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Pulling Gearbox

  • jwalsh2
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3 months 2 weeks ago - 3 months 2 weeks ago #18430 by jwalsh2
Pulling Gearbox was created by jwalsh2
My gearbox flange drips some oil. The previous owner had the unit R&R'd by an A&P (probably not experienced with Rotax). They used a different gasket making material. It's been less than 200 hours since overhaul. Should I overhaul at the same time or would that be a waste?

Do I need to buy the Rotax gearbox puller tool or is there an aftermarket one I can use.

thanks.

John
Last edit: 3 months 2 weeks ago by jwalsh2.

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3 months 1 week ago #18432 by kstewart
Replied by kstewart on topic Pulling Gearbox
John, I have never had to use a puller to remove my gearbox and I'm guessing that if yours is leaking then it won't be adhered very well anyway. Make sure that you remove all of the bolts, there are a couple that are easy to forget. Personally I wouldn't bother overhauling it again unless you have a known problem. Gearbox removal is realatively straightforward and you can just remove it for service at the appropraite intervals.

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3 months 1 week ago #18433 by jwalsh2
Replied by jwalsh2 on topic Pulling Gearbox
Thanks. Do you know what solvents I should have to clean the mating surface(s). I can look this up in the manual..

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3 months 1 week ago #18435 by RobSeaton
Replied by RobSeaton on topic Pulling Gearbox
Depends on what your A&P used: Loctite "chisel" paint stripper if he used something like Loctite 518 (dab it on with an acid brush)
If he used a silicon based sealant use lacquer thinner, varsol or an automotive wax removed such as Dupont Prep-sol.

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3 months 1 week ago #18458 by jwalsh2
Replied by jwalsh2 on topic Pulling Gearbox
Thanks. Are you guys pretty sure I won't need the gearbox puller?

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3 months 1 week ago - 3 months 1 week ago #18462 by Roger Lee
Replied by Roger Lee on topic Pulling Gearbox
I've had to pull all my gearboxes. I've never been able to just yank them off by hand. Here is an inexpensive homemade puller for the rare occasion you may need to pull the gearbox. Works like a charm. I made this about 20 years ago. It is just 1" angle iron. Two holes drilled in the ends for the bolts that attach it to the gearbox. The other two bolts that hold this together are not tight. Barely loose so the arms can move. There is a hole in the straight end piece to put a slide hammer into. You can buy a inexpensive slide hammer at Harbor freight. You just attach the puller to the gearbox with two bolts. They only need to be finger tight. Tap the slide hammer back a time or two and the gearbox slides back and you just pull it all the way off and tip it up so the small amount of oil doesn't drool out all over everything. Put a rag under the gearbox because some oil will come out when you first pull the gearbox back.. The gearbox puller will fold down for easy storage.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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Last edit: 3 months 1 week ago by Roger Lee.
The following user(s) said Thank You: DHeal, kenryan, Gyrochook.

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3 months 1 week ago #18466 by jwalsh2
Replied by jwalsh2 on topic Pulling Gearbox
Thanks for the great help. I was looking at the price of Rotax's tool... $522.00!! This will save me quite a bit of money. :-)

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3 months 1 week ago #18467 by Roger Lee
Replied by Roger Lee on topic Pulling Gearbox
I think I built this for about $15 - $20 years ago and that included the slide hammer. I got the 1" angle iron at Ace Aviation ( Ace Hardware :)).

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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3 months 1 week ago #18480 by jiott
Replied by jiott on topic Pulling Gearbox
Approx. lengths of the 3 pieces please.
Thanks Roger.

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3 months 1 week ago - 3 months 1 week ago #18482 by Roger Lee
Replied by Roger Lee on topic Pulling Gearbox


12" each piece. The wide opening towards the rear allows the prop flange to stay clear.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-574-1080 Home (TRY HOME FIRST)
520-349-7056 Cell

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Last edit: 3 months 1 week ago by Roger Lee.

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3 months 6 days ago #18497 by jwalsh2
Replied by jwalsh2 on topic Pulling Gearbox
Another question.. Mine has a constant speed prop and governor. I will need to disconnect the oil line from the governor to the oil pump. Will I need to pressurize the oil system after reinstalling the line and prop?

Also, since I'm only doing this to reseal the gearbox, would it be possible to leave the prop attached to the gearbox and pull them both?

thanks again. John

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