ltdoyle

Possibly, but I heated oil in a pan to 200 F and the gauge was reporting pretty close to where 200F would be. Oil pressure drops from 90psi to about 65, so I think I am getting hot…

I have an IO-360-A3B6D that incurred a massive crankcase crack. It was disassembled and re assembled in a yellow tagged overhauled case and reinstalled into the airplane. Ever since, the oil temperature gauge “pegs” out on every flight. It starts and runs fine. The cylinders were sent off and “nuChromed” and have excellent compressions. I removed the Rochester temperature sensor and put it in hot oil with a thermometer. I have OEM analog gauges, but they appear to be reasonably accurate. I removed the vernatherm and placed it in hot water. It expanded accordingly and appears fine. I endoscoped the vernatherm housing and the seat looks good, no noticeable nicks or anomalies.I removed the oil cooler and sent it off and had it overhauled, and checked the oil lines for any obstructions or kinks. I have also reversed the oil lines to see if that made a difference. So far, nothing I have done has remedied the hot oil temperature. I am open to suggestions. Also, I know the vernatherm expands when hot, but how does that open the oil cooler lines? Does the seat move, and if so, could something be preventing it from opening up? All help appreciated!

Hey guys, looking for a replacement OEM oil temp gauge for my 1977 J. Thanks

Oil pressure drops slightly, cyl temps elevate some

Ok, this might be a little long, but it is kicking my backside. Last Oct, my engine crankcase (IO-360-A3B6D) had a massive crack under #1 cyl near Waco. I was able to make it to Waco and land safely. My A&P/IA and I removed the engine and brought it home where it was disassembled. There was no metal found and oil pressure never dropped. The engine had under 500 SMOH. We obtained a yellow tagged case and reassembled the engine. It now starts right up and runs great. However, the oil temperature gauge (OEM analog) will slowly climb in the pattern past the red line (245f) and will slowly drop to just under redline on descent to land at low power settings. Shortly after landing I can hit the oil filter with a laser temp finder and it will read 185-190f. I added a second temp probe on the front of the engine with a digital gauge. It too will get up to 230 or so. I have since tried two different vernatherms, replaced the factory temp sensor and flushed out the oil cooler. The original vernatherm end looked great. I flushed out the vernatherm cavity and reached in and felt with my fingertip and could not detect any burrs or imperfections. I’m still not convinced if I actually have high oil temperature, or if the gauge has gone wonky. I’m at a loss what to try next.

M20J with IO360-A3B6D field overhaul done. Now oil temp is too high. Is it possible that oil lines could be hooked up backwards and would that cause oil to get too hot?

It was overhauled in 2019

The engine was overhauled right at 500 hrs ago and that cylinder has never been off since.

Well, today sucked. Left Midway Waxahachie in my M20J and flew down to Temple and had lunch with my bud who is flying his Bonanza. On the return flight I just passed Waco and started getting a vibration. It started getting worse so I thought I better get on the ground and have a look at it so I did a u-turn and contacted Waco Tower. I told them I had a rough running engine and needed to land. As I approached the airport, the engine really started getting rough and I declared an emergency. Fortunately I landed without incident and taxied off the runway where the engine died. When I got out of the plane I saw it was oil leaking from the bottom of the engine. I pulled the top engine cover and saw the through bolt and two of the connecting bolts on cylinder number one were gone, and the case was cracked. I guess I was lucky I got it on the ground. In any case it appears I'm going to be looking for either an exchange engine or someone who can overhaul this one. Any advice would be great.

I was really happy with the oh done by Jewel, I think this is just one f those things that happens.

Standby vacuum

It is painted, overhaul was done by Jewell last April. I don't think it is patched, but maybe got thinned during inspection, bead blasting? I am thinking about draining the oil and cleaning it real good and trying a little JB Weld hi heat. If that did not work, then remove the pan and send it to someone like divco.

I have just under 100 SMOH on a Lycoming IO-360 installed in my J. The other day I went out and found a puddle of oil that had dripped down on the nose tire. After cleaning the engine and flying, I looked it over. What I discovered is a small oil puddle on the oil pan, directly above the intake tube. I would wipe it off, then watch it reform. Apparently there is a pin hole or very small crack at that location. Has any had this issue before and how was it corrected?

I had a similar problem on my 77. Does your dome light work? The dome light and electric clock are on the same circuit. It is fused with an in line fuse near the battery. Mine had blown.

"Caroline". It's a 1977 J model with WY as the N number alpha characters. In 1977, a girl named Caroline won Miss Wyoming.