THE INTERNATIONAL JAGUAR 'S'-TYPE REGISTER FORUM

Rob, i don't think anything untoward was involved in the purchase of the pump as I didn't buy any pipes from them, I found some in the piles of Jag parts I used to have back in then as I had a few engines in bits - various Xj6, Mk2 and S Type. My memory is hopeless regarding the parts used at the time to build the S Type engine. I still have a 1959 3.4 Mk2 engine in the shed that I bought for £40 in boxes and fitted to the S Type in 1979 and used the head from the original 3.8 untill I could get around to rebuilding the 3.8 and used parts from both engine blocks to make one engine that worked at the time. For example the alloy sump replaced the tin sump of the 3.4 so the pipes could have got mixed up along the way and putting the 3.8 back to geather again with correct block, head sump etc. So this is maybe the reason I had to get replacement pipes to fit the 3.8 oil pump. It was a mad time back in the 70's for me as I had five lockups full of cars and parts and suddenly I was evicted from them when the Department of Transport decided to build a new road through them and my house, imagine trying to find a home for that lot?

It's why you could thrash a 4 cylinder little twin cam Alfa flat out all day every day once warmed up & clearances normalised. It had a close to ten litre baffled, multipiece, aluminium wide spread finned sump that exposed itself to airflow under the car. No further oil cooler required. Large diameter suction intake to the pump. It was one car that you could genuinely drive as fast as it would go all day with no ill effects while many US/continental cars of the era would break if you tried that.


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Baffles continue up into the main sump body.

I am not doubting what you say Nigel but I think Beere might have pulled a fast one on you in changing the pipes. Even if the pipes were a larger diameter where the two bolt flange attaches to the block unless the block had also been machined to accept the larger diameter pipe I don't see how it would fit. I can't see the requirement for a larger diameter pipe from the pump to the block.

If it was the pickup pipe you replaced I can see that. A larger pipe on that side would allow a higher volume of oil to be picked up by the higher powered pump. The pump would then squeeze the oil through the standard sized pipe to the block and on to the parts it needs to get to at a higher PSI. That would mean your oil pressure would be higher but you might then need a bigger sump to carry the greater volume of oil required for the pump to suck up or it would run dry very quickly. Your oil pressure would then drop like a stone and the engine would be toast. Problem is the XJ6 and S Type part number for the sump to pump pipe is the same so therefor the same diameter.

On my Lotus Seven I had a larger sump fitted that had wings sticking out the side (could not go down due to ground clearance) to increase the amount of oil it could hold. My Ford Anglia has a dry sump but a massive catch tank to keep the volume of oil high.

3.8's Typically had 2 bolt oil pipe flange.


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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.

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?

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.

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.

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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?

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.

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/parts/51f2ec42-867d-4d92-98ef-42d3e319953f?fromList=Search%20for%20%60C21765%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-Pump-with-Pipe-fits-3-4-3-8-Jaguars-/153779205178

[attachment=1]Oil Pipe C21846.jpg[/attachment]

Where as C22595 for the 4.2 XJ6 has a three bolt fitting to the block. https://www.sngbarratt.com/English/#/UK/parts/87d310de-b4aa-4f63-b753-16961c890af9?fromList=Search%20for%20%60C22595%60

[attachment=0]Oil pipe C22595.png[/attachment]