Diff bolt thread size

Simonjrwinter · Post by **Simonjrwinter** » Sun Dec 01, 2019 5:37 pm

Could someone tell me the thread size of the four bolt that go into the top of the diff please? I want to order a tap to clean out the threads of a diff that’s been standing for a while.
Thanks

Simon

Robbiee · Post by **Robbiee** » Mon Dec 02, 2019 2:08 pm

Hi
They’re large and coarse!
Not sure of the thread/type
I didn’t tap mine but used a small wire brush on a drill which got any muck/rust out
Robbie

Post by **mgcjag** » Mon Dec 02, 2019 3:14 pm

Get yourself a thread guage...quite cheap and will come in really handy....Steve

neal herridge · Post by **neal herridge** » Mon Dec 02, 2019 5:49 pm

They are UNC will check tomorrow but they are ether 1/2" or 7/16" UNC.
Neal.

PeterCrespin · Post by **PeterCrespin** » Mon Dec 02, 2019 11:02 pm

A new, bolt would be cheaper than a 1/2" 13 tpi tap, IMO. Cut some slightly helical slots in an old bolt (try to mimic the flutes and cutting edges of a tap) and use the slotted bolt as a thread chaser. Not only cheaper but kinder, with little/no chance of removing material beyond the original threads - unlike a brand new sharp tap.

Sometimes, less is more.

Series1 Stu · Post by **Series1 Stu** » Mon Dec 02, 2019 11:19 pm

Add a little grease to pick up the debris and the job's done!

Works well in spark plug holes too.

Regards

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Diff bolt thread size

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