damaged threads

[dry dock]

the threads are stripped out to the crank - can't re install haromic balancer, would a insert work? has this been done before .

 

[Bondo]

Re: damaged threads

Ayuh,...

A Properly installed Heli-coil should work Just Fine,... It's done everyday...

 

[Bt Doctur]

Re: damaged threads

Seems like this it happening a lot lately due to inproperly pulling the balancer.
We need a sticky to address this
You CANNOT remove a balancer UNLESS you protect the crank threads with a insert or use the crankbolt minus the washer to remove the balancer.
Retap to clean the threads up, Heli-Coil with RED Loc-tite, or plan on replacing the crank.

 

[Don S]

Re: damaged threads

Seems like this it happening a lot lately due to inproperly pulling the balancer.
We need a sticky to address this

The ones that have this problem don't read stickies before they remove the balancer.

 

[betayv]

Re: damaged threads

hi there I have the same problem couple of days before and I will recommend the first thing is to check is that you have the right bolt the size of the bolt if is a mercruiser according to them is 7/16 20 if is the right size try using first a tap to clean the thread if dont work do what bond-o
say.

 

[picklenjim]

Re: damaged threads

NOTE:You can even put in more than one heli-coil if you want more threads in there!

 

[mkast]

Re: damaged threads

NOTE:You can even put in more than one heli-coil if you want more threads in there!

Try using the correct length coil.

 

[a70eliminator]

Re: damaged threads

I just don't get how you can strip the thread in a crank snout, granted damage can occur when applying the puller directly on the snout but that damage is only superficial to the very end, these threads go deep into the crank, I've even seen snouts that had been beat on with a hammer yet the threads survive with nothing more than running a tap, I have lots of taps and use them all the time to get crud out of threads, don't mistake a pulled thread on the bolt for crank thread damage. I've never seen a thread actually stripped beyond the first two or three on a crank snout. Oh wait a minute we're talkin Chevy here so disreguard all I said.

 

[sebago_kid]

Re: damaged threads

I agree with the heli-coil... awesome invention, used everywhere in just about every imagineable situation. They are a life-saver, and I wouldn't hesitate to use 'em. I'm not a marine mechanic, but have used them quite alot in industrial applications. If you don't see the threads coming to a point... if they're flattened or missing, redrill, tap, and helicoil. You need proper thread engagement.

 

[a70eliminator]

Re: damaged threads

Yep, an be prepared for that bit bite in and torque your wrist around till you can't let go the drill, and worst scenerio the bit breaks off in the crank then you'll really be sick.

 

[J JACKSON]

Re: damaged threads

yea you really gotta watch when drilling and taping a crank i just did one and it was tough drill kept hanging and the tap was real hard to turn (and it was new). so be careful don't brake the drill or the tap

 

[bigskiohio]

Re: damaged threads

slow rpms on drilling ,use oil, back tap out often,might have to use right angle drill for room. helicoils are stronger then oringinal threads. make sure you are straight ,take it slow. Im not a boat mech ,but a machinist with auto
background.

 

[dry dock]

Re: damaged threads

thanks for all the replys this is a great site. the boat is 30 years old os i look on hear alot its a great resource.