I noticed that my engine block blanking plate has 1 flat
head posidrive screw and 6 hex head bolts . I thought the
PO change it but realized from other posted photos and
major suppliers parts list that this is correct.
Does anyone know why Jaguar did this ?
Thank you.–
Mark 69 E SII OTS
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
That is strange. Last time I pulled my engine I removed it to replace the gasket, which it didn’t need. But I wanted to see the block innards underneath. Looked great, was really hard to get the plate off without damage.
LLoyd
“What terrifies religious extremists like the Taliban are not American tanks or bombs or bullets, it’s a girl with a book.”
Malala Yousafzai----- Original Message -----
I noticed that my engine block blanking plate has 1 flat
head posidrive screw and 6 hex head bolts . I thought the
PO change it but realized from other posted photos and
major suppliers parts list that this is correct.
In reply to a message from LLoyd (a rithmetician) sent Sun 5 Jul 2015:
Do you happen to remember if your block blanking plate also
had one flathead posidrive screw ? All the ones I’ve seen,
including mine, are positioned midway on the plate towards
the exhaust side.
Regards,–
Mark 69 E SII OTS
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Boffi sent Sun 5 Jul 2015:
Confirmed. The plate will fit in only one position. The
pozidriv screw is at nine o’clock and iirc there is a tapered
hole in the plate that accommodates it.–
The original message included these comments:
Do you happen to remember if your block blanking plate also
had one flathead posidrive screw ? All the ones I’ve seen,
including mine, are positioned midway on the plate towards
the exhaust side.
–
Nick Saltarelli '68 Cdn mkt E-type S1� OTS, '54 XK120SE OTS
Niagara, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Boffi sent Sun 5 Jul 2015:
Mark
Same thought on my 70 Series II. Could not figure out the logic of
using one odd fastener. Don’t remember if I put the flat head
screw back in or not.
The company where I work I often ask the question why something is
done in such a way? Answer: ‘‘That’s how we have always done it’’
That may well apply here.
Glenn
70 E–
The original message included these comments:
I noticed that my engine block blanking plate has 1 flat
head posidrive screw and 6 hex head bolts . I thought the
PO change it but realized from other posted photos and
major suppliers parts list that this is correct.
Does anyone know why Jaguar did this ?
–
melloyello
Lake Elsinore California, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Boffi sent Sun 5 Jul 2015:
My college summer job was in an automotive assembly plant
which included parts like this secured by multiple screws.
One possibility is that the plate was first located by
affixing it with one screw (the Posidrive) then in a
subsequent assembly step all the other screws were driven
in using a multi-head impact wrench that did the remaining
six all at once.
That is, of course, mere speculation and the assembly line
I worked on was likely moving much faster and using smaller
tasks than what Jaguar would have done.
It is an interesting puzzle.–
The original message included these comments:
Just makes me wonder why. Maybe a necessary step/need for
–
Geo Hahn 1969 OTS 4.2
Mt Lemmon, Arizona, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Boffi sent Sun 5 Jul 2015:
Don’t know for sure but since there is no mechanical advantage
to having the screw v the bolts I expect it was an assembly
line efficiency. The plate goes on only one way. The tapered
hole in the plate fits the tapered head of the pozidriv screw.
It could be the plate was positioned by hand using the screw,
aligning the holes of the plate with the threaded holes in the
block and allowing the remaining six bolts to be put in
quickly with an impact driver. Speculation.–
The original message included these comments:
Any clue to why this was done by Jaguar ?
–
Nick Saltarelli '68 Cdn mkt E-type S1� OTS, '54 XK120SE OTS
Niagara, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
I remember one “oddball”, but don’t remember where it was. I’m ssure it is there for a reason… rear oil line maybe??
LLoyd
“What terrifies religious extremists like the Taliban are not American tanks or bombs or bullets, it’s a girl with a book.”
Malala Yousafzai----- Original Message -----
In reply to a message from LLoyd (a rithmetician) sent Sun 5 Jul 2015:
Do you happen to remember if your block blanking plate also
had one flathead posidrive screw ? All the ones I’ve seen,
including mine, are positioned midway on the plate towards
the exhaust side.
“What terrifies religious extremists like the Taliban are not American tanks or bombs or bullets, it’s a girl with a book.”
Malala Yousafzai----- Original Message -----
In reply to a message from N�ck sent Sun 5 Jul 2015:
In reply to a message from LLoyd (a rithmetician) sent Sun 5 Jul 2015:
I was also going to suggest that it might have something to
do with clearance. On XJ6 cam covers, one fastener on each
side is an oval head pozidrv, presumably to provide more
clearance to the bonnet. The rest are the usual studs with
tall acorn nuts.–
The original message included these comments:
Perhapss to clear the oil line… ???
–
Bob Wilkinson, 73 XJ6
Saint Louis, MO, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Robert Wilkinson sent Sun 5 Jul 2015:
No clearance issues.
The original message included these comments:
I was also going to suggest that it might have something to
do with clearance. On XJ6 cam covers, one fastener on each
side is an oval head pozidrv, presumably to provide more
clearance to the bonnet. The rest are the usual studs with
tall acorn nuts.
–
Nick Saltarelli '68 Cdn mkt E-type S1� OTS, '54 XK120SE OTS
Niagara, Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from N�ck sent Sun 5 Jul 2015:
These blocks were used in multiple applications so there
might be reasons nothing to do with the E-type. Thry
started out with a simple Welch washer and moved to the
early ‘arched’ plate with six hex head setscrews and only
later to the larger plate with six hex and one Pozidriv.
The fact it’s a countersunk screw argues against the
thought that it was to hold a P clip or some other widget
for sedan wiring or tubing.–
1E75339 66 D, 1R27190 70 FHC, 79 S2 XJ12L
Gaithersburg, Maryland, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from PeterCrespin sent Mon 6 Jul 2015:
Maybe it was thought up by the publicity department to keep
us talking about the car for many years into the future.
Give that man a medal.
Ian–
The original message included these comments:
These blocks were used in multiple applications so there
might be reasons nothing to do with the E-type. Thry
started out with a simple Welch washer and moved to the
early ‘arched’ plate with six hex head setscrews and only
In reply to a message from riv944 sent Mon 6 Jul 2015:
While scratching my head over this issue I reasoned that
maybe, since the other hex headed screws are fully threaded,
the use of the counter sunk screw helped to positively
locate the plate? In other words, could the one counter sunk
head help to prevent the plate from sliding a mil or two
thereby inducing a leak?
A question for wiser heads.–
Craig Gilbert - '68 E-Type FHC - RIP
Birmingham, AL, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
Scratching my head over it too. Looked at mine yesterday, there is no interference with anything to need a countersunk screw.
The gasket is big enough that it doesn’t need that precise an alignment, just a flat plate on a flat area.
LLoyd
“What terrifies religious extremists like the Taliban are not American tanks or bombs or bullets, it’s a girl with a book.”
Malala Yousafzai----- Original Message -----
In reply to a message from riv944 sent Mon 6 Jul 2015:
While scratching my head over this issue I reasoned that
maybe, since the other hex headed screws are fully threaded,
the use of the counter sunk screw helped to positively
locate the plate? In other words, could the one counter sunk
head help to prevent the plate from sliding a mil or two
thereby inducing a leak?
A question for wiser heads.
Craig Gilbert - '68 E-Type FHC - RIP
Birmingham, AL, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
