The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-28-2020, 01:18 PM   #1
68Blu
Registered User
 
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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
68Blu is offline   Reply With Quote
Old 04-28-2020, 01:24 PM   #2
Ol Blue K20
Proprietor of Dale's Corner
 
Ol Blue K20's Avatar
 
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,245
Re: New engine smell???

Are you smelling oil or paint curing and burning off?
__________________
"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
Ol Blue K20 is offline   Reply With Quote
Old 04-28-2020, 01:46 PM   #3
Willys_MB
Registered User
 
Willys_MB's Avatar
 
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
Re: New engine smell???

Did you break in the cam and change the oil before driving it?
__________________
1968 GMC C2500 Long Bed Fleetside
Willys_MB is offline   Reply With Quote
Old 04-28-2020, 02:44 PM   #4
68Blu
Registered User
 
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
Re: New engine smell???

Brake in was done as per GM instructions. It’s oil.
68Blu is offline   Reply With Quote
Old 04-28-2020, 02:56 PM   #5
sick472
Registered User
 
sick472's Avatar
 
Join Date: Jul 2015
Location: Sedalia Mo.
Posts: 1,131
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.
__________________
He who is without oil shall throw the first rod. Compressions 8.7:1

1972 C10
1976 C10 (parts truck)
1985 K20
sick472 is offline   Reply With Quote
Old 04-28-2020, 02:58 PM   #6
Willys_MB
Registered User
 
Willys_MB's Avatar
 
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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.
__________________
1968 GMC C2500 Long Bed Fleetside
Willys_MB is offline   Reply With Quote
Old 04-28-2020, 02:59 PM   #7
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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.
geezer#99 is offline   Reply With Quote
Old 04-28-2020, 03:02 PM   #8
hamjet
Registered User
 
hamjet's Avatar
 
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
Re: New engine smell???

Quote:
Originally Posted by geezer#99 View Post
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.
or dripping on the exhaust pipe..
__________________
Thanks, Joe..
1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB.
hamjet is offline   Reply With Quote
Old 04-28-2020, 04:08 PM   #9
zosoppp
Registered User
 
Join Date: Mar 2014
Location: Lincoln Park, NJ
Posts: 190
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
zosoppp is offline   Reply With Quote
Old 04-29-2020, 07:48 PM   #10
bigmac73
Senior Member
 
bigmac73's Avatar
 
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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
bigmac73 is offline   Reply With Quote
Old 04-30-2020, 11:56 AM   #11
68Blu
Registered User
 
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
Re: New engine smell???

Thanks guys! I will checking all of these things in the coming days and will keep you posted ��
68Blu is offline   Reply With Quote
Old 05-01-2020, 09:13 AM   #12
fdbdw
Registered User
 
fdbdw's Avatar
 
Join Date: Jan 2009
Location: colorado springs
Posts: 479
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.
fdbdw is offline   Reply With Quote
Old 05-04-2020, 09:14 PM   #13
68Blu
Registered User
 
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
Re: New engine smell???

Well, guys the mystery continues. I checked your recommendations and nothing. Thanks again
68Blu is offline   Reply With Quote
Old 05-04-2020, 10:49 PM   #14
Steeveedee
Who Changed This?
 
Steeveedee's Avatar
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,677
Re: New engine smell???

Quote:
Originally Posted by 68Blu View Post
Well, guys the mystery continues. I checked your recommendations and nothing. Thanks again
Central coast- are you around Ventura somewhere thereabouts? Maybe there's somebody that could come by and take a look-see. Plenty of board members in California. Just saying. I'm about 40 miles from you. Maybe I can make an excuse to go to a store in Ventura if I can evade the popo.
__________________
~Steven

'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper

Simi Valley, CA
Steeveedee is offline   Reply With Quote
Old 05-05-2020, 12:21 AM   #15
bcfishon
Registered User
 
Join Date: Nov 2012
Location: canby,oregon
Posts: 356
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.
bcfishon is offline   Reply With Quote
Old 05-05-2020, 12:42 AM   #16
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
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.
geezer#99 is offline   Reply With Quote
Old 05-05-2020, 09:11 PM   #17
Corts60
Just here to tinker
 
Corts60's Avatar
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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.
Corts60 is offline   Reply With Quote
Old 05-06-2020, 09:07 PM   #18
68Blu
Registered User
 
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
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.
68Blu is offline   Reply With Quote
Old 05-08-2020, 05:29 PM   #19
bcfishon
Registered User
 
Join Date: Nov 2012
Location: canby,oregon
Posts: 356
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.
bcfishon is offline   Reply With Quote
Old 06-17-2020, 10:39 PM   #20
68Blu
Registered User
 
Join Date: Jun 2019
Location: California Central Coast
Posts: 82
Re: New engine smell???

Found it. Not the engine but the transmission. New tranny and we’re off. Thanks everyone for the suggestions.
68Blu is offline   Reply With Quote
Old 06-18-2020, 12:22 AM   #21
Stocker
20' Daredevil (Ret)
 
Stocker's Avatar
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,722
Re: New engine smell???

Sure didn't see that one coming! Glad you found it & got it fixed!
__________________
- Mike -

1972 K20 LWB 350/350/205

RIP El Jay
Stocker is offline   Reply With Quote
Old 06-18-2020, 09:09 AM   #22
BigBird05
Registered User
 
Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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.
BigBird05 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:18 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com