I'm guessing the pcv system is marginal. It certainly hasn't been done since I've had it. I see much evidence of crankcase overpressure however, and I doubt that would cause a major seal blow out like this. I'd expect more gradual leakage from all the seals and dipstick tube.
That's on my to do list.... guess it's moved up a bit now.
I've been planning to do a full head job which would include the pcv since as far as I know it's never been touched and I'm guessing the head is pretty well worn. I've got a rebuilt head to go on there and have had all the parts for close to 2 years.... just never got the motivation up to tear into it. Wound up rebuilding my truck motor this spring and that sort of sapped all my mechanic desire for a bit, and now all my tools and such are boxed up and in storage since I moved out of the place I was in that had space to work on stuff and am going to move again to central CA next March... should be able to get it fixed there though.
Given this little bombshell, I'll probably just drop the entire subframe assembly and do the head job and rear main like that - not worth messing about trying to do it the car if I'm going in that deep.
Probably go ahead get the turbo rebuilt too... what's a good source for a CHRA for one of these? (center section of the turbo)
98 V70 T5 Major Oil Leak
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rspi
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I've never heard of a head wearing where it needed to be replaced. That's a new one on me. I've known people with more than 500,000 miles on these white blocks with no motor issues.
As for the PCV causing seal blow out issues, sad to say that happens a lot. That is how I blew the 2 cam seals out of our S70 motor. One nice kick on the gas pedal and pressure can build up pretty quick in the motor. The weak link will give.
The good thing is, it sounds like you know how to deal with stuff like this. If I were you and you plan to pull the head, just jerk the motor & trans out and deal with it out of the car.
As for the PCV causing seal blow out issues, sad to say that happens a lot. That is how I blew the 2 cam seals out of our S70 motor. One nice kick on the gas pedal and pressure can build up pretty quick in the motor. The weak link will give.
The good thing is, it sounds like you know how to deal with stuff like this. If I were you and you plan to pull the head, just jerk the motor & trans out and deal with it out of the car.
'95 855 T-5R M, Panther - 22/28 mpg, 546,000 miles
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
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Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos
'95 955 T-5R Yellow Wagon, Lemonade, 180,000 miles
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos
Well, about a year later and I finally got to working on this rig. Pulled the motor/trans, and sure enough the rear main seal was pushed out to where it was not touching the block anymore. Not sure why though. The PCV was somewhat carboned, but not enough to plug it up front what i could tell. No signs of damage/leaks on other seals either. I'd expect that if the crankcase pressure was high enough to push a seal out then I'd have seen some leakage from other seals and the dipstick getting pushed up. The seal was replaced when i did the trans about 60k miles ago, so maybe something went wrong there. Oh well, it's got a new seal and new PCV system now.
More interesting though was finding that I've been running around with a broken head bolt for some time - best guess is over 60k miles!
The reason I say 60k is that's how long I've had the car and when I got it there was some evidence of a blown head gasket but it seemed to go away. The car was sold with a blown trans, but it also has some white goop on the dipstick characteristic of water in the oil. Since it had been sitting for a while in a humid area and wasn't much goop I thought maybe it was just condensation and figured I'd try changing the oil and driving it. Seemed to work since there was little goop and no coolant loss, though it did take a few oil changes to totally clean up. Looking at the head now though, it looks like the bolt broke around then and it was weeping a bit through the gasket. Something of a wonder that it sealed up though and never caused any other problems. Never had any coolant loss or other symptoms, and while I don't hammer on the car, it did get run decently hard.... enough that I'd never expect a broken head bolt to go unnoticed that long!
More interesting though was finding that I've been running around with a broken head bolt for some time - best guess is over 60k miles!
The reason I say 60k is that's how long I've had the car and when I got it there was some evidence of a blown head gasket but it seemed to go away. The car was sold with a blown trans, but it also has some white goop on the dipstick characteristic of water in the oil. Since it had been sitting for a while in a humid area and wasn't much goop I thought maybe it was just condensation and figured I'd try changing the oil and driving it. Seemed to work since there was little goop and no coolant loss, though it did take a few oil changes to totally clean up. Looking at the head now though, it looks like the bolt broke around then and it was weeping a bit through the gasket. Something of a wonder that it sealed up though and never caused any other problems. Never had any coolant loss or other symptoms, and while I don't hammer on the car, it did get run decently hard.... enough that I'd never expect a broken head bolt to go unnoticed that long!
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