The push in oil cap keeps blowing off! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72superBB · 12-24-2003, 12:10 AM

WTH?

I changed the intake, finally got the timing right. All good right?

I pull out of the drive and go along then accelerate prety good, and then bang, it hits the underside of the hood. So I go back and thought that maybe I left it off or in loose. I look it over and adjust the timing again.

I leave again and go a little further and and boom it happens again.

I have no explanation for this one. Fix one thing, and then another happens.

OOOOOOOOOOOOooooooooooooo boy!

thanks for listening!

Ron

DanoDMano · 12-24-2003, 12:12 AM

Got a plugged PCV Valve????? Too much crankcase pressure!!

**FRENCHBLUE72** · 12-24-2003, 12:14 AM

Had the same thing happen scared the crap outta me.. Never did fix the problem but did put in a new crate motor has not happend since.LOL

72superBB · 12-24-2003, 12:14 AM

Valve is not even a month old, but I guess I could replace to see if it changes anything. If it does not, then what?

cableguy0 · 12-24-2003, 12:17 AM

your building pressure somehow that pcv valve could be stuck most likely possibility

DanoDMano · 12-24-2003, 12:18 AM

Can you blow through it??

72superBB · 12-24-2003, 12:19 AM

uhhhh. blow through what?

ohh the valve! I gotcha! lol

I have not tried. I will just buy a new one in the morning to have a new one.

J.Lance · 12-24-2003, 12:20 AM

rattle the pcv valve just to make sure it isn't stuck. also check the hose to the carb and the carb itself. Has to be there somewhere. Your cap is on the same valve cover as the valve right?

72superBB · 12-24-2003, 12:25 AM

The valve is on the back drivers and the cap is the front passenger side. Where the cap is there used to be a hose going from the valve cover to the underside of the breather.

J.Lance · 12-24-2003, 12:45 AM

Do you have a breather on the same side as the oil fill? That could be your problem. On small blocks anyway, they have the fill on the same side as the pcv (both sides sometimes) and the pcv provides the pressure relief for that side. The other side has the vent hose running to the carb stack. If all you have on the passenger side is the oil fill with no breather, that could be the problem. I believe this is why earlier small blocks had the oil fill through the intake since there was no pcv valve on the cover. And of course, I could be completely off base here but that is my best guess.

Jason

DanoDMano · 12-24-2003, 12:46 AM

On mine the PCV is on the passenger side rear with hose to breather, the oil filler was on the drivers rear, and another hose went from the drivers front to the carb??

When I installed my New carb I went from the PCV to the carb, and then just have a filler on the drivers front.

dinnut · 12-24-2003, 12:50 AM

your engine is haunted man.......
i would think your pcv is stuck or something.

71-longbed · 12-24-2003, 07:43 AM

my stock 350 is setup like is :

passenger side.... front = oil cap
......rear = flame arrestor

driver side front = pcv valve

Huck · 12-24-2003, 11:05 AM

My pure stock 71 has the oil filler on the drivers rear and the pcv on the drivers front. It has the flame arrestor tube/hose to the carb stack on the pass rear. this setup insures pressure relief for both sides.

dinnut · 12-24-2003, 02:57 PM

yall are confusing me. heres what i got... is the thing on the passenger rear the pcv? and the drivers front is the oil filler/breather?

shuttermutt · 12-24-2003, 03:21 PM

Quote:

Originally posted by Huck
My pure stock 71 has the oil filler on the drivers rear and the pcv on the drivers front. It has the flame arrestor tube/hose to the carb stack on the pass rear. this setup insures pressure relief for both sides.

That's how I set mine up, too. The only difference is that I eliminated the hose on the passenger side and replaced it with a breather.

knucklebuster · 12-24-2003, 06:25 PM

Dinnut,Thats wher the pcv should go but I can't tell if you actually have one from this pic.It doesn't look like it from that angle,only looks like a hose.

12-24-2003, 12:10 AM	#1
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	The push in oil cap keeps blowing off! WTH? I changed the intake, finally got the timing right. All good right? I pull out of the drive and go along then accelerate prety good, and then bang, it hits the underside of the hood. So I go back and thought that maybe I left it off or in loose. I look it over and adjust the timing again. I leave again and go a little further and and boom it happens again. I have no explanation for this one. Fix one thing, and then another happens. OOOOOOOOOOOOooooooooooooo boy! thanks for listening! Ron __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-24-2003, 12:12 AM	#2
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Got a plugged PCV Valve????? Too much crankcase pressure!! __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-24-2003, 12:14 AM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,603	Had the same thing happen scared the crap outta me.. Never did fix the problem but did put in a new crate motor has not happend since.LOL __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

12-24-2003, 12:14 AM	#4
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	Valve is not even a month old, but I guess I could replace to see if it changes anything. If it does not, then what? __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-24-2003, 12:17 AM	#5
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	your building pressure somehow that pcv valve could be stuck most likely possibility __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

12-24-2003, 12:18 AM	#6
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	Can you blow through it?? __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-24-2003, 12:19 AM	#7
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	uhhhh. blow through what? ohh the valve! I gotcha! lol I have not tried. I will just buy a new one in the morning to have a new one. __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-24-2003, 12:20 AM	#8
J.Lance Too many is never enough! Join Date: May 2003 Location: Idaho Falls, ID Posts: 455	pcv valve rattle the pcv valve just to make sure it isn't stuck. also check the hose to the carb and the carb itself. Has to be there somewhere. Your cap is on the same valve cover as the valve right? __________________ Jason 1968 K10 SWB Fleetside 1971 K2500 GMC LWB 1968 K20 (later frame, donor body) 1972 C20 LWB parts truck 1993 K2500 Suburban, tow rig, 454, 4L80E NEW!! 18' Siem's car hauler 2004 Honda Odyssey (family man!)

12-24-2003, 12:25 AM	#9
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	The valve is on the back drivers and the cap is the front passenger side. Where the cap is there used to be a hose going from the valve cover to the underside of the breather. __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-24-2003, 12:45 AM	#10
J.Lance Too many is never enough! Join Date: May 2003 Location: Idaho Falls, ID Posts: 455	breather Do you have a breather on the same side as the oil fill? That could be your problem. On small blocks anyway, they have the fill on the same side as the pcv (both sides sometimes) and the pcv provides the pressure relief for that side. The other side has the vent hose running to the carb stack. If all you have on the passenger side is the oil fill with no breather, that could be the problem. I believe this is why earlier small blocks had the oil fill through the intake since there was no pcv valve on the cover. And of course, I could be completely off base here but that is my best guess. Jason __________________ Jason 1968 K10 SWB Fleetside 1971 K2500 GMC LWB 1968 K20 (later frame, donor body) 1972 C20 LWB parts truck 1993 K2500 Suburban, tow rig, 454, 4L80E NEW!! 18' Siem's car hauler 2004 Honda Odyssey (family man!)

12-24-2003, 12:46 AM	#11
DanoDMano Pronounced "Pew-al-up" Join Date: Oct 2002 Location: Puyallup, Washington Posts: 845	On mine the PCV is on the passenger side rear with hose to breather, the oil filler was on the drivers rear, and another hose went from the drivers front to the carb?? When I installed my New carb I went from the PCV to the carb, and then just have a filler on the drivers front. __________________ Classic GM Trucks of Washington Club Member 1970 FS chevy,350/350, Edelbrock cam and intake. Holley 650 carb,HEI,AT,Tangier Orange, 18's, Power Locks, Truck Photos

12-24-2003, 12:50 AM	#12
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	your engine is haunted man....... i would think your pcv is stuck or something. __________________ 70 longbed 496/th400/Ford 9"

12-24-2003, 07:43 AM	#13
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	my stock 350 is setup like is : passenger side.... front = oil cap ......rear = flame arrestor driver side front = pcv valve __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

12-24-2003, 11:05 AM	#14
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	My pure stock 71 has the oil filler on the drivers rear and the pcv on the drivers front. It has the flame arrestor tube/hose to the carb stack on the pass rear. this setup insures pressure relief for both sides.

12-24-2003, 02:57 PM	#15
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	yall are confusing me. heres what i got... is the thing on the passenger rear the pcv? and the drivers front is the oil filler/breather? Attached Images __________________ 70 longbed 496/th400/Ford 9"



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12-24-2003, 06:25 PM	#17
knucklebuster Failure is NOT an option! Join Date: Feb 2003 Location: greenwood s.c. Posts: 811	Dinnut,Thats wher the pcv should go but I can't tell if you actually have one from this pic.It doesn't look like it from that angle,only looks like a hose. __________________ House payment or truck parts?????.........why does life have to be so complicated? 1969 Chevy Shortbed Fleetside 1969 Camaro ps pb a/c(drove in high school now it's just a yard ornament,but it's next on the list for resto) 1990 Ni$$an hardbody( daily beater that has been really beaten!) 1999 Grand Am GT(wifes ride...never buy a pontiac!!Trust Me)

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