Thumper
Member
Is anyone able to post pictures of a/their 7KCAB with the cowling off and the components of the inverted oil system visible?
I'll take a look at the MX manual as I believe I got it with some other documents when purchasing the plane maybe even check the logs too. I am almost certain it lacks the Christen system however because I did not see the distinctive big white can on the firewall on either side nor did I see the three port shuttle valve anywhere when I was poking around with the cowling off.Do you have the maintenance manual? It discusses both types.
The Christen is characterized by a big can on the firewall, and a shuttle valve with three ports, from which your oil pump sucks. I can help a bit with that, but you probably have the other type.
Even with a known good system, glance at the oil pressure when you roll. It will go to zero, then right back up. If it doesn’t, roll right side up. Three seconds without pressure won’t hurt.
The airplanes came from the factory with both. Only E2B engines came with Christen (p.7-26) but the Champ system came with E2A and E2B. You need Bellanca Manual #320. 1974 is only the second year for the KCAB (apparently) so yours probably has the pickup in the sump.
I think your aircraft is required to have a functioning inverted oil system to be airworthy. It would take a field approval to remove it.
Hey bob appreciate the help upon looking at the engine logbooks and the service manual it does appear to be an IO-320-E2B and has the trap door type system rather than the Christen. It's weird how this info is not put anywhere in the POH nor can you really find much info on the Champ system on the internet. What I have found is that some people prefer the Champ system versus the Christen one.The airplanes came from the factory with both. Only E2B engines came with Christen (p.7-26) but the Champ system came with E2A and E2B. You need Bellanca Manual #320. 1974 is only the second year for the KCAB (apparently) so yours probably has the pickup in the sump.
I think your aircraft is required to have a functioning inverted oil system to be airworthy. It would take a field approval to remove it.