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64lawnranger

crankshaft thread repair

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64lawnranger

I'm in the process of reassembling my H60, but have come to find that the threads on the end of the crank are a bit messed up....cant get the nut to thread onto it! Is there an easy way to repair these threads?

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sorekiwi

It sounds like someone decided to beat on the end of the crank with a hammer in an attempt to remove the flywheel...

You can buy a "thread file" which has the common pitches on it. It has V shaped file teeth spaced to that specific thread, and you use it to file the rolled over threads straight again.

KD offers one, you can probably get one from an autoparts store. Here's a link to one from a quick google search:

http://www.sjdiscounttools.com/kdt2249.html

Hopefully its just the first one or two threads that are screwed up

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rickv1957

You can get a die and chase the threads and your good to go,Rick

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Kelly

The tread file is the way to go, I have both metric and ase they are invaluble

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sorekiwi

You can get a die and chase the threads and your good to go,Rick

The problem here is that if the end of the crank is mushroomed enough for the nut to not want to start, the die probably wont want to start either...

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64lawnranger

anyone know what size the h60 crank thread is off the top of their head? I"ll try the tap and die tomorrow, I am going to look into the filed. Any advice of getting the die started squarely?

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Kelly

Use a tread file to clean up the end so the die will start.

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linen beige

You can buy a "thread file" which has the common pitches on it. It has V shaped file teeth spaced to that specific thread, and you use it to file the rolled over threads straight again.

KD offers one, you can probably get one from an autoparts store. Here's a link to one from a quick google search:

http://www.sjdiscounttools.com/kdt2249.html

:notworthy:

More info about thread files....

http://www.webbikeworld.com/motorcycle-tools/thread-file/

Good luck.

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tarcoleo

Is there enough threaded portion of the crank end, that is, excess length,

so that you could take an ordinary file and round off the end? If the

the last few threads do not engage the nut after installation, you can

file off those messed up threads or at least allow a die to recut the

remaining threads.

Tom in RI :notworthy:

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pfrederi

One of the most useful items in my shop is a thread restorer set from sears. It has NC, NF and metric nut and bolt thread restorers and also has two thread files. It is a life saver working on old rusty nuts and bolts making them reusable.

Thread restore set

Other are correct use the thread file first to dress the threads then your thread chaser or die will start square

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64lawnranger

Thanks guys, chased the threads with a file and finished them off with a die....works great!

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