Ok guys, I have my 94 6.0 down to the bottom. I really feel it needs bearings. The upper shells all look great, crank looks great, yet the lower shells all have dark gray where the bearing shell has worn. I called one supplier today, and they said they couldn't help. I have all the grades off of the crank. Any suggestions?

 

I'd start here........


http://www.jaguarclassicparts.com/uk/jaguar-xjs-v179737-v226645-parts/engine/crankshaft-and-pulley/crankshaft-6-0-litre

Get all the correct jaguar part numbers and go from there. Google and local Jag specialists and dealers. Ebay. Etc.

Hope that helps.

 

Thanks! I guess the thought of buying a "set" from "a" supplier is out of the question. I will give this a shot.

 

super i used a new set of Vandervell steel backed aluminum bearings, standard size, both rods and mains, a light micro-polish on the crank(set in a lathe,very slow turn).
been 20 odd yrs still carries excellant oil pressure, hot or cold.

i'm not sure if they are still available, but it seems that KING engine bearing, are the hot setup, at least lately.
they are a steel backed aluminum bearing specialist today, bought the license and patent rights from GM/Moraine, very much used by factory backed Corvette race cars.

 

Not sure about using standard bearings from a 5.3 on a 6.0. May work. I did the search, and came up with the rear bearing, the center bearing, and two of the other 5 mains. 0 on the rod bearings. Appear to be NLA. This could be bad

 

Hi guys, back on line finally. 6.0l bearings are NLA, the difference is the 6.0l bearings are tighter toleranced. You can use 5.3 bearings in 6.0l, the journals are the same.

 

Are you sure about that? 6 liter journals literally specced as much as a .0011" difference. That's even too much for me and my standards are stoopingly low! But maybe that PDF was overstating the possible variances which is very possible. https://www.google.com/url?sa=t&sour...sVOCuqQUdWh6xx

 

The clearance on the old 4.2 is specified as 0.0015-0.0033", so that's well within the range of the 6.0 graded bearings.

 

I don't know much about motors. But my knee jerk reaction to those tolerances is fear. I game with cheap bushings and body parts. But I approach engine internals with aerospace quality standards that I learned from Boeing and when I worked at a machine shop.

 

What's a 4.2?

 

The classic XK engine, used from 1948 to 1992. Powered everything from the Le Mans winning race cars, to the E Type, 3 generations of the XJ6 to limousines and tanks for the British Army.

 

Chances are more than good the bearings are fine. The reason for the discoloration on the bottom of the bearings is the engine probably sat for a very long time and the dissimilar metals plus acid from unchanged oil caused a superficial reaction. If you don’t have micrometers or access to them
Spend 10 minutes plastic gauging them. To find out if you really need new bearings.

Clearance should be between .007 & .013.
it sells on line for $11.87 a package. Or you can buy enough to check several engines for about $30.00

 

I have to say seven to thirteen thousands seems like a crap ton of clearence.

 

From the XJ12 Series II manual, the big end rod bearing clearance is specified as 0.0015 to 0.0034" and the side clearance is 0.007 to 0.013".

 

Oh! Side clearences!

 

You are correct, I should have read my notes more carefully. I apologize

 

This is out of my league BUT...could you not coat the parts with several layers of ceramic type coating. They coat cylinder heads why not this? Enough to make up the difference. There are shops in California that do this for race engines.

 

All I know is I found a company who has all three grades in stock. https://handlerparts.de/en/Search?code=Jlm1113803

 

Good for you Ivan. There are bits out there, just a matter of tracking them down... if they actually have them? "on order" is a bit ominous?

 

Pretty sure the page was auto translated from German to English for some reason. Calling the Monday morning. They are nein hours ahead of me.