quick water pump o ring question

[Bank of SHO]

I just finished installing my water pump, but I'm second guessing myself on the o ring position. I know where the thin o ring goes - in the grooved portion of the pump that connects to the block.

I'm not sure about the thick o ring that seals the metal tube from the engine to the pump. Does this o ring slide over the tube from the engine to the point where the tube bulges, or does it sit on the end of the tube? I installed it on the ****** portion in the water pump and used dielectric grease to hold it in place in the pump before mounting the assembly to the engine. Was this incorrect? What is the purpose of the engine tube bulge?

 

[notstock]

Bank of SHO:
Does this o ring slide over the tube from the engine to the point where the tube bulges, or does it sit on the end of the tube? I installed it on the ****** portion in the water pump and used dielectric grease to hold it in place in the pump before mounting the assembly to the engine. Was this incorrect? What is the purpose of the engine tube bulge?

Is it leaking? It should be. The tube you're refering to is called the crossover tube - it runs across the valley of the block and the other end connects to the contraption that the thermostat mounts to. The larger o-ring gets installed between the two bulges in the crossover tube. Once it's on there, put some coolant on it to help **** it, then slide the pump onto the end of it, drawing it tight with the mounting bolts. The coolant on the o-ring acts kinda like a lubricant, helping to keep it from rolling oiut of place, past the 'inside' bulge.

Hope it's not all put back together!

Kurt
www.kurtmetros.com

 

[Bank of SHO]

I'm still uncertain. Sorry. I have not proceeded beyond the water pump and cps sensor, so redoing it will be easy once I understand the placement. Tell me which option is correct:

1. The o ring slides over (i.e the outside diameter) the crossover tube down to the point it starts to bulge outward (passenger side of bulge). This then compresses the o ring against the inner ****** portion of the water pump housing. Correct or not?

2. The o ring slides inside (i.e. the inside diameter) of the crossover tube and sits inside the tube between the inner sides of the bulge. If this is the case, I don't understand what it is sealing against as the water pump housing fits over the crossover tube.

I will gladly wear the dunce cap as long as I get this right.

Thanks,
Tom

 

[Bank of SHO]

BUMP. Anyone? Scott?

I'd hate to get this far only to have to tear it apart again.

 

[DavidT]

does this help?

I ought to be an expert in this field
I wish I paid more attention to detail when I do things (as far as remembering things and how they look and function)!
Clean engine, huh?

<small>[ April 20, 2003, 12:46 AM: Message edited by: dkautumna ]</small>

 

[notstock]

Bank of SHO:
2. The o ring slides inside (i.e. the inside diameter) of the crossover tube and sits inside the tube between the inner sides of the bulge. If this is the case, I don't understand what it is sealing against as the water pump housing fits over the crossover tube.

Tom,

I think number 2 is the correct way. I can't really tell 100% for sure from your description, so I'll try mine again.

The crossover tube has two bulges on the end of it - kinda like hills, with a valley between them. The o-ring goes in the valley. You need to **** it, otherwise when you slide the pump over the end of it, it may 'roll' the o-ring over the second, or inside bulge and cause it to not seal properly. It seems like it would never hold without leaking, but it does - that's probably why it doesn't make sense to you - it almost doesn't seem possible!

In the picture above you can kinda see the valley - there is the bright band on the end, then the dark band, then the second bright band, then the tube continues on. The o-ring goes where the dark band is.

If you're still unclear, perhaps someone else can try to describe it to you.

Kurt

 

[Bank of SHO]

Thanks guys! I think I understand now. To clarify, the o ring does wrap around (over/outside)the crossover tube and between the outside bulges? I confused the issue because I forgot about the first(end) ******/bulge. I just want to be sure you don't mean the o ring actually sits inside of the tube which doesn't make sense to me.

The picture is a great help. Thanks. I did a search, but in the posts with pictures, the pictures didn't show up on my computer. This happens too frequently for me.

Again I'm sorry for being so dense, but I have to be certain. I'd rather be cautious than sorry. Anyway, thanks for being so patient with me.

Tom

 

[shojuan]

You got it. Glad you didn't put it back together before Kurt could help you. So to clarify, the o-ring doesn't go *into* anything. It doesn't go inside the crossover tube, it doesn't go inside the water pump housing (until you slide the water pump onto the crossover tube). It fits into that little nook on the end of the crossover tube. Make sure it's lubed with something like Kurt says. Coolant, silicone grease, KY jelly will work fine. Wouldn't use a regular grease though because the rubber will break down.

 

[Bank of SHO]

Great! Thanks guys. I really appreciate your help. cheers

Tom