[xj40] How to tell 3.6L from 4.0L engine?

Is there a definate way to tell a 3.6L engine from a 4.0L
unit? I know on the XK engines the size was actually cast
into the side of the block. Is there certain identifying
characteristics of 3.6L engines that would definitely show
that it is one size verses another?–
Steven A. DuChene - XJ6VDP XJ6C XJ12C XK120SE 3.8S E-Types
Phoenix, AZ Atlanta GA, NE Oh, United States
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In reply to a message from StevenD57 sent Fri 28 Dec 2007:

Steven,

There is a sticky label on the cam cover which says ‘‘4.0
litre’’ on mine so perhaps the 3.6 litre has an equivalent label.

Of course, you could always check the engine serial number
(on a crankcase web just behind the distributor).

If it starts ‘‘9D…’’ it is a 3.6, and if it starts ‘‘9E…’’
it is a 4.0 litre [’‘A’’ = 2.9 (but that is pretty obvious!)
and ‘‘B’’ is a 3.2 litre]–
The original message included these comments:

Is there a definate way to tell a 3.6L engine from a 4.0L
unit? I know on the XK engines the size was actually cast
into the side of the block. Is there certain identifying
characteristics of 3.6L engines that would definitely show
that it is one size verses another?


Bryan N, '91 Sovereign 4.0 L, RHD
Cambridgeshire, United Kingdom
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In reply to a message from StevenD57 sent Fri 28 Dec 2007:

The 4.0 L engines have a 4.0 sticker on the valve cover, the
3.6 L engines have a Jaguar sticker on the valve cover.

Another good visual clue on the auto transmission cars, the
3.6 has a kick down cable going from the throttle body down
to the transmission, the 4.0 does not.

The 4.0 has the ‘‘Sport’’ or 2/N/S button at the base of the
gear shifter and the 3.6 does not.

Still, has Bryan suggests, the serial number is the most
definitive way to tell since it is possible an engine swap
could have been performed sometime in the past.–
The original message included these comments:

Is there a definate way to tell a 3.6L engine from a 4.0L
unit? I know on the XK engines the size was actually cast
into the side of the block. Is there certain identifying
characteristics of 3.6L engines that would definitely show
that it is one size verses another?


91 XJ6, 93 Sov, 97 Sov – Driveway’s crowded!
Tampa Fl, United States
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