Re: Broken Skytech pinion tooth (Q200)
The shiny spot (scrape) you saw on the side of the housing is
indicative of the pinion gear being side loaded when fully engaged
into the starter gear on the engine. Rich Chappee would immediately
diagnose that as a kickback.
I'm of the opinion that you either had an electrical kickback or a
hydraulic kickback. Given the fact that you use a mag to start
indicates a hydraulic kickback. That happens when the battery you
are using doesn't have enough amperage to get over the top (high
compression). The result is a damaged housing, shaft, seals, etc.
As I've said before, the inrush amperage required to run a permanent
magnet starter is much greater than that of a B&C starter and
requires a larger battery. I still use a 25RG even though the B&C
will start an IO540 with an 18AH battery.
The reason we initially started using the Skytec was because it was
a direct replacement for the stock unit, no modifications.
The B&C requires modification to the mag box because the solenoid is
mounted at 45 degrees or so as opposed to vertical for the Skytec.
Simply mount the B&C and determine the area to be cut out of the mag
box. Use the piece you cut out, reverse it and flox back into place.
Reglass to restore rigidity to the mag box. Cut the interfering
corner of the motor mount pad so that the starter clears on
installation. You will need about a quarter of an inch clearance
around the new starter to prevent rubbing.
Hope this helps you. I really think you're wasting your time putting
on another reworked Skytec. Rich is a really nice guy but there is
an issue that needs to be solved here.
"Kevin Fortin" <kfortin@p...> wrote:
about the "magbox" mods you mentioned. What's happening there?(oops).
Don't waste your time trying to make another Skytec work. I triedstart
Hopefully I've put the starter issue behind me. You can do thesame.
emailswhatwithout attachments and I didn't realize it.interest to
SkytechJimtold me and after discussing what seemed to be the problem with
UponPatillo's starter aka. "electronic ignition induced kickback".
liked.receiving the new starter I installed it and it seemed to workwell, but hadmore of a "grinding" sound in operation than I would have
After a 10avionicsMAXIMUM total starts, in a hurry to get the airplane to an
shopvalve(onfield), I forgot to turn on the fuel, and, after a very shorttaxi, theobvious happened, I ran out of gas. Duh!!! I turned the gas
on,turnedwaited about a minute, then tried starting again. The prop
forofsomewhere between 6 to 10 seconds before the engine caught and Itaxied onmy merry way. A couple of days later, I picked the airplane up,jumped in tostart it, and was met with what seemed to be the grinding sound
gearstowith missing teeth (the engine did start, however).
find awastooth missing from the Skytech starters drive pinion gear. That
the badQnews. The good news, I was able to find the tooth. (I thank the
god's forproblemthat one.)
and theycustomerdid all they could to help. I can't complain about their
offthatrelated to something that can throw of a piece off big enough
it couldengine)gum up my engine (read off field landing and/or a damaged
or at theleast,least break off a tooth on the crankshaft gear, which at the
is goingeffortto be damn expensive.kickback.
toThisloosen the tolerances in the manufacture of the starter, Skytechhas allowedthe pinion to get too far away from the main gear on thecrankshaft. Thisresults in an incredible force trying to separate the gears.
force thanonfurther deflects the shaft that holds the pinion, which leads toeven higherforces on the gears, then ultimately to a broken tooth.
thewhatcenterline distances this weekend and I will let you guys know
I find.don'tPlease take it
feelingto good with this right now.