Author Topic: Crank thread help please (Read 1315 times)

Taipan · « **on:** May 29, 2011, 11:38 AM »

Had a OPC crank re-chromed but the chromer has chromed up to the first part of the thread a bit to much

,I think I need to have it re-cut,can anyone help or advise,thanks

MartyC · « **Reply #1 on:** May 29, 2011, 12:01 PM »

Thread the pedal in from the other side that should help clean the thread out

oldtired · « **Reply #2 on:** May 29, 2011, 12:04 PM »

pedal or bb thread?

MartyC · « **Reply #3 on:** May 29, 2011, 12:09 PM »

Quote from: oldtired on May 29, 2011, 12:04 PM

pedal or bb thread?

AHA! Didn't think of that

If it is the BB, then a little patience and some lube will be required but you should be able to clean the thread out using the BB nut failing that you may need to go to a machine shop and see if they have a thread cutter they can run over it for you to clean the thread up

.

Taipan · « **Reply #4 on:** May 29, 2011, 12:15 PM »

yep its the bb thread,cant do it with the bb nut its really tight and seems to be making it go on cross threaded if I pushed it? the threads are perfect bar the first one

Gnarlyscoots · « **Reply #5 on:** May 29, 2011, 12:16 PM »

If its a pedal thread that needs clearing, do as below but be careful as you do as you might find the chrome will crack

Other than that, get this http://cgi.ebay.co.uk/ROEBCUK-1-2-UNF-SECOND-TAP-20-TPI-USED-MINT-/220789441083?pt=LH_DefaultDomain_3&hash=item336813823b

I,m sure that pedals are 20TPI (20 threads per inch)

This will do the job better than risking fooking up ya pedal thread

Gnarlyscoots · « **Reply #6 on:** May 29, 2011, 12:20 PM »

KK

was writing that when new post appeared

What size diameter is the thread

Taipan · « **Reply #7 on:** May 29, 2011, 12:57 PM »

havent a clue?

oldtired · « **Reply #8 on:** May 29, 2011, 01:13 PM »

if you have got or know any one with a buffer , theres a plenty of members on here with em one might be near by, use some first cut compound to tidy up the thread where the chrome has gone over , should be able to clean up the thread, tape the crank to protect the arm, finnish of with the normal other two compounds to shine up the the thread again