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Old 05-22-2021, 04:51 PM
flightlogic's Avatar
flightlogic flightlogic is offline
Join Date: Nov 2013
Location: Prescott, AZ
Posts: 1,665
Default Bolting fuel tank on- best practices

Fixed a small leak with Pro-seal. When I removed the tank, there were 21 bolts. None had washers and all were hard to remove inside the inspection holes.
In the original build, are there supposed to be washers on the AN bolts? Does anyone use Loctite? I don't want a heavy tank getting loose at any time.
Any best practices or experience appreciated.
"Kindness is never a bad plan."

exemption option waived. Donation appropriate.
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Old 05-22-2021, 05:04 PM
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nzrv8 nzrv8 is offline
Join Date: Jun 2009
Location: Australia and NZ
Posts: 210

Yes there should be washers under the heads. Loctite isnít required as the nut plate thread bores are deformed slightly to provide locking. Just torque correctly and youíll be fine.
Paid up - Sep 2021
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Old 05-22-2021, 05:09 PM
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wcalvert wcalvert is offline
Join Date: Jan 2019
Location: Anacortes Wa
Posts: 299


What Model?

Most any AN bolt threaded into a platenut will be shown with a washer as the bolt head turns against the surface it's bearing against.

Locking fluid should not be required, the platenut provides the locking action.

Just my amateur opinion, but this reflects what I see in the Van's plans.

You may also take a look at AC 43 for the horse's opinion
RV-7 Tipper
Bill (Wild) VA-165 '90-'93
Anacortes, Wa

First Flight 7/17/2021!!
- Been there, Donated 2021
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Old 05-22-2021, 05:09 PM
David Paule David Paule is offline
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,003

I'm not an RV-9 builder but I do have the thumb drive plans. Like other RVs, the Z-shaped brackets on the back of the fuel tank should have locking plate nuts on them. These do not need Loctite since they have a locking feature. The AN3 bolts should have thin washers under the heads.

The hardware call-outs are:

K1000-3 Platenut
AN3-4A bolt
AN960-10L washer.

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Old 05-22-2021, 06:12 PM
PhatRV PhatRV is offline
Join Date: Mar 2018
Location: Buena Park, California
Posts: 565

These are the screen capture of the RV8 plan, which is very similar to the RV9

The bolt call out are below
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RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Canopy Done. Fiberglass 80%
Avionics Installation -- 90%
Firewall Forward -- Cowl completed. Baffle 90%
Electrical -- 90%

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Old 05-22-2021, 06:40 PM
BobTurner BobTurner is online now
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,777

Was this a QB? I'd measure the bolts, make sure you have the right ones. My QB came with bolts that were one size too long, with 3 washers under each bolt head. Make sure they didn't use bolts that were too short, and leave out the washers to try to make up for that.
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Old 05-23-2021, 03:23 AM
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rv8ch rv8ch is offline
Join Date: Feb 2005
Location: LSGY
Posts: 4,152

I use a bit of acf-50 anti-corrosion on bolts or screws like this that I won't see that often. Tef-Gel is also a product that seems to also be recommended for this type of application, which I use from time to time.
Mickey Coggins
"Hello, world!"
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Old 05-23-2021, 07:50 AM
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Karetaker Karetaker is offline
Join Date: Aug 2017
Location: USA
Posts: 227

If concerned about loose bolts, perhaps in worn out nut plates, you can add a lock washer of your choice between the flat washer and bolt head.
Vans RV and Pietenpol Channel
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Old 05-23-2021, 11:24 AM
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flightlogic flightlogic is offline
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Location: Prescott, AZ
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Great thoughts. Thank you all!!!
"Kindness is never a bad plan."

exemption option waived. Donation appropriate.
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Old 05-30-2021, 11:10 AM
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avrojockey avrojockey is offline
Join Date: Aug 2019
Location: Appleton, WI
Posts: 394

When I fixed my leak I had my tank off and on twice...

Stubby handle ratchet and various size extensions are your friend when dealing with limited space and wires/pitot plumbing
Tim Holmes
Appleton, WI
RV-9A N904DC
2019-2021 Dues Paid
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