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Jul 21st, 2025 | | | | Joined: Jul 2005 Posts: 52 'Bolter | | 'Bolter Joined: Jul 2005 Posts: 52 | I have an older 235 that has a breather tube with a cap.
When the engine is running, there is no puffing or air discharge from the bottom of the vent tube. I think thats good.
When the engine is running you can see oil leaking from beneath the cap. The oil drips down the outside of the vent tube and marks the floor. The oil escaping is constant.
Maybe the cap gasket needs fixing?
Has anyone ever had this problem? | | | | | Joined: Aug 2008 Posts: 230 Shop Shark | | Shop Shark Joined: Aug 2008 Posts: 230 | sound's like a little bit of blow bye the ring's ,try to clean the breather cap out it may help delay the drips and change the gasket to make it fit tighter ,any coming out the road draft tube ? | | | | | Joined: Jul 2005 Posts: 52 'Bolter | | 'Bolter Joined: Jul 2005 Posts: 52 | Nothing is coming out of the road draft tube...in fact I feel no air movement from it when the engine is running.
Maybe it is blocked & some pressure is escaping from the cap? | | | | | Joined: Apr 2007 Posts: 88 Shop Shark | | Shop Shark Joined: Apr 2007 Posts: 88 | I have seen mud dauber wasp plug that tube solid which caused the same leak ether way remove tube and make sure it is clean | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 |
Yes, it sounds like the road-draft tube is blocked/clogged. It is fairly easy to knock the tube out of the block and check to see if it is clogged (it is press-fitted into the block).
You can soak the tube in kerosene in an attempt to unclog it (some people have reported that they burn-out a clogged road-draft tube - I have never done that).
| | | | | Joined: Jun 2001 Posts: 379 Shop Shark | | Shop Shark Joined: Jun 2001 Posts: 379 | I've used a wallpaper steamer to steam them clean. When they plug they really plug and you should probably cycle some solvent or diesel through it before using the steamer. | | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | How good is the gasket on the cap?
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Jun 2001 Posts: 379 Shop Shark | | Shop Shark Joined: Jun 2001 Posts: 379 | Is the oil baffle in place? | | |
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