Re: moving crankshaft

Buhwana · Post by **Buhwana** » Mon Oct 09, 2006 7:35 am

'i have a PT-19 with the 200 hp ranger engine. After flying for an
hour yesterday and while inspecting the prop I gave it a tug and to
my surprise i was able to move it about 1/2 inch forward as if the
entire shaft was moving within the engine. The engine was warm and I
have yet to try it when it's cold, but is this normal. Is there a
tolerance that that crankshaft can move within the engine?
Tom'

adameron@bellsouth.net · Mon Oct 09, 2006 8:07 am

'If like any other engine it has a thrust bearing to absorb end play consisting of flanges on the crankshaft and matching flanges on one main bearing. It would have to be worn extremely to move as much as 1/2".

>
> From: Buhwana
> Date: 2006/10/09 Mon AM 09:34:09 EDT
> To: fairchildclub@yahoogroups.com
> Subject: [fairchildclub] moving crankshaft
>
> i have a PT-19 with the 200 hp ranger engine. After flying for an
> hour yesterday and while inspecting the prop I gave it a tug and to
> my surprise i was able to move it about 1/2 inch forward as if the
> entire shaft was moving within the engine. The engine was warm and I
> have yet to try it when it's cold, but is this normal. Is there a
> tolerance that that crankshaft can move within the engine?
> Tom
>
>

'

Mike Danielle · Post by **Mike Danielle** » Mon Oct 09, 2006 9:12 am

'Check the dog nut that secures the thrust bearing (behind the prop hub). I
found one that was only finger tight and a prelude to disaster.

Ranger Mike

----- Original Message -----
From: "Buhwana"
To:
Sent: Monday, October 09, 2006 6:34 AM
Subject: [fairchildclub] moving crankshaft

>i have a PT-19 with the 200 hp ranger engine. After flying for an
> hour yesterday and while inspecting the prop I gave it a tug and to
> my surprise i was able to move it about 1/2 inch forward as if the
> entire shaft was moving within the engine. The engine was warm and I
> have yet to try it when it's cold, but is this normal. Is there a
> tolerance that that crankshaft can move within the engine?
> Tom
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

'

Tom Mueller · Post by **Tom Mueller** » Mon Oct 09, 2006 9:13 am

'Tom,
I encourage you to have the engine checked by a mechanic. It's good
that you caught this. The max end play (in and out travel while
pulling out on the crankshaft) is .015. Engine overhaul is mandatory
if more than .015 However,
I had a similar problem. I felt some looseness while pulling on my
wood prop. After doing a complete tear down of the propeller I found
a damaged rear cone, a damaged rear cone seat, compression bolts of
the wrong length and the whole thing was improperly torqued. A prop
overhaul is considerably less expensive than a engine overhaul. Let me
know what you find.
Tom
Hanford,Ca'

John Ellis · Post by **John Ellis** » Mon Oct 09, 2006 9:36 am

'I maintain a PT-19 with the 200hp Ranger and have overhauled several of these engines.

The end play is controled by a bearing and plate, adjusted by shims. I don't remember exact end play, somewhere .010 to .015 i think. Very important, numbers on bearing go towards prop end of crank because of thrust.

You probably have a problem with .500 movement.

John

----- Original Message -----
From: Buhwana
To: fairchildclub@yahoogroups.com
Sent: Monday, October 09, 2006 8:34 AM
Subject: [fairchildclub] moving crankshaft

i have a PT-19 with the 200 hp ranger engine. After flying for an
hour yesterday and while inspecting the prop I gave it a tug and to
my surprise i was able to move it about 1/2 inch forward as if the
entire shaft was moving within the engine. The engine was warm and I
have yet to try it when it's cold, but is this normal. Is there a
tolerance that that crankshaft can move within the engine?
Tom

[Non-text portions of this message have been removed]

'

John Ellis · Post by **John Ellis** » Mon Oct 09, 2006 9:40 am

'I maintain a PT-19 with the 200hp Ranger and have overhauled several of these engines.

The end play is controled by a bearing and plate, adjusted by shims. I don't remember exact end play, somewhere .010 to .015 i think. Very important, numbers on bearing go towards prop end of crank because of thrust.

You probably have a problem with .500 movement.

John

----- Original Message -----
From: Buhwana
To: fairchildclub@yahoogroups.com
Sent: Monday, October 09, 2006 8:34 AM
Subject: [fairchildclub] moving crankshaft

i have a PT-19 with the 200 hp ranger engine. After flying for an
hour yesterday and while inspecting the prop I gave it a tug and to
my surprise i was able to move it about 1/2 inch forward as if the
entire shaft was moving within the engine. The engine was warm and I
have yet to try it when it's cold, but is this normal. Is there a
tolerance that that crankshaft can move within the engine?
Tom

[Non-text portions of this message have been removed]

'

Bob Haas · Post by **Bob Haas** » Mon Oct 09, 2006 6:05 pm

'May be you have a broken crank! There is a big center main bearing that
locates the crank laterally and a big ball bearing

That handles the vertical movement.. Bob Haas

_____

From: fairchildclub@yahoogroups.com [mailto:fairchildclub@yahoogroups.com]
On Behalf Of Buhwana
Sent: Monday, October 09, 2006 9:34 AM
To: fairchildclub@yahoogroups.com
Subject: [fairchildclub] moving crankshaft

i have a PT-19 with the 200 hp ranger engine. After flying for an
hour yesterday and while inspecting the prop I gave it a tug and to
my surprise i was able to move it about 1/2 inch forward as if the
entire shaft was moving within the engine. The engine was warm and I
have yet to try it when it's cold, but is this normal. Is there a
tolerance that that crankshaft can move within the engine?
Tom

[Non-text portions of this message have been removed]'

BOB DUNN · Post by **BOB DUNN** » Tue Oct 10, 2006 1:55 pm

'THERE ARE ALSO SPACERS AT THE THRUST BEARING WHICH MAY
NEED ATTENTION, OR THE THRUST BEARING ITSELF MAY BE
WORN. ALSO, CHECK TO SEE IF THE CRANK ITSELF IS
MOVING. MAY BE THE PROP THRUST NUT NEEDS TIGHTNING. I
BELIEVE IT TAKES ABOUT 600 LBS TORQUE.
BOB DUNN

--- Bob Haas wrote:

> May be you have a broken crank! There is a big
> center main bearing that
> locates the crank laterally and a big ball bearing
>
> That handles the vertical movement.. Bob Haas
>
>
>
> _____
>
> From: fairchildclub@yahoogroups.com
> [mailto:fairchildclub@yahoogroups.com]
> On Behalf Of Buhwana
> Sent: Monday, October 09, 2006 9:34 AM
> To: fairchildclub@yahoogroups.com
> Subject: [fairchildclub] moving crankshaft
>
>
>
> i have a PT-19 with the 200 hp ranger engine. After
> flying for an
> hour yesterday and while inspecting the prop I gave
> it a tug and to
> my surprise i was able to move it about 1/2 inch
> forward as if the
> entire shaft was moving within the engine. The
> engine was warm and I
> have yet to try it when it's cold, but is this
> normal. Is there a
> tolerance that that crankshaft can move within the
> engine?
> Tom
>
>
>
>
>
> [Non-text portions of this message have been
> removed]
>
>

__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com'