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no compression out of ideas

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Old 12-28-2013, 03:06 PM
green-machinellc green-machinellc is offline
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Default no compression out of ideas

Ok ima be very thorough here.
Truck ran fine one day not at all the next, 0 compression On pass side 130 On drivers side. Put new head gasket On assuming that was it. Now I have both valve covers off along with timing cover. Crank sprocket dimple is at 6 o'clock and Tdc was confirmed with screwdriver in number 1 spark plug hole. Idler timing gear dimple at 12 o clock, cam sprocket v8 marks at 12 o'clock The only thing not aligned is the plated links On chains. Now none of my cylinders have compression pass side or drivers side. Any ideas would be loved
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Old 12-28-2013, 03:29 PM
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Sounds like your timing is incorrect. Your #1 piston has two strokes. Intake and Exhaust. Is it possible you marked it on the wrong stoke? Meaning 180* out?
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Old 12-28-2013, 04:35 PM
green-machinellc green-machinellc is offline
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Quote:
Originally Posted by dirtydog View Post
Sounds like your timing is incorrect. Your #1 piston has two strokes. Intake and Exhaust. Is it possible you marked it on the wrong stoke? Meaning 180* out?
Just moved crank sprocket one full revolution and put dimple back at 6o'clock, this put the v8 marks at 6o'clock instead of 12 o'clock so I took chains off and put v8 marks back to 12 so now should be 180 out from what it just was, tried again still no compression
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Old 12-28-2013, 05:25 PM
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Are you sure you didn't jump cam timing?
Check the timing manually and verify that when the #1 piston is at TDC, that both the valves are closed. And when the piston is falling in the sleeve, the exhaust valve is opening. This can be used for all cylinders, but since #1 is the timed mark, it'll help better. The intake valve should be shutting when the piston rises in the sleeve. Both valves are only closed for a very short duration.

I'm assuming you have a Hemi, which is pretty basic for timing lucky enough for you.
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Old 12-28-2013, 06:23 PM
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What you did was only go 90* out since the crank spins twice for only 1 cam revolution

Looked up the 5.7L in the Service Manual

CAUTION: The camshaft pin and the slot in the
cam sprocket must be clocked at 12:00. The
crankshaft keyway must be clocked at 2:00.
The crankshaft sprocket must be installed so that
the dots and or paint marking is at 6:00.

Just make sure you put the crank back the right way, not 180* out.
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Old 12-28-2013, 06:23 PM
 
 
 
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