UNC Internal Thread Chasers

[andyborris]

Only need a couple of sizes for a Rover V8 engine, can only find big sets at £90 and up!

Any leads or do you have some I could borrow for a day or so? I'm Kent.

Thanks

[v8ian]

What size?

[bricol]

Just buy the UNC taps you need separately - if you aren't actually cutting threads, just chasing, then carbon steel will do.

I would go for HSS personally, then if you do need to use them properly, then you can.

[stealthstylz]

As above. Just buy a couple of bottoming taps the right thread and use those. They're a lot better than thread chasers.

[v8ian]

let me know what you want, I'm in Hastings.

[mk2cossie]

Apr 5, 2023 8:24:34 GMT andyborris said:

Only need a couple of sizes for a Rover V8 engine, can only find big sets at £90 and up!

Any leads or do you have some I could borrow for a day or so? I'm Kent.

Thanks

As said, what sizes? I have a set of UNC thread chasers for internal/external threads.
May also have some UNC taps and dies for lending.

I'm near Ashford if thats any help?

[andyborris]

Apr 5, 2023 20:21:02 GMT v8ian said:

let me know what you want, I'm in Hastings.

Thanks, need 7/16 x 14TPI UNC and 3/8 x 16TPI UNC.

Just want to clean the threads, I've been told that using a tap will cut and loosen the "grip" on the bolt?

Not having much luck with this RV8 engine, some threads stripped as I fitted the inlet manifold to the heads. Have a spare set of heads, but will use studs this time and want to make sure both block and heads have good clean threads.

Getting fed up with changing head gaskets ( third times the charm!).

[andyborris]

Apr 5, 2023 22:27:58 GMT mk2cossie said:

Apr 5, 2023 8:24:34 GMT andyborris said:

Only need a couple of sizes for a Rover V8 engine, can only find big sets at £90 and up!

Any leads or do you have some I could borrow for a day or so? I'm Kent.

Thanks

As said, what sizes? I have a set of UNC thread chasers for internal/external threads.
May also have some UNC taps and dies for lending.

I'm near Ashford if thats any help?

I'm in Ashford, as I said to v8ian need 7/16 x 14TPI UNC and 3/8 x 16TPI UNC.

Won't be for a few days, waiting for parts to arrive from USA. However be nice to meet a fellow local RR'er!

[andyborris]

People on here are the best.

[v8ian]

Found a3/8 and 7/16 unc, one a 1st, ones a 2nd yours if you want them, no issue to grind the tip off so it will go deeper,

[andyborris]

Thanks everybody.

Took some advice, put a slot into a bolt and with some WD40, it worked a treat. Pulled out loads of c**p.

Now waiting for the head studs to arrive from the USA, (hopefully Friday) and then I'll have try number 4 at getting the heads to seal!

Been a bit unlucky with this one.

[bricol]

Apr 5, 2023 22:38:11 GMT andyborris said:

Apr 5, 2023 20:21:02 GMT v8ian said:

let me know what you want, I'm in Hastings.

I've been told that using a tap will cut and loosen the "grip" on the bolt?

Go back and ask how they think the thread was cut(or rolled)  in the first place . . .

There are classes of thread, allowing you to juggle clearances - you might want a tighter fit, or a looser fit to allow things to centralise on datum surfaces etc.   But for general purpose use, a standard tap will be fine.