Engine Oil

[NigelW]

Yes, capillary feed. Spools up just as quick as an electrical guage. I'll just add the engine has a high output racing pump fitted and oil pressure runs at about 50lbs hot.

[John Quilter]

Isn't the pump for the 4.2 engine as fitted to Series III cars of higher output than the 3.8 pump? I believe that the 4.2 pump is the only replacement now available for the 3.8 but there are some pickup tube modifications that have to be made to install it. Can anyone confirm?

[cass3958]

Xj6 series 3 oil pump is part number C21765 HE 6016 this is the same part number for the S Type 3.8 and 3.4 oil pump.
3.8 and 3.4 Mk2 oil pump is C17655 HE 4707 on the later chassis numbers. On early cars it was part number C8612/1. HE 1359

When I was rebuilding my engine some one suggested putting the better oil pump from the XJ6 in to the sump but when I looked up the part numbers they were one and the same so did not bother. Up grading to this pump if you have a Mk2 is possibly advisable but no need in the S Type.

[NigelW]

That's correct regarding the feed pipes, the 4.2 pump has larger diameter items. When I fitted the modified XJ pump on my car that was supplied by Rob Beere Racing http://www.rob-beere-racing.co.uk/ I had to source XJ pipes as Beere didn't supply any back then. I don't know about the pump Rob mentioned fitted to S Types but the pump I pulled out of my engine originally had the smaller diameter pipes.

[cass3958]

If you put the part number C21765 in to the SNG Barrett website it comes up with the following.

https://www.sngbarratt.com/English/#/UK ... 0C21765%60

If you look at the 34 models this pump fits it includes the S Type 3.8 and 3.4 along with the XJ6 series 1 to 3. Don't see how the pipes are going to be a different diameter.
So I went back to the parts list.
Oil suction pipe from oil pump to sump is part number C21762 and is the same on both the XJ6 and S type. SNG Barrett stock this for the S Type and XJ6.
Oil delivery pipe from pump to engine block on the S Type is C21846 but there is a different part number for the XJ6 which is C22595. SNG have C22595 for the XJ6 but do not have C21846 for the S Type. I am assuming having two part numbers is possibly more to with the shape of the pipe fitting between the pipe and engine block than the diameter of the pipe but I might be mistaken.

C21846 for the 3.8 and 3.4 S Type has a fitting to the block with just two bolt holes. https://www.ebay.co.uk/itm/Jaguar-Oil-P ... 3779205178

Oil Pipe C21846.jpg (59.37 KiB) Viewed 971 times

Where as C22595 for the 4.2 XJ6 has a three bolt fitting to the block. https://www.sngbarratt.com/English/#/UK ... 0C22595%60

Oil pipe C22595.png (41.14 KiB) Viewed 971 times

[NigelW]

It was a long time back when I did the job but I remember the new pipe I had to source was the pump to block plus brackets. My car might be different to to later cars as it was one of the first 500 built and designs might have changed.

[cass3958]

This is a photo I took of my Engine 8 years ago when I stripped it down before the rebuild. You can clearly see the two bolt hole fitting at the bottom of the picture where the pipe fits the block. The engine is a 7B block from a 1967 3.4 S Type.

DSCF6994.jpg (3.32 MiB) Viewed 966 times

Hard to see how the XJ6 pipe with the three bolt fitting could fit the S type block but as you say Nigel Jaguar changed so much in the early years and in 1966 that anything could go. You pulled your engine quite recently did you not take photos of the stripdown?

[NigelW]

I've been back through the photos i have of the engine build and unfortunately I didn't take many, probably due to pre digital camera era as it was 1998 - I did say it was a while back and haven't got any shots of the crank etc. You are right about the block and pipe and the number of bolts, it definitely had two bolts. The only thing I can think of with regard to fitting larger bore pipes is that my block was built to Mk2 spec but it was the original engine (matching numbers) confirmed with heritage certificate but definitely had to fit biger diameter pipes.

[cass3958]

Looking at the parts list for the Mk2 and it is the same pipe as the S Type C21846 so a two bolt pattern not the three and the same pipe diameter. In your post Nigel you said the Beere sold you a modified XJ oil pump. Do you know or remember how it was modified?

[NigelW]

I can't remember the exact details but he said it had been machined to much finer tolerances than a standard pump, one thing I can remember is it cost three time the price of a standard pump. They were the go to pumps of the day for the Jaguar club racers along with the oil cooler and the modified filter block as seen in the photo.