to make a perfect 1/4. In the second picture with no prop and spacer, the clearance at the top is a little under 1/4 and maybe 3/8 at the bottom.
Third picture. Now comes the prop and with nothing different,….the gap closed to 0 at the top and 1/4 at the bottom. No doubt about it, the spacer was simply too long. It should have been no more that 2 1/8 to 2 1/16 to leave a little fill room. 2.00 might be perfect if you plan to true up the face later. It the spacer is too long, it causes you to fit the cowl further out from the firewall than it should be.
Here is where I would ask for an opinion on my fix.
I don't want to recut the hinges and try to move it around so I am thinking that I will build up the top cowl face from the inside with epoxy and long hair flox about 3/8 of an inch and then simply sand off/back 1/4 inch off the top half of the cowl and square it up with the spinner plate. In the third picture, you can see marks that would be a 1/4 inch gap. (effectively just sand back to those lines)
The bottom is about right now but needs to be trued up a bit with some build on the outside and then the whole cowl face fitted parallel to the spinner. This doesn't seem like nearly as much work as cutting the whole face off, trimming, and then glassing back. Other than taking a little patience, I can't see any reason why it won’t work. I don't have a lot of glass experience yet but I think the epoxy / long hair / layer of glass on the inside should be as strong as the original when it's sanded back a 1/4. The last picture shows how much needs to come off on the top. ( 1/4 inch paint paddle)
Comments please.
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Thanks for any help?
Bill Schlatterer
7a ARK
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Doug Gray
Joined: 10 Jan 2006
Posts: 112
Location: Sydney, Australia
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| Posted: Wed Mar 12, 2008 12:46 am Post subject: Cowl to Spinner Fit with 2.25 Spacer |
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On Tue, 2008-03-11 at 21:41 -0500, Bill Schlatterer wrote:
| Quote: | I have a problem with the Spinner gap caused by using the Vans 2.25
spacer recommendation instead of waiting on the prop. First let me
say that I think the spacer method would have worked fine BUT it
should have been 2 1/16 instead of 2 1/4. I am fitting a Hartzell BA
to an O-360 AIA and it just doesn't work. I used the 1/4 inch metal
spacer and one washer under the spinner plate per plans.
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What about spacers between the engine mount and firewall?
Doug
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Bill Schlatterer
Joined: 09 Jan 2006
Posts: 195
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Missed that entirely.