I recently added worlds heads to my setup (complete and new) and after a month of driving it the car stalled under hard accelleration. It still turns over good, has good spark, fuel is good and timing is still right on. There is no slack in timing chain but I originally thought it was a timing or computer issue because there was no engine noise and it just simply stalled and wouldnt start. Couldnt find a smoking gun anywhere so did a compression test and there is no compression on any cylinders and a leakdown had air coming out of both the intake and the exaust. I would suspect valves or rings, but is it common to have them all go at once? Something tells me I am missing something with timing but not sure where to go next.
Thanks for any help
DOES THIS MAKE SENSE?
- Thread starter leon_reynolds
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Pull the rocker covers and crank the engine. Watch to see that the valves move. Then loosen all the valves until the rockers are loose. Then readjust the valves & test the compression.
I did remove driver side valve cover to check and the valve lash is good and everything seems to be in fine working condition from the topside........that is why I was curious about anything else that would throw off all the cylinders at once. Pistons are still moving so the crank is still rotating and distributor is still showing tdc #1. any other ideas??? Is is possible for the timing chain to slip and get another bite throwing off timing?
ls1beater4eva
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whtpny
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I am running arp head studs but they seems to be fine....guide plates are still tight. Is it possible for the crank to have rotated 180 degrees? A friend just came over to check things out and said it might be possible for the keyway that holds the timing chain to have given out but then snag again causing the engine to rotate and valves to function but of course without proper timing to fire........has anyone ever experienced this or think it is even credible? Thanks for all the help.
Maybe you could rotate the crank via the balancer bolt and when the balancer is at "0" the spark plug number that the rotor in the distributer is pointing at should be at TDC (on the compression stroke)...if it's not, then it's not in time. It's usually easier to rotate the engine w/ the spark plugs removed, but I did it today w/ them in because I have P heads and it's a pain in the ass to pull them out.
FORCED2DV8
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FORCED2DV8
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You could always remove the rocker arms on a cylinder so the valves stay shut, And then test compression, determine wether its the rings/ head gasket. If you get compression, then you know it has to be the cam or timing issue letting one of the valves stay open on the compression stroke.
good luck with it..
good luck with it..
Thanks for all the ideas. I have made sure the engine is at tdc and the rotor is pointed correctly in the distributor. It all checks out good. I like the idea of undoing the rocker arms to see if it goes past the piston so I will do that tommorrow but then again that would mean every cylinder I tested (5 with no pressure) blew rings at the exact same moment.......seems unlikely. Is there anything that anyone knows about that would affect every cylinder similar to timing? That is why I was curious if the crank itself could rotate within the engine so that everything would still line up on the surface showing good timing but internally everything is 180* off. Thanks again for all the help.
ok, just checked #1 and #5 cylinder by removing rocker arms so the valves shut and then doing a leakdown and wouldnt you know......they held pressure......now I am confused. rings are holding and the valves were off timing somehow but how can all of the valves suddenly jump timing? My timing chain is nice and tight and everything else looks good. I need someone alot smarter than me to think about this one.......
ok so you got compression, is the rotor turning when the motor turns. i have read a couple thread lately stating that the pin on the distributor gear broke off and doing this sort of thing. even though it may not look broken, the pin just might be broken in 3 parts.
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