Hi guys!

So I'm new here, shout out to Les for sending me here after he spotted my ad on Gumtree for trying to get rid of this beast.

About 2, 3 weeks ago, I bought a Volvo 850 from perhaps the sweetest lady I've ever met in my life, and although it made it home, the oil light came on basically as soon as I got into the driveway. Me being the stupid one forgot to check the oil before I left but it hadn't been shining at all on the way home. I, perhaps carelessly, drove the car to the nearest servo, not even 5 minute drive away.

I am used to my old car, an 89 Telstar, which will shine the oil light on for weeks before it actually runs out of oil, so I didn't think a quick shoot up to the servo with it on would cause too many issues.

Oh how wrong I was, about a kilometre short of the servo, the engine pumped out a pile of smoke, it was grey and had the worst burnt smell I've ever encountered in my life.

I checked the oil and the dipstick did not show a reading (must have been pretty low!)

We went to the servo (via other means of transport) and bought some oil and filled it, and no it didn't magically fix my engine.

I went back home and grabbed my Cross Country wagon and drove back and towed the 850 sedan home, as I didn't want to do any more damage to the motor.

Over the next few days I kind of gave up pushing the car around and just decided 'screw it' and started it anyway. The first few times it didn't start. It was really hard to get it to start, and then to stay running, and it poured out thick grey smoke and ran like a tractor, maybe worse.

BUT! The weirdest, most confusing part, is that the car seems to be slowly healing itself. These days it will start first time, every time, and it runs pretty much the same as it did before the incident. It pours out a cloud of white smoke. Actually, the smoke isn't there when you just start it, it takes a few minutes to come through as the car warms up. The smoke is more like steam, it is virtually pure white, has no burnt smell, but does have a slightly sweet smell to it. It gets very very thick as the engine warms up, to the point where I'm flooding all of the neighbours houses so I have to turn it back off. I would describe it as very close to head gasket smoke. But that doesn't really add up now does it? I don't recall my car overheating at any stage!

Basically, I have no idea what to do with the car. It is currently advertised on Gumtree as for parts. I have a rare 850 because everything on it (except the engine) actually works. Yes, thats right, even all the typical things like the odometer and ABS. The last owner has already fixed them all so it was actually a good find!

Im asking $600 for it as that is what it owes but realistically offer me anything more than like $350 and its yours.

Otherwise, any advice on what to do is much appreciated! Ill be doing a compression test in the following few days. Removing the spark plugs should be enlightening, as they should be covered in whatever vital fluid is getting into the cylinders that shouldn't be.

Les offered me a new motor/gearbox combo but I don't have the facilities to change it myself and any mechanic is going to charge way too much to do it, so it isn't really worth it.

Id love to buy an 850 with a working motor/gearbox, and everything else broken and just shift everything across and make one good 850 out of two bad ones, but haven't had much luck with that either.

I took a few photos of the beast, the smoke in these photos doesn't really happen anymore, its thicker, but whiter and doesn't smell like destroyed engine.






I also have a Volvo Cross Country wagon which sometimes gives me gremlins, I made a separate post about it!

Thanks!
-Jeremy
Looks like a blown hg due to to a combination of issues.
If the weather holds off Ill do a compression test today and hopefully the spark plugs will reveal whats wrong with it.

not sure how it could have blown a head gasket, does seem at odds with what was actually happening, i don't believe it overheated haha
I had a 850 10valve that I got of mark, it started of blowing loads of smoke so I flogged it around the block a few times as it had been sitting for almost a yr, the smoke went away while I woz driving it home, but then it blew it's heater core, I got it towed back to Berrys, heater core fixed, drove it home and on the way the gear selector started shaking really bad, I got it home ok but then I went to start it the next day and tryed to move it and it shook like anything then with my foot to the floor it woz creeping foward, there went the gearbox!, maybe I drove it a bit hard on the way home, lol, that's enough 850s for me, they just can't take the hard driving in my opinion, there were a few other issues like that it had a few wholes in the muffler, so when I woz on the freeway it was growling louder than an 850r, so I ended up getting rid of it, too much of a money pit ;)

I'd say that Alex is right, you've definetally got a head gasket problem on ur hands
If you've lost all the oil which lubricates the engine and also does some cooling, you will find that there will be other damage.
I have tried to see if the smoke would disappear by running the car for a while but it seems to just get thicker and thicker.

Everyone has told me 850s are the most reliable of all the 5-pot Volvos haha, cos once they went all technical with the ETMs they went a bit sour, and the gearboxes on my version aren't exactly anything to run home about, in terms of reliability anyway!

I just did a compression test, I started from cylinder closest to the timing belt (I call it cylinder one, some call it number 5). I had to do three tests, I was getting such mixed results, the first two I did with the engine cold. I then put the spark plugs back in and warmed it up to the point there was smoke coming out of the exhaust and was flooding the neighbours back yard, and then I called that "warm" (the spark plugs were hot if nothing else).

Cylinder 1: 155psi/159psi/185psi
Cylinder 2: 186psi/207psi/185psi
Cylinder 3: 200psi/200psi/186psi
Cylinder 4: 198psi/206psi/185psi
Cylinder 5: 210psi/220psi/195psi

Im not sure if its a head gasket or not, and even if it was to fix that Im not sure what other damage there is from running the car on such a low oil amount. Should I even bother investigating further or just cut my losses and run?
Valve stem seals?
Blocked crankcase oil breather box and hoses.
Darcy , I think you crushed a perfectly good 850..... Esp after replacing the bits.
What a waste.
If you treat your cars like that you will be crushing the rest of em too...
Valve stem seals are way out of my department haha. Would that be something that builds up over time? This happened like an explosion, it was fine and then BOOM cloud of smoke BUT there was no noise so the engine didn't explode literally.

Anything to do with the crankcase oil breather stuff is completely unfamiliar to me as its kind of complicated on the Volvo haha.

Who crushes a good 850! They're so rare, there is at least something wrong with all of them!
I started it up before to warm it up after the "cold" compression test so I could do a "warm" comp test, and I waited until the smoke was at its usual worst thickness and got some snaps for you:




Its white, and thick, kind of sweet smelling, gets progressively thicker until its at about this thickness. It will fill up the neighbours backyard in about 2 minutes at this thickness hahaha!

This was just idling by the way, it just pumps it out faster when you rev it so I never do. Car hasn't gone above 1500 rpm in weeks lmao!
Sweet smell is coolant so HG .
My motor in it or pull off the bits like the inlet Mani and ancilliaries and the ABS unit , radio and crush it?
I got $80 odd dollars for mine without the motor n box or front guards......
Yep. Sounds like hg as I said before. You ran it out of oil. Im interested to assist you in pulling the head off to inspect it and possibly fix it if you want, im in Mulgrave and most of the time have a mobile workshop in my car when needed.
Ex850R;25952 wroteSweet smell is coolant so HG .
My motor in it or pull off the bits like the inlet Mani and ancilliaries and the ABS unit , radio and crush it?
I got $80 odd dollars for mine without the motor n box or front guards......
Yeah it had a burnt smell straight after but thats gone its now sweet and much closer to head gasket smoke.
Your motor in it might be too expensive but is definitely on the table. If I had a workshop I'd do it!
And yeah Id keep the 'common fail points' on the 850s and put them to one side and flog the rest. Ive been given $200 for what is basically a shell with an engine that didn't run before so Im sure Ill get something
Vee_Que;25962 wroteYep. Sounds like hg as I said before. You ran it out of oil. Im interested to assist you in pulling the head off to inspect it and possibly fix it if you want, im in Mulgrave and most of the time have a mobile workshop in my car when needed.
Yeah Im not sure on the hg. Its starting to look more like it. But I still feel uncomfortable, i don't know what other damage (if any) has been done by not having any oil in the engine.

I drove out to Berry Motor Group (Volvrek) and they are so good out there, they are probably going to be my new mechanic (closer than Keilor), he suggested it could also have a blocked "oil breather system" (I have absolutely no idea what that is). But Id have to work out a way of getting the car down there to confirm.

Id love to have a hand to pull the car apart or at least get a diagnosis, but Im a broke uni student and don't want to spend too much coin in repairs if I don't have to/need to. Id almost prefer to find a replacement 850 and transfer the good parts over and make one great 850 but we'll see about that one haha.
rather than fartassing around with what sounds like a cactus engine, make a table out of it, and put a T5 into it.
blondejay;26042 wroterather than fartassing around with what sounds like a cactus engine, make a table out of it, and put a T5 into it.
Two Jay's, thats confusing haha!
Yeah I would if I could:
1. afford it.
2. be bothered

Im probably just going to end up pulling a few "good" bits off it and sending the rest to the wreckers and cutting my losses and buying another car, or just sticking with V70.
I have a V70 T5 here with a perfectly good B5234T3 engine in it if you're seriously considering a conversion.
jamesinc;26051 wroteI have a V70 T5 here with a perfectly good B5234T3 engine in it if you're seriously considering a conversion.
Really haha? Whats wrong with the rest of it, Id rather a V70 over an 850 any day!
I thought they changed the engine between the 850 and V70 updates? No?
Whoa thats actually a nice car, I would indeed take that over the 850 but you're in Sydney and by the looks of it I can't exactly drive it back haha.