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leaking coolant pipe

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.

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j-dawg
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leaking coolant pipe

Post by j-dawg » Mon Dec 30, 2019 9:22 pm

Just got my engine almost fully hooked up, started pouring coolant in.....and it leaks at the pipe behind the water pump (ie at #16 in the image attached). It's a fast leak. Can't really drive the car like this. I think I replaced the o-ring, but it came in a kit and it did feel a little loose so it may have been the wrong part. Should have put water in it before, I guess - lesson learned.

It's gonna be several days' work to get the engine back out and in again. Anyone removed this pipe / sealed a leak here with the engine still in the car? Any suggestions? It seems like kind of a nightmare - the bolts holding the pipe to the engine are under the exhaust manifold, and the turbo is fully installed and hooked up.
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1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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Re: leaking coolant pipe

Post by j-dawg » Mon Dec 30, 2019 10:58 pm

All right, desperate Google users finding this page years in the future. I knew I wasn't pulling this damn motor again so I set my jaw, cursed at the car more densely than I have in seven years of owning it, and got the pipe slid far enough over to get the o-ring out. It was actually cut into two pieces, so maybe I used too fat of an o-ring, and it felt loose after it tore in half. Kinda curious what the seal I used is actually for.

I don't think getting it out would have been possible without removing a huge amount of stuff that fortunately didn't have any fluid in it yet - power steering hose at the top of the reservoir, turbo oil drain line, turbo oil fill line, turbo coolant drain line, and turbo coolant hoses. I also had to dismantle the entire intake and the heat shields on the back of the engine.

I'll cry myself to sleep tonight and get the right seal at the dealer tomorrow.
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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Re: leaking coolant pipe

Post by abscate » Tue Dec 31, 2019 6:07 am

Ugh.

Bookmarked for inclusion of part numbers

I’ve always looked at that pipe in terror of moving it. If you have it off, I would be interested in how easily the brass cooling system drain cock releases , too.
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Re: leaking coolant pipe

Post by bmdubya1198 » Tue Dec 31, 2019 8:44 am

That pipe is a bear to remove... I pulled one off an '05 S60R along with the K24 turbo for my car. I dread actually replacing it on mine.

I've heard that it makes it much easier to remove the water pump to install that pipe. That way you can make for certain that the o-ring is seated properly and not crushed.
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

j-dawg
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Re: leaking coolant pipe

Post by j-dawg » Wed Jan 01, 2020 11:31 am

The dealer had just one o-ring, so I should be back in business today. They consistently surprise me with how much weird stuff they have out back.
abscate wrote:
Tue Dec 31, 2019 6:07 am
If you have it off, I would be interested in how easily the brass cooling system drain cock releases , too.
As much as I'd love to help answer that question, I'm gonna let sleeping dogs lie. But if you have a 99+ car, the oil cooler hoses are very low on the engine. Between those and the lower radiator hose, you can drain the block pretty thoroughly without tempting fate :)
bmdubya1198 wrote:
Tue Dec 31, 2019 8:44 am
I've heard that it makes it much easier to remove the water pump to install that pipe. That way you can make for certain that the o-ring is seated properly and not crushed.
This would have been smart when I was putting the motor together. There is a pretty easy way to check with the water pump in - put water in the reservoir, and if you find yourself screaming and red-faced with rage, you crushed the o-ring.
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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bmdubya1198
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Re: leaking coolant pipe

Post by bmdubya1198 » Wed Jan 01, 2020 6:18 pm

j-dawg wrote:
Wed Jan 01, 2020 11:31 am
This would have been smart when I was putting the motor together. There is a pretty easy way to check with the water pump in - put water in the reservoir, and if you find yourself screaming and red-faced with rage, you crushed the o-ring.
Works like a charm!
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

j-dawg
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Re: leaking coolant pipe

Post by j-dawg » Wed Jan 01, 2020 11:48 pm

Much less painful getting everything back together once I'd seen how it came apart. I hit the pipe with 1000 grit to get any crusty junk off, greased up the seal and pipe, and it all went together smoothly. And no leaks!
1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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bmdubya1198
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Re: leaking coolant pipe

Post by bmdubya1198 » Thu Jan 02, 2020 8:40 am

Awesome, now it's sounding less scary for when I need to replace it in my car!
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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