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09-02-2013, 11:35 PM
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#1 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
Posts: 51
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Engine blowing oil around carb onto intake
My engine is blowing oil out all over the place. It's pooling up on the intake under the breather on both sides of the carb. Any ideas what's causing this? Casting number cross references to 307 but the guy I got it from says its a 350 with a fairly recent overhaul. I'm not sure....
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09-03-2013, 12:04 AM
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#2 |
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Senior Member
 
Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,494
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Re: Engine blowing oil around carb onto intake
So...wheres it coming from? It might be something as simple as loose intake bolts.
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09-03-2013, 12:12 AM
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#3 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
Posts: 51
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Re: Engine blowing oil around carb onto intake
Wide side: hello from just up the road a bit!!!! I wished I knew where it was coming from. I don't think it's intake bolts because there are no water leaks or apparent vacuum/air leaks because it runs ok but I will check for sure tomorrow. I hope it's something simple and not major. Could it be a major issue?????
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09-03-2013, 12:28 AM
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#4 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,586
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Re: Engine blowing oil around carb onto intake
Intake bolts can leak oil even if they're tight, and without air or water leaks. Some of the bolts extend into the lifter galley. Can't recall which bolts need thread sealer..... hopefully someone will jump in. Or just seal them all to be sure.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay Last edited by Stocker; 09-03-2013 at 12:35 AM. |
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09-03-2013, 02:33 AM
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#5 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Engine blowing oil around carb onto intake
My first thought was no sealant on the intake bolts, Most intakes need to be re torqued after a bit of run time.
Do you have a copper oil line running to the oil pressure gauge? make sure its not got a pin hole and spraying oil (yea i just come up with any other possible source of oil, seem pretty far fetched)
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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09-03-2013, 04:24 AM
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#6 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
Posts: 51
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Re: Engine blowing oil around carb onto intake
Yes copper line, I will check that to. I'm really worried because I read some info on this when I googled it and many say it is caused by blow by due to bad piston rings, etc, any thoughts on that? Is that possible?
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09-03-2013, 05:48 AM
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#7 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
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Re: Engine blowing oil around carb onto intake
Forgot to mention that oil pressure is good when cold but gage bottoms out when hot at idle but jumps right back up and pegs out when u give it gas
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09-03-2013, 07:58 AM
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#8 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,861
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Re: Engine blowing oil around carb onto intake
What do you have for crankcase ventilation? Are the valve covers n& air cleaner original? Is there a tube to the filter housing from the valve cover and a PCV valve on the other side? If it has aftermarket valve covers & air cleaner,what's there for venting? If you have a PCV valve,is it clogged?
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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09-03-2013, 08:01 AM
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#9 |
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Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,556
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Re: Engine blowing oil around carb onto intake
Gonna need some pics here.
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09-03-2013, 08:12 AM
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#10 |
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Join Date: Apr 2013
Location: Belton, tx
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Re: Engine blowing oil around carb onto intake
Ill get some pics together later today. I will look at the crankcase ventilation as well....
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09-03-2013, 08:39 AM
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#11 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Engine blowing oil around carb onto intake
Could also be as simple as valve cover gaskets though they usually leak on the outside.However I have seen people tighten them too much on the outter bolts and cause a leak on the intake side.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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09-03-2013, 09:29 AM
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#12 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,141
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Re: Engine blowing oil around carb onto intake
The two center intake bolts on both sides go into the lifter valley and need sealant or they will leak.
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09-03-2013, 09:34 AM
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#13 | |||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,930
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Re: Engine blowing oil around carb onto intake
Quote:
A functioning PCV system is paramount in these old engines. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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09-03-2013, 01:32 PM
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#14 | |
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Florida Edition
Join Date: Oct 2010
Location: Fruitland Park, FL
Posts: 4,022
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Re: Engine blowing oil around carb onto intake
Quote:
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09-03-2013, 10:05 PM
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#15 |
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Special Order
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,861
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Re: Engine blowing oil around carb onto intake
Those intake bolts can leak (seep),but not how the author of this thread describes.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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09-03-2013, 11:10 PM
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#16 |
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Account Suspended
Join Date: Apr 2013
Location: Belton, tx
Posts: 51
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Re: Engine blowing oil around carb onto intake
Not sure what's going on yet, did not get a chance to look into it today. The oil seems to pool up more on the drivers side than the passenger side. Ther reason I say it's "spraying is because there is a light film of oil on the underside of the breather and on the carb, valve cover and intake all around the carb area. Confused!!!!!
Posted via Mobile Device Last edited by Jdbfish; 09-03-2013 at 11:20 PM. |
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09-03-2013, 11:24 PM
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#17 |
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Account Suspended
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Location: Belton, tx
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Re: Engine blowing oil around carb onto intake
Posted via Mobile Deviceanother pic
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09-03-2013, 11:26 PM
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#18 |
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Account Suspended
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Location: Belton, tx
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Re: Engine blowing oil around carb onto intake
Posted via Mobile Deviceand one more
Posted via Mobile Device Posted via Mobile Device |
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09-03-2013, 11:32 PM
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#19 |
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Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Re: Engine blowing oil around carb onto intake
You absolutely certain it is oil, and not coolant that has mixed with grime to become that color?
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