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Oil trap/breather box failure?

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

beigg
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Re: Oil trap/breather box failure?

Post by beigg » Fri Jul 01, 2016 5:07 pm

n/a? or fi?
ugh smh 850 Turbo fridge

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erikv11
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Re: Oil trap/breather box failure?

Post by erikv11 » Fri Jul 01, 2016 5:48 pm

OP, what are you asking, for ideas about where the oil is leaking from? The bottom line on that question is always to clean the engine and then see where it gets wet with oil first - track it down. We cay try to help if you provide pictures =, but in the end it will likely come down to the previous point.

What do you think caught on fire, oil?

There was no EGR in 1998, so that's not an issue.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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erikv11
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Re: Oil trap/breather box failure?

Post by erikv11 » Fri Jul 01, 2016 5:58 pm

Ah OK I see, thanks.

When you did the PCV service, did you check the ports that drain oil back into the block? If they get clogged, then just changing the parts will not solve the positive crankcase pressure. That's one possibility.

EDIT: oh, another possibility: are you sure the hoses on top of the oil trap are not reversed? That can cause it, too.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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erikv11
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Year and Model: 850, S/V70, 06 S60R
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erikv11

Re: Oil trap/breather box failure?

Post by erikv11 » Fri Jul 01, 2016 7:42 pm

You can check the routing of the two hoses on top of the oil trap without re-doing the whole thing. I would definitely check.

But yeah, if you did not clean out the ports into the block, or at least check them, then you probably do need to take it off and do that. Was the PCV really clogged before?
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

tryingbe
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Re: Oil trap/breather box failure?

Post by tryingbe » Fri Jul 01, 2016 8:31 pm

I had a MotoRad filler cap that leaks when it was brand new! Is the filler cap a Volvo one? Has the filler cap seal been changed?


I found with the older engines, even with new PCV parts, it is not enough. The stock PCV pipe from the separator to the intake is severely undersized for an older engine. Also, the hole at the heating element at the PTC valve is tiny, like smaller than 1/4 inch tiny. Both will restrict the flow of the crankcase gases.

To address those issues, here is what I do. Get the below parts.

A 3ft 5/8 oil compatible hose. Do not use silicone hose, as it will "sweat" oil. Do not use heatercore hose, it is not rated for oil, it will become soft and you'll have to replace it sooner. This is what I use. Buy 3, as it is sold by the foot.
http://www.ebay.com/itm/291442927889?_t ... EBIDX%3AIT

One 3/4 elbows from your local hardware store. (5/8 will be the wrong size!)

A 3 feet 3/16 inch or 1/4 inch vacuum hose to replace the small hose from the intake manifold to the PTC valve. I prefer silicone hose for this.

Optional, get 6 of this. I like their clamps.
https://www.ipdusa.com/products/4768/10 ... 12mm-width

Optional, wireloom to protect the hose.

Take a unibit and drill out the PTC valve holes to as big as you feel comfortable. I think I drilled mine out to about 1/2 inch.

Remove the intake manifold and replace that stock PCV hose, I cut a short hose and then use a 90 degree elbow, than a long hose to the PTC valve. Replace the vacuum hose to the intake manifold to the PTC valve with the new one. Then reinstall the intake manifold.

Image

Image

All the crankcase gas have to go thru that tiny PTC hole!!!
Image

Installed on car
Image

Image
85 GLH, 367 whp
00 Insight, 72 mpg

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theWIFES_S70
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theWIFES_S70

Re: Oil trap/breather box failure?

Post by theWIFES_S70 » Fri Jul 01, 2016 9:07 pm

Wow, this looks like an absolute necessity... (And cheaper than OEM...)
1998 Volvo S70, N/A, 5-speed, 185K
2007 Volvo S40, 2.4i, 5-speed, 99K

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