Blast Tube
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8360
- Posts: 15
- Joined: Fri Nov 30, 2018 11:08 pm
- Name: Mark Uhlman
- Location: Perry, Oklahoma
- Aircraft Type: 1947 C120
- Occupation-Interests: Chief Flight Instructor/DPE
- Contact:
Blast Tube
What is the purpose of the blast tube that runs from R-side upper baffle to oil screen on original c-85. It is missing on mine and it runs hot. Correlation? I have spin- on filter if it matters.
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6277
- Posts: 233
- Joined: Tue May 01, 2018 7:00 am
- Name: Ray Hunter
- Location: Ann Arbor, MI
- Aircraft Type: C-140
- Occupation-Interests: Retired AF, retired B-17 pilot for Michigan Flight Museum
- Contact:
Re: Blast Tube
Its purpose is to cool the oil as it passes through the oil screen housing. It does work. Part of the winterization process is to block the tube. If you have the spin on filter, the oil screen should be removed by de-soldering it from the fitting.
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6298
- Posts: 247
- Joined: Tue May 01, 2018 7:00 am
- Name: Randy Thompson
- Location: California
- Aircraft Type: Cessna 140
- Occupation-Interests: Work on airplanes and engines
- Contact:
Re: Blast Tube
They do work well.
All of the engine oil passes thru the oil screen housing, therefore blowing cool air on it cools the engine oil. I think Airforms in Alaska is making them now.
All of the engine oil passes thru the oil screen housing, therefore blowing cool air on it cools the engine oil. I think Airforms in Alaska is making them now.
Randy Thompson A&P IA Pilot
Hold STC SA547EA for installation of O-200 engine in Cessna 120/140 and 140A"s
Overhaul small Continentals
Hold STC SA547EA for installation of O-200 engine in Cessna 120/140 and 140A"s
Overhaul small Continentals
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4390
- Posts: 58
- Joined: Sat Jan 05, 2019 11:21 pm
- Name: Franklin B
- Aircraft Type:
- Occupation-Interests:
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Re: Blast Tube
I'm pretty sure it's required under the Cessna type certificate.
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8360
- Posts: 15
- Joined: Fri Nov 30, 2018 11:08 pm
- Name: Mark Uhlman
- Location: Perry, Oklahoma
- Aircraft Type: 1947 C120
- Occupation-Interests: Chief Flight Instructor/DPE
- Contact:
Re: Blast Tube
It appears to depend on model year. According to the parts manual, it was installed on all 46 models but left off of 47 120's (all) and 140's until serial #14,5XX or so. There is no fitting for it on my 47 120. Go figure.
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6863
- Posts: 139
- Joined: Tue May 01, 2018 7:00 am
- Name: John Kliewer
- Location: EWK Newton, KS
- Aircraft Type:
- Occupation-Interests: Corporate PIlot - retired
- Contact:
Re: Blast Tube
My '46 with C90 has a blast tube which I leave open for warm weather ops. On days of 40 degrees F or less I block the tube, and on days near freezing temps I also block the cooling ports on the nose bowl. I lay no claim to being an expert or even knowledgeable enough on this subject to pass along any advice - just doing what I think works best in view of oil temp gauge readings which I like to keep between 160 and 180 for at least 30 minutes on each flight. I'd be happy for any of you experts out there to correct me if I'm doing it wrong.
John Kliewer
"Make things as simple as possible but no simpler." Albert Einstiein
"Wheels move the body. Wings move the soul."
"Make things as simple as possible but no simpler." Albert Einstiein
"Wheels move the body. Wings move the soul."
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6643
- Posts: 2482
- Joined: Tue May 01, 2018 7:00 am
- Name: John C
- Location: KLCI, NH
- Aircraft Type: 1946 C140/C90
- Occupation-Interests: A&P, semi-retired
- Contact:
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7981
- Posts: 22
- Joined: Tue May 01, 2018 7:00 am
- Name: Jigger 87
- Location: Seattle/Tacoma
- Aircraft Type: C-120
- Occupation-Interests: A&P /IA retired
- Contact:
Re: Blast Tube
Mine also. Made a blast tube. HUGE differance. Also, there is an sump baffle which is usually missing. I know of no approval to leave it off.
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8376
- Posts: 32
- Joined: Wed Jan 02, 2019 12:07 am
- Name: James K
- Location: Anchorage, AK
- Aircraft Type: 140
- Occupation-Interests:
- Contact:
Re: Blast Tube
Since you mentioned the sump baffle...
When I did the STC to install the 150 exhaust my a&p said that the baffle no longer fit properly with the cross brace for the exhaust (cant remember the exact part number of that brace) and the baffle was removed. Living up here in AK where we have now passed our warmest weather for the year it hasn't proven to be a huge issue. Has anybody else run across this problem?
When I did the STC to install the 150 exhaust my a&p said that the baffle no longer fit properly with the cross brace for the exhaust (cant remember the exact part number of that brace) and the baffle was removed. Living up here in AK where we have now passed our warmest weather for the year it hasn't proven to be a huge issue. Has anybody else run across this problem?
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7981
- Posts: 22
- Joined: Tue May 01, 2018 7:00 am
- Name: Jigger 87
- Location: Seattle/Tacoma
- Aircraft Type: C-120
- Occupation-Interests: A&P /IA retired
- Contact:
Re: Blast Tube
Thanks. I have the C-150 STC also and did not know about the fit. I was going to get a piece of .032 anealed aluminum, cut and fit then heat treat. Temps dropped real well with blast tube. I will post if the "new" baffle works out.