dc0341 Posted April 19 Report Posted April 19 Hello all, I recently had my vacuum pump replaced in my 83 M20J with an overhauled Tempest pump. After starting it up today, I noticed a large puddle of oil coming from the front nose gear door area. I took off the top cowling and noticed oil near the vacuum pump, near where it bolts onto the engine and below it. I checked all of the nuts on the pump and it was tight. The A&P also put a new gasket when replacing the pump. I checked the oil and noticed there was almost none left. During preflight, there was 6 quarts. Any suggestions on what it could be? Thanks. 1 Quote
N201MKTurbo Posted April 19 Report Posted April 19 I’ve only seen that much oil come from an oil filter that didn’t seat quite right. But considering that the pump was replaced, I would check that too. 3 Quote
PT20J Posted April 20 Report Posted April 20 On the -A3B6D engine, there is an adapter for the spin on filter that is attached to the accessory case by the threaded fitting that the filter screws onto. There is a rubber gasket between the adapter and the accessory case. When changing the filter it is possible that the adapter comes loose and damages the gasket. 4 Quote
MikeOH Posted April 20 Report Posted April 20 If the oil is coming from around the vacuum pump, my guess is something is wrong with the new gasket; torn, wrong, miss-installed?? Quote
cbarry Posted April 20 Report Posted April 20 I’m not a mechanic, but if I’m not mistaken, that tempest vacuum pump flange has a star/pointed shaped gasket that sits in the notched grooves that are centered on each side of the flange—rather than a traditional flange gasket. I bet there’s an issue with that gasket either missing or misaligned. 4 Quote
DCarlton Posted April 20 Report Posted April 20 7 hours ago, dc0341 said: Hello all, I recently had my vacuum pump replaced in my 83 M20J with an overhauled Tempest pump. After starting it up today, I noticed a large puddle of oil coming from the front nose gear door area. I took off the top cowling and noticed oil near the vacuum pump, near where it bolts onto the engine and below it. I checked all of the nuts on the pump and it was tight. The A&P also put a new gasket when replacing the pump. I checked the oil and noticed there was almost none left. During preflight, there was 6 quarts. Any suggestions on what it could be? Thanks. Curious. Did it blow all the oil out the first time it was started after maintenance or did it take a few starts or taxis for this to show up? Just learning from your experience. I’m adding vacuum pumps to my list of things to better understand and worry about list. Thanks. 2 Quote
Pinecone Posted April 20 Report Posted April 20 I like the fluorescent dye to find a leak. Clean the engine with mineral spirits. Add 1/2 ounce or so of the dye. Run engine at a fast idle 1200 RPM of higher for 2 minutes. Shut down, pull the cowl and use UV lamp to find leak/ 1 Quote
Fly Boomer Posted April 20 Report Posted April 20 12 hours ago, DCarlton said: things to better understand and worry about list. Before I came to MooneySpace. my list of things to worry about was manageable -- now that I read this forum almost every day, I worry about almost everything. 1 10 1 Quote
M20F Posted April 24 Report Posted April 24 Fill with oil Remove plugs Spin engine while somebody watches it gush out That type of loss should be easy to pin down. Quote
N177MC Posted April 28 Report Posted April 28 There is an oil seal at the base of the vacuum pump drive shaft. It's not the gaskets that insure against oil leaks - it's the seal ! Clearly the seal was compromised during the pump change. Remove the pump, pry out the oil seal (that's the difficult part) install new oil seal, gaskets and pump. Quote
Gee Bee Aeroproducts Posted May 8 Report Posted May 8 Ms9134-01 We duplicate all nla gaskets Tio541 was no stock made to oil pan Assy ams3320.093 Tooling 875.00 seal 275.00 delivery start to finish three days custom adel clamp silicone liner shown Quote
MB65E Posted May 10 Report Posted May 10 Gee, are those wide flange adel gaskets?! So neat!! A friend of mine makes silicone components on the Boom test airplane. Their engineering spec is very tight. He showed me the molds for the engine to airframe inlet. Much like a 731 Falcon inlet install. Really neat process. You’ll have my next customers hose order. In the OP pic what’s the gold/rusty part at the filter gasket area. That looks strange to me. -Matt Quote
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