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1995 850 T5-R Engine "rumbling" and "gurgling"

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Seaweed
Posts: 5
Joined: 09 Aug 2024, 14:45
Year and Model: 1995 850 T5-R
Location: Perth, Australia

Post by Seaweed »

Hi guys, first poster here.

Been digging and digging and digging and didn't find anything so I decided it was about time to post something myself.

My '95 T5-R is misbehaving (a lot). I'm getting some interesting sounds from the block and they're simply nothing I've ever heard before. It's a sort of rumbling and gurgling and I'm not quite sure what to rip out first. The noises seem to be coming from the lower end of the block, but it's hard to tell. I know I have a couple of gremlins in the engine, but it generally runs fine and idle is steady at about 900rpm. Engine feels and sounds healthy outside of this one weird noise. I'll be doing a compression test over the weekend at some point, and I'll have a video of the engine noises up here tomorrow, but it's a bit difficult to test the engine by itself since I also have a pretty major boost leak in my intake, so no hard revving.

Not exactly expecting much before I get some soundbites up, but if anyone knows anything then that would be lovely.

Cheers! :D

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Clemens
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Post by Clemens »

no clue ... but I'm fascinated by the symptom itself. Hopefully we'll find out what it is with a soundfile...
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scot850
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Post by scot850 »

Mostly blocked PCV tube blowing into the oil pan? Engine oil cooling thermostat failing (normally more of a whistle).

Neil.
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Seaweed
Posts: 5
Joined: 09 Aug 2024, 14:45
Year and Model: 1995 850 T5-R
Location: Perth, Australia

Post by Seaweed »

Clemens wrote: 09 Aug 2024, 15:53 Hopefully we'll find out what it is with a soundfile...
Got a soundfile here, tried to get some different angles. Try not to mind the belt making some weird noises, it generally goes away after a couple of minutes of running (might be bad as well to be honest). I still have no clue at all as to how I'm supposed to identify this without ripping the entire block apart... :cry:


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misha
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Post by misha »

Sounds like some bad pulley to me.
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History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon

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BlackBart
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Post by BlackBart »

Yeah. Water pump failing?

Maybe it has 10 quarts of oil in it and the crank is swimming….
ex-1984 245T wagon
1994 850T5 wagon
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Seaweed
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Joined: 09 Aug 2024, 14:45
Year and Model: 1995 850 T5-R
Location: Perth, Australia

Post by Seaweed »

BlackBart wrote: 11 Aug 2024, 09:12 Yeah. Water pump failing?
Ahh this is somewhere to start, I'll have a look at it tomorrow. Good excuse to find out why my belt tensioners are acting up too while I'm down there.

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BlackBart
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Post by BlackBart »

Cheap auto stethoscope, poke around and see if you can trace the noise (could be two different noises), but DON"T stick it into any moving parts!
ex-1984 245T wagon
1994 850T5 wagon
2004 XC70 wagon BlackBetty

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Seaweed
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Joined: 09 Aug 2024, 14:45
Year and Model: 1995 850 T5-R
Location: Perth, Australia

Post by Seaweed »

Okay so after poking and prodding a bit around the lower part of the block, it seems to be a bad water pump that's making the weird noises. Belt was replaced about 8000km ago by someone else so I assume they either did something wrong then or they just didn't catch it/cared to fix it. Either way it's a bit of a messy job as far as I'm aware. Is it generally recommended to change the belt if it's been in contact with coolant or should it be fine since it's such a fresh belt?

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misha
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Post by misha »

If it's not contaminated...leave it.
It's not hard job...but scraping the old gasket is a pain because of bad access.
Don't scrap it with a razor blade or metal scraper.
Use plastic scraper since you don't want to leave scars on mating surface.
2010 S80 D5 / restyling / fully equipped / Twin turbo / Savile Gray Metallic (492)

History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon

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