[x300] X300 Big End Bearings

Having one heck of time finding big end bearings (Y & B) for
1996 4.0 l engine. I am told that Jaguar no longer supports
this engine. Does anyone know if bearings from an earlier year
engine would fit?
Jim Ursulak
Vancouver–
VanJim
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In reply to a message from VanJim sent Fri 5 Mar 2010:

do a search on google with the Jaguar part number you will get
several hits of possible suppliers or equivelent–
Mick Gannon Daimler 4.0 1991, Daimler Six 4.01996 England
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In reply to a message from Mick G sent Sat 6 Mar 2010:

Have just looked at the Jaguar web site some are avaialable some
not also there are different grades identified by colour code, so
you will have to identify which colour you have first then take
those part numbers and search the net.–
Mick Gannon Daimler 4.0 1991, Daimler Six 4.01996 England
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In reply to a message from Mick G sent Sat 6 Mar 2010:

Thanks Mick, but unfortunately the websites show inventory
that doesn’t exist. I’ve tried websites in North America,
UK, Germany and Russia. Anyone who is considering rebuilding
their AJ16 engine should be aware of how difficult these
graded OEM parts are to find.

There is an option that I am exploring though. A local
engine rebuilder has offered to look at the crankshaft and
try to match up some non-OEM bearings he has in his
inventory. Should know in a week or so.

Jim Ursulak
97 X300–
The original message included these comments:

Have just looked at the Jaguar web site some are avaialable some


VanJim
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In reply to a message from VanJim sent Sat 6 Mar 2010:

Try Gregory Wells at Coventry-West. He is the only other person I
know of who has ever looked hard for these shells and AFAIK he drew
a blank too, despite being in the trade. The engines simply don’t
fail often enough to make shell supply a viable option. The cost of
repair is always higher than the cost of swapping to another used
bullet-proof engine. Maybe as the cars age someone might make a
batch but then what grade or undersize? Tricky.

Did you actually have a big end failure?

Pete–
68 E-type OTS, 99 Daimler Super V8
Cambridge, United Kingdom
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In reply to a message from PeterCrespin sent Sat 6 Mar 2010:

I have been following this issue for a few years, and I find it
almost hard to believe that there are none available. Granted, I
have never heard of a lower end failure on and AJ16 engine, but
still, parts should be available.–
The original message included these comments:

Try Gregory Wells at Coventry-West. He is the only other person I
know of who has ever looked hard for these shells and AFAIK he drew
a blank too, despite being in the trade. The engines simply don’t


uncle
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A couple years ago I corresponded a few times with a fellow…can’t remember
his name…who was able to put together a full set, one bearing at a time
from several vendors, as I recall. I think he posted here a few times so
maybe he left a archives trail.

Cheers
Doug Dwyer
Longview Washington USA
1995 XJR

In reply to a message from uncle sent Sat 6 Mar 2010:

I agree Doug. Somebody obviously made them once in order for the
engines to be built in the first place, so you’d think if nothing
else Jaguar would have bought a run-on quantity for the spares
stock. I believe it’s not as unusual as you might think with graded
fit bearings and has cropped up with bikes too.

In this case, Jaguar of course began making essentially the same
bottom end around 1984 for the XJ-S and by the time of the X300
they might have had a ten year history of zero or close to zero
shell. In that context it is possibly understandable? Still
unnerving, but less inexplicable…

Pete–
The original message included these comments:

I have been following this issue for a few years, and I find it
almost hard to believe that there are none available. Granted, I
have never heard of a lower end failure on and AJ16 engine, but
still, parts should be available.


68 E-type OTS, 99 Daimler Super V8
Cambridge, United Kingdom
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In reply to a message from PeterCrespin sent Sat 6 Mar 2010:

Slightly OT and I shall probably be shot for heresy . . .

  • but my 1935 Austin Ten will probably outlast most modern
    cars as it has white metal bearings that can be re-poured
    and reamed out to any size needed. . . . . in theory at
    least giving it an infinite life independent of a need to
    find the right parts !

But then it only has to deal with 20bhp, not 200 plus

I shall now exit forum - FAST

Regards from Jim Butterworth
http://www.watchet.dolphins.btinternet.co.uk

I wondered why the ball was getting bigger. Then it hit me
.–
The original message included these comments:

I have been following this issue for a few years, and I find it
almost hard to believe that there are none available. Granted, I
have never heard of a lower end failure on and AJ16 engine, but
still, parts should be available.


Jim Butterworth http://www.jag-lovers.org/v.htm?1262090878
Somerset, United Kingdom
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In reply to a message from PeterCrespin sent Sat 6 Mar 2010:

Hi Pete,

When the shop estimated it would take two months or longer
to go through my high mileage engine I found them a used
engine to rebuild. Only after doing the top end did they
realise new OEM big end bearings were no longer available in
North America.

In hindsight I should have left the 120K miles engine alone,
but now that they’re into it I don’t want to end up with an
expensive paper weight. I suppose as a last resort the
original big end bearings could be reused…but I don’t want
to go there just yet.

Jim Ursulak
97 x300–
The original message included these comments:

Did you actually have a big end failure?


VanJim
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In reply to a message from VanJim sent Sun 7 Mar 2010:

Jim how do the bearings look after 120,000 miles? Any chance of a
picture?–
The original message included these comments:

In hindsight I should have left the 120K miles engine alone,
but now that they’re into it I don’t want to end up with an
expensive paper weight. I suppose as a last resort the
original big end bearings could be reused…but I don’t want


Nick 67E-Type 67S-Type 65S-Type 96VDP 95XJR
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In reply to a message from VanJim sent Sun 7 Mar 2010:

120K is low to medium miles for one of these. I’d expect maybe
valve guide seals or maybe a weep from the front right head gasket
oilway but not much else wrong with the structure. I hope the
shells are still in the rods or caps or you will likely have your
paperweight. If the journals mike up OK, which I’m sure they will,
and the bearing clearance is in spec (which you should measure with
new shells anyway as a check) then you will probably get another
120K out of your shells no problem, although we’d all obviously
rather freshen them up if they were available.

The good news with graded fit parts is you get some fabulous engine
integrity and longevity. The bad news is it becomes a nightmare to
keep stocks of multiple different parts instead of just STD, -
0.10’’, -0.020’’ etc. When you get stocking hassle coinciding with
very low demand, only one thing is going to happen until/unless
demand rises. Even after 15 years I doubt there’s a worldwide
market for a dozen set of shells per annum, if that, and with the
grading system you’d have to stock more than you could sell. Only
guessing, but it wouldn’t surprise me.

Pete–
The original message included these comments:

In hindsight I should have left the 120K miles engine alone,
but now that they’re into it I don’t want to end up with an
expensive paper weight. I suppose as a last resort the


68 E-type OTS, 99 Daimler Super V8
Cambridge, United Kingdom
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In reply to a message from VanJim sent Sun 7 Mar 2010:

Add the bearings, to the list that includes ehaust manifolds, and
corrosion problems on the valve cover, and anyone who is comitted
to an X300 should be in the market for a spare engine. I have seen
these from $350 on up.
Peter is correct in that the AJ16 engine had a short production
life, and has been very reliable. The other side of the blade is
the market for spare parts is not there, neither is the supply.–
The original message included these comments:

When the shop estimated it would take two months or longer
to go through my high mileage engine I found them a used
engine to rebuild. Only after doing the top end did they
realise new OEM big end bearings were no longer available in
North America.


uncle
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In reply to a message from Nick Hand sent Sun 7 Mar 2010:

For those who are interested, I have posted some pics of the
big end bearing shells removed from the 1996 AJ16 now being
rebuilt.

Jim Ursulak
'97 X300–
The original message included these comments:

Jim how do the bearings look after 120,000 miles? Any chance of a
picture?


VanJim
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In reply to a message from VanJim sent Thu 1 Apr 2010:

I would like to see those pictures.–
The original message included these comments:

For those who are interested, I have posted some pics of the
big end bearing shells removed from the 1996 AJ16 now being
rebuilt.


uncle
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In reply to a message from uncle sent Thu 1 Apr 2010:

I just bought a decent engine for �150 to ‘lay down’ in
case I need spares. It was listed for weeks at that price
and never sold even though it’s a 4.0L.

Pete–
68 E-type OTS, 99 Daimler Super V8
Cambridge, United Kingdom
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In reply to a message from VanJim sent Thu 1 Apr 2010:

The photos can be found at:

http://www.jag-lovers.org/v.htm?1270161618

Jim Ursulak
'97 X300–
VanJim
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In reply to a message from VanJim sent Thu 1 Apr 2010:

Thanks for the pictures Jim. They look very good for 120000 miles!–
The original message included these comments:

big end bearing shells removed from the 1996 AJ16 now being
rebuilt.


Nick 67E-Type 67S-Type 65S-Type 96VDP 95XJR
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In reply to a message from VanJim sent Fri 2 Apr 2010:

Hope they didn’t get mixed up if you can’t find new ones,
although even then you might get away with careful
measurement & reassembly…

Pete–
68 E-type OTS, 99 Daimler Super V8
Cambridge, United Kingdom
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In reply to a message from PeterCrespin sent Fri 2 Apr 2010:

Shells look OK to me, just a small amount of marking from
what I can see - if the crank is OK I would probably put
them back after checking for any play in the assembled bearing.

Regards from Jim Butterworth
http://www.watchet.dolphins.btinternet.co.uk/

If it isn’t broken, fix it untll it is–
Jim Butterworth http://www.jag-lovers.org/v.htm?1262090878
Somerset, United Kingdom
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