On = Jan 20, 2006, at 1:10 PM, Tracy Crook wrote:

Buly,=A0 You may be correct about the .027" error causing = the problem and I hope that is true.=A0
But,=A0 The key phrase here is "centered as the original = transmission gear box".=A0 Is the transmission bolt circle concentric = with the crankshaft?=A0 Is the transmission input shaft concentric with = the bolt circle?=A0 They might be (I have not checked) but there is no = rule saying=A0they have to be.=A0 For example, the RX-7 starter = as if the pinion is concentric with = the starter pilot and pilot hole that it mounts in.=A0 It is = not.=A0
=A0
Tracy
----- Original Message = -----
From: Bulent = Aliev
To: Rotary motors in aircraft
Sent: Tuesday, January 17, 2006 11:49 PM
Subject: [FlyRotary] Re: Coil & Alt cooling, Buly's input = shaft

Tracy,
I picked up the = resurfaced assembly today, and the machinist told me=A0
that one end to the other of the gear box contact surface = was .027 off.
I removed the original automatic = transmission gear box from the=A0
bellhousing and = replaced it with my new mounting plate. So everything=A0
was centered as the original transmission gear box. All the = mounting=A0
bolt holes were match drilled. With the = extra long shaft, .027=A0 will=A0
give quite = difference at both ends of the shaft.
I don't see = anything else to check?
Buly

> Input shaft
>
> Buly, got your input shaft today and checked it out.=A0 = The thrust=A0
> bearing rollers & races look a = little stressed but the roller cage=A0
> has been = completely trashed.=A0 I do not think the .005" out of=A0
> flatness on your bellhousing would explain this and = the odd wear=A0
> pattern on the plate.=A0 The marks = and discoloration (heat) on the=A0
> bearing and = shaft look as if there is misalignment between the E-
> shaft=A0 and the gear drive.=A0 When you built the = plate & bellhousing=A0
> adapter for = the drive, how did you verify concentricity?=A0 This is=A0
> much harder to do than verifying the parallelism of = the bellhousing=A0
> and plate but is absolutely = vital.=A0 There is no question that the=A0
> drive would have soon failed if you had continued to = run it.=A0=A0 Glad=A0
> this showed = up before flight.
>
> Tracy=A0 = (Happy to hear that Dave L. is safe!=A0 Good flying. )
> <coil-alt coolingA.jpg>
> --

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