Engine Designation Question
CWLee
LOOK different, but that may be just because certain
non-engine items were rearranged or redesigned between the
1999 model year and the 2000 model year.
Under the hood of the 1999 model the engine is designated
as: 4.0L SOHC.
Under the hood of the 2000 model the engine is designated
as: 4.0L EI/4.0L SOHC/5.0L 4.0 EFI.
(When I say "designated" I mean printed on a label on top of
the radiator, and/or cast into a large piece of plastic on
the top of the engine.)
My question is: Are these two engines the same, or is there
a significant difference between them?
Owner's manual not useful to me for this question.
Thanks.
Jim Warman
every engine available in that year/model (post the 8th digit of the VIN and
someone will chime in... )
Having said that, the 4.0 liter in the Explorer came in two basic flavours.
The earlier design was a push rod (cam in block) engine and the other was
the SOHC (single overhead cam) engine. What can further confuse is that both
engines had their intake manifolds redesigned over time...
Both engines share the same bore spacing and bank separation (60 degrees)
but there are major differences between the tw
"CWLee" <cdub...@post.harvard.edu> wrote in message
news:5K2dnQTjurgsGBnW...@earthlink.com...
CWLee
"Jim Warman" <mech...@telusplanet.net> wrote:
> You'll need to find a different tag for the 2000... you
> have just described every engine available in that
> year/model (post the 8th digit of the VIN and someone will
> chime in... )
Here are the first 8 digits of the VIN codes for each:
1999 VIN Code = 1FMDU34E
2000 VIN Code = 1FMZU62X
Since the 8th digit is different, I assume the engines are
different. In layman's terms, how would you describe each
of those engines as being different than the other, in
addition to what you wrote below?
(Since the 4th, 6th, and 7th digits are also different, what
does that tell us?)
> The earlier design ...
Would that be those with the 8th digit being E?
> ... was a push rod (cam in block) engine and the other was
> the SOHC (single overhead cam) engine.
The term SOHC appears adjacent to both engines, even though
the VIN codes are different - does that tell us anything
significant?
> What can further confuse is that both engines had their
> intake manifolds redesigned over time...
>
> Both engines share the same bore spacing and bank
> separation (60 degrees) but there are major differences
> between the tw
What might those "major differences" be?
Thanks, Jim, for your always helpful replies.
Chuck, who brought his railroad speeder to your town several
years back, but wasn't able to connect with you.
=============================
Jim Warman
engine... (4.0 OHV or overhead valve).
As far as describing each one in laymans terms.... I can only try but there
is going to be an assumption of some knowledge of engine design...
The single overhead cam engine has a camshaft located in each cylinder
head.. In the case of your 1999 4.0, one chain is driven by the crankshft
and, in turn, drives a jackshaft located in the engine block casting in the
same location as the cam in the OHV engine. From the front of this
jackshaft, another chain drives the cam that is located in the left (drivers
side) cylinder head. The jackshaft extends to the rear of the engine, where
another chain is used to drive the camshaft in the right side cylinder head.
In 4X4 vehicles, there is a balnce shaft driven by yet another chain off the
crankshaft. We'll discuss valve actuation in a bit.
In the overhead valve engine, one camshaft is located in the cylinder block
directly above the crankshaft. One chain is used to drive the camshaft.
Valve actuation is achieved by a combined lash adjuster/cam follower which
actuates a pushrod - this transfers the motion to the top of the cylinder
head where a rocker arm is used to reverse the motion opening the valve.
In the OHC engine, the cam follower and lash adjuster are separate.... while
more moving parts are used to turn the cams, less moving parts are used to
transfer the motion from the cam to the valve. Some of Fords more recent
engines us DAMB followers (direct acting metal buckets).
Currently, all Ford production engines use (in North America) either SOHC or
DOHC camshaft arrangements. The soon to be released 6.7 liter Scorpion
diesel engine will be a pushrod engine (difficult to build a OHC diesel with
the amount of stuff competing for real estate in the cylinder head). The 6.4
used in the F Super Duty trucks and the 6.0 used in the E series are both
Navistar produced engines.
Hope this helps some...
Still disappointed we couldn't hook up...
"CWLee" <cdub...@post.harvard.edu> wrote in message
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CWLee
After I read your reply I did some more research, and ended
up at the "Ford VIN Decoder" site, shown below:
https://www.fleet.ford.com/maintenance/vin_tools/default.asp
I entered both the VIN codes, and the Ford site output for
engines is the same for both the 1999 and the 2000, as
follows:
Engine: 4.0 L
Cylinders: 6
Fuel: Gasoline
No mention of one being SOHC and the other being OHV. Seems
strange to me, but then again Ford never asked me to
contribute to this topic. :-)
Again, best regards, Chuck.
================================
"Jim Warman" <mech...@telusplanet.net> wrote in message
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