Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: feeutfo on 22 November 2009, 17:31:40
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not happy, :( just finished cam cover gaskets. While it was all apart took a peak down the inlet on all pots, all looked ok except pot 6, burnt oil on the valve back and what looks like a spray on the port wall in the forground of the pic. Valve stem seal gone i take it...????
lower pick is just for comparisson on pot 2, all other pots looked as this, who knows what the exhaust valves look like.
Checked plugs while i was there and all have a nice light tan colour including pot 6 which looked exactly the same as the other plugs.
I have noticed the car is using more oil since lpg was installed, coincedence? now expecting pre cat code on that bank although i've been expecting that for a while.... ;D
(http://i344.photobucket.com/albums/p326/chrisgixer/22112009029.jpg)
(http://i344.photobucket.com/albums/p326/chrisgixer/22112009030.jpg)
(http://i344.photobucket.com/albums/p326/chrisgixer/21112009020.jpg)
Question is whats involved with changeing valve stem seals, assuming thats the problem ::)
Just wish i had looked down the inlet before i pulled the cam covers off, all got to be done again now to sort this out >:(
cheers
Chris :)
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Apart from removing cylinders heads :-? it can be done in situ if you can find a way of compressing the valve springs so you can remove the collets. If you feed cord into the bores with the piston down & then carefully lift the piston, that will stop the valve from falling into the cylinder when the collets are removed. I'm not sure what is available for the V6 to be able to compress the spring in a controlled manner. Specific tools are available for some engine types for valve stem seals to be done when the heads are still in place.
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top end head re-build for valve seals is it not? :'( :(
If LPG was havving an affect on them, would it not bugger them all? :-/
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LPG won't affect the stem seals
How much oil are we talking? Might be best to leave it be, if it's minimal :y
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2 marks on the dipper in the last month.....so whats that?.....point 4 of a litre???
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Chris,
Firstly check for blue smoke when started in the morning
Secondly (warm engine) check for blue smoke with a hard rev, after 5 minutes idling
Let us know the results
Just seen, yours is a 3.2, so may have the dodgey seals in
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2 marks on the dipper in the last month.....so whats that?.....point 4 of a litre???
Have you been booting it more since going to LPG?
If i keep my 2.2 sub 85mph on the motorway, it uses no oil what so ever. Cruise at 90+ and it starts using the amounts you describe.
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2 marks on the dipper in the last month.....so whats that?.....point 4 of a litre???
Have you been booting it more since going to LPG?
If i keep my 2.2 sub 85mph on the motorway, it uses no oil what so ever. Cruise at 90+ and it starts using the amounts you describe.
no, the opposite in fact, i try to keep it to 80 these days, trying to get more miles per tank ::) used to regularly top the t** as i work shifts. Empty ish roads at 5am.
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Chris,
Firstly check for blue smoke when started in the morning
Secondly (warm engine) check for blue smoke with a hard rev, after 5 minutes idling
Let us know the results
Just seen, yours is a 3.2, so may have the dodgey seals in
re dodgy seals, iirc my car is after the dodgy batch. 52 plate 03 car
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just to add, i checked the inlet ports in the exact same manor when i fitted the lpg, so no issue in April.
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just to add, i checked the inlet ports in the exact same manor when i fitted the lpg, so no issue in April.
It seems odd to me that the stain appears higher up the inlet port than the valve :-/ the oil deposits on the back of the valve look convincing though....
Is no 6 the first injector after the evaporator? Is there any way that oil / grease from the tank (or contamination in the LPG) could be causing it?
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How were the breathers?
To be honest, that looks like bugger all!
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How were the breathers?
To be honest, that looks like bugger all!
...tfft. ;D :y
breathers where not blocked, some white brown mayo in the eco tec bit, breather pipes to breather box where mint, brass bit with hole in was perfecty clean, still brass coloured
OH yes, some oil running out of the throttlle body, black platic inlet tubes had oil in them....
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How were the breathers?
To be honest, that looks like bugger all!
...tfft. ;D :y
breathers where not blocked, some white brown mayo in the eco tec bit, breather pipes to breather box where mint, brass bit with hole in was perfecty clean, still brass coloured
OH yes, some oil running out of the throttlle body, black platic inlet tubes had oil in them....
Did you poke anything into the brass hole?
It sounds a bit like the small drilling is a bit blocked
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How were the breathers?
To be honest, that looks like bugger all!
...tfft. ;D :y
breathers where not blocked, some white brown mayo in the eco tec bit, breather pipes to breather box where mint, brass bit with hole in was perfecty clean, still brass coloured
OH yes, some oil running out of the throttlle body, black platic inlet tubes had oil in them....
Did you poke anything into the brass hole?
It sounds a bit like the small drilling is a bit blocked
Yep, paper clip, all the way in, seemed clear.
I did think about taking the breather box off, but the clearnes, weather, access, and the fact i could see grey goo up the sides of the box itself made me think better of it.
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would the breathers only affect one valve though?
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would the breathers only affect one valve though?
OIC where Mark is going with this one. Increased pressure in crankcase and cam covers forcing oil past the stem seals.
Presumably the weakest link will fail first (ie No6 stem seal in your case) but if you can reduce the pressure you can reduce the leak without having to replace it.
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would the breathers only affect one valve though?
OIC where Mark is going with this one. Increased pressure in crankcase and cam covers forcing oil past the stem seals.
Presumably the weakest link will fail first (ie No6 stem seal in your case) but if you can reduce the pressure you can reduce the leak without having to replace it.
Woo. Never thought of it that way! Trouble is breathers def not blockled. Unless there is a problem in the breather box itself?
I put the cam cover seal failure down to age. The o rings where hard and didnt recover their shape when removed. Seals where better but not by much.
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would the breathers only affect one valve though?
OIC where Mark is going with this one. Increased pressure in crankcase and cam covers forcing oil past the stem seals.
Presumably the weakest link will fail first (ie No6 stem seal in your case) but if you can reduce the pressure you can reduce the leak without having to replace it.
Correct :y
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There was more sh1te than that in my intakes when I LPG'd mine. Don't remember seeing any residue on the back of the valves though.
I check the breather box is clear by attaching a long piece of pipe to each hose barb and checking I can blow down it OK.
Oil level on mine has never moved between services, before and after LPG. Driving style and speed varies with mood. ::)
The difference could well be explained by a slightly duff petrol injector spray pattern on that pot giving less washing of the walls, IMHO.
I don't think I'd worry about it until oil consumption / visible smoke became a pain, TBH. Worth double checking breather system though.
Kevin
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just wonder if the petrol injector is still seated correctly after the lpg install. Plenty of extra gubbins in there to push it off line, or i haven't done my job properly rebuilding after the install and drilling the manifold?
I'll have a poke about when i re check the breathers. I'm fairly certain they are fine though.
Thanks guys.
Special mention to Andy H. :y
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Special mention to Andy H. :y
It wasn't me! I didn't touch it :D
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Special mention to Andy H. :y
It wasn't me! I didn't touch it :D
;D yeah, i saw ya ;D