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post #11 of 17 Old 01-31-2010
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Helicoil on 4 of 5 bolts is unbalanced and could break the crank, eventually, depending on how far out of balance it is will determine how soon it will break. You should have helicoiled all the holes or should have had the local machine shop do the repair. Hopefully you get long life without any problems.
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post #12 of 17 Old 01-31-2010
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The weight of the helicoil will very nearly replace the weight of the threads removed. The unbalanced weight of rebuilt clutches is far in excess of any balance problems caused by a helicoil. I figure that you are still better than new.
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post #13 of 17 Old 01-31-2010 Thread Starter
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Thanks Mechsmith, that was my thought, I am so close to the center of rotation and after having looked @ the quality and precision of the other components in the rotating mass I think the gram or two will not hurt her. My 914-6 with the 2.7 sixer is farther off than that on my new pistons and its swinging @ 180 degrees @ 7k+ rpm!

Josh

I love to sail, coming from a Swordboat capt's loin one would think I'd of caught the bug long before now! Oh well, this ones for you Bisque...(My Father may he RIP)

Now If I could only stay away from working on the damn things I could sail more!
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post #14 of 17 Old 01-31-2010
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Quote:
Originally Posted by degreeoff View Post
Thanks Mechsmith, that was my thought, I am so close to the center of rotation and after having looked @ the quality and precision of the other components in the rotating mass I think the gram or two will not hurt her. My 914-6 with the 2.7 sixer is farther off than that on my new pistons and its swinging @ 180 degrees @ 7k+ rpm!

Josh
You are comparing apples to oranges. The helicoils unbalancing the crank flange is rotational (like an unbalanced tire)with no support on one end where a piston is reciprocating and is supported on either end by the main bearings/bores. Would you take a chance and helicoil your 914-6 crank helicoiling four out of five bolt holes at 7k+ rpm? probably not.
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post #15 of 17 Old 02-03-2010
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Thanks for the information. I have our M25 out and on the engine stand to start the rebuild. More fun!

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post #16 of 17 Old 02-07-2010
 
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wow you're havin too much fun. I bought the "cat 30 in need of refit" last year and had a ball doing her up. I have solved a lot of problems along the way let me know if I can help. we love our boat so keep at it
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post #17 of 17 Old 02-07-2010 Thread Starter
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Heya NC, Yeah I have a hell of a project here. I am going to start my resto thread with a link to my web site and pics. To give you an idea of how far I am going you'd have to imagine a TOTALLY strpiped vessel. I mean the only things left inside are the 120v electric lines + panel (temp as I am going with new blue seas equip), thru hulls, waste tank, exhaust hose and waste hose (the big one) everything else is OUT. All wood, electrical wire......well everything! It will cost me about 15k when I am done.

I love to sail, coming from a Swordboat capt's loin one would think I'd of caught the bug long before now! Oh well, this ones for you Bisque...(My Father may he RIP)

Now If I could only stay away from working on the damn things I could sail more!
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Current boat...
-1985 c-30 TR DONE!! after two new engines and too much labor she floats sails and steams....
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