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A Stationary Engine Enthusiasts Forum


hello from new member billybongo with Petter A

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hello from new member billybongo with Petter A Empty hello from new member billybongo with Petter A

Post by billybongo Sat Oct 10, 2020 10:25 am

Hello everyone, I recently acquired my first stationary engine in the form of a petter A in cosmetically okay condition but devoid of even the slightest compression.
On stripping down I found the exhaust valve badly bent and not seating, in fact at rest is was poking up by about a good 2m from the seat.
That has now been resolved and I have very good solid compression.
There are two cross threaded head studs and wondered what size these would be?...I'm guessing 3/8 BSW but if anyone knows for sure I would appreciate the info.

Thanks.

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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by Woodsman Sat Oct 10, 2020 1:54 pm

Hi and a very warm welcome to the forum.
Post a few pictures in New Projects / Restorations when you are able. As to studs, if they are 3/8" diameter and coarse thread then your guess is probably correct.
I'm away at the moment so cannot consult tables. I'm sure someone else will verify.
I suggest you invest in a set of cheap thread gauges a digital caliper and Zeus tables. Less than £25 all in.
Good luck

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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by Robotstar5 Sat Oct 10, 2020 8:37 pm

Hi Billy, welcome aboard.

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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by billybongo Sat Oct 10, 2020 8:50 pm

Hi Paul & Stuart,
Thank you for your warm welcome.
Sadly I did not take pictures of the bent valve etc , but I will take a few tomorrow as the head and barrel are only loosely fitted, just enough to test for compression.
At the moment I'm waiting on a gasket set,  two replacement studs and an ignition lead, so have made start on the paintwork.
I'll hopefully upload some pics in the next few days.

Regards,

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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by Garak Sun Oct 11, 2020 7:37 am

Welcome sir welcome sign
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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by mattblack Mon Oct 12, 2020 6:32 am

Hello and welcome! welcome sign

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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by billybongo Mon Oct 12, 2020 4:33 pm

Thanks Mattblack and Garak for the warm welcome.
I followed Paul's advice and bought a thread gauge, following which I discover the count to be 20.
Unless I'm mistaken this means the head studs are 3/8 BSF, and have ordered two accordingly.
I'm seriously looking forward to the rebuild once all the bits and pieces arrive.

Regards,

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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by Appletop Mon Oct 12, 2020 6:44 pm

Yes Petter A are BSF, welcome to the group.
Petter were ahead of the game with the BSF, Lister kept using cart thread for a number of years.
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hello from new member billybongo with Petter A Empty Re: hello from new member billybongo with Petter A

Post by maryalice Mon Oct 12, 2020 7:36 pm

Appletop wrote:Yes Petter A are BSF, welcome to the group.
Petter were ahead of the game with the BSF, Lister kept using cart thread for a number of years.

Always the comic Very Happy

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