Engine 850: B5204S/2.0/20v: - Potential PCV problems

Moose850 · Aug 31st, 2019, 14:12

I have the 2.0 Litre 20 valve. I have heard some engines have PCV problems. What should I look at, check or keep an eye out for, regards this?

SteveSarre · Sep 2nd, 2019, 08:30

Hi

With the engine running, if you take the dipstick out, does it puff smoke (bad) or does it gently suck in (good)?

You can test by fixing a rubber glove over the tube and see what happens.

Hope that helps,
Steve

volvo again · Sep 2nd, 2019, 08:50

What mileage has it done?
As Steve says, check for fumes from dipstick, have a check of pcv hoses to see if they are hard / brittle, not sure if your engine has a flame trap, if it has then clean / replace it.
Eventually the oil trap / hoses will need replacement, not a hard job to diy but intake manifold has to come off.
Regular oil changes...with good quality oil recommended.

Moose850 · Sep 2nd, 2019, 22:38

Quote:

Originally Posted by SteveSarre

Hi

With the engine running, if you take the dipstick out, does it puff smoke (bad) or does it gently suck in (good)?

You can test by fixing a rubber glove over the tube and see what happens.

Hope that helps,
Steve

I'll check tomorrow. Thanks.

Moose850 · Sep 2nd, 2019, 22:43

Quote:

Originally Posted by volvo again

What mileage has it done?
As Steve says, check for fumes from dipstick, have a check of pcv hoses to see if they are hard / brittle, not sure if your engine has a flame trap, if it has then clean / replace it.
Eventually the oil trap / hoses will need replacement, not a hard job to diy but intake manifold has to come off.
Regular oil changes...with good quality oil recommended.

It has done 250,000 miles.

Thanks for the info. I will look to see of there is a flame trap and check hoses.

Always change oil every 4k to 5k miles. Fit genuine volvo oil filter and Shell Helix 10/40 semi synthetic.

Moose850 · Sep 3rd, 2019, 12:41

Done the test. Small hose near cam cover at front is quite hard but there is suction when I put rubber glove over oil filler and dipstick tube.

Aug 31st, 2019, 14:12	#1
Moose850 Member Last Online: Sep 17th, 2020 14:17 Join Date: Apr 2010 Location: Norfolk, England.	Potential PCV problems I have the 2.0 Litre 20 valve. I have heard some engines have PCV problems. What should I look at, check or keep an eye out for, regards this? __________________ *The Power of the Moose* 850 2.0L 20 valve 2WD Estate 1996. MK1 Escort Twin Cam 1969.

Sep 2nd, 2019, 08:30	#2
SteveSarre Premier Member Last Online: Yesterday 15:16 Join Date: Oct 2004 Location: London/West Country	Hi With the engine running, if you take the dipstick out, does it puff smoke (bad) or does it gently suck in (good)? You can test by fixing a rubber glove over the tube and see what happens. Hope that helps, Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Sep 3rd, 2019, 12:41	#6
Moose850 Member Last Online: Sep 17th, 2020 14:17 Join Date: Apr 2010 Location: Norfolk, England.	Done the test. Small hose near cam cover at front is quite hard but there is suction when I put rubber glove over oil filler and dipstick tube. __________________ *The Power of the Moose* 850 2.0L 20 valve 2WD Estate 1996. MK1 Escort Twin Cam 1969.

Sep 2nd, 2019, 08:50	#3
volvo again Master Member Last Online: Today 11:03 Join Date: Jun 2018 Location: Presteigne, mid Wales	What mileage has it done? As Steve says, check for fumes from dipstick, have a check of pcv hoses to see if they are hard / brittle, not sure if your engine has a flame trap, if it has then clean / replace it. Eventually the oil trap / hoses will need replacement, not a hard job to diy but intake manifold has to come off. Regular oil changes...with good quality oil recommended.

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