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72superBB · 12-02-2003, 07:22 PM

Please help me with this post.

thanks

http://67-72chevytrucks.com/vboard/s...threadid=79272

here are the compression results
...............................firewall
passenger side................................drivers side
155......................................................145

150......................................................150

160......................................................145

145......................................................140
..........................water pump

hope this helps anyone!

lukecp · 12-02-2003, 07:31 PM

Interesting....does the engine burn any oil (blue smoke?) ?

Maybe it is coming from that vent tube you have going from the valve cover to the air cleaner....is the inside of the tube all oily?

Are you running a PCV valve? (the tube looks more like a vent tube....could be a big block PCV, i dunno)

72superBB · 12-02-2003, 07:34 PM

There is a pcv valve on the other side. I was told the tube you see is called a flame arrestor (sp). It does smoke a tiny bit when started. What is in the picture is what happend after a 120 mile trip.

lukecp · 12-02-2003, 07:40 PM

I would check the inside of the flame arrestor tube then....along with the inside of the PCV valve tube....they could be sucking in oil....just a guess

jhow66 · 12-02-2003, 08:12 PM

Check your PCV valve to see if it working--pull it from valve cover with motor running and put you finger over the end of PCV --if working it will have a suction on it. If not you will build up pressure in crankcase from the blowby (air that is forced by piston rings when a cylinder fires) which forces oil mist up the tube into air cleaner. Where is the PCV hooked up to on carb? If hooked up right and it is working you have bad, broken or worn out compression rings. What the PCV valve does is create a suction inside the motor to pull out any blowby and run it back thru the motor. Air that it pulls out is replaced by air that is pulled thru the tube from breather. If no suction the pressure has to go somewhere hence out the tube which is the path of least resistance. Be sure and read this twice as there will be a pop quiz on it tomorrow.LOL

cdowns · 12-02-2003, 08:42 PM

put on baffeled valve covers

72superBB · 12-02-2003, 08:58 PM

I replaced the pcv valve last week and the air filter when Igot the oil changed., so I know the vavle itself works. I will check to see if it is sucking in the morning (no pun intended). When I check the flame arrester, what am I checking for/

thanks

72superBB · 12-02-2003, 09:00 PM

What will baffled vavle covers do for the problem?

cdowns · 12-02-2003, 10:17 PM

with baffeled valve covers the oil will basically hit the baffels and drip back into the head instead of getting sucked out and into the carb

72superBB · 12-02-2003, 11:46 PM

ttt

Class of 69 · 12-02-2003, 11:56 PM

I'm with cdowns. Most aftermarket valve covers do not have baffles in them. Pull the metal tube out of the valve cover grommet and look down in with a light....if you see the head, pull those suckers off, and trash them. If you see a metal plate (baffle) then you may be looking at eccessive blowby.

72superBB · 12-03-2003, 04:01 PM

ttt

12-02-2003, 07:22 PM	#1
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	Please help! Have compression test results now Please help me with this post. thanks http://67-72chevytrucks.com/vboard/s...threadid=79272 here are the compression results ...............................firewall passenger side................................drivers side 155......................................................145 150......................................................150 160......................................................145 145......................................................140 ..........................water pump hope this helps anyone! __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB Last edited by 72superBB; 12-03-2003 at 04:05 PM.

12-02-2003, 07:31 PM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Interesting....does the engine burn any oil (blue smoke?) ? Maybe it is coming from that vent tube you have going from the valve cover to the air cleaner....is the inside of the tube all oily? Are you running a PCV valve? (the tube looks more like a vent tube....could be a big block PCV, i dunno) __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

12-02-2003, 07:34 PM	#3
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	There is a pcv valve on the other side. I was told the tube you see is called a flame arrestor (sp). It does smoke a tiny bit when started. What is in the picture is what happend after a 120 mile trip. __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-02-2003, 07:40 PM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	I would check the inside of the flame arrestor tube then....along with the inside of the PCV valve tube....they could be sucking in oil....just a guess __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

12-02-2003, 08:12 PM	#5
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Check your PCV valve to see if it working--pull it from valve cover with motor running and put you finger over the end of PCV --if working it will have a suction on it. If not you will build up pressure in crankcase from the blowby (air that is forced by piston rings when a cylinder fires) which forces oil mist up the tube into air cleaner. Where is the PCV hooked up to on carb? If hooked up right and it is working you have bad, broken or worn out compression rings. What the PCV valve does is create a suction inside the motor to pull out any blowby and run it back thru the motor. Air that it pulls out is replaced by air that is pulled thru the tube from breather. If no suction the pressure has to go somewhere hence out the tube which is the path of least resistance. Be sure and read this twice as there will be a pop quiz on it tomorrow.LOL __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

12-02-2003, 08:42 PM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	put on baffeled valve covers __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-02-2003, 08:58 PM	#7
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	I replaced the pcv valve last week and the air filter when Igot the oil changed., so I know the vavle itself works. I will check to see if it is sucking in the morning (no pun intended). When I check the flame arrester, what am I checking for/ thanks __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-02-2003, 09:00 PM	#8
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	What will baffled vavle covers do for the problem? __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-02-2003, 10:17 PM	#9
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	with baffeled valve covers the oil will basically hit the baffels and drip back into the head instead of getting sucked out and into the carb __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-02-2003, 11:46 PM	#10
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	ttt __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

12-02-2003, 11:56 PM	#11
Class of 69 Registered User Join Date: Mar 2003 Location: Stillwater MN Posts: 1,166	I'm with cdowns. Most aftermarket valve covers do not have baffles in them. Pull the metal tube out of the valve cover grommet and look down in with a light....if you see the head, pull those suckers off, and trash them. If you see a metal plate (baffle) then you may be looking at eccessive blowby. __________________ 69 GMC K10 ..some restoration required....still..

12-03-2003, 04:01 PM	#12
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	ttt __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB



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