Solved - Pressure in oil pan - pushes dipstick out Topic is solved

[Dan McBoost]

Previous to recent repairs:
Oil cap fill location failed the rubber glove test (checked because of oil leaks).
Glove filled up with air.
Noted normal gas mileage 17-20MPG.


Repairs done:
12/15 2015: Replaced the complete PVC system with this kit:
http://www.ipdusa.com/products/11110/12 ... xc70-turbo
12/15 2015: Also replaced the timing belt, waterbpump, alternator, thermostat with all new parts (from IPD (except the alt)).


Current new issues:

• very bad gas mileage (~8-10mpg, but I have not filled it up yet)
• oil dip stick gets pushed up and oil does spray out.
• high pitched noise, which sounds kind of whistle like. When the engine is shut off, still makes the noise after the engine stops, but then fades away.

The PTC nipple is clear and the valve cover now has great vacuum (does not fail the glove test).

Does anyone have any idea or ideas of what to start with? A bunch was replaced with new and I am at a loss of ideas.

Thanks so much in advance!

[scot850]

Welcome.

If this problem was not there before you did the work, then the usual advice is to re-check what you have done. Check all vacuum pipes have been replaced in the correct locations, check the PCV pipe have been placed on the correct outlets on the catch tank (easy to make a mistake on the top 2).

When you did the repairs, did you:

1) Clean out the pipe in the block where the lower short metal covered pipe goes into the block and down to the oil pan?

2) Clean the PTC nipple on the turbo intake pipe?

My suspicions are that you have connected a pipe to the wrong location or caused a blockage which is making the crankcase pressurise, hence the oil dipstick getting blown out.

Neil.

[Dan McBoost]

Welcome.

Thanks Neil! I have been lurking around here and found it to be the best for DIYers.

If this problem was not there before you did the work, then the usual advice is to re-check what you have done. Check all vacuum pipes have been replaced in the correct locations, check the PCV pipe have been placed on the correct outlets on the catch tank (easy to make a mistake on the top 2).

Well my thought was before it had pressure in a different spot, so maybe the problem moved when I replaced the other stuff.

did you clean out the pipe in the block where the lower short metal covered pipe goes into the block and down to the oil pan?

I did visually check it and stuck stuff in it (including a inspection camera), it did not look to be crudy at all.

did you clean the PTC nipple on the turbo intake pipe?

yes, it is also clear. I checked it again last night.

My suspicions are that you have connected a pipe to the wrong location or caused a blockage which is making the crankcase pressurise, hence the oil dipstick getting blown out.

After looking at this topic, the breather box is just hallow. Why would that make a major difference like this?

Could a check valve be broken, or installed backwards? The car had a rough life before I got it, so anything is possible.

[kahl]

I am trying to get my head around how the dip stick is pushed out yet there is negative pressure at the top of the engine as proven by the glove test. Does your oil dip stick have "O" rings at the top? The only way I know of to check that port leading to the oil pan is clear is to hook a hose to it and blow bubbles. I seem to recall there was some misleading diagrams as what hose goes to what port on the box.

[Dan McBoost]

I am trying to get my head around how the dip stick is pushed out yet there is negative pressure at the top of the engine as proven by the glove test.

exactly.

Does your oil dip stick have "O" rings at the top?

at the top? I did replace the one at the bottom (came with the PCV kit).

The only way I know of to check that port leading to the oil pan is clear is to hook a hose to it and blow bubbles.

I can check it, but not for a few weeks. I would dive into it quickly if someone had these issues and knew why. We have another baby on the way in a few weeks, priorities are tough right now.

I seem to recall there was some misleading diagrams as what hose goes to what port on the box.

agreed. I'd love to have a known correct diagram. Especially before I get back in there.

[scot850]

I also had a problem with the dipstick blowing out even with a new PCV system. The issue was only the dried out 'o' rings on the dipstick. The 'o' rings are not listed if I recall, but the ones from a P2 are the same if I recall. Once replaced the panic stopped.

Neil.

[Dan McBoost]

I also had a problem with the dipstick blowing out even with a new PCV system. The issue was only the dried out 'o' rings on the dipstick. The 'o' rings are not listed if I recall, but the ones from a P2 are the same if I recall. Once replaced the panic stopped.

Neil.

The kit did come with a new one. I left the old one on (still OK) and could also fit another, so I put the new one below it so they were tight against each other.

Why would a "leak" at the bottom cause pressure at the dip stick? Sorry, i'm sure I am confused as my brain is on fire with so much stuff to do before baby #2.

** also, the "whistle" noise goes away if you jab the throttle, but then comes back.

[abscate]

Probably the brake booster hose - thats the one with major vacuum on it. When you jab the throttle the manifold vacuum drops (rises in pressure) which is stopping the squealing sucking sound.

IF you really have your act together take a pic of your vacuum hose diagram and send to me our post...My 1999 had the 1998 vacuum hose diagram under hood, so yours might not be right either. I think your R and my T5 are similar, though.

Baby #2 is just like Baby #1, don't sweat it...

until you find out they are a different species, but you don't need to know that right now

[scot850]

Your dipstick (not trying to get personal here!) does it have one or 2 'O' rings? The single 'O' ring versions were superseded by the twin version as some folks were having that problem of the dipstick lifting. Had that on our 98 V70XC.

Baby #2, congratulations! 2 is way easier than #1.

Also check the turbo hoses are not split anywhere and are fully seated. The plastic air-box to turbo pipe does and can split with age and can be tricky to re-fit. The short hose from the turbo to the first section of metal pipe that runs over the engine can also be hard to re-tighten. Check the other hoses for splits and cracks. Again disturbing them during repairs can have issues with old rubber hoses. Abscate has a very good point with the brake booster hose.

Neil.

[TripleEight]

I just had a problem where I had so much pressure in the engine just by cranking it for a couple seconds, it will actually blow up with white smoke everywhere, dipstick shot out and oil everywhere bursting out of the oil fill cap. The dipstick hole and oil filler hole literally blew smoke like a steam engine.

I did the PCV system replacement kit with genuine volvo parts and hoses but it didn't fix the problem, only after I replaced the new OEM 3/8" return tube that i just installed(the plastic pipe from PCV oil trap box to the intake) with a 5/8" heater hose, it fixed iteself.

Maybe that might be the problem.

Heres the link to the mod, https://www.matthewsvolvosite.com/forums ... =1&t=53448

Autozone sells the 5/8" heater hose by the foot and they are dirt cheap.