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+--- Thread: Blow by (/showthread.php?tid=4145)
Blow by - martureo - 12-04-2012
I'm noticing that I've got fumes coming from my oil dipstick tube and blowby from the oil fill cap on the valve cover is worse than it was last year.
OM617.952
~280,000 (unknown if accurate) on engine.
Daily driver, 40 mile commute at 40-55mph.
5w-40 LubroMoly, changed every 5,000 miles.
I'm getting 28mpg on average every tank. Nothing's wrong with the car right now, but I'm just looking to the future.
Is there anything I can do to reduce or correct the blow-by?
RE: Blow by - Simpler=Better - 12-04-2012
A valve adjustment now, and then again in 500 miles.
If you've got plenty of time, new valve seals can help
Put some MMO in the crank case, and see if anything changes in teh next couple thousand miles
RE: Blow by - Greazzer - 12-04-2012
Yup ... valve adjustment X2. I suggest once you get all the bugs worked out, you do it every 6 months. Well worth the $6.00 VC gasket and 45 minutes investment.
RE: Blow by - martureo - 12-04-2012
Valve adjustment was done 1000 miles ago. Just over a month ago.
RE: Blow by - Simpler=Better - 12-04-2012
In that case, run marvel mystery oil in the crank case (I think it's 750ml?) and see if that helps. Definitely made a difference in my truck.
If it runs, and it doesn't burn oil I wouldn't worry too much about it-maybe just do the valve stem seals
RE: Blow by - larsalan - 12-04-2012
(12-04-2012, 10:31 AM)Simpler=Better ...
If it runs, and it doesn't burn oil I wouldn't worry too much about it-
...
I would say use that synthetic oil. Even at a few $ more I swear it has saved me monies. It is way less likely to burn off than the conventional stuff. And then whatever benefits there are for all the moving metal that is the motor are just gravy.
I get that rotella t6 diesel at advanced auto parts. That's the most reasonable deal in my town.
RE: Blow by - martureo - 12-04-2012
(12-04-2012, 02:47 PM)larsalanAs per the OP I am using full synthetic. I ran Mobil 1 5w40 TDT for a year and for the past two have run 5w40 Lubro Moly (a German full synthetic).(12-04-2012, 10:31 AM)Simpler=Better ...
If it runs, and it doesn't burn oil I wouldn't worry too much about it-
...
I would say use that synthetic oil. Even at a few $ more I swear it has saved me monies. It is way less likely to burn off than the conventional stuff. And then whatever benefits there are for all the moving metal that is the motor are just gravy.
I get that rotella t6 diesel at advanced auto parts. That's the most reasonable deal in my town.
RE: Blow by - DeliveryValve - 12-04-2012
If you are running the flat rubber type hose for the crankcase vent, get rid of it and get the original round tube style back in place. That type of hose is a restriction and can cause leaking at the cap and dipstick.
Regarding the motor oil, which Lubro Moly are you running? There are several variations.
.
RE: Blow by - martureo - 12-04-2012
(12-04-2012, 03:31 PM)DeliveryValve If you are running the flat rubber type hose for the crankcase vent, get rid of it and get the original round tube style back in place. That type of hose is a restriction and can cause leaking at the cap and dipstick.I actually went to the flat style because the round style seemed like it leaked more. And I really can't see the flow being restricted much, the cross section is exactly the same.
Regarding the motor oil, which Lubro Moly are you running? There are several variations.
I'm running 5w-40 Synthetic Technology. I used to run the old version which was full synthetic, but nobody sells a full synth Lubro Moly around me anymore. I was thinking about switching to Total Quartz 9000 for a few rounds to see if it's any better.
RE: Blow by - DeliveryValve - 12-04-2012
Cross section doesn't mean much. The best flow is from a round tube.
Blow-by is a product of gasses seeping past the piston rings. When you get an engine that is high in mileage, blow-by will get worst. The flat hose is fine for a healthy engine, but when blow-by is strong, the flat hose inherent flow restriction is exacerbated.
If the round style was leaking, you just need new rubber ends or make a custom job with a 5/8 inch inner diameter tube.
Oilwise, I think there is a possibility the situation may improve with a change in brand. I'm thinking the oil maybe too thin. You can run it longer to see if it improves. 5000 miles is too short an interval for synthetic. I would run it up to 8,000 miles without oil analysis.
Edit: I stated to run it longer because the oil will thicken through use and possibly allow the rings to seal better.
.
RE: Blow by - martureo - 12-04-2012
(12-04-2012, 04:06 PM)DeliveryValve Cross section doesn't mean much. The best flow is from a round tube.Cross section is the major determinant in determining pressure.
Blow-by is a product of gasses seeping past the piston rings. When you get an engine that is high in mileage, blow-by will get worst. The flat hose is fine for a healthy engine, but when blow-by is strong, the flat hose inherent flow restriction is exacerbated.
If the round style was leaking, you just need new rubber ends or make a custom job with a 5/8 inch inner diameter tube.
I personally like that there are only two leak points on the flat hose, as opposed to the four on the circular cross sectioned.
Quote:Oilwise, I think there is a possibility the situation may improve with a change in brand. I'm thinking the oil maybe too thin. You can run it longer to see if it improves. 5000 miles is too short an interval for synthetic. I would run it up to 8,000 miles without oil analysis.I could switch back to 15w-40. 5w-40 is beautiful on winter mornings though.
Edit: I stated to run it longer because the oil will thicken through use and possibly allow the rings to seal better.
RE: Blow by - Captain America - 12-07-2012
RUN IT HARD aka give her the Italian tune up. I got a car with a good engine but unknown miles. LOTS of blowby. the valve cover cap was jumping off the valve cover at idle. I ran the piss out of it: 16lbs boost and speeds in excess of 85mph on the freeway (Profile pic) and it all virtually disappeared.
http://youtu.be/LPP2P9NcIkM