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-   -   Prop Clocking (https://vansairforce.net/community/showthread.php?t=160821)

JDA_BTR 05-27-2018 09:38 AM

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?

jabarr 05-27-2018 09:45 AM

The prop can only be installed 2 ways. They are 180 degrees apart. Look at the bushing lengths and recesses in prop hub.

Nova RV 05-27-2018 09:45 AM

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.

JDA_BTR 05-27-2018 10:27 AM

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?

Mel 05-27-2018 10:31 AM

Quote:

Originally Posted by JDA_BTR (Post 1262842)
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.

Larry DeCamp 05-27-2018 01:25 PM

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

rockwoodrv9 05-27-2018 03:53 PM

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.

JDA_BTR 05-27-2018 04:18 PM

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. I?m going to put the bolt with no recess with the ?0? hole. It is the only different hole on the flange marking wise so I?m going to match the marked/different items.

Mel 05-27-2018 04:24 PM

Quote:

Originally Posted by JDA_BTR (Post 1262912)
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. I?m going to put the bolt with no recess with the ?0? hole. It is the only different hole on the flange marking wise so I?m 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.

JDA_BTR 05-27-2018 05:11 PM

Agreed. I?m using the Lycoming io390 thunderbolt specd for the 14 with the recc Hartzell c/s prop.

JDA_BTR 05-27-2018 06:18 PM

Am I reading the Hartzell install torque table correctly? I think for the four AN4H-4A bolts to the S-603 front spinner bulkhead the torque should be 20-22 ft-lbs but it isn’t explicitly called out like it is for the hub clamping bolts to the spinner plate assembly.

Bavafa 09-08-2018 03:42 PM

Quote:

Originally Posted by JDA_BTR (Post 1262929)
Am I reading the Hartzell install torque table correctly? I think for the four AN4H-4A bolts to the S-603 front spinner bulkhead the torque should be 20-22 ft-lbs but it isn?t explicitly called out like it is for the hub clamping bolts to the spinner plate assembly.

I believe the 20-22 ft-lbs is the value for the AN5 bolts that hold the spinner back plate. I would imagine the AN4 bolts for the front plate would take the standard torque value but please let us know if I am incorrect on this.

Tom023 09-08-2018 04:42 PM

Quote:

Originally Posted by Bavafa (Post 1287031)
I believe the 20-22 ft-lbs is the value for the AN5 bolts that hold the spinner back plate. I would imagine the AN4 bolts for the front plate would take the standard torque value but please let us know if I am incorrect on this.

I installed my prop today and that is how I read it. For the AN5 bolts I also found some variability in the amount of torque to tighten each which I added to the 20 ft/lbs.


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