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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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03-12-2021, 08:19 AM | #11 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: G1 lack of crankcase pressure
I think the OP bailed
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03-21-2021, 10:36 PM | #12 |
Not Yet Wild
Join Date: Dec 2020
Posts: 3
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Re: G1 lack of crankcase pressure
we are taught in the program to do some basic diagnostics on all equipment that comes in. Compression, leakdown test to see if the valves are seating properly, spark test to see if we have spark and a crankcase pressure and vacuum test to test on 2 strokes to test the crankcase seals. The crankcase has to seal. When the piston in a two-stroke comes down it compresses the air/fuel charge in the crankcase and pushes it, through the ports in the sides of the cylinder, into the combustion chamber. As the piston rises a vacuum is created under the piston. That vacuum sucks the air/fuel mixture through the carburetor and into the crankcase. We will usually use about 6-15 lbs of pressure and 5-7 inches of Mercury vacuum. I usually stay about 5-8 lbs of pressure to avoid blowing out the seals. It happened once and now I am a little wary of to much pressure. Any leaks of pressure or vacuum then it will effect the starting or running of the motor. We find the leaks by spraying areas with soap and water to see if it bubbles. We perform the test to see if the motor is even worth fixing or at least to help trouble shoot problems.
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03-22-2021, 02:18 PM | #13 | ||
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: G1 lack of crankcase pressure
Quote:
Now the questions (as stated in other replies): If you already know all that, why do you not have any pressure in the crankcase? Did you check the seals yet? If the engine runs good, how can it not have any pressure? I still say this. Either your error is in your method or your equipment. Something is missing here. And I'm still trying to figure out why you are coming to a golf cart forum to figure out your issue, when you don't have an issue (engine is running good), and you have a mechanic/instructor at your disposal. Here is my reply from weeks ago 3/25/21 that you never responded to: Quote:
Good luck with your project. I hope you get it figured out. |
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06-18-2021, 05:20 AM | #14 |
Not Yet Wild
Join Date: Mar 2008
Location: Horsey country in Mich.
Posts: 48
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Re: G1 lack of crankcase pressure
Ccp is net zero
+ pressure = - pressure while running |
06-29-2021, 05:56 AM | #15 |
Not Yet Wild
Join Date: Mar 2008
Location: Horsey country in Mich.
Posts: 48
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Re: G1 lack of crankcase pressure
ccp is about 1.2-1.4/1 or 1.2-1.4 x inlet pressure(about 1.2-1.4x ambient pressure) i.e.14.7x1.2=17.6psi
ccvac is about 80% of that |
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