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-   -   Prop 'pop' always a surprise! (http://www.mastercraft.com/teamtalk/showthread.php?t=56115)

d2jp 07-20-2013 04:44 PM

Prop 'pop' always a surprise!
 
I know the prop is gonna 'pop' off of the tapered shaft with a puller and a little heat, but everytime it does, and I know it's gonna happen..... but it sounds like something just broke real bad:) Keeping the nut on a few turns is key to preventing a big problem!

This time I followed this post and lapped the shaft/prop and it's a noticeble difference even in the feel of the fit when installing the prop. When there is a good surface-to-surface contact - you can feel the difference. Checking mine before lapping I had a pretty high area.

FYI - Prussian Blue by Permatex isn't available in NAPA, Grainer, or any parts store in my area. Even called the machine shops and engine builders and no luck. I used a large Sharpie and it worked great.

Cloaked 07-20-2013 05:17 PM

Quote:

Originally Posted by d2jp (Post 958875)
FYI - Prussian Blue by Permatex isn't available in NAPA, Grainer, or any parts store in my area. Even called the machine shops and engine builders and no luck. I used a large Sharpie and it worked great.

A mechanical piping or component supplier for valves in particular will have a blue check dye. We use it in the nuclear industry to blue-check valve seats to ensure no leakage on a closed / seated valve gate. Same principle..... high or low spots....

.

88 PS190 07-21-2013 09:46 PM

You don't have amazon prime?

Anything like that I just get shipping in 2 days for free off amazon.

I don't think you so much need Prussian blue unless you want to see it, you can just lap it regardless and then fit the prop. Prop is softer than shaft.

d2jp 07-22-2013 04:36 PM

Quote:

Originally Posted by 88 PS190 (Post 959125)
You don't have amazon prime?

Anything like that I just get shipping in 2 days for free off amazon.

I don't think you so much need Prussian blue unless you want to see it, you can just lap it regardless and then fit the prop. Prop is softer than shaft.

In general, I avoid Amazon - just a personal thing with me. But you are correct, lap it for 5-10 minutes and it's gonna be a good fit. The sharpie worked great though. Local machine shop recommended that, or spray paint.

mikeg205 07-22-2013 05:14 PM

alright... help me out here... what is "lapping" or "lap" - my old prop came off easy and new one was snug - I did get some prussian blue...

inquiring minds want to know... :)

Cloaked 07-22-2013 05:57 PM

Quote:

Originally Posted by mikeg205 (Post 959449)
alright... help me out here... what is "lapping" or "lap" - my old prop came off easy and new one was snug - I did get some prussian blue...

inquiring minds want to know... :)

Lapping is typically a machining process to lap or make cuts on high spots of a surface with a cutting lathe. Lapping has become a common term for reducing a high spot in most all applications. Lapping a round (drive) shaft just machines (or laps) it down to specs within tolerance reducing a sticking point where a close fit is desired. Even sand paper and a whisk on a high spot is often called lapping.

I would not worry about a prop / shaft fit unless it were to be a b!tch to fit for some reason or the TIR shows a high spot to prevent a good fit. .

d2jp 07-22-2013 10:57 PM

A little CCOCD thread on prop fitting - interesting in his statement that the taper, not the nut or key hold the prop in place, hence the need for a puller to remove.

http://www.correctcraftfan.com/forum...p-installation

mikeg205 07-22-2013 11:05 PM

After reading this - how many replacement props have been installed without this process.... ;) thanks for the CC thread direct.

d2jp 07-22-2013 11:11 PM

Quote:

Originally Posted by mikeg205 (Post 959578)
After reading this - how many replacement props have been installed without this process.... ;) thanks for the CC thread direct.

Tens of thousands, easily:) Prolly every inboard prop installed at the factory and 99 out of 100 replacements!

Always cool to cruise through the other forums....FYI, thread author had a really cool shaft alignment video:http://www.youtube.com/watch?v=3_w0LvD6gEc

mikeg205 07-22-2013 11:14 PM

Thanks Jack - you really fed my MCOCD tonight.. :)


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