I have a 66 Pontiac Ventura w/ 389 v8. My results was cylinder #2-160 #4-165 #6-160 #8-165 #1-165 #3-140 #5-145 #7-170. I did a wet test for cylinders #3 #5 cause of the concern of the diffents from the others results were #3-145 #5-150. I belive that means its not the pistion. I think that since all the others cylinders are about the same and that the #3 #5 are next to each other there is a leak between them in the head gasket. Any body know about this? What do you need to change the head gasket besides the gasket?
2006-12-20 08:30:53 · 9 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
try a cylinder leakage test. it can tell you if it's rings, valves,head gasket, or watever
2006-12-20 08:37:42 · answer #1 · answered by seabee12333@sbcglobal.net 2 · 0⤊ 0⤋
Cylinders #3 and #5 are lower than the others. A leak down test (compressed air through the spark plug hole with the piston at TDC) will be more accurate. It would test the valves also. You would be able to hear the air leak from the intake or exhaust side.
When changing out the head gasket, make sure the cylinder head and deck are perfectly flat.
2006-12-20 08:40:15 · answer #2 · answered by SP_Rider 3 · 0⤊ 0⤋
It May be the gasket like you say, but it also could be valve seat wear. if its a gasket you can do a "leak down" test which will allow you to hear the air hissing in the adjacent cylinder, verifying a gasket leak. If there is no hiss next door or air coming out the plug hole there is no gasket leak, then you know you need valve work
at any rate I would buy it just like it is , thats pretty good compression !
2006-12-20 08:37:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
i does not get excited basically yet, -- the finished severe compression accessible interior reason even, and ok so a procedures because it is going. yet another compression try in a while may coach diverse effects. yet i imagine you're ok at present! when I worked in storage, we did not do this "one turn compression" effects, - they are weak to a lot of variables that would throw you way off! a significantly better way will be to remove all the plugs, -spin the engine over some circumstances, and then shoot somewhat WD-40 in to each and each cylinder as you verify it, enable to coach 3-5 revolutions a minimum of! The WD-40 flushes sticky carbon and so on which could be conserving valves open basically the smallest quantity,- causing leakage, similar element with piston earrings! the superb verify yet woud be a "differential verify", - that's performed with a collection quantity of pressure getting into, and then compared to the quantity that's leaking out! that is likewise superb performed after operating engine with oil or "WD" in it for a dozen revolutions too to make confident no refuse is causing some thing to not completely "seat in position".in case you word not some thing unusual about how the vehicle runs, you're probaly basically fantastic, -and that i does not difficulty about it!
2016-12-01 00:31:05 · answer #4 · answered by england 4 · 0⤊ 0⤋
a intake gasket and exhaust but a norther thing is valve leak most of the time ween you have got a head gasket leak you can take the radiator cap off with motor ruining and you will see air bubbles in the radiator. make shear that you check the valves you could have a burnt valve or seat .
2006-12-20 08:45:03 · answer #5 · answered by master of none 3 · 0⤊ 0⤋
it could be the head gasket head or a cracked block or bad rings but i doubt it is the rings
2006-12-20 08:42:52 · answer #6 · answered by Kevin B 1 · 0⤊ 0⤋
yes gasket get a original one!!! remember to line it up care full
2006-12-20 08:39:24 · answer #7 · answered by Anonymous · 0⤊ 0⤋
That's not an abnormal spread. You're worrying about nothing.
2006-12-20 08:45:54 · answer #8 · answered by Nomadd 7 · 0⤊ 0⤋
looks good no problem
2006-12-20 09:42:19 · answer #9 · answered by russ G 3 · 0⤊ 0⤋