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3 cyl perkins very low oil pressure, desperate

W

windmillgeorge

New User
I rebuilt my massey 35 3cyl perkins. Full kit. crank turned, undersize bearings. Plastiguaged right on the tight side of the tollerances.
Now have tried two new oil pumps.
Relief valve checked and I slightly stretched the spring. No difference.

I get 5 psi at idle and 10 at 1500 rpm. Before the rebuild, I had 40 at idle and 60 at 1500 rpm.

Both sump oil lines pressure tested. Compression fittings on each end of each pipe is perfect. Really tight.

Screen is clean, was clean before rebuild.

My only hint of a possiblility is when I remove the oil filtre mount, and blow in the top port, air comes out of all the main bearings, but in my opinion, too freely. Examined the inside of
the block very well and no visible problems.

I have been 3 weeks without a tractor that I farm with every day. I am really desperate. I cultivate daily and cannot borrow any local tractors as their wheels will not adjust to the row
spacings that I need.

Please please help, george
 

That is dreadful George , are you sure you can trust the gauge ?
Try cleaning out the feed tube with some fine bicycle cable and air .
 
Thanks charles, I blew through both of them and they seemed perfectly clear.

The calipers could be wrong I suppose, but the plastiguage is always right on I believe, I don't think it can be wrong, but I stand to be corrected. The bearings seem to fit perfectly as well.

I went to the premiere of Polyfaces, last night, you aussies should be proud of the couple who did the documentary, beautiful.
Thanks george
 
if I remember correctly someplace on the motor is an expansion or pipe plug that can be over looked quite easy could be leaking or missing and is only 1/4 to 3/8 used as an access point to drill out an oil gallery
I sort of remember reading about it on these forums a while back
sorry I don't remember more details but hope some one that does will see this and trigger their memories
 
Make sure the oil pump pickup isn't restricted, how about the line going from the oil pump to the block are seals good?.
Are the 2 metal lines outside of the block by the starter clear (not restricted).
What oil filter are you using? The old canister type, or the spin-on? If it is the canister style are all the internal seals, and springs in it (are they in the proper positions)? For the canister style there is 3 different filter housings,
What is the engine serial number (engine serial number will be like 1842318, it will be either above that number, or below it).
 


Most of us feel your pain, George!

Might be a long shot, but the valve rocker arm shaft is adjusted manually to increase or decrease oil flow to the rocker arms. As I recall, most of mine had the screwdriver slots on the front of the shaft just slightly off vertical. It might be adjustable far enough to cause that low pressure, but the external feed lines Feeding the camshaft (and then on up to the cyl head) are so small (1/16"?) that it's hard to think that would allow enough oil through to cause that pressure loss.

The oil galley plugs mentioned below (7/16" cups) would be more likely candidates. But if it was the rear one, it opens onto the flywheel and you'd sure have seen that! The front one opens into the front cover and gear area, and would drain back into the oil pan. I can't remember whether or not it's covered by the back cast aluminum plate.

That galley is located in the left side of the engine block an inch or so in from the side, at the level of the oil pressure gauge connection on the block. All you see is a blinded 7/16 hole on the front and rear faces of the block.
 

George, I also feel your pain. Why was the engine overhauled? My Perkins was smoking and blowing oil. A week after overhaul I found diesel in my oil after noting a significant drop in oil pressure. The viscosity of the oil was thinned by the diesel. Turns out the injector pump seal had failed. Is the oil the correct viscosity and bubble free? I believe my injector pump failure may have contributed to the cause of my overhaul. Good luck in sorting it out.
 
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