Orange Goop Explosion in Engine?
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Orange Goop Explosion in Engine?
I just had work done on my 170b (new generator & muffler), and I looked under the cowling after the first flight back up today.
To my shock, there was an orange mess below the generator and on the side of the firewall and battery. The substance was a wax-like goo, as it hardened as the engine cooled down.
I took the cowlings off and did a thorough inspection, but found no areas where I saw it could have leaked, burned, or melted from. There was no damaged oil hoses or scat tubing. The engine also ran fine with no indications of a problem.
My only guess is it came out of the vent hole on the bottom of the new generator, but it looks like it splattered against the side of it, not coming out the vent.
Thoughts?
To my shock, there was an orange mess below the generator and on the side of the firewall and battery. The substance was a wax-like goo, as it hardened as the engine cooled down.
I took the cowlings off and did a thorough inspection, but found no areas where I saw it could have leaked, burned, or melted from. There was no damaged oil hoses or scat tubing. The engine also ran fine with no indications of a problem.
My only guess is it came out of the vent hole on the bottom of the new generator, but it looks like it splattered against the side of it, not coming out the vent.
Thoughts?
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada
Re: Orange Goop Explosion in Engine?
Firstly, that tube on the bottom rear of your generator is not an exit vent. It is a cooling air INlet. It should be plumbed to a source of fresh, cool air, such as via the aft engine-cooling-baffle bulkhead. Air enters your generator thru that tube, then travels forward inside the generator and exits the generator at the forward generator openings next to the engine accessory-case.
There is nothing inside your generator (at least that should be there) that would result in a waxy, orange gel that hardens.
It may be possible that some object such as packing-material your mechanic may have left inside your cowling or exhaust/muffler that heated/melted and blew aft to splatter on the firewall, gen, etc.
I’m guessing something inside your muffler-shroud such as packing materials, etc. What exactly was done to your mufflers?
There is nothing inside your generator (at least that should be there) that would result in a waxy, orange gel that hardens.
It may be possible that some object such as packing-material your mechanic may have left inside your cowling or exhaust/muffler that heated/melted and blew aft to splatter on the firewall, gen, etc.
I’m guessing something inside your muffler-shroud such as packing materials, etc. What exactly was done to your mufflers?
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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- Posts: 165
- Joined: Tue Jan 05, 2021 1:34 am
Re: Orange Goop Explosion in Engine?
Thanks for the tips about the genny. I've never had a tube installed on any generator I've had, but I'll ask my mechanic about it on Monday.GAHorn wrote:Firstly, that tube on the bottom rear of your generator is not an exit vent. It is a cooling air INlet. It should be plumbed to a source of fresh, cool air, such as via the aft engine-cooling-baffle bulkhead. Air enters your generator thru that tube, then travels forward inside the generator and exits the generator at the forward generator openings next to the engine accessory-case.
There is nothing inside your generator (at least that should be there) that would result in a waxy, orange gel that hardens.
It may be possible that some object such as packing-material your mechanic may have left inside your cowling or exhaust/muffler that heated/melted and blew aft to splatter on the firewall, gen, etc.
I’m guessing something inside your muffler-shroud such as packing materials, etc. What exactly was done to your mufflers?
My RH muffler was replaced with a new one as the old one had cracks.
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada
- Bruce Fenstermacher
- Posts: 10318
- Joined: Tue Apr 23, 2002 11:24 am
Re: Orange Goop Explosion in Engine?
That is a mystery. Does it completely harden eventually?
What did your mechanic use as a gasket to install the generator. Hopefully only a new, complete gasket. By complete means he would have also had to remove and reinstall the tach drive as it has a shared gasket with the generator. Would he have used an orange silicone make a gasket?
If he used a orange silicone make a gasket I'd start to get real mad. I'd wonder about his work. And I'd probably have to have it done again this time by someone who knows orange silicone (or any color) is not necessary or called for in the maintenance manual in any application on the engine.
If you haven't, I'd be sending those pictures to the mechanic and asking him to identify the substance.
What did your mechanic use as a gasket to install the generator. Hopefully only a new, complete gasket. By complete means he would have also had to remove and reinstall the tach drive as it has a shared gasket with the generator. Would he have used an orange silicone make a gasket?
If he used a orange silicone make a gasket I'd start to get real mad. I'd wonder about his work. And I'd probably have to have it done again this time by someone who knows orange silicone (or any color) is not necessary or called for in the maintenance manual in any application on the engine.
If you haven't, I'd be sending those pictures to the mechanic and asking him to identify the substance.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Orange Goop Explosion in Engine?
From the X30013 Overhaul manual for your engine:
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
Re: Orange Goop Explosion in Engine?
You’ll have to let us know what the “orange goo” turns out to be. Looks just like something I’ve seen before…discovered on one of the main landing gear parts during post flight on the 550, we didn’t know what it was but thought maybe it could be remains of a bird strike. Turned out to be a large splatter of fresh grease left over from a recent gear inspection and lube.
Dustin Rhymes
'55 170B N4410B S/N 26754
'06 G550 “The Silver Bullet”
'55 170B N4410B S/N 26754
'06 G550 “The Silver Bullet”
Re: Orange Goop Explosion in Engine?
Reece,reecewallace wrote:... I looked under the cowling after the first flight back up today.
To my shock, there was an orange mess below the generator and on the side of the firewall and battery.
Thoughts?
Clearly a bird strike. Chicken À L'Orange. If it happened in the States the FAA would like you to fill out this form.
Gary
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Re: Orange Goop Explosion in Engine?
Didn't look like a bird strike to me. No indication of any strike (no feathers, bones, guts), and it's deep within the cowling. I've hit a bird before, and it was a lot different than this.n2582d wrote:Reece,reecewallace wrote:... I looked under the cowling after the first flight back up today.
To my shock, there was an orange mess below the generator and on the side of the firewall and battery.
Thoughts?
Clearly a bird strike. Chicken À L'Orange. If it happened in the States the FAA would like you to fill out this form.
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada
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- Posts: 165
- Joined: Tue Jan 05, 2021 1:34 am
Re: Orange Goop Explosion in Engine?
I'll let you know! My mechanic is going to look at it tomorrow and I'll post here about it once he doesdarhymes wrote:You’ll have to let us know what the “orange goo” turns out to be. Looks just like something I’ve seen before…discovered on one of the main landing gear parts during post flight on the 550, we didn’t know what it was but thought maybe it could be remains of a bird strike. Turned out to be a large splatter of fresh grease left over from a recent gear inspection and lube.
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada
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- Posts: 165
- Joined: Tue Jan 05, 2021 1:34 am
Re: Orange Goop Explosion in Engine?
My mechanic used the proper gasket to install the generator, not silicone. My best guess is it was some type of grease or compound build up that splattered once I took off. The waxiness of it is odd though.Bruce Fenstermacher wrote:That is a mystery. Does it completely harden eventually?
What did your mechanic use as a gasket to install the generator. Hopefully only a new, complete gasket. By complete means he would have also had to remove and reinstall the tach drive as it has a shared gasket with the generator. Would he have used an orange silicone make a gasket?
If he used a orange silicone make a gasket I'd start to get real mad. I'd wonder about his work. And I'd probably have to have it done again this time by someone who knows orange silicone (or any color) is not necessary or called for in the maintenance manual in any application on the engine.
If you haven't, I'd be sending those pictures to the mechanic and asking him to identify the substance.
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada
- Bruce Fenstermacher
- Posts: 10318
- Joined: Tue Apr 23, 2002 11:24 am
Re: Orange Goop Explosion in Engine?
Good to hear your mech didn't use silicone, but you know somewhere someone else has. To be honest it didn't really look like a splattering of silicone but I couldn't think of any other orange substance that would/could be found at that location. Kind of looks like Model 28 though that is more red.reecewallace wrote: My mechanic used the proper gasket to install the generator, not silicone. My best guess is it was some type of grease or compound build up that splattered once I took off. The waxiness of it is odd though.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
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- Posts: 165
- Joined: Tue Jan 05, 2021 1:34 am
Re: Orange Goop Explosion in Engine?
UPDATE
Turns out, the substance was paraffin wax and it was coming from within my newly overhauled generator.
I took the cover off the generator and it was pooled full of wax. I used a heat gun to melt and clean all the wax off the firewall and surrounding areas, and it melted at a relatively low temperature.
The overhaul shop said it's now standard practice the cores are coated in wax during storage, and it melts off when it heats up. However, the technician told me it shouldn't melt off in winter temps (about 4°C), and usually melts during the summer. He said the generator may have been overworked (maybe a regulator issue?).
That said, the generator is attached to an extremely hot engine which I feel would melt the wax, even in the winter.
Turns out, the substance was paraffin wax and it was coming from within my newly overhauled generator.
I took the cover off the generator and it was pooled full of wax. I used a heat gun to melt and clean all the wax off the firewall and surrounding areas, and it melted at a relatively low temperature.
The overhaul shop said it's now standard practice the cores are coated in wax during storage, and it melts off when it heats up. However, the technician told me it shouldn't melt off in winter temps (about 4°C), and usually melts during the summer. He said the generator may have been overworked (maybe a regulator issue?).
That said, the generator is attached to an extremely hot engine which I feel would melt the wax, even in the winter.
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada
- daedaluscan
- Posts: 497
- Joined: Fri Apr 20, 2012 7:03 pm
Re: Orange Goop Explosion in Engine?
I ran a scat hose to the new generator that I installed on my O-300.I just felt better having something hooked up to that cooling fitting on the generator.
No idea if it helped, but it ran fine until I pulled it. Pretty easy to do from almost straight above the generator.
No idea if it helped, but it ran fine until I pulled it. Pretty easy to do from almost straight above the generator.
Charlie
1956 170B C-GDRG #27019
1956 170B C-GDRG #27019
Re: Orange Goop Explosion in Engine?
Reece….. exactly from WHOM (which Overhaul Shop) did you purchase that generator? I’m very curious who it is that is coating armatures with WAX. The only thing I’ve ever seen used for protective coatings of fields and armatures is shellac.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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- Posts: 165
- Joined: Tue Jan 05, 2021 1:34 am
Re: Orange Goop Explosion in Engine?
I purchased it from Falcon Aero --> http://falconaeroparts.com/GAHorn wrote:Reece….. exactly from WHOM (which Overhaul Shop) did you purchase that generator? I’m very curious who it is that is coating armatures with WAX. The only thing I’ve ever seen used for protective coatings of fields and armatures is shellac.
Also, we looked in the 170b illustrated catalog, and the generator is not hooked up to a scat hose in this instance. My mechanic said in some planes it's illustrated to connect it, but not the 170b.
- Reece
1956 Cessna 170b
Nanaimo, BC Canada
1956 Cessna 170b
Nanaimo, BC Canada