Inch Thread in Power Steering Pump - Please Kindly Verify What I Found

[Pawel66]

I have a kind request to verify: the thread in the bolt holding the PS pump to bracket (the one protruding through pump housing) is 3/8 UNF. Spanner 14mm fits, but the bolt is 3/8 inch.

This is what I could find on the forum. Is it correct?

I checked and it fits 9.5mm thread, so I hope it is correct.

Any hints where to source this bolt? EPC does not help....

[WRe]

Hi,
see here: https://www.sl113.org/forums/index.php?topic=24210.msg173445#msg173445.
...WRe

[Pawel66]

WRe, thank you!

I had good 6 pages of hits on search, I have no idea why I have not come across these posts... thanks again!

[Pawel66]

I had to change this post.

Here is what happened: someone sometime screwed in UNF bolt while the pump housing had UNC threads. That is how the screw/thread got destroyed.

I cleaned the threaded orifice tonight and the thread that emerged was UNC thread and it fitted UNC bolt. I need to buy a tap or heli coil and fix the thread in the housing. But UNC it is.

[Kevkeller]

Can you use a rethreader?  It’s like a tap but straightens out damaged threads instead of cutting new ones.

[Pawel66]

Thank you for the thought, but I am not sure if I am familiar with how it looks like.... sorry for my ignorance...

Sounds useful. Will look for it.

[MikeSimon]

If you are not a stickler for originality, I would drill and retap the hole and insert a metric thread coil. Will make it easier to replace hardware in the future.
The reason some hardware on the p/s pump is odd, is that it is based on a Vickers US-model VT27/VTM42 power steering pump and some dimensions and specs were taken over unchanged.

[Pawel66]

Yes, crossed my mind, thank you. I thought M10 would be my last resort.

[Kevkeller]

Here is a rethreader kit as an example. It looks like a tap and die set but not as aggressive.

https://www.autozone.com/test-scan-and-specialty-tools/thread-repair/p/oemtools-thread-restorer-set/391372_0_0?cmpid=PLA:US:EN:AD:NL:1000000:TLS:284125247&msclkid=50b7641f6e4c1543ea1b05f2c7fe13f2&gclid=CP-iwpvLyPUCFdoYrQYd_okCdw&gclsrc=ds

[Pawel66]

Ok, got an idea, thank you!