Blowin oil out the dipstick?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sir_talk_alot · 02-12-2013, 08:14 AM

Hoping you guy can help me. My buddy has a 94 4x4. His 350 blows about a qt of oil out of the dipstick in about 30 mins-1hr of driving it. Before the dipstick it was blowing out the rearmain so he installed a new rearmain and now it blows out the dipstick tube. I know its over pressurizing, it has to be. Just cant figure out why. The pcv valve was cleaned. Any ideas? Im guessing theres maybe a clogged vent somewhere we have over looked. Thanks in advance.
Posted via Mobile Device

Bishops Trucks · 02-12-2013, 08:38 AM

Something has to be clogged somewhere. I'm sorry I have no insite to help you but I know someone on this site will speak up with an idea or solution.

sntrym95 · 02-12-2013, 03:13 PM

There's a vent on the driver's side valve cover close to the firewall. That should lead to the air cleaner. Check there, that's the only other breather besides the PCV valve that I know of.

scotts62 · 02-12-2013, 08:35 PM

How many miles is on it? Has a ton of crank pressure/blow by..

sir_talk_alot · 02-12-2013, 10:50 PM

Quote:

Originally Posted by scotts62

How many miles is on it? Has a ton of crank pressure/blow by..

i couldnt tell you, but i know it doesnt smoke or burn oil. if it smoked id figure that would be the cause is blow by but he says she doesnt smoke.

54 jimmy · 02-13-2013, 12:13 AM

if it is tbi check where the pcv valve hose goes in the tbi. they will get plugged up and cause a backup in the cranck case. had this problem with the 4.3 in my old s10 and 4.3 jimmy too. hope this helps. oh by the way the best stuff to break up the carbon in there is with gunk's air and intale cleaner. then pickup it out with a small pick.

SiCk_DiAbLo · 02-14-2013, 03:41 AM

Quote:

Originally Posted by 54 jimmy

if it is tbi check where the pcv valve hose goes in the tbi. they will get plugged up and cause a backup in the cranck case. had this problem with the 4.3 in my old s10 and 4.3 jimmy too. hope this helps. oh by the way the best stuff to break up the carbon in there is with gunk's air and intale cleaner. then pickup it out with a small pick.

I had that problem to with the carb, mine was clogged bad, had to hit it with an ice-pick...lol.

02-12-2013, 08:14 AM	#1
sir_talk_alot Registered User Join Date: May 2011 Location: Mayflower,AR Posts: 802	Blowin oil out the dipstick?? Hoping you guy can help me. My buddy has a 94 4x4. His 350 blows about a qt of oil out of the dipstick in about 30 mins-1hr of driving it. Before the dipstick it was blowing out the rearmain so he installed a new rearmain and now it blows out the dipstick tube. I know its over pressurizing, it has to be. Just cant figure out why. The pcv valve was cleaned. Any ideas? Im guessing theres maybe a clogged vent somewhere we have over looked. Thanks in advance. Posted via Mobile Device __________________ -Mike- '94 GMT 400 ext z71 3" body, 3 in rough country, hd mirrors, 20" motometals on 35s

02-12-2013, 08:38 AM	#2
Bishops Trucks KEEP ON TRUCKIN' Join Date: Jun 2005 Location: Sterling, Va. Posts: 5,731	Re: Blowin oil out the dipstick?? Something has to be clogged somewhere. I'm sorry I have no insite to help you but I know someone on this site will speak up with an idea or solution. __________________ JIM '97 GMC Sierra K1500 '95 Chevy Silverado C1500 '71 Cheyenne Z71 / LT1 & 4-Speed SWB K/10 Father/Son Project http://www.youtube.com/watch?v=4l689JKXPnA http://67-72chevytrucks.com/vboard/payments.php "LIVIN' FREE FOREVER"

02-12-2013, 03:13 PM	#3
sntrym95 Registered User Join Date: Jan 2006 Location: Big Pine Key, FL Posts: 745	Re: Blowin oil out the dipstick?? There's a vent on the driver's side valve cover close to the firewall. That should lead to the air cleaner. Check there, that's the only other breather besides the PCV valve that I know of. __________________ Mike

02-12-2013, 08:35 PM	#4
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,240	Re: Blowin oil out the dipstick?? How many miles is on it? Has a ton of crank pressure/blow by.. __________________ Scott 93 crew cab build Project 62

02-13-2013, 12:13 AM	#6
54 jimmy Registered User Join Date: Oct 2007 Location: pittston,PA Posts: 1,183	Re: Blowin oil out the dipstick?? if it is tbi check where the pcv valve hose goes in the tbi. they will get plugged up and cause a backup in the cranck case. had this problem with the 4.3 in my old s10 and 4.3 jimmy too. hope this helps. oh by the way the best stuff to break up the carbon in there is with gunk's air and intale cleaner. then pickup it out with a small pick. __________________ There is nothing you can't fix with a BFH or a FIRE WRENCH. 1997 chevy k1500 ext cab z71 (daily driver) sold 1996 chevy k1500 reg cab 4x4(daily driver)totaled 2008jeep patriot (wife's daily driver 2008 chevy 1500 ext cab 4x4 sold 2011 chevy 1500 crew cab ltz (daily driver) 1996 chevy 1500 reg cab 4x4 project sold 2006 pontiac grand prix gxp (daily work commuter)



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