VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 05-27-2018, 10:38 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 643
Default Prop Clocking

About to install the prop and read all the related threads. Any reason to not clock the prop at 9-3 position relative to #1 TDC?
__________________
Ser 104142, RV-14A
N1463
Final Assembly....
Reply With Quote
  #2  
Old 05-27-2018, 10:45 AM
jabarr jabarr is offline
 
Join Date: Sep 2008
Location: Fayetteville, Georgia
Posts: 186
Default

The prop can only be installed 2 ways. They are 180 degrees apart. Look at the bushing lengths and recesses in prop hub.
Reply With Quote
  #3  
Old 05-27-2018, 10:45 AM
Nova RV Nova RV is offline
 
Join Date: Aug 2015
Location: Leesburg, VA
Posts: 264
Default

Remember to align the crankcase split with the TDC marking on the BACK of the "flywheel", not the mark on the front. As far at 9-3 clocking I think it's another primer wars type issue.
__________________
Chris Moon

Leesburg, VA
RV-14A kit # 140243 (flying as of 11/18)
VAF 2018 and 2019 paid
www.mykitlog.com/chrismoon/
Reply With Quote
  #4  
Old 05-27-2018, 11:27 AM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 643
Default

Ok I'll look at the flywheel. On the front of the flywheel one hole is marked "O" and it is lined up with a similar "O" on the crankshaft flange. It is the way it was shipped. I'm assuming that is the correct alignment?
__________________
Ser 104142, RV-14A
N1463
Final Assembly....
Reply With Quote
  #5  
Old 05-27-2018, 11:31 AM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,144
Default

Quote:
Originally Posted by JDA_BTR View Post
Ok I'll look at the flywheel. On the front of the flywheel one hole is marked "O" and it is lined up with a similar "O" on the crankshaft flange. It is the way it was shipped. I'm assuming that is the correct alignment?
Never assume anything! Do as Chris says, but make sure that #1 cylinder is at TDC.
__________________
Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor/Nat'l Test Pilot School
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
FRIEND of the RV-1
Eagle's Nest Mentor
Recipient of Wright Brothers "Master Pilot" Award
Reply With Quote
  #6  
Old 05-27-2018, 02:25 PM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 685
Default Beware !

Some extensions are such that you cannot achieve prop alignment with the crank/rods at TDC. The reason is the prop bolts cannot align with crankflange bolts due to space constraints. Mine are 30* OFF. Just FYI, YMMV
__________________
Larry DeCamp
RV-3B flying w/ carb & Pmags
RV-4 fastback w/ Superior EXP 0360 /AFP & CPI
Clinton, IN
Reply With Quote
  #7  
Old 05-27-2018, 04:53 PM
rockwoodrv9 rockwoodrv9 is offline
 
Join Date: Dec 2011
Location: Meridian ID, Aspen CO
Posts: 2,456
Default

Are we talking all props need to be clocked correctly? My instructions for my 3 blade Catto didn't say anything about clocking it in any particular place. This may be another thing a non AP builder would not know.
__________________
rockwoodrv9a
Meridian Idaho
rockwoodrv9a@gmail.com
O-320 D2A
Awaiting DAR Inspection
Reply With Quote
  #8  
Old 05-27-2018, 05:18 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 643
Default

As above there are only two possible fittings. The flywheel bushing at 0 mark is not protruding and so is the bushing 180 from it. The prop mount has 5 recessed spaces and only one bolt without a recess. So the bolt without the recess has to be at the 0 or 180 from it. So the prop clocking is fixed in the big picture. Im going to put the bolt with no recess with the 0 hole. It is the only different hole on the flange marking wise so Im going to match the marked/different items.
__________________
Ser 104142, RV-14A
N1463
Final Assembly....
Reply With Quote
  #9  
Old 05-27-2018, 05:24 PM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,144
Default

Quote:
Originally Posted by JDA_BTR View Post
As above there are only two possible fittings. The flywheel bushing at 0 mark is not protruding and so is the bushing 180 from it. The prop mount has 5 recessed spaces and only one bolt without a recess. So the bolt without the recess has to be at the 0 or 180 from it. So the prop clocking is fixed in the big picture. Im going to put the bolt with no recess with the 0 hole. It is the only different hole on the flange marking wise so Im going to match the marked/different items.
This may be true with your engine and prop. It is not true on all engines and all props.
__________________
Mel Asberry..DAR since last century
A&P/EAA Tech Counselor/Flight Advisor/Nat'l Test Pilot School
Specializing in Amateur-Built and Light-Sport Aircraft
<rvmel(at)icloud.com>
North Texas (8TA5)
RV-6 Flying since 1993, 172hp O-320, 3-Blade Catto (since 2003)
Legend Cub purchased 12/2017
FRIEND of the RV-1
Eagle's Nest Mentor
Recipient of Wright Brothers "Master Pilot" Award
Reply With Quote
  #10  
Old 05-27-2018, 06:11 PM
JDA_BTR JDA_BTR is offline
 
Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 643
Default

Agreed. Im using the Lycoming io390 thunderbolt specd for the 14 with the recc Hartzell c/s prop.
__________________
Ser 104142, RV-14A
N1463
Final Assembly....
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 11:09 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.