Oil leak at fuel pump

andrew honychurch · #1 05-08-12, 23:24

To be clear I thought I would just summarise the issue

1. My set up appear to have the oil pressure and relief valve on the other elbow to the book and David Gordons. This is odd as I assume only one of these elbows flows pumped oil out, the other is a return.

2. Which elbow flow oil out?

3. Did the arrangement of these oil pick ups change for some reason?

4. If mine is taking oil from the wrong elbow it will be sending it back in against the oil trying to flow out?

5. If I have followed the schematic when I hooked up the cooler lines, I may well have got the oil flowing into the wrong union on the cooler. Could this be affecting my flow rate through the cooler, and causing the relief valve to operate and dump oil onto the fuel pump?

Hope thats all clear thanks A

rob love · #2 06-08-12, 02:03

Quote:

Originally Posted by andrew honychurch

To be clear I thought I would just summarise the issue

1. My set up appear to have the oil pressure and relief valve on the other elbow to the book and David Gordons. This is odd as I assume only one of these elbows flows pumped oil out, the other is a return.

2. Which elbow flow oil out?

3. Did the arrangement of these oil pick ups change for some reason?

4. If mine is taking oil from the wrong elbow it will be sending it back in against the oil trying to flow out?

5. If I have followed the schematic when I hooked up the cooler lines, I may well have got the oil flowing into the wrong union on the cooler. Could this be affecting my flow rate through the cooler, and causing the relief valve to operate and dump oil onto the fuel pump?

Hope thats all clear thanks A

Oil runs from the low one to the high one. It would seem the engine's oil relief is after the high one. Quickest thing you could do now is to put in an appropriate Tee fitting and hook a mechanical oil pressure gauge at the high one. If pressure at that point is 80, then your problem is going to be in the engine relief. If the pressure is significantly lower than 80, then you have a blockage or restriction in your cooler system.

Lynn Eades · #3 06-08-12, 04:18

From some U.C. books.

Lynn Eades · #4 06-08-12, 04:23

Of couse your system will be slightly different, so move with care.
Tony Smith is right, photos are better than me telling you.

The info regarding adjusting the valve is referring to ports marked the same as Michaels picture of the valve.

David that "breather' you have arrowed is the grease cup for the thrust bearing.

horsa · #5 06-08-12, 07:16

Thanks Lynn, something new for me to research as I have a hex bolt there for some reason. I probably filled the hole during restoration and promptly forgot about it....

Per Lynn's post below....I do remember fitting a sealed bearing so might have eliminated the grease fitting at that time. Thanks

Lynn Eades · #6 06-08-12, 09:12

There were two types of thrust bearings used, but a modern sealed bearing is probably the best. Then we are not inclined to over grease it, and end up with a stuffed clutch because it has grease in it.

ajmac · #7 06-08-12, 09:22

Great info there chaps, so if Andrews PRV is set at 10psi like the manual suggests, but isn't being used to regulate hot and cooled oil mixing as the original design intended, rather just dumping oil over 10psi back to the sump via the filler then there is a problem.

andrew honychurch · #8 06-08-12, 09:56

Fantastic, what a great wealth of knowledge there is out there. Its as good as having you all here inthe workshop with me, but without out me having to crack the tinnies!

No seriously , thanks a lot all of you, there are some really interesting points here.

I have to assume, maybe wrongly, that what I have is how it is meant to be on my vehicle. I cannot id the oil pump fitted to mine, as I have not an indpeth knowledge of what the other types look like, but as my vehicle is June 1944 and has the thermostatically controlled valves in the oil coolers , it seems that there may have been a change to the way the system is plumbed.

At present , my best guess is that I have the correct set up but a blocked or restricted cooler. Remember, that during my first tests and run to War and Peace the cooler was getting hot, i.e working. Now it is not. I reckon therefore that the restricition is opening the relief valve and that is whay we are seeing too much oil being fed back through the filler neck.

Much as I didnt want to do it, as its a pain in the arse job, it seems I will need to pull the cooler off and clean it once more with solvent to try to get it flowing ..

Given the low pressures on these engines, its seems logical that it would not need much of a restriction in the cooler or lines to cause the PCV to operate?

David, on the oil greaser, did you have a flexible pipe inside leading from this to the thrust bearing? If not, dont fit the greaser or it will dump into the bellhousing!!

I hope to report back later chaps, many thanks Andrew