I’m starting to replace my 4.2 engine. Having replaced all of the oil seals. In the hope that can park the car on friends driveways.
i was replacing the cone on the front in preparation when I noticed a machined area on its back end. Its Kind of strange for it to be there with no apparently use.
my jag Manual shows the recess on the cone but no O Ring. Moss on the other hand shows an O Ring, presumably on the cone between it and the spacer. There was no O ring there when I dismantled it.
Could somebody confirm this O Ring is required.
One other question.
Why does the spacer have a keyway. I admit it slips over the woodruff key nicely but then slips past it when inserted into the seal. Or Am I missing something here.

 

What year? Does yours have the Teflon seal or the spring lip seal? Early 4.2 had the lip seal, later had Teflon, and the details vary.

-Dave

 

No Teflon seals noted on the disassemble

 

https://mossmotors.com/xke-7744-inte...ine-6-cylinder

If you have item #17 " slinger" then you have original configuration and need #15 seal. New Teflon seal set up removes the slinger.
Moss Note on newer Teflon seal upgrade kit: Note:Jaguar recommends fitment of C40147 spacer and EAC8101 O-ring when updating to the Teflon seal. We feel this is not absolutely necessary. However, the oil slinger must be removed as this seal must be kept wet.
"" from memory the seal goes into a grove in the inside of the spacer""" investigate as I don't have confidence that this is what I did before, did upgrade to Teflon and put in full kit.. Check this out as a worthwhile addition to you engine for future tuning the engine over with just a ratchet wrench. https://mossmotors.com/37-2020-crank...-washer-by-arp

Rgds
David

 

I have decided to add the O Ring, as I can’t see that changing much, as I have purchased a replacement seal ( none Teflon).
so I will leave in the slinger and not rely on the Teflon seal to stop the oil drip. On a 50 plus year old car the surfaces may not be 100% and hope that the slinger and a new seal works better.
i fitted a home made oil drip pan under this area last year after complaints from my wife due to oil drips on the driveway

 

Where are you putting the o-ring?

I just replaced the front main seal on my 1965 4.2 FHC. It had the conventional seal, and I stuck with that. Kept the slinger (Oil thrower). No O-Ring

The conventional seal rides on part #C2173 (Source is parts catalog), and this doesn't have a groove for an O-Ring.

Moss shows the Teflon seal rides on part # C4107, which has an internal groove for an O-Ring

https://mossmotors.com/c40147-crankshaft-spacer-front

Hope this makes sense!

Cheers, Dave

 

Yes, this makes complete sense.
Originally I was thinking the O Ring went in the open groove at the back of the cone. Though I had no idea why or what it would do
i was getting somewhat confused as my spacer has no O Ring groove, is a very close tolerance fit on thee shaft and fidgety to get on.
i have been contemplating purchasing the C40147 spacer, as my engine is out presently. The O Ring makes a lot of sense to me.
while the close tolerance fit is nice, I don’t think it would completely stop oil seeping out.
Im just not sure how long the O Ring will hold up.
do you have any idea if the spacer rotates with the crank shaft or is it held by the seal

 

The spacer rotates with the crankshaft. The O-Ring seals the gap between the spacer and the crankshaft. Although everything rotates, they're rotating at the same rate, so the O-ring isn't sealing moving parts.

The front main seal is stationary and the seal lip rides on the spacer.

I just put mine back together at the weekend and have been on a short test drive. No leaks so far!

HTH, Dave