Testing bleed line check valves located at bearings

[hkeiner]

I tested the six bleed line check valves that push oil towards the cylinders and found them to be OK. I used a short piece of hose and a syringe to test for one-way flow. I did this test to see if they might be a cause for poor idle or excess smoking during idle. Apparently not. These check valves were easy to access and test.

The check valves located at the lower and upper bearings are not so easy to access without removing the carbs and other stuff that are in the way. Before I do so, I wanted an opinion as to whether these check valves if defective can potentially cause poor idle or excessive smoke at idle. I am thinking that these check valves would not be a possible cause as their purpose is to move oil from from the lower bearing to the upper bearing for lubrication purposes and not to burn it off at a cylinder. If this is the case, I may not want to bother disassembling stuff to test them at the moment. On the other hand, if they are also supposed prevent excess oil from building up at the lower section of the crankcase during idle to also prevent an idleing problem, then I might want to take the trouble to test them.

I attached a pic below to better show which check valves I am talking about.

Thanks in advance for any opinions on this.

 

[Dukedog]

Re: Testing bleed line check valves located at bearings

No on tha smoke. If they are bad, you will know it really quick .........