1994 Volvo 850 Turbo PCV Replacement

[jblackburn]

Congrats! Now...does it all start back up and run? I screwed up the intake manifold gasket (and also blew off a turbo hose) my first time. Whoops.

a bolt was missing that attaches the oil box to the block.

Lol, mine's still missing to this day. That bolt is a pain to get to.

The oil in your intercooler hoses to the throttle body is:
1) Normal. Small amounts of oil will always be in these intake hoses.
2) A result of a clogged PCV system not collecting oil.

[ManManOhMan]

Thank you!!!! Thank goodness that's normal!!!!

How did you know I didn't start it, lol? I came back in to wash up, post this, and take a ride!!!! I hope everything went well! How did you blow off a turbo hose?

[ManManOhMan]

Also I wanted to say as far as the 12mm bolts to the bottom of the intake manifold, the one that secures the dipstick into place was in but it seemed that there was a lot of strain on that one bolt. It makes me think that may have played a big part to my oil leak.

I was leaking a significant amount of oil out of my dipstick from the top (from what I saw when I was trying to locate the leak). When I removed that bolt it seemed that the stick wasn't seated into the oil pan properly. Either way it goes I replaced the o-ring!

[jblackburn]

Also I wanted to say as far as the 12mm bolts to the bottom of the intake manifold, the one that secures the dipstick into place was in but it seemed that there was a lot of strain on that one bolt. It makes me think that may have played a big part to my oil leak.

I was leaking a significant amount of oil out of my dipstick from the top (from what I saw when I was trying to locate the leak). When I removed that bolt it seemed that the stick wasn't seated into the oil pan properly. Either way it goes I replaced the o-ring!

That would do it. At the wrong angle or slightly out of place, that would definitely leak a lot, especially with the oil trap clogged up and motor under boost.

For the most part, the 7 10mm bolts hold up the intake, but I'm sure the 1 support bracket 12 mm bolt probably helps a good bit too.

How did you blow off a turbo hose?

Didn't tighten the clamps on the one at the back enough and wooooshhh...POOF!!! /stall.

[ManManOhMan]

Lol, I just literally visualized that!!! My stomach would drop!!!

You're totally correct as far as having to lay down on top of the engine to get to that turbo hose clamp for the PTC nipple! That was the only way I could get to it!

[ManManOhMan]

To All,

I still have significant blow by and oil coming out of the tip of the dipstick and smoke coming out of the tail pipe!

What should be my next step?

I definitely say the turbo is more responsive x 10!

[jblackburn]

Hmm. Is that skinny metal tube still in the system? It is best just to take it out and bypass the whole thing with some vacuum hose.

Bottom ports were completely clear?

[ManManOhMan]

Are you referring to this

This is how the ports looked

[ManManOhMan]

How do I bypass this?

[jblackburn]

Alright, hmm.

For instance, where the hose goes to the side of the intake manifold. Mine went to the bottom of the fuel rail!

I'm wondering if you've got some vacuum lines mixed up per your other thread. Not having vacuum at the right places could be causing the PCV system to back up.


Rather, that vacuum hose in the PCV system goes from your turbo directly to the vacuum tree.

These vacuum diagrams are hard to decipher. When I have access to my computer with Photoshop this weekend, I'll sit down and trace some of the lines in color. The yellow one from the EGR valve goes to the valve at the front of the car, and a white line from there also goes to the vacuum tree.

Then, the line from the fuel pressure regulator (under the injector rail) also goes directly back to the vacuum tree.

If your 1994 does not have a hose to the side of the intake manifold, that hose does not go to the EGR valve on the fuel rail.