Is it common

[kocherdeal]

ok so i loaded up the sandrail after a good trip ran perfect all day went to start it next day it wont start motor locked up back fired a couple times. I checked timing and one of the cams jumped about 10 teeth how could this happen? when i shut it off? when i started it? has this happened to anyone else?

 

[livedsm4g63]

It happens, time for a rebuild. Pistons are probably junk along with the valves.

 

[fullCircle]

pull the plugs... see if you have coolant in one or two of the cylinders. head gasket could of failed. cylinder(s) could have filled causing a hydrolock condition when you restarted it the next day.

 

[livedsm4g63]

pull the plugs... see if you have coolant in one or two of the cylinders. head gasket could of failed. cylinder(s) could have filled causing a hydrolock condition when you restarted it the next day.

He said he was 10 teeth off on his cam, A head gasket would be the least of his worries.

 

[fullCircle]

He said he was 10 teeth off on his cam, A head gasket would be the least of his worries.

true, but he will know the cause of it.

 

[livedsm4g63]

The head gasket doesn't cause your timing to slip. The hydraulic tensioner failing, or a stripped belt does. If its that far off timing i doubt it would start because there would be no compression because there could be gaping holes in the pistons.

Compression test to confirm.

 

[kocherdeal]

yeah i tested 2 cylinders and there was no compression

 

[fullCircle]

The head gasket doesn't cause your timing to slip. The hydraulic tensioner failing, or a stripped belt does. If its that far off timing i doubt it would start because there would be no compression because there could be gaping holes in the pistons.

Compression test to confirm.

A head gasket by itself won't cause the timing to slip, a blown head gasket could. as a hot engine that cools down, draws in coolant into the cylinder via the blown head gasket or fills it when it is still hot. if the piston is on it's up stroke and one of the valves is perfectly closed with the cylinder full of fluid, it could hold the valve/cam just long enough to jump teeth. it's call hydrolocking an engine.

I'm not saying that is exactly his problem but it is something to look at. i do agree with the rest of what you have said as being viable causes. ether way, it wont be a cheap fix unfortunately.

 

[livedsm4g63]

Time to take it apart. Keep us informed.

 

[kocherdeal]

ok well all 8 intake valves are bent thats why no compression, pistons dinged pretty bad but no holes! there was a little coolant in one of the cylinders but i could have been from pulling the head off not sure but checking the head for warpage anyways

 

[95blackGsTurbo]

Buying it and putting it in a rail is a blast of an idea but they require a lot of maintenance items when doing this since most rails on more full throttle than not. You can get by with a half worn timing belt on a daily driver. Not on a performance oriented vehicle like a rail.