Posted by blinwmiaol.com on March 17, 2009 at 18:04:29 from (71.193.105.247):
In Reply to: Re: ventilator pump posted by Two Banger on March 17, 2009 at 14:09:58:
Well, I am guessing from you handle that you are talking about a Deere 2 cylinder. They used a couple different systems. The explanation I had gotten for how the system works is exactly opposite of how GTX explained it. The crankcase is not a positive ventilated system. The breather vent with the horse hair filter is an intake for fresh air which as it passes thru the crankcase removes all the bad gases and fumes as it is sucked to the ventilation pump. The pump then forces the bad gases thru the little line and into the air filter casting to be run thru the engine again. That is a different system than the 60 and 70 use with the crankcase vent that come right out of the tappet cover. Part of the reason I don't believe the system works the way GTX explained it is if the pump forced air thru the crankcase and out the upright vent by the pulley, it would not need the filter inside it. The 60 and 70 and all the 1010-5020 just had vent tubes with no filter in them. But because the A, B and G sucked air in thru the vent, it had to go thru the horse hair filter to be cleaned. This works until the engine develops enough wear that the blowby overwelms the sytem and then there is a positive crankcase pressure and gases then comeout the upright breather vent as well as go thru the pump and line into the intake.
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