When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
Hi, am doing a leak down test and am hearing air from the breather tubes. My compression test is 175 psi. What does it mean if air is leaking pass my breather tube?
My bike is burning 1 quart of oil every 250 miles.
Leak down from cylinder 2 Air coming from this breather hoses
How many miles on the motor? Which piston in the last image is from cylinder #2; the one on the right? Air from the breather tube would indicate air is leaking past the rings into the crank case and out the breathers. The first image appears to show that the leakage is holding at about 10% on cylinder #2 which is within an acceptable range; however I can't get the video in the last attachment to run so I can't see what the gauges are doing during testing so I don't know what is going on with the other cylinder.
I think the picture above of the OP holding the breather tube is a screenshot of a video he took, but no link or actual video for us........
That is correct. There is a series of images of the guages which I assumed were progressive while testing. Apparently, I mistook that series of photos as a video of the testing process but missing a link to display.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
Leakdown Test
