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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 03-16-2010
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alignment

I am reassembling my drivetrain with good results. I did make one mistake though.

I repainted the transmission and the shaft coupling without marking them on the previous marks as to their orientation to each other. Is this a big deal? They are round with 4 bolts to mate them.

Thoughts, comments ? Thanks
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Old 03-16-2010
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Shouldn't matter, they are not matched in any particular pattern, unless it's something I've never seen before.
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Old 03-16-2010
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As jrd22 says, shouldn't matter. Make sure you do not have any paint on the mating surfaces however.
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Old 03-16-2010
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Originally Posted by Gene T View Post
As jrd22 says, shouldn't matter. Make sure you do not have any paint on the mating surfaces however.
Can you say the reason why?

Regards.
Brad
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Like Gene said, do not paint the metal contact area on coupling flange. Make sure you go through a rigorous alignment process and enjoy your drive train ......
Brad, it doesn't matter considering engine/shaft will be carefully re-aligned, it should be round and no difference on any position. And don't paint, because the paint layer will never be seamless with same thickness nor resistant enough to sustain the aignement for a long period.
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Old 03-16-2010
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Also paint will act as a glue.
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Old 03-16-2010
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Can you say the reason why?

Regards.
Brad
Because a properly fit one piece coupling will have a maximum clearance fit of .001" or better per ABYC P-06 and SAE J-756 standards. Many prop shops go for "better" which puts this hand fitting of coupling to shaft into the ten thousandths.. Any paint will cause the coupling to not fit properly..

If the shaft is keyed, as it should be, the coupling will only go on one way. The connection to the gear box does not matter so long as it is aligned when you're done to be within .003" to .004" using a feeler gauge...
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Well I am glad I asked and thank you for the excellent responses I have come to rely on. I very cleverly painted the whole thing including the face that will but up against the velvet drive ( didn't paint that face though).

How to remove that paint w/o ruiningthe tight tolerances? Its just rustoleum spray, nothing too hard core.
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Well I am glad I asked and thank you for the excellent responses I have come to rely on. I very cleverly painted the whole thing including the face that will but up against the velvet drive ( didn't paint that face though).

How to remove that paint w/o ruiningthe tight tolerances? Its just rustoleum spray, nothing too hard core.
Soak it in a bath of acetone, wipe the paint off, then start over...
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Old 03-16-2010
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I would think you could just wipe it off with acetone. Don't sand it. The hardest part will be the recess (or protrusion) that aligns the shaft flange to the transmission flange.

Gene
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