Any place still have them? JLM1113801 JLM1113802 JLM1113803 three different grades/colors.

 

DAMIFINO

 

It looks like the big end bearings are backwards compatible with the 5.3, and 5.3 bearing sets are available from Jaguar, part JS571. It's worth checking if the nominal diameters are the same between the 5.3 and 6.0.

 

The 6 liter came with different 3 different bearing sizes that from smallest to biggest is .0011". And I'm not sure if all my rod journals are the same or not. I can explain bearing grades for you and post a PDF if you want.

 

Have you tried calling any shops that do racing engines and FULL rebuilds/etc? Rob beere or team cj come to mind

 

What’s wrong with the ones you have? A lot of bearings are still in good shape with really high miles on them.
I found that out the hard way. I’d buy new bearings for a race motor and it would have lower oil pressure than before I replaced the bearings.
Jaguar was very big into batch building engines. They would sort out slightly undersized rod journals with slightly oversized bearings.

 

Looks like only standard is available from Jaguar for the 5.3. I have the 6.0 engine manual for the XJS and it is essentially the same as the 5.3, it says that things are the same, except for rod length, pistons, lower tension rings and combustion chamber size. Interestingly, a clearance for the rod bearing is not specified.

So as long as you have standard crank journals, you should be ok with 5.3 bearings. Are you 100% sure they need to be replaced? Jaguar says that if the crank is damaged it need to be replaced, regrinding the journals is not an option.

 

Yes I have a light rod knock from 1a.

 

Update! Rob Beere phones are down. Called team cj and they certainly won't have 6 liter stuff. They referred me to another shop called torque performance nearby them and they took down my needs and will be reaching out to me soon. At this rate more than likely will have to turn all my journals down to use 5.3 bearings. Almost not worth it.

 

Rod knock doesn’t mean new mains are called for. If the rod is indeed worn what size are the journals? Do you have access to a 2-3” micrometer?
Lacking that try plasticgage.(TM) Basically that’s a thin piece of plastic you put on a clean dry bearing. tighten and properly torque The cap. Then remove the cap and using the width gauge they provide determine how much clearance you’re working with.
it should be between .007-.013
Do Not attempt to have your crank ground undersized. If the rod journal is scared, scotched, or otherwise damaged, your best solution is a replacement crankshaft. Darn few crank grinders can properly grind Hardened crankshafts undersized then reharden the crank back to original.

If you are looking for one set of rod bearings, try Rock auto. Those guys surprise me a lot not only on getting parts but how much less expensive they are for the same part number.

 

I can't even comprehend what you said in the first sentence. But I have a bad rod bearing. Very apparent metal shavings in oil.

 

Update! Hopeless!

 

Did you harass every shop in the UK? Theres a few, and one or two guys who specialize in parting out xjs cars specifically.

 

I'd rather get bearings and not a entire motor. Rob Beere doesn't answer their phones during business hours so I left an email.

 

Graded 6 liter bearings are officially no longer available anywhere. How sad. Also slightly angering. Only option is grinding the crank and using 10 under 5.3 bearings.

 

Ivan
I have a vague idea that the XJS V12 crank has been nitrided and that grinding it ruins the hardening. Just mentioning it in case you do opt for this plan, as it would be worth checking if true or not.

 

Change of plans actually! Gonna wing it and toss in 5.3 bearings. I actually have a xj12 but I come here for engine problems. Mine is a 96 so it has a different crank from earlier 6 liters being it is cast.

 

Not to pick bits but Jaguar didn’t cast cranks when Ford bought them.The first batch of 6.0 cranks were Forged. The second batch are sintered Iron. That’s a pretty decent crank and easily capable of dealing with Jaguar power. Just not quite as good as the forged EN 40 cranks that are then hardened. But as long as you keep it under 7000 rpm and change the oil based on time rather than mileage you should be good to go.

 

How do you know? No one has broken a cast crank before. Let alone a forged.

 

It will be cheaper to source a used engine than to properly rebuild a V12. They are quite expensive to rebuild. However, you should take your engine apart and see what you need after measuring, as at the moment you don't actually know what is the source of metal shavings in your oil do you?