X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 31 May 2012 16:45:36 -0400 Message-ID: X-Original-Return-Path: Received: from a2s34.a2hosting.com ([216.119.134.2] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5571235 for lml@lancaironline.net; Thu, 31 May 2012 15:43:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.119.134.2; envelope-from=lorn@dynacomm.us Received: from c-68-42-83-236.hsd1.mi.comcast.net ([68.42.83.236]:53149 helo=[192.168.1.9]) by a2s34.a2hosting.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.77) (envelope-from ) id 1SaBGz-00104B-Us; Thu, 31 May 2012 15:43:06 -0400 From: Lorn H Olsen Content-Type: multipart/alternative; boundary="Apple-Mail=_48E04604-9BBB-4FB9-8DA8-CB7300BFA5FE" Subject: Re: hartzell 68" props for 360 with 200+HP X-Original-Date: Thu, 31 May 2012 15:43:04 -0400 X-Original-Message-Id: X-Original-Cc: steve , Jack H Webb X-Original-To: Lancair List Mime-Version: 1.0 (Apple Message framework v1278) X-Mailer: Apple Mail (2.1278) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - a2s34.a2hosting.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - dynacomm.us X-Source: X-Source-Args: X-Source-Dir: --Apple-Mail=_48E04604-9BBB-4FB9-8DA8-CB7300BFA5FE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Steve, I found this excerpt from the Sky Ranch Engineering Manual. Failure to change pitch or rpm. 1. If rpm fails to decrease during or after takeoff: insufficient = counterweight force and/or high friction in the hub parts. 2. If rpm fails to increase but will reduce: low oil pressure. 3. If rpm change in both directions is sluggish: Excessive friction in = hub mechanism. 4. Newly-installed governor has wrong direction of rotation, or has = bypass plug in wrong hole. 5. Transfer-collar distress on Continental engines will cause sluggish = or erratic propeller operation. 6. Internal engine oil leak on Lycoming engines. With Lycoming engines = you need to check main bearing clearance and rear plug in center of = crankshaft for leaks. Remove propeller governor. There is a passage that = goes down to the center of the front main bearing. The big hole indexes = to the oil transfer tube which goes to prop governor. Take a = differential pressure tester and with a rubber end push against passage. = Apply 40 pounds in and as oil blows out of bearing you will see the = secondary gauge come down. After 15 or 20 seconds you want to see 5 = pounds or more. If the bearings will not hold 5 pounds you have an = unacceptable leak. This is a quick and easy test to do after engine = assembly at overhaul. -- Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us LNC2, FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE Michigan --Apple-Mail=_48E04604-9BBB-4FB9-8DA8-CB7300BFA5FE Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Failure to change pitch or rpm.

1. If rpm fails to decrease = during or after takeoff: insufficient counterweight force and/or high = friction in the hub parts.

2. If rpm fails to increase but will = reduce: low oil pressure.

3. If rpm change in both directions is = sluggish: Excessive friction in hub mechanism.

4. Newly-installed = governor has wrong direction of rotation, or has bypass plug in wrong = hole.

5. Transfer-collar distress on Continental engines will = cause sluggish or erratic propeller operation.

6. Internal engine oil leak on Lycoming = engines. With Lycoming engines you need to check main bearing clearance = and rear plug in center of crankshaft for leaks. Remove propeller = governor. There is a passage that goes down to the center of the front = main bearing. The big hole indexes to the oil transfer tube which goes = to prop governor. Take a differential pressure tester and with a rubber = end push against passage. Apply 40 pounds in and as oil blows out of = bearing you will see the secondary gauge come down. After 15 or 20 = seconds you want to see 5 pounds or more. If the bearings will not hold = 5 pounds you have an unacceptable leak. This is a quick and easy test to = do after engine assembly at overhaul.


--
Lorn H. 'Feathers' Olsen, MAA, = ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, = FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE = Michigan

= --Apple-Mail=_48E04604-9BBB-4FB9-8DA8-CB7300BFA5FE--