Today's Message Index:
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1. 03:17 AM - Re: Re: Engine mount bolt loosens (D McFadyean)
2. 11:20 AM - Re: Engine mount bolt loosens (Area-51)
3. 12:53 PM - Re: Re: Engine mount bolt loosens (Bud Yerly)
4. 04:10 PM - Re: Re: Engine mount bolt loosens (Peter Z)
Message 1
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| Subject: | Re: Engine mount bolt loosens |
I think that misses the point, Which was that, despite proper locking, some installations
fret the mount against the engine, resulting in bolts coming "loose".
I've previously found one on a Pioneer, despite being tight for the preceding
several years.
BTW, the combination of Loctite plus the swarf that Rotax leaves down the tapped
mounting bolt holes is irremovable without significant risk of galling the threads
upon bolt extraction.
Duncan McF.
> On 26/12/2024 05:39 GMT Area-51 <goldsteinindustrial@gmail.com> wrote:
>
>
>
> Consult the Rotax installation manual and use the specified thread lock product.
>
> Alternatively purchase new cap screws and "hardened" washers to required specification
that have drilled heads to permit lock wiring.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=515170#515170
>
>
>
>
>
>
Message 2
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| Subject: | Re: Engine mount bolt loosens |
All valid; points noted.
On occasion have found bolt has loosened and departed the airframe leaving three
secure in place. Why does the bolt loosen? Vibration and the sum total of heat
expansion and contraction cycles of individual components. Check the flat washer
used under the cap screw heads; they should be hardened washers under the
spring washers.
I now make it a routine item at 25hrs to check the torque on all 4 engine to crankcase
frame bolts. Clean the thread well with brake clean and compressed air
before refitting. Ensure the spacer block between crankcase and engine frame
has been fitted during installation; visual inspection with light and mirror.
it cannot come out even if bolt departs the frame.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=515173#515173
Message 3
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| Subject: | Re: Engine mount bolt loosens |
All points well made. I found a solution but you won't like it as it is a
bit tedious in some cases.
I have found looseness in the following bolts:
The M10 Bolts securing the ring mount to the engine are torqued and many ha
ve lock washers on newer airplanes. It is rare but should I find one loose
, I use 10 mm Nord-lock wedge locking washers, rather than Loctite 243 alon
e as called for. Nord-locks are expensive ($25 for 20) but are very secur
e on steel and work especially well on aluminum. See Granger or Nord-Lock
direct. The Rotax Heavy Mx Manual has torque requirements for bolt sizes u
sed and further amplify in the specific installation of components like cyl
inder head bolts.
The M10 Allen head bolts securing the Engine Mounting Frame to the ring mou
nt using the M10 "Binx" nuts will loosen often. These nuts are particularl
y frustrating on the 914 near the turbo. I drill the bolt head and use .02
0 safety wire through the slot in the "Binx" nut back to the hole in the Al
len head. This is not hard drilling the Allen head, but I highly recommend
proper security of the bolt and cobalt 1/16 inch drill bits for the chore.
This is tedious with the engine on but can be done with long pliers and a
lot of patience. I may try 10mm Nord-Locks one of these times.
Exhaust nuts on the 912S are frustrating and difficult to safety wire. How
ever, I have had luck when the whole stud comes off with the nut to simply
buy new nuts, remove the old corroded nuts, clean the stud threads inspect
and if good reinstall with Loctite 243 on the head side (the Loctite will f
ail with heat but...) Secure the stud and allow the Loctite to cure overni
ght. I then install the new nuts, and I will peen the nut lightly if the p
rong ends are not grabbing well. On one aircraft a customer drilled the 8m
m bolts through the corner for 0.020" safety wire. Very secure, but I have
found my proper install and if necessary,peening of "sloppy fitting exhaus
t nuts" (as tolerances are not what they used to be) to be quite effective
. Exhaust vibration on the 912S is demanding on the exhaust system. Pay a
ttention to springs, the sealing points and look for soot. I've written on
this in the past and still find satisfaction with exhaust sealant and lapp
ing my joints. Springs require some silicone down the outside and just in
case I still put a loop of safety wire down through the springs to keep eve
rything secure.
Never use a Nylock nuts forward of the firewall. In high heat they melt, a
nd after exposure for a few years under the hood, will tend to fail. Lock
washers, Nord-Locks or safety wire are best. I find Nut plates and MS210 s
queeze nuts hold up extremely well over time. Squeeze nuts, MS210 type, ar
e very good unless reused, then proper re-peening will suffice for a tempor
ary fix for lack of a new nut on hand.
This is why I do a 25 hour oil change and inspection. Use Torque Seal on y
our nuts to determine if they have loosened. That way the inspection is qu
ite fast. If a bolt or nut has loosened apply a fix as stated above and the
n Torque Seal Again. Your airplane may look like a bunch of orange or yell
ow dots on all the bolts, but a stitch in time saves 9 as they say.
Best Regards,
Bud Yerly
________________________________
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> on behalf of Area-51 <goldsteinindustrial@gmail.com>
Sent: Thursday, December 26, 2024 2:20 PM
Subject: Europa-List: Re: Engine mount bolt loosens
>
All valid; points noted.
On occasion have found bolt has loosened and departed the airframe leaving
three secure in place. Why does the bolt loosen? Vibration and the sum tota
l of heat expansion and contraction cycles of individual components. Check
the flat washer used under the cap screw heads; they should be hardened was
hers under the spring washers.
I now make it a routine item at 25hrs to check the torque on all 4 engine t
o crankcase frame bolts. Clean the thread well with brake clean and compres
sed air before refitting. Ensure the spacer block between crankcase and eng
ine frame has been fitted during installation; visual inspection with light
and mirror. it cannot come out even if bolt departs the frame.
Read this topic online here:
https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.ma
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| Subject: | Re: Engine mount bolt loosens |
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