Tracing an original engine

kgb123 · Post by **kgb123** » Thu Jul 30, 2015 7:36 pm

I know this is a long shot but I'm wondering if anyone has managed to track down an original engine block for a car with the wrong engine in.

My engine is not original. 7E 54221-9 has at some point in the past been replaced by 7R 1168-9, a series II engine. I've no documentation dating back before 1982 so suspect the engine was replaced sometime before then.

From my research the engine is essentially the same as the original, but it's not the original!! Searched the engine number on XKE Data, but only hit refers back to my entry.

Chances are the original was knackered and replaced, but if anyone has had any success with this kind of hunt, I'd welcome any advice on other search avenues.

Kev

PeterCrespin · Post by **PeterCrespin** » Fri Jul 31, 2015 12:03 pm

Jaguar Heritage archives can be searched by engine number. There will probably be a small fee but why not, since it supports their existence?

Pete

abowie · Post by **abowie** » Fri Jul 31, 2015 8:49 pm

kgb123 wrote: My engine is not original. 7E 54221-9 has at some point in the past been replaced by 7R 1168-9, a series II engine. I've no documentation dating back before 1982 so suspect the engine was replaced sometime before then.

From my research the engine is essentially the same as the original, but it's not the original!!
Kev

Probably because it was uneconomical to repair. Sadly, that probably means it went to the tip.

WRT it being the same as the original it is likely that your new engine is long stud not short stud. I'm not sure what visible external differences there are between the two block types.

PeterCrespin · Post by **PeterCrespin** » Fri Jul 31, 2015 9:10 pm

abowie wrote:WRT it being the same as the original it is likely that your new engine is long stud not short stud. I'm not sure what visible external differences there are between the two block types.

All long stud blocks have a core plug at the base of the ten long studs, five per side. S3 XJ engines also have additional ribbing. The short stud blocks have fewer large plugs (three per side plus other odd ones IIRC).

abowie · Post by **abowie** » Sat Aug 01, 2015 7:30 am

I knew someone would know!

PeterCrespin · Post by **PeterCrespin** » Sat Aug 01, 2015 10:58 am

There are other traits and you can usually tell from any angle (length of head, plate at back of block etc.), but counting core plugs is definitive.

kgb123 · Post by **kgb123** » Sun Aug 02, 2015 9:00 am

Thanks, will investigate the Jaguar Heritage suggestions and take a look at my core plugs. Just had the engine completely overhauled so everything is easily accessible and squeaky clean.
Kev

Dawnpatrol · Post by **Dawnpatrol** » Sun Aug 09, 2015 10:48 pm

[quote=
All long stud blocks have a core plug at the base of the ten long studs, five per side. S3 XJ engines also have additional ribbing. The short stud blocks have fewer large plugs (three per side plus other odd ones IIRC).[/quote]

I read your message above a few days ago Peter and thought I'd double check before replying.
Not all long stud blocks have 5 core plugs on the exhaust side.
My friends early Series 2 2+2 (late 68 build) is currently in strip down. The long studs are really knackered and we are having to use specialist milling gear to get them out.
Only 3 core plugs on exhaust side.
It is the cars original engine, has a series 1 oil filter housing which I've no reason to believe is not original to the engine.
Some sort of crossover point I think?
Regards.

abowie · Post by **abowie** » Sun Aug 09, 2015 11:55 pm

Dawnpatrol wrote:[ The long studs are really knackered and we are having to use specialist milling gear to get them out.

Personally I'd probably just find another block.

Dawnpatrol · Post by **Dawnpatrol** » Wed Aug 12, 2015 12:34 pm

My previous career was Aeronautical Engineering, so, for the moment, there is more "fun" to be had messing with the original and it will be quite satisfying if it can be recovered.
IMO, keeping the original has to be worth it......
However it may run out our patience

PeterCrespin · Post by **PeterCrespin** » Wed Aug 12, 2015 3:33 pm

If someone has a long stud block in front of them, with only three core plugs on the exhaust side, then it's clear there must have been some kind of transitional block. Since many (daren't say 'all') relevant blocks have a date cast into them it would be interesting to know when it was cast and ehat the cast part number was. The various versions will doubtless be traceable through part number listings but my eyes glaze over at the unillustrated pages of part numbers one sees for S1.5/2 models.

My long stroke block needed a helicoil but I wouldn't fancy repairing a block 'blind' without a core plug.

Dawnpatrol · Post by **Dawnpatrol** » Tue Aug 18, 2015 5:50 pm

OK. Embarrassing duff info retraction and apologies to Peter.

(PM on its way.)
Due to a combination of crossed wires and pictures of the wrong block I was wrong about this block only having 3 core plugs, it has 5 on the exhaust side, as per Peters original post.
I went to the engineering shop get the casting date to pass on and realised the photo error.
Teach me to check thrice not twice.
Off to eat some more humble pie.

Dons tin hat etc!

PeterCrespin · Post by **PeterCrespin** » Wed Aug 19, 2015 2:02 am

No sweat, thanks for reporting back for the record.

So long as you didn't have to eat regular doses of HP in your previous aeronautical career! ;-)

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