---------------------------------------------------------- Beech-List Digest Archive --- Total Messages Posted Sat 02/21/04: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:21 PM - Pushrod Oil Leak (Gary Strong) 2. 08:29 PM - Re: Pushrod Oil Leak (BobsV35B@aol.com) ________________________________ Message 1 _____________________________________ Time: 08:21:28 PM PST US From: "Gary Strong" Subject: Beech-List: Pushrod Oil Leak --> Beech-List message posted by: "Gary Strong" I have a 1979 V35B with the IO520 engine with about 800 hrs on a factory rebuild. I have been leaking oil out of the pushrod tubes right around where the springs and rubber gasket/washer meet at the crankcase. Not tons of oil, but definitely enough to make the cowling & belly oily. At the annual a few weeks ago we replaced all the seals with Real Gasket Pushrod seals w/ tapered springs (supposedly the best seals out there). Bottom line is I still see some oil leakage, while definitely less than was there previously. I've only owned the aircraft 2 years so I don't know if its always been this way since rebuild. I heard that possibly the oil fill cap/seal could be bad and cause some case pressure so I replaced that as well with no result. My question - Are oil leaks around the seals/springs common on the IO520? It is fixable or something I have to live with? What's the "normal" amount? Thanks! Gary N77QQ - Minneapolis ________________________________ Message 2 _____________________________________ Time: 08:29:46 PM PST US From: BobsV35B@aol.com Subject: Re: Beech-List: Pushrod Oil Leak --> Beech-List message posted by: BobsV35B@aol.com In a message dated 2/21/04 10:21:46 PM Central Standard Time, gjstrong@comcast.net writes: My question - Are oil leaks around the seals/springs common on the IO520? It is fixable or something I have to live with? What's the "normal" amount? Good Evening Gary, They should not be leaking. However, they can be a bear to get properly installed. Like any seal, they need to be installed carefully. I am not familiar with the tapered ones you are talking about, but most engines have little or no problem with normal push rod seals Happy Skies, Old Bob AKA Bob Siegfried Ancient Aviator Stearman N3977A Brookeridge Airpark LL22 Downers Grove, IL 60516 630 985-8502