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#1 |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
Posts: 1,465
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Dead Cylinder question 350
I have a 350 that has a dead cylinder compression wise. It is a crate motor with about 20000 on it. The guy that had it before me put a new cam in it and just never finished it up. What could be causing this Problem Any ideas??? The motor runs. I dont think it should be anything big. I was thinking maybe a head problem or push rod
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1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() Last edited by jbristo67; 03-01-2009 at 07:27 PM. |
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#2 |
Saving 1 truck at a time!
Join Date: Aug 2001
Location: Kent, WA
Posts: 6,465
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Re: Dead Cylinder question 350
It could be a flat lobe on the cam. What was the compression in that cylinder? Did you take the valve cover off to check the movement on the rocker arms on that cylinder? This would be a good second step.
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'68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary) |
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#3 |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
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Re: Dead Cylinder question 350
Thanks for the direction I will get after it
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1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() |
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#4 |
All stock and staying that way
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Most probable is a valvetrain issue. Worst case could be a hole in the piston.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... ![]() 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... ![]() 2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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#5 |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
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Re: Dead Cylinder question 350
How do I go about trouble shooting a valve train issue
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1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() |
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#6 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Dead Cylinder question 350
Did you ever take the valve covers off to see if all the valves were moving the same amount? Have you done a compression check to see which cylinder it is? We just a need a little more info to help you properly.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! |
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#7 |
sharp as a marble
![]() Join Date: Jan 2007
Location: atlantic beach,florida
Posts: 1,082
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Re: Dead Cylinder question 350
pull valve cvr and check movement of rockers to ck for worn cam lobe.
If you can put compressed air in the cylinder and listen to where it is going. IE if you hear it hissing thru the carb I would suspect an intake vavle problem. Thru the exhaust, and exhaust valve problem. Thru the valve cover would indicate a ring problem Last edited by cparman; 03-01-2009 at 08:58 PM. |
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#8 |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
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Re: Dead Cylinder question 350
No a buddy of mines dad is the one who did the compression check. I havent gotten my hands on the motor yet. My buddy was just wanting to sell it to me for a 100 and with as low miles as it had on it I thought it could be a really good deal on a good motor if it was nothing major.
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1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() |
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#9 | |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
Posts: 1,465
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Re: Dead Cylinder question 350
Quote:
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1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() |
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#10 | |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: Dead Cylinder question 350
Quote:
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 03-01-2009 at 09:07 PM. |
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#11 |
Registered User
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
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Re: Dead Cylinder question 350
Pass that engine up.
Do you happen to have your friend's name & number handy? ![]()
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85' CUCV M1009!!! The newest addition! 6.2diesel, Th400, NP208, & only 36k miles! 70' C-10 LWB Fleetside - Looking good these days! ![]() 05' Dodge Neon 88' Winner Escape Sport 1750 - 4.3v6 94' Seadoo SP 84' Honda TRX200, bare nekkid. Just a frame & tires. Always looking for another project or any good deal! ![]() |
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#12 | |
Gone to greener pastures
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Re: Dead Cylinder question 350
Quote:
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'69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck |
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#13 |
resident oilfield trash
Join Date: Jan 2009
Location: Lubbock TX
Posts: 1,465
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Re: Dead Cylinder question 350
You just mad me lauph out loud
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1967 SWB C10 396/400 factory air factory tach (sadly had to send to a new home) 1986 Honda 70 Fourtrax 1991 Chevrolet K5 blazer 2wd 1982 Mastercraft Pro Star 190 Stars and Stripes 2002 Chevrolet Tahoe 2011 Nissan Armada ![]() |
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#14 |
Registered User
Join Date: Jan 2007
Location: Elberta,Ala
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Re: Dead Cylinder question 350
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