No compression after timing belt change!!
Jun 24, 2015, 06:00 PM
#1
No compression after timing belt change!!
The belt did not break... Car ran fine until i took all the serpentine components off to pull the lower timing cover to spot a leak.... Put all the components back on and must have made the timing belt jump a tooth in the process of loosening the crank pulley...
Cams were TDC and the crank was at TDC... Put the belt on and rotated about 6 full turns... All the marks were lined up and didn't feel any real resistance like valves hitting. so i went to start it and noticed it was way to easy to crank with no start... Pressure tested 1 and 3 cylinder and cylinder 1 had 30 and 3 had 0...
Now i do know i had to rotate the crank 90 degrees from TDC in order to rotate the intake cam to TDC... once there i rotated the crank back to TDC.... I then only had to turn and keep pressure on the intake cam in order to get it to stay at TDC.. The exhaust cam just rested there perfectly..
Did i bend some valves or is the timing somehow not correct and thats why I'm getting no pressure?
Is there some how i am maybe 180 degrees off or something?
Cams were TDC and the crank was at TDC... Put the belt on and rotated about 6 full turns... All the marks were lined up and didn't feel any real resistance like valves hitting. so i went to start it and noticed it was way to easy to crank with no start... Pressure tested 1 and 3 cylinder and cylinder 1 had 30 and 3 had 0...
Now i do know i had to rotate the crank 90 degrees from TDC in order to rotate the intake cam to TDC... once there i rotated the crank back to TDC.... I then only had to turn and keep pressure on the intake cam in order to get it to stay at TDC.. The exhaust cam just rested there perfectly..
Did i bend some valves or is the timing somehow not correct and thats why I'm getting no pressure?
Is there some how i am maybe 180 degrees off or something?
Last edited by marinejensen; Jun 24, 2015 at 07:19 PM.
Jun 24, 2015, 07:18 PM
#2
If the crankshaft is at TDC and the cams are on the marks and stay on the marks when the engine is turned over, the timing is correct. If there is no mechanical compression, that could mean several things, but the most likely scenario is not the one you want to hear. Pop the valve cover, verify that all valves and lifters have appropriate action when the engine is turned, and check that the spark plugs haven't been loosened. If all seems in order, make plans to remove the head and have a look at the valves.
Jun 24, 2015, 07:41 PM
#4
If the crankshaft is at TDC and the cams are on the marks and stay on the marks when the engine is turned over, the timing is correct. If there is no mechanical compression, that could mean several things, but the most likely scenario is not the one you want to hear. Pop the valve cover, verify that all valves and lifters have appropriate action when the engine is turned, and check that the spark plugs haven't been loosened. If all seems in order, make plans to remove the head and have a look at the valves.
THANKS FOR THE HELP! Im no noob at this but not an expert by any means... I just know about stuff i have had to fix ..... and its been a lot of stuff lol
Jun 24, 2015, 08:00 PM
#5
Like I said, pop the valve cover and have a look there first. If you've not touched the cams or spark plugs, and everything under the cover is correct and functional, that points to the valves. It just takes one engine revolution with a mis-timed cam to bend a handful of valves.
Jun 24, 2015, 08:07 PM
#6
Like I said, pop the valve cover and have a look there first. If you've not touched the cams or spark plugs, and everything under the cover is correct and functional, that points to the valves. It just takes one engine revolution with a mis-timed cam to bend a handful of valves.
Will do thanK you sir!
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Jun 30, 2015, 07:30 AM
#9
Like I said, pop the valve cover and have a look there first. If you've not touched the cams or spark plugs, and everything under the cover is correct and functional, that points to the valves. It just takes one engine revolution with a mis-timed cam to bend a handful of valves.
Jun 30, 2015, 07:45 AM
#10
Nothing changes TDC at the crank. Where the cams are set has no bearing on that. When the crank timing mark is at TDC, there is a timing mark on the outside edge of each cam gear that must line up with the corresponding marks on the valve cover. If these marks don't line up, the timing gear is out of whack.
Adjusting the cam timing means turning the inside hub to which the cams are attached while the cam gear itself remains stationary and on its TDC marks.
Adjusting the cam timing means turning the inside hub to which the cams are attached while the cam gear itself remains stationary and on its TDC marks.
Jun 30, 2015, 09:06 AM
#11
Nothing changes TDC at the crank. Where the cams are set has no bearing on that. When the crank timing mark is at TDC, there is a timing mark on the outside edge of each cam gear that must line up with the corresponding marks on the valve cover. If these marks don't line up, the timing gear is out of whack.
Adjusting the cam timing means turning the inside hub to which the cams are attached while the cam gear itself remains stationary and on its TDC marks.
Adjusting the cam timing means turning the inside hub to which the cams are attached while the cam gear itself remains stationary and on its TDC marks.
Jul 6, 2015, 04:32 PM
#13
Nothing changes TDC at the crank. Where the cams are set has no bearing on that. When the crank timing mark is at TDC, there is a timing mark on the outside edge of each cam gear that must line up with the corresponding marks on the valve cover. If these marks don't line up, the timing gear is out of whack.
Adjusting the cam timing means turning the inside hub to which the cams are attached while the cam gear itself remains stationary and on its TDC marks.
Adjusting the cam timing means turning the inside hub to which the cams are attached while the cam gear itself remains stationary and on its TDC marks.
Crank tdc
Intake
Exhaust
Tdc
It's cool I can take it..