P80 P2 Coolant pipe o-ring & install 976045 Topic is solved

[abscate]

How about this : Using a hacksaw, cut a couple of small ( 2 - 4 mm ) notches in the leading edge of the pipe.Then carefully peen the edge over till those saw kerfs are closed up. This should give the end of the pipe a pretty good taper. I can of course check it with the o-ring. Sand, buff, grease and slide the pipe in. The only possible drawback is that the pipe diameter is now slightly smaller where it enters the water pump, but I don't think it could really affect flow at that point in the system.

Pictures from water pump side , with pump removed.

[FireFox31]

Pictures from water pump side , with pump removed.

Nice pictures. Where is the o-ring? Sveedy, do you have a picture of the back of the coolant pump with the coolant pipe removed? From your description, I can't picture how it works.

[Sveedy]

Pictures from water pump side , with pump removed.

Nice pictures. Where is the o-ring? Sveedy, do you have a picture of the back of the coolant pump with the coolant pipe removed? From your description, I can't picture how it works.

I thought I had a pic of it but I guess I don't. The o-ring sits back in that opening in a recess. Really bad design. Looking at abscates pic, I'm thinking that maybe one could keep the o-ring in its recess from the pump side while pushing the pipe through from the back.
But I think it would take a doctor of a specialized nature, ie one who has a great deal of sensitivity and dexterity with their index finger, to be successful at it.
That sharp cut edge that you see is the problem with getting the pipe to go in past the o-ring. That's why I'm contemplating trying to tapper it a little. But the main problem is that the o-ring just seems too small to begin with. It should " spring " into that recess and stay snug, but if the ring is seated in the lower part of its recess, then it doesn't go in at all in the upper part, and will be pushed right out.

[454cid]

That sharp cut edge that you see is the problem with getting the pipe to go in past the o-ring. That's why I'm contemplating trying to tapper it a little. But the main problem is that the o-ring just seems too small to begin with. It should " spring " into that recess and stay snug, but if the ring is seated in the lower part of its recess, then it doesn't go in at all in the upper part, and will be pushed right out.

I think the o-ring you have is too small. You could try ordering another, but you may also measure what you've got and ordering a larger size from an industrial supply house. O-rings are standard sizes.

[Sveedy]

Nice pictures. Where is the o-ring? Sveedy, do you have a picture of the back of the coolant pump with the coolant pipe removed? From your description, I can't picture how it works.

I have a spare block I take take a pic of. It's just a smooth surface IIRC, press fit with the coolant pipe.

Correct. Smooth bore with a recess cut to accept the o-ring.

That sharp cut edge that you see is the problem with getting the pipe to go in past the o-ring. That's why I'm contemplating trying to tapper it a little. But the main problem is that the o-ring just seems too small to begin with. It should " spring " into that recess and stay snug, but if the ring is seated in the lower part of its recess, then it doesn't go in at all in the upper part, and will be pushed right out.

I think the o-ring you have is too small. You could try ordering another, but you may also measure what you've got and ordering a larger size from an industrial supply house. O-rings are standard sizes.

That's my thought, though it is the oem one. I'm hoping that I will be able to get my hand in there enough to feel the o-ring while pushing the pipe. Might take three hands for this.

[454cid]

That's my thought, though it is the oem one. I'm hoping that I will be able to get my hand in there enough to feel the o-ring while pushing the pipe. Might take three hands for this.

I wonder if maybe you got the wrong o-ring.... maybe the wrong part was pulled for your order, or even packaged incorrectly? In my non-Volvo experience rubber gaskets that fit inside of something usually feel borderline too big rather than too small.

[volvolugnut]

That's my thought, though it is the oem one. I'm hoping that I will be able to get my hand in there enough to feel the o-ring while pushing the pipe. Might take three hands for this.

I wonder if maybe you got the wrong o-ring.... maybe the wrong part was pulled for your order, or even packaged incorrectly? In my non-Volvo experience rubber gaskets that fit inside of something usually feel borderline too big rather than too small.

I agree. O-rings are not possible to label with a part number. They must be packaged properly through the entire supply chain to get the proper size. Keep in mind O-rings do not really get squeezed, they get the shape deformed to seal.

volvolugnut

[bmdubya1198]

Yup, there is a groove.

[Sveedy]

Yep. Just how it SHOULD look. But the new one just slopped around in there. I could see how it would work, once on the pipe end, but getting there is the obvious problem.
Looking at that pic, I'm wondering if I get a better sized o-ring, and use some sealant, that maybe I could avoid pulling the water pump ? Yes, ...I'm trying to avoid doing that after just getting everything back together.

[FireFox31]

That sharp cut edge that you see is the problem with getting the pipe to go in past the o-ring. That's why I'm contemplating trying to tapper it a little. But the main problem is that the o-ring just seems too small to begin with. It should " spring " into that recess and stay snug, but if the ring is seated in the lower part of its recess, then it doesn't go in at all in the upper part, and will be pushed right out.

Here's what I'm picturing based on the description. Does this look right? Seems like the only way to install it is carefully push the pipe in from the back with no real way to see the o-ring during the process since it's in a recess.

Was the o-ring you got the official Volvo part number? Maybe it's meant to be that tight, which would stink. Perhaps put it on the pipe, not installed, for a few days and hope it stretches out.