V50 General : - 1.8L petrol failed emissions badly - Page 3

MacV50 · Jun 3rd, 2015, 11:21

Quote:

Originally Posted by thecuist

There are definitely issues with the valve stem oil seals. Cloud of blue smoke at startup after sitting overnight, and blue smoke on the overun after going down a hill using engine braking. I have managed to source a new set of rings and a new set of valve stem seals. My plan is to attempt to change the valve seals first without removing the head. Then test emissions again. If the problem remains I'll move onto the oil control rings. That way I can hopefully avoid having to strip down the engine if the valve seals do the job. I'll keep this thread updated with my progress for the benefit of others who may run into similar issues.

Ah, OK. From an earlier post, it sounded like you weren't getting it on the overrun, only when you applied power again.

Hopefully it is just the stem seals. Good luck!

thecuist · Jun 3rd, 2015, 21:20

Managed to change the stem seals on the 2 outside cylinders today. Dont have the specialist tools to lock the timing chain tensioner so just marked up all the various moving parts and undid the 2 chain sprockets and lifted out the Cams. As its an interference engine made sure cylinders 1 and 4 were at TDC and that meant the Valves only dropped 1/2 inch, no need for rope tricks or compressed air to hold the valves shut. No spring compressor so just used a socket and a magnet to remove and catch the collets/keepers. Valve stem seals were pretty bad, I'd say the holes in the rubber seals which go around the valve stem were a good 1 mm bigger than the replacement new ones I bought. Putting the keepers back on was a bit of a mission using just a ring spanner to compress the valve springs but got there in the end.
So then it was a case of reassembling the camshafts and sprockets.(I kept the sprockets in position and the chain tight using a piece of wood between the 2 sprockets).
Had a good deal of trouble getting one of the sprockets back on due to the timing chain tensioner pulling the sprocket slightly of centre but with a bit of careful leverage I managed to persuade it back on.
Then I checked all my timing marks and rotated the engine to get cylinders 2 and 3 to TDC. Took off with the cams and sprockets again, and tomorrow I'll change the remaining 8 stem seals and see how it goes. Fun and games.

MacV50 · Jun 8th, 2015, 17:32

How are you getting on with this?

Hope you get it fixed with seals only

thecuist · Jun 10th, 2015, 15:51

Hi Mac
Changed the seals and now I have no smoke on startup, but still smoking when I bring revs up above about 1500rpm. So Im gonna get my local garage to change the rings. Assuming the Cylinder bores are ok when he has the engine stripped. Leakdown test was very good at only 7 percent so fingers crossed it is the just oil control rings. Apparently they are prone to gumming up on the duratec HE engines.

thecuist · Oct 4th, 2015, 14:18

For the benefit of others who may come across this thread. Changing the rings solved this problem completely. The emissions came down well below the limits required to pass an MOT. So if you have a V50 1.8 petrol which is failing emissions, and changing the plugs doesnt solve the problem. Even with a leakdown test showing perfect compression on every cylinder, its probably the oil control rings causing the issue. I bought replacement rings for about £70 and a new head gasket, plus bolt set for about another £100. Then found a good mechanic who charged me £400 to fit them.

b4mky · Jul 8th, 2020, 19:23

.... JUST BRILLIANT, did the same on mine, now perfect, Thanks

thecuist · Jul 9th, 2020, 17:27

Thanks for the thanks. That Volvo is now long gone, but glad to see its still useful info for the forum. Once I get around to restoring my 850r. Im sure I'll be back on here frequently.

alcashj94 · Oct 3rd, 2020, 22:12

Quote:

Originally Posted by b4mky

.... JUST BRILLIANT, did the same on mine, now perfect, Thanks

Looks like I have to change the rings on mine, already done the valve stem seals and changed the PCV valve but still drinking oil and smoking on occasions.
Any pointers on any 'awkward' stages to be aware of, access etc. and roughly how much time should I allow myself to get the job done?

Oct 4th, 2015, 14:18	#25
thecuist thecuist Last Online: Sep 2nd, 2022 12:19 Join Date: Feb 2007 Location: Castlebar, West of Ireland	Problem solved For the benefit of others who may come across this thread. Changing the rings solved this problem completely. The emissions came down well below the limits required to pass an MOT. So if you have a V50 1.8 petrol which is failing emissions, and changing the plugs doesnt solve the problem. Even with a leakdown test showing perfect compression on every cylinder, its probably the oil control rings causing the issue. I bought replacement rings for about £70 and a new head gasket, plus bolt set for about another £100. Then found a good mechanic who charged me £400 to fit them.

Jul 8th, 2020, 19:23	#26
b4mky New Member Last Online: Mar 9th, 2024 17:11 Join Date: Feb 2008 Location: reigate	Perfect .... JUST BRILLIANT, did the same on mine, now perfect, Thanks

Jul 9th, 2020, 17:27	#27
thecuist thecuist Last Online: Sep 2nd, 2022 12:19 Join Date: Feb 2007 Location: Castlebar, West of Ireland	Happy to help Thanks for the thanks. That Volvo is now long gone, but glad to see its still useful info for the forum. Once I get around to restoring my 850r. Im sure I'll be back on here frequently.

Jun 3rd, 2015, 21:20	#22
thecuist thecuist Last Online: Sep 2nd, 2022 12:19 Join Date: Feb 2007 Location: Castlebar, West of Ireland	Managed to change the stem seals on the 2 outside cylinders today. Dont have the specialist tools to lock the timing chain tensioner so just marked up all the various moving parts and undid the 2 chain sprockets and lifted out the Cams. As its an interference engine made sure cylinders 1 and 4 were at TDC and that meant the Valves only dropped 1/2 inch, no need for rope tricks or compressed air to hold the valves shut. No spring compressor so just used a socket and a magnet to remove and catch the collets/keepers. Valve stem seals were pretty bad, I'd say the holes in the rubber seals which go around the valve stem were a good 1 mm bigger than the replacement new ones I bought. Putting the keepers back on was a bit of a mission using just a ring spanner to compress the valve springs but got there in the end. So then it was a case of reassembling the camshafts and sprockets.(I kept the sprockets in position and the chain tight using a piece of wood between the 2 sprockets). Had a good deal of trouble getting one of the sprockets back on due to the timing chain tensioner pulling the sprocket slightly of centre but with a bit of careful leverage I managed to persuade it back on. Then I checked all my timing marks and rotated the engine to get cylinders 2 and 3 to TDC. Took off with the cams and sprockets again, and tomorrow I'll change the remaining 8 stem seals and see how it goes. Fun and games.

Jun 8th, 2015, 17:32	#23
MacV50 Master Member Last Online: Apr 22nd, 2024 08:52 Join Date: Feb 2012 Location: Aberdeen	How are you getting on with this? Hope you get it fixed with seals only

Jun 10th, 2015, 15:51	#24
thecuist thecuist Last Online: Sep 2nd, 2022 12:19 Join Date: Feb 2007 Location: Castlebar, West of Ireland	Hi Mac Changed the seals and now I have no smoke on startup, but still smoking when I bring revs up above about 1500rpm. So Im gonna get my local garage to change the rings. Assuming the Cylinder bores are ok when he has the engine stripped. Leakdown test was very good at only 7 percent so fingers crossed it is the just oil control rings. Apparently they are prone to gumming up on the duratec HE engines.

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