Anonymous-0
Well-known Member
almost all tractors have the crankcase vented to the dirty atmosphere. This is likely the number one cause of engine wear. The vent should be filtered in all cases.
- Thread starter Anonymous-0
- Start date
That sure came out of nowhere!
What'cha smok'in?
That being said, while a filter is certainly a good idea, if there is no PCV (connection to the intake manifold) a simple "road draft tube" or "drop tube" ain't gonna let ANY dirt in the engine 'cause the dirt ain't gonna travel upwards, against the flow of blowby going DOWNWARDS.
What'cha smok'in?
That being said, while a filter is certainly a good idea, if there is no PCV (connection to the intake manifold) a simple "road draft tube" or "drop tube" ain't gonna let ANY dirt in the engine 'cause the dirt ain't gonna travel upwards, against the flow of blowby going DOWNWARDS.
rustyfarmall
Well-known Member
I'll certainly sleep more soundly tonight with that timeless bit of knowledge tucked away safely in my memory.
buickanddeere
Well-known Member
Single vent, no.
Only time that would apply if there is a 2nd vent connected to the engine's intake manifold/ports.
My JD 70D uses the starting engine airfilter to clean any air drawn into the crankcase.
If concerned, run that vent you see gases coming OUT of. Into the intake system somewhere. Down stream of a paper airfilter if so equiped.
Only time that would apply if there is a 2nd vent connected to the engine's intake manifold/ports.
My JD 70D uses the starting engine airfilter to clean any air drawn into the crankcase.
If concerned, run that vent you see gases coming OUT of. Into the intake system somewhere. Down stream of a paper airfilter if so equiped.
Ultradog MN
Well-known Member
- Location
- Twin Cities
Most of the old junk I own have so much blow by that there's little chance of one ever sucking any air in.
Anonymous-0
Well-known Member
And the answers are;
A. true
B. false
C. sometimes
D. all of the above
I'll pick B. I don't think engine manufacturers would want a bad reputation for allowing dirt to wear their engines out prematurely. Dave
A. true
B. false
C. sometimes
D. all of the above
I'll pick B. I don't think engine manufacturers would want a bad reputation for allowing dirt to wear their engines out prematurely. Dave
MarkB_MI
Well-known Member
- Location
- Motown USA
Is this a troll?
Assuming you refer to engines that do not have positive crankcase ventilation, I've never seen a crankcase vent that sucked air. The engine sucks a few hundred cubic inches of air through the intake manifold every minute; it doesn't take much of an air filter leak to allow a lot of dirt in the engine. I'd speculate that more dirt gets in the average engine during routine maintenance than through the crankcase vent.
Assuming you refer to engines that do not have positive crankcase ventilation, I've never seen a crankcase vent that sucked air. The engine sucks a few hundred cubic inches of air through the intake manifold every minute; it doesn't take much of an air filter leak to allow a lot of dirt in the engine. I'd speculate that more dirt gets in the average engine during routine maintenance than through the crankcase vent.
Bus Driver
Well-known Member
The responses below are a bit surprising. Yes, an engine can pull air into the crankcase through the vent. Take the case of a single cylinder engine. The piston moving in the cylinder changes the air volume of the crankcase by exactly the same amount as the change within the combustion side of the piston. As the piston comes down, air is pushed out of the crankcase, as the piston rises, air is drawn into the crankcase. Positive crankcase ventilation may well result in a steady inflow of air into the crankcase. Yes, keep the crankcase vent and air passing through it as clean as possible.
Brian G. NY
Well-known Member
Well, Bus Driver, yours was a sensible answer to a no way dumb question. Probably most of the guys on here own older tractors without PCV so that little crankcase breather does bear to have some regular attention. There definitely is some movement of air both in and out of the crankcase/valve cover areas thru the crankcase breather. That breather is a filter of sorts and on my A-Cs the manual says: "Wash in gasoline and dip in motor oil - throw off excess oil before replacing. Under extremely dusty conditions, service breather cap twice daily."
Sounds to me like A-C takes this rather seriously!
I can only conclude from some of the answers, the responders were thinking that only dirt entering the compression chamber is harmful and not considering that dirt in the crankcase/valve cover area can be a significant cause of wear as well. I"m sure at least some will take something good away from your post.
Sounds to me like A-C takes this rather seriously!
I can only conclude from some of the answers, the responders were thinking that only dirt entering the compression chamber is harmful and not considering that dirt in the crankcase/valve cover area can be a significant cause of wear as well. I"m sure at least some will take something good away from your post.
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