My Oil pump (crankshaft front) oil seal failure Update.

As the other thread is getting full and a bit off topic i thought i would add some revelations here,

first off i got a call from the people who are replacing my oil pump, as i asked them to let me know when they had the sump off, so i could weld on a bung for a thermocouple, so when i took it back this evening i had a look at my bottom end, checked the crankshaft end float, and found it well within spec,

but had a look at the oil pump drain size, (the pump is still on the car) and found that it has already been opened out:( which means that the oil seal was being overwhelmed even though the drain was of an over adequate size! (supposedly!)

So i hope that the pump rotors are extremely worn, otherwise its back to the draw ring board, or even worse, start to consider that it may be down down to crankcase pressure after all:blink:

Skyline pumps are very similar, but my Tomei one has at least 3 times the drain back area. I will find a stock Skyline pump and check that. The Tomei one is very different to stock. I believe I can mod a Supra pump to have a LOT more drain back area, but it would tax my milling skills to the extreme, I may have to contact someone more competent

Please post when you have the back off the "leaky" pump!!!

The trouble with the Supra pump is that there is very little meat on the casting under the seal housing, i looked into the possibility of adding an extra drain, and the std one cannot be opened up to more than 5.5 mm 6mm would be pushing it:( i will try and pick up the old pump tomorrow as i really want to find a reason for all this aggravation.

Holes do not HAVE to be round...

LOL very true, pig of a job though, good luck.

Link to update on this, http://www.mkivsupra.net/vbb/showthread.php?t=108524&page=21

Some better pics of my pump.

http://www.imagestation.com/picture/sraid225/pb74991c1c91a6dab43c7a5ceaad5a5ae/e91f9fd7.jpg

http://www.imagestation.com/picture/sraid225/pc4d4d112d40ae437d063ff36f21c64cb/e91f9fda.jpg

http://www.imagestation.com/picture/sraid225/p01eefd4285dcbc7adabb4ccf83adf820/e91f9fdd.jpg

http://www.imagestation.com/picture/sraid225/p12427d9c9ab2bcf222217bbd39f6341b/e91f9fd8.jpg

http://www.imagestation.com/picture/sraid225/pd61a25f77abea01d0c719f2bba3fca4c/e91f9d8f.jpg

Which bit on there is this mysterious drain hole thingy you talk of expanding?

-Ian

Which bit on there is this mysterious drain hole thingy you talk of expanding?

 

-Ian

You cant really see it in those pics, but if you look at the large pic of the back of the oil seal area the drain is in the dark part between the seal and the scored bearing surface.

Ooooooh at last. Is is a slot or a groove leading to a hole?

It's a hole leading in to the peripherary of the oil seal bore, just inboard of the seal, and as such the hole is elliptical.

It's a hole leading in to the peripherary of the oil seal bore, just inboard of the seal, and as such the hole is elliptical.

Yep, definitely gonna need a picture after that description

-Ian

I'll attempt an answer to this problem tomorrow, tired and deflated after a hard weekend and Monday