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04-28-2020, 01:18 PM
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#1 |
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Registered User
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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New engine smell???
Hey guys, just dropped a new 350 in the 68, now I notice the smell of burning oil after driving for about 15 mins. There are no leaks/ puddles after driving or sitting over night. It also doesn’t appear to be the heater core as it’s also isn’t leaking and there are no melted wires. Any ideas? Thanks
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04-28-2020, 01:24 PM
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#2 |
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Proprietor of Dale's Corner
 
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,245
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Re: New engine smell???
Are you smelling oil or paint curing and burning off?
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul |
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04-28-2020, 01:46 PM
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#3 |
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Registered User
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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Re: New engine smell???
Did you break in the cam and change the oil before driving it?
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1968 GMC C2500 Long Bed Fleetside |
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04-28-2020, 02:44 PM
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#4 |
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Registered User
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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Re: New engine smell???
Brake in was done as per GM instructions. It’s oil.
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04-28-2020, 02:56 PM
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#5 |
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Registered User
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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Re: New engine smell???
PCV working correcty?
Strong oil smell under the hood or out the exhaust? It's not belt rubber smell? A slight leak can run onto the headers/maniflods and burn off without any drips or puddles (so can antifreeze leaks). Is it brake fluid on the discs/drums? Ol Blue hit on something that always takes me by surprise...when a fresh motor starts up and starts smoking the paint (or oil residues from assembly) of the manifolds.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
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04-28-2020, 02:58 PM
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#6 |
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Registered User
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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Re: New engine smell???
How many miles since you changed the oil? I recently did my first break in and had a similar issue that went away after a second oil change.
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1968 GMC C2500 Long Bed Fleetside |
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04-28-2020, 02:59 PM
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#7 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: New engine smell???
Look on the back of the intake. Could be china wall gasket or oil pressure fitting. Any leaks there don’t show up on the floor. Just coats the top of the trans and underside of the truck.
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04-28-2020, 03:02 PM
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#8 | |
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Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: New engine smell???
Quote:
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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04-28-2020, 04:08 PM
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#9 |
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Registered User
Join Date: Mar 2014
Location: Lincoln Park, NJ
Posts: 190
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Re: New engine smell???
it might also be leaking/seeping valve cover gaskets, especially with the older flange bolted valve covers. that would leak out onto the manifolds and burn and likely not make it to the floor for quite a while.
__________________
 1970 C10 LWB 350SBC, SM330 Muncie (not saginaw SM326) (on tree), 3.07 open (assumed), PS, PB, Idiot lights
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04-29-2020, 07:48 PM
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#10 |
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Senior Member
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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Re: New engine smell???
Best thing is dust with baby powder and run engine and see if you see a wet spot or oil trail
__________________
Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks 
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04-30-2020, 11:56 AM
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#11 |
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Registered User
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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Re: New engine smell???
Thanks guys! I will checking all of these things in the coming days and will keep you posted ��
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05-01-2020, 09:13 AM
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#12 |
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Registered User
Join Date: Jan 2009
Location: colorado springs
Posts: 479
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Re: New engine smell???
Did you by chance put in any new exhaust parts?I have had burning smell from new mufflers and headers in the past. Sometimes they are coated with an oil for storage , then it burns off in the first couple warm ups.
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05-04-2020, 09:14 PM
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#13 |
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Registered User
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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Re: New engine smell???
Well, guys the mystery continues. I checked your recommendations and nothing. Thanks again
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05-04-2020, 10:49 PM
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#14 | |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,677
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Re: New engine smell???
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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05-05-2020, 12:21 AM
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#15 |
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Registered User
Join Date: Nov 2012
Location: canby,oregon
Posts: 356
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Re: New engine smell???
Has to be an external leak somewhere,i would drive it till it smells and pull into dark shop with flashlight to inspect,smoke shows up better in the dark. Only so many places it could leak,intake,distributor,valvecovers,fuelpump,oil pressure,timing chain/oil pan or the rear seal,God forbid you have a leaky oil galley plug.
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05-05-2020, 12:42 AM
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#16 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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Re: New engine smell???
Could be internal too.
Poorly installed intake gasket that’s not sealing and oil is being pulled up from the lifter valley. |
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05-05-2020, 09:11 PM
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#17 |
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Just here to tinker
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: New engine smell???
If you can't find any external leaks, pull plugs and look to see if any cylinders are oil soaked. If you find one, perform a leak down test of that cylinder to see what exactly failed.
__________________
78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) |
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05-06-2020, 09:07 PM
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#18 |
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Registered User
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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Re: New engine smell???
I’m not getting emails from this site anymore, sorry for the late response. I’ll try to start checking in more. I’m actually over 1.5 hours from Ventura, Steeveedee- thanks for the offer though. I’ll keep looking and try your suggestions but it may be a week or 2... Thanks again everyone.
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05-08-2020, 05:29 PM
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#19 |
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Registered User
Join Date: Nov 2012
Location: canby,oregon
Posts: 356
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Re: New engine smell???
I would think a internal leak would let stink go out the tailpipe unless you have some serious exhaust leakage but one never knows how another rig blows. Do not forget it takes a little bit for new rings to seat and sometimes especially with high oil pressure systems oil can make it past the rings and give off a unburnt petroleum smell from the exhaust stroke,I love that smell but this sounds different,good luck.
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06-17-2020, 10:39 PM
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#20 |
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Registered User
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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Re: New engine smell???
Found it. Not the engine but the transmission. New tranny and we’re off. Thanks everyone for the suggestions.
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06-18-2020, 12:22 AM
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#21 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,722
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Re: New engine smell???
Sure didn't see that one coming! Glad you found it & got it fixed!
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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06-18-2020, 09:09 AM
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#22 |
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Registered User
 Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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Re: New engine smell???
Just before you posted the trans, I was thinking vacuum modulator. It doesn't happen often, but when it does, it's hard to find.
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