Yong Heng oil level widow

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Rodeo

Rodeo

Member
Dec 19, 2017
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Maryland, United States
I started to change the oil in my Yong Heng today. I am switching from Royal Purple to Husky full synthetic oil. After draining the RP oil and flushing out the old residual oil with the new Husky oil - (Husky full synthetic is clear) - I noticed that the oil level sight window has a dirty oil film on it. Flushing with the new oil did not remove the film.

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I would like to clean it. Has anyone removed the sight window? Is it threaded into the casing cap or is there a retaining nut on the inside? I could take the case end cap off but have read that the sealing gasket is a pain to get back in place.
 
I wouldn't get my knackers in a knot. A lot of modern oils have additives that make them cling to surfaces to aid lubrication for cold starts. If you let it sit for a while it will probably clear enough to be able to see through. It certainly doesn't require pulling apart for something so minor. It could be just the rubber baffle-gasket trapping a little oil between it and the window.
 
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The cover gasket for the YH blocks most access for oil to easily move to the window due to what I see as "excess" material left on the gasket. It doesn't seal anything but blocks flow to the window. When I first got mine, I removed the cover to clean the inside and removed that section gasket that seals nothing but blocks oil moving to the window. It has worked fine that way for over 2 years now.
 
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I let the compressor sit and the dirty film did not drain away. I decided to give the sight widow a test turn and it came right out. The sight window threads into the cover plate and is sealed by a rubber gasket and some thread compound. I filled it with some liquid dish soap, let it sit, then rinsed it out. Came out perfectly clean.

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No squinting to see the oil level now and easy to tell if the oil is getting dirty. No pulling apart needed. It might be a minor thing but I'm going to do it every oil change.


 
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