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TonyAus

Oil Leakage - Crankcase Breather

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Well folks, not without several million small dramas, my 1925 roadster hit the road today. However, a larger drama has shown up. It is blowing oil out the crankcase breather and making a most unacceptable mess on every surface visited!

My first thought was blowby, but there is no blue exhast smoke and the rings are relatively new. In fact the problem looks like one of splash as the oil is deposited in lumps rather than as a mist.

I am sure there was no baffle in the breather. My second thought was to fit something lke a stainless steel scourer in the breather to catch the oil.

The third thought was that was that there is something fundamentally wrong - is there too much oil presure (very heathy at no less than 3 psi) or are the rod dippers going too far into the troughs - replacement pan of unknown origin and the gasket is relatively thin modern bonded cork.

Help - before the EPA get me.

Tony:eek:

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There is a cone shaped screen in the breather/filler. Oil vapor will condense on it and not blow out. I cut the bottom part off of a Collander and put that in it.. works fine..

Gary

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My 25 roadster has no oil coming from the oil fill pipe. It didn't when when the factory pistons/rings were in it, and it didn't after the pistons/rings were replaced.

It does't have the screen cone, although it probably should if it came with one.

How about the oil type/viscosity? Are you using a break-in oil (typically a light oil)?

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I use 20W 50 Castrol..I put new rings in it and converted the pistons to use a oil scavenging ring in the 4th groove..Only 13,000 miles total on it.. Now it uses very little oil and was always damp aroung the oil breather until I put that screen in it..

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Thanks for the advice on the screen. There was certainly not one on the car but I do not remember having oil problems many years ago. Then again, she was pretty oily all over.

I am using Penrite Shelsley Medium - an SAE 40 equivalent. But five quarts? By my reckoning that is only around 4.7 litres. I had to put in nearly eight litres to get the float rod up to the top mark. Could it be telling lies and causing my problem? If so, the oil level might be above the tray. I will check.

Tony

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It does sound like there is too much oil for it to splash about like that but then 4.7 litres is just over 1 gallon (1.05 gallons) and the recommended 5 quarts (1.25 gallons) should be about the right amount of oil. I would think that the strainer was there to stop rubbish going down the oil filler rather than to stop oil splashes. It's the first time I've heard of this happening. John

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If you are getting that much pressure in the crankcase, could be a cracked piston. Do a compression check. If one is low that could be the problem.

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Top casting mark is way too much. Correct amount is 5 qts which centers the rod between the casting marks.

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Looks like I stuffed up badly here. The book clearly states "between the marks"- I took that to mean the same as a modern dipstick - ie top mark is normal, lower mark is add. DOH!

However, all is not lost in that I found one more bit missing which could compromise my attempt at total authenticity (read anal retention). Does anyone out there have a spare breather screen?

And capacity still remains a problem in our communication - I notice in the replies a mixture of US, imperial and metric measure. I think I will just use five litres, which is our standard oil container here in Australia.

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And not only that . . . your garage/workshop is entirely too clean! Surely, some club or forum members can help with that.

My '24 threw oil, too, because I overfilled the crankcase. Five liters is equivalent to 5.3 quarts U.S. or 4.4 quarts U.K. That should be about right.

Nice looking DB. --Roberto

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So, if the steering wheel is on the wrong side on the right side. Then the Left side is the right side? ??

I used to get into this argument when I had a Bentley.

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I don't know, I think I may have to paint one of my roadster yellow! Beautiful car Tony!

The trunk area is different than the US version. Kinda looks like a combo between 1923 and 1926-27 models. Very clean lines.

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Pretty tricky there Phil, floppin' that image AND keeping the "Dodge" on the radiator reading correct!

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Ahhhhh....photoshop....what a great invention.

Yeah...wish I could Photoshop away a certain nagging problem with my DL that easily. :(

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