RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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i know its due to oil burning, but at a loss as to how.
piston rings are new
compression is good
now on 2nd set of valve stem seals and 2nd set of exhaust valves
breathers are free (not blocked)
idle is smooth, revs pick up smoothly, ignoring the plumes of smoke out the exhaust the engine runs really well
HELP 
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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is it a new exhaust? often if the exhaust is old and have been filled with oil from another engine problem it takes ages for the oil to burn out hte fiberglass baffels
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Cossie
Member
Registered: 17th May 02
User status: Offline
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check oil level weekly and see if its get low !
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ainsley_brader
Member
Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
User status: Offline
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have you driven it with this new engine in yet?
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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no. its not gone above 3k rpm yet
cant map it as it smokes to much
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ainsley_brader
Member
Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
User status: Offline
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as said if it has smoke in the exhaust it will take a good drive to clear it through.
Does it smoke on idle or only when revved?
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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smokes all the time, the full exhaust system is either new or less than 6 months old
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ainsley_brader
Member
Registered: 24th Mar 02
Location: Tattershall, Lincolnshire
User status: Offline
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when you had the engine apart recently did you find anything wrong with it?
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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just driven it home. runs spot on but smokes. pulls well etc
when we had the engine apart the only problem we could find was with the exhaust valves, which were replaced along with the stem seals.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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IS THE SMOKE GETTING LESS? IS IT CLOUDS OF SMOKE.? oops caps
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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i cant tell to be honest, its not REALLY REALLY bad, just when pulling off theres a big puff, cant see that much when im driving along
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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used much? may be oil in the exhaust from the valve stem problem that needs to burn off?
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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thats what i thought, or maybe shitty petrol?
i plan on going to work in it tomoro, so will see how it goes then
when we first started it up today it didnt smoke until i actually drove it though
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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my engine smoked on acceleration and coast-down after being rebuilt. I ran it for 500 miles with 3 oil changes and it eventually cleared.
what did you do to the bores during the re-build?
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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Rob, get some pics/vids if you can, its difficult to guestimate without knowing how bad the smoke is 
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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mine never smoked after a rebuild lol, am i lucky, and it had shite fuel in it
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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the bores were machined to suit my 0.5mm oversize pistons, and then honed etc etc
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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did you use bigger oil control rings as well as compression rings? probably did but easily overlooked.
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Jules
Member
Registered: 26th Nov 04
Location: Ipswich, Suffolk Status: Happy
User status: Offline
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When you changed the valves did you grind them in or just replace them?
If they weren't ground in then they will take a while to form their own "seals"
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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the new valves all have triple angle seats on them, lapped into their respective ports on the head.
the rings i used came as 4 sets of 3 rings, so i'd hope they were the same size
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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piston ring gaps set 120 degrees?
timing ok?
are the compression rings tapered ones? if so they could have been fitted upside down?
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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yes
yes
put them in the way the haynes said to, cant remember off the top of my head
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Dave A
USER UNDER INVESTIGATION - DO NOT TRADE
Registered: 10th Dec 03
Location: County Durham
User status: Offline
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tapered and stepped rings are different. check which ones you have.
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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from what i remember they were tapered, as i recall checking the haynes as to which way they went
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