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Old 08-06-2013, 12:59 PM   #31
Haverhill Trade 1965
 
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99 blazer help


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Originally Posted by bostonwindows30 View Post
Just found out, no compression on 5 and 6 I am thinking the valves went, bad news need another engine...,.
How did you determine the two cylinders had no compression? Seldom would there be NO compression without something like a hole in the piston or cylinder wall. A proper compression test is done with, charged battery, all plugs removed, throttle open, and same number of compression strokes, usually 3 or 4, dry then wet, (second try with a squirt of oil in each cylinder), Bad rings would show an increase pressure with the oil. Another test is put compressed air into each cylinder @tdc and listen for air at intake, exhaust, oil filler, and radiator. It will isolate a problem with rings, valves, or head gasket, if blown into water jacket or oil passage.

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Old 08-06-2013, 04:32 PM   #32
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99 blazer help


So you think the valves are not running because of that??
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Old 08-06-2013, 05:48 PM   #33
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99 blazer help


I took to a mechanic
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Old 08-06-2013, 05:59 PM   #34
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99 blazer help


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Originally Posted by bostonwindows30 View Post
So you think the valves are not running because of that??
I cannot tell without being there. What I gave you is the orderly troublshooting procedure that will pinpoint or eliminate which component is the cause of compression loss. There may be other problems but you must eliminate this one if it is suspect. Nothing else will work properly without compression. Was a good compression gauge used to determine this?

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