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Cooler Oil Hose O-Ring Replacement

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Rodplunger
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Cooler Oil Hose O-Ring Replacement

Post by Rodplunger » Tue Jan 07, 2020 7:09 pm

Hi All,
This might be somewhere else, but I can't find it... I am replacing a leaking O-Ring on the cooler hose at the radiator fitting. The new ring is obviously still "large" and is not going into the housing with any ease. Are there any tricks to getting the new o-ring in? Grease? I would guess the oil itself would be enough lube, but I can't for the life of me get it to slide in... I am putting an OEM o-ring in that I bought at a dealer. Thanks for any advice.

I have attached photos of the before and after. The black one was the leaking gasket. It was firm and brittle. The green one is the OEM from the dealer. It is obviously larger than the original, as it should be. The other picture shows how far I can get the green ring into the fitting...
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hausmeister
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Re: Cooler Oil Hose O-Ring Replacement

Post by hausmeister » Wed Jan 08, 2020 2:08 am

You can use silicone grease/spray or just engine oil... any oil should be fine I think.
If I remember correctly they can be a bit hard to get in (what she said) try some force as long as the oring is not cut up it should be fine.
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Re: Cooler Oil Hose O-Ring Replacement

Post by abscate » Wed Jan 08, 2020 4:30 am

A vice grip clamped on the back of the metal pipe, behind the flange, will give you good leverage your push that in
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Re: Cooler Oil Hose O-Ring Replacement

Post by volvolugnut » Wed Jan 08, 2020 6:23 pm

That O-ring does not have the 'look' of a typical O-ring sized for sliding fit. Perhaps the dealer supplied the O-ring for transmission cooler? Does it fit the groove width with a little gap? It kind of looks like the cross section diameter is too large for this application. That would make the outside diameter too large even if the inside diameter is correct.
When an O-ring gets compressed and flattened it has to expand in width. It does not really get compressed, it gets deformed.
I used to design O-ring sealing joints for machinery.
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Re: Cooler Oil Hose O-Ring Replacement

Post by Rodplunger » Wed Jan 08, 2020 6:49 pm

I went to a different dealer, and it seems they gave me the wrong one. I picked up a black one that was much more similar to the one I pulled out of the car. I believe you are right about the green one being for the thermostat side... The new one fit very easily. Now to check for leaks.

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Re: Cooler Oil Hose O-Ring Replacement

Post by abscate » Wed Jan 08, 2020 7:48 pm

volvolugnut wrote:
Wed Jan 08, 2020 6:23 pm
That O-ring does not have the 'look' of a typical O-ring sized for sliding fit. Perhaps the dealer supplied the O-ring for transmission cooler? Does it fit the groove width with a little gap? It kind of looks like the cross section diameter is too large for this application. That would make the outside diameter too large even if the inside diameter is correct.
When an O-ring gets compressed and flattened it has to expand in width. It does not really get compressed, it gets deformed.
I used to design O-ring sealing joints for machinery.
volvolugnut

This is a truly great , on point post with keen observational skills

+1000 MVS points and three passes for missing Oxford Commas, non-expiring and can be retroactively applied.
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Re: Cooler Oil Hose O-Ring Replacement

Post by volvolugnut » Thu Jan 09, 2020 4:03 pm

abscate wrote:
Wed Jan 08, 2020 7:48 pm
This is a truly great , on point post with keen observational skills

+1000 MVS points and three passes for missing Oxford Commas, non-expiring and can be retroactively applied.
Thanks for the kind words. This old dog can still hunt.

volvolugnut
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

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