V70 II T5 Inlet Manifold Removal

V70IIT5 · Post by **V70IIT5** » 05 Feb 2017, 10:37

Well I got the throttle and banjo off without removing the alternator and PS pump. I think the oil catch tank must be blocked internally. The two oil holes on the block had some crud in them but weren't as bad as I imagined given the amount of oil getting around the induction system. Some mayonnaise in the catch tank but just on the drain port although no evidence of headgasket failure or anything. I am wondering about doing a compression test before reassembly to gauge the condition of the piston rings and cylinder scoring. If compression is a bit low then I might put a larger bore tube from the oil catch tank top to the PCV valve. Howard's Volvo Pages seem to indicate this is a good idea. The car, although in excellent interior and exterior condition when I bought it recently at 103k miles just had 2L oil left in the sump. I figure a bit more blow by than spec is probably likely.

Has anyone used Lucas Oil Stabilizer in a T5 engine? It seems to work well on worn bores/rings.

Post by **abscate** » 05 Feb 2017, 17:06

Put a hose onto that lower port hole and see if it blows clear. I would stay stock on the P2 crankcase vent..it doesn't plug as badly as the P80s

V70IIT5 · Post by **V70IIT5** » 06 Feb 2017, 00:33

Here's a couple of photos of the top and bottom oil holes in the block as they were. I will do the tube blow check as you said although if it was blocked I would have expected the hole to be blocked and oil and crud to have run out in quantity when I removed the oil catch tank. Surely oil would have been collecting.......

Post by **precopster** » 06 Feb 2017, 01:30

Volvos don't run a particularly clean set of inter cooler hoses.
Oil crud is pretty much coating the hoses and inter cooler even when they're running great. The XC9Os and post 2002 V70s and S60s have a much larger catch tank but it still doesn't stop the oil from collecting and blocking the PTC.

Post by **abscate** » 06 Feb 2017, 04:15

That's not too bad. Get the hose on it, I bet it's open.

Run synthetic and that will clean up nicely.

V70IIT5 · Post by **V70IIT5** » 06 Feb 2017, 05:00

OK thanks, I am about to try and get it all back together. Why should I keep the stock hose to the PCV valve and not fit a larger pipe as per elsewhere on the website recommended? Obviously it wouldn't be heated. Unless the PCV valve opening is widened if this is possible then the same diameter restrictions apply at these points don't they?

Please would anyone have the cylinder compression data? Cheers

Post by **chrism** » 06 Feb 2017, 07:37

Those ports into your engine block really aren't all that bad. Both of my cars were a bit more blocked right at the port lip, especially the lower one at about 50%. But once I pulled out the main "clob" I was able to blow air quite freely into each of them and out the oil filler on top of the engine.

Refresh my memory - where is the PCV valve on the turbos? I don't recall. Thanks.

V70IIT5 · Post by **V70IIT5** » 06 Feb 2017, 11:27

The valve is at the back right of the engine, near the turbo. Then theres the little feed for idle into the manifold. I can't work out what the PCV valve consists of. It has an electrical connector on it so it obviously tests for pressure one way I would think. Presumably its a one way valve? Perhaps not though as internet coverage shows them been cleaned through...

Post by **precopster** » 06 Feb 2017, 14:44

It's called a PTC and it's just a heated element to try and turn the crud into a liquid. Not Volvo's best design and dates back from early 90s.

Post by **chrism** » 06 Feb 2017, 15:12

Ah-ha, so that little gizmo I knew about. Thanks.

V70 II T5 Inlet Manifold Removal

Re: V70 II T5 Inlet Manifold Removal