classic car forum header
Classic cars forum & vehicle restoration.
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
How To Register     Posting Photographs     Privacy Policy     F/book facebook.com/oldclassiccar

Thread identification and other questions
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Mechanical Restoration
Author Message
Sid



Joined: 20 Sep 2017
Posts: 74
Location: From whence cometh the mighty Lagonda

PostPosted: Fri Dec 04, 2020 11:38 am    Post subject: Thread identification and other questions Reply with quote

I need to buy a helicoil repair kit for the snapped off cylinder head stud on the V8 Pilot. Did UK Ford use UNC/UNF in those days, or Whitworth?
Using the thread diameter and TPI, and the thread identification chart that can be downloaded from the web I've come up with 7/16" UNC or 7/16" BSW. Both have the same criteria (0.433" diameter, 14 TPI) but obviously a different pitch.

Also, I've discovered the engine number doesn't match the log book. Although the car was manufactured in 1951, it has a 21 stud engine. I thought these were fitted to earlier Pilots, (I could, and probably am, wrong) so I'm wondering if this one has the "wrong" engine.

One last thing, am I obliged to inform DVLA of the different engine number?

Thanks in advance
Back to top
View user's profile Send private message
V8 Nutter



Joined: 27 Aug 2012
Posts: 555

PostPosted: Fri Dec 04, 2020 12:29 pm    Post subject: Reply with quote

Ford generally used UNF/UNC, I think the only time they may have used British threads was on some parts peculiar to British built trucks. Your head stud would be a 7/16 U.N.C. The 21 stud engine is the only one used for Pilots. Although many years ago I did see an ex-police car with a 239 cubic inch (3.9 litre) 24 stud engine. The owner claimed it was original and Ford had built several of these "Police Specials". Another Pilot oddity which I have heard of but never seen was the six experimental prototypes they released for public assessment in 1947. They were fitted with a completely re-designed version of the pre-war 22 horse power engine. It wasn't very good and the government dropped the horse power tax, as a result Ford decided to stick with the old 30 horse power. A long time ago there was supposed to be one of the six 22hp Pilots in the Cheltenham area. It was off the road with a broken engine and no parts were available.
Back to top
View user's profile Send private message
Rick
Site Admin


Joined: 27 Apr 2005
Posts: 21710
Location: UK

PostPosted: Fri Dec 04, 2020 2:56 pm    Post subject: Re: Thread identification and other questions Reply with quote

Sid wrote:
...
One last thing, am I obliged to inform DVLA of the different engine number?

Thanks in advance


I suppose technically you *should* do, it'll probably say on their website somewhere. I would, just to keep the logbook matching the car.

RJ
_________________
Rick (OCC Admin)
Various 1920s-1960s - Austin, Morris, Commer, Dodge etc.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Classic cars forum & vehicle restoration. Forum Index -> Mechanical Restoration All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Forum T&C


php BB powered © php BB Grp.