Walt
Well Known Member
Do you have a boroscope that can get into a cylinder?
Sorry no boro
Do you have a boroscope that can get into a cylinder?
So where do I go from here? Fuel injections and mags were rebuilt, engine driven fuel pump new, old hoses replaced, fuel filter checked and fuel tank vents are ok. Compression checked fine after the last occurance and the exhaust valve wobble test was passed.
I think i'll go back to drinking. I was better at that than owning/maintaining an airplane. It was a lot cheaper too.
2) I think the problem is one or more bad rings in #3 and may pull the cylinder next weekend and take it to a shop for a thorough check.
We have seen a oily bottom plug and some residual oil in the troublesome cylinder. Could that somehow be caused by oil backing up in the valve cover?
My buddy Mike (A&P) and I went to the hanber this morning to pull #3 cylinder. I was out of ideas and just decided to pull it and make sure every thing was right.
When I disconnected the oild drain line Mike blew throguh it and it felt to him like it was plugged. He blew more and all of a sudden it blew freely. We checked the other three lines and all blew freely.
We decided not to pull the cylinder until we get some understanding of what effects we would see in the engine from a plugged or mostly plugged oil drail line.
We have seen a oily bottom plug and some residual oil in the troublesome cylinder. Could that somehow be caused by oil backing up in the valve cover?
The plugged drain tube may have played a role but I do not understand the mechanism between the effect (rough engine, high EGT on the cylinder, loss of power) and the possible cause (clogged drain.).
Just returned home after a 6 hour 2 day cross country. No issues noted. Still planning on a weekend trip to see my father in law but maybe the problem is behind us.
If the drain was the problem the MMO bandaid will only cause minute harm to my pocketbook which is a small price to pay for peace of mind.
I have been flying RV's for 20+ years and operated my RV4 and current RVX on MoGas/MMO with REM 37BY plugs (Mag) and Autolite 386 plugs on my Electronic Ignition. I have had clean plugs and engines for over 2500 hours.
That's good enough for me...
V/R
Smokey