[xj] XJ6 vibration when taking off from a dead stop

XJ
1

Hello, I have been noticing this in the past but just ignored it.
When I take off from a stop sign their is a 1-2 second vibration
coming from under the car that vibrates. Any ideas what causes
this and is their any real worries? Once the car is rolling on the
road their is no vibration just smooth saling.

JR 1984 XJ6 III–
JR
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2

In reply to a message from JR sent Thu 9 Oct 2003:

Difficult to diagnose without hearing the vibration check
rear gearbox mounting or exhaust touching bodywork under
staring torque as you pull away. basically check under car
for anything loose, there are some panels screwed to the
u/s maybe some screws are missing.–
Keith Turner '79 XJ6 based Aristocat, , '81 3.4 XJ6
Swansea, United Kingdom
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3

JR, this can be engine mounts, or either the rear mount for the trans or the
centering mount for the driveshaft, farther back. They have rubber parts that
can deteriorate.–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

JR wrote:

Hello, I have been noticing this in the past but just ignored it.
When I take off from a stop sign their is a 1-2 second vibration
coming from under the car that vibrates. Any ideas what causes
this and is their any real worries? Once the car is rolling on the
road their is no vibration just smooth saling.

===================================================
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4

In reply to a message from Cannara sent Thu 9 Oct 2003:

Have you checked the u-joints?–
Maynard 91XJS 86XJ6 78MGB 67MGB
Niles, IL, United States
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5

In reply to a message from JR sent Thu 9 Oct 2003:

Sounds like the center drive shaft bearing is going,
and might check and replace the 3 U joints at the
same time.
Walter Schuster–
Walter Schuster 69E/78XJ6
Albuquerque/New Mexico, United States
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6

In reply to a message from 69/78 sent Fri 10 Oct 2003:

Hi
I have something similar happening except I get a pronounced
rumbling when pulling away. Some folks have suggested the center
joint (bearing??), possibly the rear diff.

I was poking around under the spare car today (87) preparing to lug
out the engine and transmission, so I was trying to work out how to
disconnect the drive shaft that is hidden behind those panels
someone mentioned. I’m wondering which end is easiest to attack
from to disconnect the shaft (huh huh huh, he said shaft). There is
a thick plate underneath the very back of the tranny. I took out
about 40 bolts (actually I guess it was about 6) but found that
this plate is also held on by a couple of laterally-mounted bolts
that I can’t get at with a socket. (this isn’t the one that holds
the back of the tranny under that big spring, it’s right behind
that one). But even if I could get that plate off, I don’t think I
can get to all the bolts holding the drive shaft to the
transmission. Maybe there is an easier way to get one end or the
other off?–
Phil Moseley
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7

In reply to a message from Phil Moseley sent Fri 10 Oct 2003:

I recently removed my drive shaft and hade it overhauled ( center
replaced, ujoints replaced, and balanced).You can remove the 4
bolts holding the driveshaft to the tanny flang with a long
extention across the plate and jamming a ratchet or air ratchet up
in the small gap between the plate and the thin shroud.The good
driveshaft eliminated all of my vibration problems. 87 xj6vp–
anthony stavinoha
alvin, United States
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8

In reply to a message from JR sent Thu 9 Oct 2003:

I believe that information in the archives says that this condition
is usually caused by the driveshaft carrier bearing being out of
alignment. It is easily adjusted by loosening the 2 bolts on the
plate beneath it, and prying it over. Often the correct position is
all the way to the right side of the car, or close to it, and it is
a question of trial and error to get it right.

Cheers–
The original message included these comments:

Hello, I have been noticing this in the past but just ignored it.
When I take off from a stop sign their is a 1-2 second vibration
coming from under the car that vibrates. Any ideas what causes
this and is their any real worries? Once the car is rolling on the
road their is no vibration just smooth saling.

–
Larry Karpman
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

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9

Ok, so I haven’t checked the Haynes manual, which may have more detail
than the workshop manual (don’t have access to it, or the car, right now).
I have, however, worn my eyes out on the parts and service manuals
(PDFs).

The ‘drain the radiator’ instructions are pretty simple – remove the
radiator drain plug (which I’m assuming I can find underneath the
radiator) and remove the engine block drain plug.

So where IS the engine block drain plug? The closest I’ve come is a
couple of mysterious what-look-like-plugs on the intake side of the
block…–

  • bill
    '84 XJ6 (Julia)

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10

G’day Bill,

It all a lie! There is no ‘radiator drain plug’ on a SIII. The SII had a
drain plug fitted into the bottom of the transmission oil cooler, which lies
beneath the radiator, but the SIII cooler is a different design and has no
such plug. You have to undo a hose clamp and ease off a hose end.

The engine drain plug is on the exhaust side between the dipstick and the
auto transmission flange and is usually a brass bolt, though it could be
painted and difficult to detect.

The plugs on the intake side are end plugs to the oil galleries going to the
main bearings. Undo one you’ll get oil, not water. Well, hopefully not
water! :-))

I wouldn’t waste money on a Haynes manual.

Regards,
Jeff Watson.> Ok, so I haven’t checked the Haynes manual, which may have more detail

than the workshop manual (don’t have access to it, or the car, right now).
I have, however, worn my eyes out on the parts and service manuals
(PDFs).

The ‘drain the radiator’ instructions are pretty simple – remove the
radiator drain plug (which I’m assuming I can find underneath the
radiator) and remove the engine block drain plug.

So where IS the engine block drain plug? The closest I’ve come is a
couple of mysterious what-look-like-plugs on the intake side of the
block…

–

  • bill
    '84 XJ6 (Julia)

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11

Hey Bill,

Every time I reply to the list and include you as an addressee the mail
system bounces it saying ‘access denied’ to your email address is. Is you
address correct or is there something screwwy with the mail system?

Regards,
Jeff Watson.===================================================
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12

Jeff: actually, the early Series III (up to and including 1982) DID have the
drain plug in the oil cooler. It was eliminated after that. Sadly the
manuals were rarely updated to include vital pieces of information like
that. And yes, the engine block drain plug is exactly where you say it is,
usually painted black like the rest of the block.
Gregory----- Original Message -----
From: “The Watsons” watto@boztek.com.au
To: “William Watson” cars@thekid.com; “XJ List” xj@jag-lovers.org
Sent: Thursday, October 09, 2003 9:41 PM
Subject: Re: [xj] Engine block drain plug?

: G’day Bill,
:
: It all a lie! There is no ‘radiator drain plug’ on a SIII. The SII had a
: drain plug fitted into the bottom of the transmission oil cooler, which
lies
: beneath the radiator, but the SIII cooler is a different design and has no
: such plug. You have to undo a hose clamp and ease off a hose end.
:
: The engine drain plug is on the exhaust side between the dipstick and the
: auto transmission flange and is usually a brass bolt, though it could be
: painted and difficult to detect.

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13

The Watsons wrote:

Hey Bill,

Every time I reply to the list and include you as an addressee the mail
system bounces it saying ‘access denied’ to your email address is. Is you
address correct or is there something screwwy with the mail system?

I second your experiences, Jeff…:slight_smile:

Being inquisitive I pursued the trail arriving at a spam filter at the
server. Which incidentally doesn’t seem to have an even moderately
trained monkey to respond to enqieries.

So, Bill, if you are wondering why you are not receiving much mail ex
list - and we have plenty for your rather special problems …:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
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14

Dr Gregory Andrachuk wrote:

And yes, the engine block drain plug is exactly where you say it is,
usually painted black like the rest of the block.

What, Gregory - not yellow…?? :slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
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15

Thanks, Jeff - that will save me a lot of time looking for the drain
plug on the radiator. :slight_smile: I love Gregory’s comment about “the manuals
were rarely updated to include vital pieces of information like that”.
(My girlfriend’s comment upon hearing that - “And you do this by choice?”)

The plugs on the intake side are end plugs to the oil galleries going to
the main bearings. Undo one you’ll get oil, not water. Well, hopefully not

That’s exactly why I asked first, Jeff.

I wouldn’t waste money on a Haynes manual.

I haven’t found it useful in any regard thus far, which is why I rarely
think to consult it. But hey, it was cheap, and I don’t mind if it gets
ratty hanging around in the trunk.–

  • bill
    '84 XJ6 (Julia)

P.S. On a separate note, regarding bounced mail, yes I have several,
layered, highly aggressive SPAM defenses in place (an advantage to running
my own servers). I’ve relaxed an older rule that was blocking some of the
.au direct mail, which should help. If I do bounce your mail, please drop
me a hint on-list and I’ll contact you directly to find the problem.

(I am subscribed to the list, and do read all the list traffic. Heck,
I’ve read most of the archives at this point. Jag-lovers keeps limiting
my bandwidth, thinking I’m a spider. )

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16

Bill, now you too see why I painted all these hard to see items yellow! The
SII has a drain plug on the heavy pipe between the hoses under the rad. That
pipe is the trans oil cooler. The SIII has no such drain, so you get to pull
the lower water hose off! The block drain is back above the dipstick hole.–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

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17

Every time I reply to the list and include you as an
addressee the mail
system bounces it saying ‘access denied’ to your email
address is. Is you
address correct or is there something screwwy with the mail system?

It’s a better practice to simply reply to the list itself. The person
will be a member anyway, so they’ll see your message via the list.===================================================
The archives and FAQ will answer many queries on the XJ series…
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18

Bill, now you too see why I painted all these hard to see items yellow!

The painting I understand, Alex - but why yellow? :slight_smile: I have some
flourescent orange spray paint left over from a long-ago project; I could
use that, I suppose. I didn’t know yellow paint was one of the required
Jag tools!–

  • bill
    '84 XJ6 (Julia)

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19

Bill, sure, go wild! I just happen to like satin black, to hide most things,
and yellow to call out orifice closings! See engine photos…

http://www.jag-lovers.org/snaps/snap_view.php3?id=971404360

or…

http://www.jag-lovers.org/v.htm?1060668370--
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

William Watson wrote:

Bill, now you too see why I painted all these hard to see items yellow!

The painting I understand, Alex - but why yellow? :slight_smile: I have some
flourescent orange spray paint left over from a long-ago project; I could
use that, I suppose. I didn’t know yellow paint was one of the required
Jag tools!

===================================================
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20

In reply to a message from JR sent Thu 9 Oct 2003:

And here is something else. I had a vibration on my 1981 S3 on
takeoff. I found a one inch crack in the plate on the subframe that
holds the left side engine mount. When I put my foot down on the
accelerator under load the engine would twice in the enigne bay
more than it should. Took me ages to work it out. But I got it
welded up and my problem was gone. I understand that this is NOT a
comon cause of vibration on takeoff, but it would take you only a
minute to check.
Cheers
Muzz
1981 xj6 (stock)
1981 xj6 (xj8) P76 Leyland–
The original message included these comments:

When I take off from a stop sign their is a 1-2 second vibration

–
Soprano
Wellington, New Zealand
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