DynaBro
Well-Known Member
It has 2 o rings. But if you split the pump like I have the job requires 2. The inner one and the shaft.
Oil pump questions
- Thread starter DynaBro
- Start date
Yes, but that kit should have 2 of the large diameter o-rings. The skinny one services a Milodon pump and the thicker one is for a stock pump. For a guy like me that runs Milodon pumps also this is a good part to have.
DynaBro
Well-Known Member
I’m going to post photos of the pump in a couple hours. Glad to have you guys here. All I wanted to do was fix a leak not get a migraine!
The Milodon oil pump has a larger rotor diameter. This leaves less room for a o-ring, so it uses a skinnier o-ring than a stock Melling pump.
Everything is going to be fine. Just stay calm and don't get in a hurry. This is just a learning process to go through. It won't be expensive nor complicated. All the problems you are having is from lack of knowledge. If you knew it all you can't believe how easy this really is. Just be glad you have the internet. Nothing is as hard as it used to be.
DynaBro
Well-Known Member
I get it. I just want to be turning a wrench right now not running down numbers on the internet and spending 2x what I have to on gasket kits and assorted junk. I just discovered one of the levers/arms to the trans is loose from a cotter pin falling out!
This video shows rebuilding an oil pump but unfortunately not the reassembly. Maybe I should do a video of reassembly.
DynaBro
Well-Known Member
Is that a Larson Systems spring tester? I had a hand in getting you that machine.
You might have that piston in upside down. The cap would be very hard to get on if you get it backwards. I thought I got that spring tester in Michigan. But I really don't remember.
DynaBro
Well-Known Member
Yeah nothing in the manual about that.
DynaBro
Well-Known Member
The relief valve piston the springs seats in is installed with the opening they looks like a mouth at the bottom. Furthest from the screw cap.
DO NOT coat this gasket with excess RTV . This issue caused major issue for me......Lucky I caught it before the engine got damaged. That pick up hole goes down to 1/4 inch when assembled
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I think this is correct. The spring drops into the piston, and then plug screws in to seal it. The other end of the plug seals off a pump orifice until oil pressure overcomes spring pressure.
DynaBro
Well-Known Member
The issue is what O ring goes where. Between the two pump halves I have two option, skinny or fat.
I think they only look right one way. If you put the fat one on the shaft it probably won't go in the block. Put the skinny one on the shaft and then try to put the pump in the block. That will make it obvious to you.
DynaBro
Well-Known Member
Not on the shaft, the larger diameter o ring in between the two plates. In fact there are two inner O rings, a small and a large diameter. My thinking here is it doesn't matter. It's getting smashed anyway so go with the thicker one. The one on the shaft does matter. And I'm pretty certain it's the thinner option because like you said it looks right.
DynaBro
Well-Known Member
Right. The Seal Rings are the issue. It came with two of the large diameter ones. A thick and a thin.
You already know the large one goes between the plates. The skinny one goes between the plates of a Milodon.
DynaBro
Well-Known Member
Let me try this again.
The kit included TWO large diameter Seal Rings (in addition to the small diameter O Ring and Seal Ring). As shows in Delta V's pic above. The two options are of different thicknesses. The job only requires one of these large diameter Seal Rings, it goes between the pump plates.
The LARGE diameter Seal Ring is the issue. Although the kit says which to use whether you have a stock or aftermarket pump I do not know if my pump is stock. I am just going to smash the thicker one in because why not.
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