Oil Pump Adapter

[peter dowdle]

My 441 MK 2 has a badly cracked oil pump adapter which bolts on to the bottom of the oil pump to accept the oil lines that lead to the external oil filter. The factory at this stage has not responded to my request for a replacement. Can any one help?.

[Kevin H]

Hi Peter,

Is it this bit that is broken - see attached image

Either way, these parts should all be available from an Mopar parts supplier - mostly in the US.

[peter dowdle]

Yes thats the one but my mopar man in melboure has never seen one before. Is that one for sale?

[Kevin H]

Peter, this one isn't for sale. I never sell parts from a car that I still own, just in case!



I was going to say you should be able to find one quite easily online, but after an hour of searching it seems this is not the case. However, there are certainly remote filter kits available for those oil pumps.

Suggest you chase up the factory for a response- it may have been made for them.

I don't suppose the one you have can be welded?

[Thor]

Kevin, the part in your picture also looks broken. A part like that could be welded and re-machined, but I suspect the welded version would be weaker than the original.

I offer a service of taking in parts like that, carefully modelling them in 3D CAD and then making them from solid. This is obviously expensive, but a lot easier than finding unobtainable parts. Difficult to estimate from a picture, but probably about £1,200 for a one-off, but if a bunch of big-block 411 owners wanted to order 10, they'd be more like £500 each. Still sounds expensive, but you have to cast and then machine something like that in quantities of several hundreds to get the price below £100.

This just might have been something specially made for Bristol, I don't know.

[peter dowdle]

Thank you both . Mine has been welded once earlier in its life and recently for me. The problem is the thread is tapered and as you tighten the pipe fitting it puts undue pressure on the 50 year old cast iron causing it to crack. One option is to bore the thread out and re tap with a non tapered thread, using an O ring to seal the oil.

I rang the factory and they advised no new stock but may have a second hand one. Still waiting for confirmation.

Elko Performance Parts in Melbourne (chrysler specialists ) know of a kit out of the USA that would have possibly the right adapter, but you have to buy the whole setup just to get the part you need.

The JOYS of bristol ownership.

[peter dowdle]

I have just been advised that Bristol have a second hand one for me

[Kevin H]

Originally Posted by peter dowdle

I have just been advised that Bristol have a second hand one for me

That's good news Peter!
It seems it is a surprisingly rare part.

[Kevin H]

Hi Thor :-)
It's been a while!

On mine it is the pump body that is cracked, but I think Peter's problem is with the adapter plate (see picture).

If originality was not a concern it is easy top buy a replacement (higher performance) pump, plus a remote filter kit for considerably less than £500.

[peter dowdle]

Kevin yes its my adapter plate that is broken where the oil line fitting screws into the cast housing as seen on the left of your photo.

Yes you can buy replacement pumps either standard , high volume or high pressure but your comment on buying a remote oil filter is also correct but you still need the item I have been chasing.

Some of the high pressure or hi volume pumps are longer in the body . There is very little clearance between the pump with adapter attached and the cross member. Approach with care.

To fit any replacement pump you have to either remove the motor or as I did support the motor with a trolley jack and remove the 2 engine mount bolts and with care jack the motor up high enough to enable the oil pump retaining bolts to be removed

[Kevin H]

Good point Peter about the clearance!

I have a Melling M63HV pump on my car now and I suspect the oil pump cover has been removed and replaced with something like the item shown in the attached image - it's a Milodon Billet Aluminum Oil Pump Cover - 21225. They can be bought from several sources in the US for about US$220.

This would solve the problem. The intake on the right hand side would be capped and the two ports on the left hand side go to the remote filter.


Regards,
Kevin

[peter dowdle]

Kevin

Seem exactly what I was chasing . Is it fitted to your car in place of the bristol adapter? Why my chrysler contact didnt know of it ? How did you get onto this setup ?

Do you have the third inlet blocked off?

Peter

[Kevin H]

Peter,
I don't know exactly what the oil pump cover is on my car - it was sourced by the guy who rebuilt the engine. He was/is an expert on the Chrysler B/RB engines and sourced most parts from the US. I just know it's a Melling M-63HV pump, although that's very similar to a standard pump.

My pump cover has two front facing ports like the Milodon cover, but I don't know if it has another inlet at the rear. The car isn't very accessible at the moment - I will check when I can.

I'm fairly certain that the third port is for use with a dry sump set up.

I have since found a discussion thread on a Mopar forum where they discuss this;
https://board.moparts.org/ubbthreads...2660464/1.html

Here are the two relevant posts;

Thread title: Remote oil filter adapter for BB pump

Question:
"I am using the internal oil pickup. I only need to have the fittings on the pump for the remote filter. These pump covers that include both the remote filter fittings, and the external oil pickup lines, can I just plug the pickup line holes?
Will they then work with the internal oil pickup passages (stock/hemi)?
For example, the Milidon-21225"

Answer:
"There shouldn't be any issues if you wanted to plug off the external pickup line and just use your existing internal setup, as long as you use the same pump. Some of the race pumps don't have holes drilled for internal pickup."

However, if Bristol has an original one presumably that's cheaper that buying the Milodon product?

Although the Milodon one is probably less likely to fail than the original one.

[Thor]

That Milodon unit looks really fine.

[Kevin H]

Peter,
I have had a closer look at what oil pump cover is on my car (it's very hard to see!), but I have taken a picture from the front.

It's not a Milodon. It looks more link the original cast steel pump cover, but it's different to yours, and different to what used to be on my 411 - the lower port is at a different angle. So it just has the pressure relief spring retainer on the rear (no third port). I can't tell whether it is a one-piece pump cover, or two piece .


Regards,
Kevin

[peter dowdle]

Kevin just a guess its probably off a jensen intercepter they have one pipe pointing towards the radiator and as I understand the other coming off at an angle.

They are as scarce as hens teeth.

[Kevin H]

Originally Posted by peter dowdle

Kevin just a guess its probably off a jensen intercepter they have one pipe pointing towards the radiator and as I understand the other coming off at an angle.

I think you are right Peter. I started a thread about this on the Moparts forum and someone posted a picture of the Jensen pump cover - I'm sure that's what is on my car. My engine was rebuilt by Dean Anthony at Jensen Motors Australia (not someone I would recommend dealing with).


However, I don't think this pump cover is any use for the Bristol 411 in normal circumstances. He cut a six inch square hole in each side of the engine bay, supposedly to improve access to spark plugs or engine mounts (I forget the exact excuse), but I think Jensen oil pump cover could not have been used if the hole was not there.

They are as scarce as hens teeth.

But not as scarce as the part used by Bristol it seems!


It would be interesting to know whether Bristol had these made up or if they were supplied by Chrysler. If the latter, someone on the Moparts forum suggested it may be from a marine or truck engine, which Chrysler also made.

[peter dowdle]

Im hearing all sorts of stories about Jensen Motors Aust. Odd story about the holes spark plugs are no where near the the area he would run oil lines. The only spark plug that is a bit hard to reach is next to the power steering box.
So farm I am finding ELKO PERFORMANCE very good to deal with. Motor and gear box are already to refit just waiting on pump adapter to arrive from UK.
We have fitted a new cam,lifters, twin chain timing chain and new gaskets through most of the motor.