04 v70, oil leak+no vac at dipstick Topic is solved

[22volvo]

So the oil leak is getting worse. Appears to be coming from the front crankshaft seal and or Cam seals.
I put a vacuum gauge on the oil dipstick hole and there was no vacuum or pressure, idle to 3k rpm.
In addition recently got the code that says the EVAP vacuum pump behind the muffler needs to be replaced.

Had the flame trap and hoses replaced 4 years ago. Regular good oil changes with synthetic.

What I would like to know is where does a 2.5t turbo engine get its vacuum for the PCV system. It looks like the center tap on the intake, and the engine dies if I disconnect that so vacuum is good there. I've ordered some 8mm silicone vacuum line and I'm going to diagnose why there's no vacuum on the crankcase as I'm replacing it.

At 280k miles, the data points above look like a vacuum issue not an oil seal issue.

[scot850]

Depending how bad the cam seals or crank seal are pushed out, you may not be getting a true vacuum picture here. I have had a few friends recently that seem to be suffering cam seal ejecting themselves although the PCV system has no obvious pressure issues.

Neil.

[jonesg]

So the oil leak is getting worse. Appears to be coming from the front crankshaft seal and or Cam seals.
I put a vacuum gauge on the oil dipstick hole and there was no vacuum or pressure, idle to 3k rpm.
In addition recently got the code that says the EVAP vacuum pump behind the muffler needs to be replaced.

Had the flame trap and hoses replaced 4 years ago. Regular good oil changes with synthetic.

What I would like to know is where does a 2.5t turbo engine get its vacuum for the PCV system. It looks like the center tap on the intake, and the engine dies if I disconnect that so vacuum is good there. I've ordered some 8mm silicone vacuum line and I'm going to diagnose why there's no vacuum on the crankcase as I'm replacing it.

At 280k miles, the data points above look like a vacuum issue not an oil seal issue.

I would smoke test it and find the leaks, a homemade smoker as on youtube should do it.
Vida might be able to test the vac pump, I don't know but if its able to set a code then the ECM should be able to control or read it.

[ignatz]

Check the cam seals. Also your vacuum guage probably can't read accurately enough at the dip stick. I use a Dwyer mechanical guage that reads from 0 to 2 inches of water column. 1 inch of water column is .0289 Hg. Since our series Volvos idle at negative .25 to 1.5 inches of water column, I doubt your guage can be of any help. Check the cam seals.
PS. I have the guage flipped around to read negative pressures.

[22volvo]

Thanks.
Agree on my mighty vac not being sensitive enough.
Just read the excellent right up by cn90 on cam seal replacement. At 280k Miles I'm ordering the parts for front & rear seals, hubs and TB.

[vtl]

At 280k miles it needs new piston rings.

[jonesg]

uh yeh, might be wise to do a compression test to get an idea before throwing money which might not solve anything.

[vtl]

uh yeh, might be wise to do a compression test to get an idea before throwing money which might not solve anything.

It will only misguide, as it gives no good estimation of how much blow-by gases will be there down the sump when the engine is under full load.

OP, do a proper PCV glove test: latex glove over oil filler neck (may need to fix it with rubber band), it should deflate. Then ask somebody to record the glove, jump into car, step on brakes, transmission in Drive, gently rise engine revs to 2500 RPMs for couple of seconds. This will build boost and force PCV to switch its source of vacuum to PTC nipple.

Make sure PCV banjo bolt is 31325709: https://www.fcpeuro.com/products/volvo- ... vo-8653884 There were a few revisions of it, you want that one. Also it's a wear item, has to be replaced once in a while. Mine wasn't sealing properly only after a few years of use, thanks to deformation and sludge buildup.

PTC is a common source of vacuum leak, in a system that is already starved of vacuum. Smoke the intake up and fix all holes you notice.



Here on the video the glove is agitated by the intake camshaft's third cylinder lobe that sits directly underneath the filler neck and throws oil droplets and creates air vortexes all around. But you want to see something like that.

[22volvo]

Got all the parts to do seals and exhaust hub.
So I got the front sprockets aligned pulled the rear cam position caps so I can install the tool between the camshafts and the slots are sitting eight o'clock to 2:00 instead of 9:00 to 3:00.

Sprocket aligned. Exhaust not shown but identical.

Expected slots to be horizontal.

Previous owner had at least one timing belt done but don't know the shop or what other work they did. Since purchasing the car (2010) I've done two timing belts by aligning the sprockets and then replacing the belt/wp/tensioner.

I wanted to lock the camshafts before I pulled the crankshaft pulley but it looks like I need to pull the crankshaft pulley to see where it's timing marks are, since it's indexed, before I proceed. I'm not removing the belt until I understand what's going on.
Any help would the appreciated.
Thanks.

[vtl]

Don't need to remove anything. Use a good pointed flashlight. First picture from the internet:

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