Friendly reminder of SI 1508C

[marky_24]

I went to go fly my 78 J today and noticed that there was a good bit on oil under the plane , looking in the oil fill door I couldn't see where the oil was coming from .  So I removed the cowling and started cleaning up the oil.  When I cleaned the oil off the mag I noticed it moving very easily . I  Called my mechanic over to retime the mags , but they just wouldn't come into time.  So we pulled the mags and sent them off for an overhaul .  

 

It was odd timing, pun intended, that the mag had come lose and both sides went bad all at once .  I'm just glad it happened on the ground ! 

[Guest]

You mean this one. 

http://davidduffer.com/lycoming/Lycoming_SB_SL/si/SI1508.pdf

Clarence

[marky_24]

Yep,  I suspect that the mag hold down nuts got loosened to adjust the timing at the last annual in August and they didn't put new lock washers on.  

[carusoam]

That challenge is so old, people have forgotten about it.  But it hasn't changed.

They haven't invented a reusable lock washer yet...(?)

Best regards,

-a-

[Guest]

Although not called for, I add a pal nut aft torquing the STD1410 nut, especially on engines with a D3000 magneto.

http://www.aircraftspruce.ca/catalog/hapages/ms27151palnuts.php?clickkey=3020773

Clarence

[mike_elliott]

Clarence, do you know why Loctite is frowned upon by the powers who govern the installation universe of F * r * sin(theta)?

[Guest]

1 hour ago, mike_elliott said:

Clarence, do you know why Loctite is frowned upon by the powers who govern the installation universe of F * r * sin(theta)?

Mike,

While its not really standard practice, but certainly a dab of blue loctite would work as well.

Clarence 

[carusoam]

I would think that acrylic glue might be temperature sensitive to elevated temps.  Check the operating temperature range for the lock tite materials prior to use...

I only looked up one, 302°F was it's limitation...  (two part epoxy version)

then I looked up Loctite red.  They said service temperature is 300°F.  To remove parts that have been glued with the red, heat to 482°F is recommended.

http://www.loctiteproducts.com/tds/EPXY_HEAVY_tds.pdf

http://www.loctiteproducts.com/threadlockers.shtml

finally read about the blue... similar temp limitations there as well.

http://www.loctiteproducts.com/tds/T_LKR_BLUE_tds.pdf

How hot can a Magneto mounting bolt get?  About the same temperature as the engine's oil temp?

Best regards,

-a-