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Old 10-10-2019, 02:37 PM
jrs14855 jrs14855 is offline
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,318
Default Timing

Seven posts NO ONE has questioned whether or not this is an impulse mag.
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Old 10-10-2019, 05:50 PM
pa38112 pa38112 is offline
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 743

In theory it should work. I say try it.
When done with the pin, you remove the pin prior to installation, so all it does is give you a good starting reference - which you will already have before you remove yours.
Having said that, it is likely that you will accidently turn it during removal or installation. If you get it aligned with the right gear tooth and use your mark, it will be correct.
Do you have a mag synchronizer? I assume not since you asked the question in the first place. Even if you do it this way, I would want to confirm synchronization afterwards.
2004 RV6A Flying
2002 RV6A Flying
1978 PA38-112
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Old 10-11-2019, 02:00 PM
deek deek is offline
Join Date: Mar 2013
Location: Flathead Lake Montana - 8S1
Posts: 325

I've done something similar dozens of times on several EZ's - but not for the same reason as the OP. Most EZ's don't have enough mag to firewall clearance to permit removal/installation of the harness - so...

mark location of mag case relative to the accessory case with a Sharpie or scribe
while NOT moving the prop, carefully remove the mag with harness cap intact
while not moving the mag (or prop), install new gasket and reinstall the mag with the nuts hand tight
now, you MUST check the mag timing with a synchronizer - you will be close but probably not close enough.

That said, if properly installed, mag gaskets rarely leak. I use DC-4

The RV's I've worked on thankfully offer much better access, so my response is probably moot. Ask any EZ driver if he'd rather change a mag or have a root canal
'83 LongEZ - N888EZ 3,671 hours
'89 LimoEZ - N26EZ 686 hours (sold)
A couple of Glasairs and a Lancair 320...
Next: a RV14 need something to build

Last edited by deek : 10-11-2019 at 02:05 PM.
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Old 10-17-2019, 01:15 AM
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david.perl david.perl is offline
Join Date: Dec 2010
Location: Watford UK
Posts: 120

Thanks for all your responses

The gasket was indeed torn when we replaced it.

We did as the majority suggested, used the timing pin to hold the internal gear and replaced the gasket then retimed the mag

It took 10 mins longer to removed the rear cap and install the pin, still 10 mins is 10 mins!

My question was based less on the time issue and more about trying to understand the inner workings of the mag, such that the pin needs using even with minimal movement of the gear when replacing the gasket.
SB RV 7A IO360 lycoming and Hartzell CS prop
First flight October 2015
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