Unsuccessful BC Cam install - NEED INPUT
07-13-08, 04:05 PM
#17
Sounds to me like you guys didnt get the timing marks set up correctly when installing everything. Im 99.9% sure you starter trick didnt hurt the engine (unless you had the belt or tentioner off as previously stated). I have done the starter trick a hundred times with no problems. Either way, ouch.
07-13-08, 09:03 PM
#21
Are you sure you lined up the crank pulley and the timing marks on the cam gears correctly when you put it back together? Obviously they were on correctly at the point where you broke the crank pulley free as the car ran up until that point.
The crank pulley can be off 180 degrees from the cams if you aren't careful when you line them back up. you should ALWAYS crank the engine over by hand with a wrench before you try to start it up when doing work on the head involving timing. If you had made it far enough to have the motor back together without damaging anything it would have been instantly apparent there was an issue as soon as the crank stopped turning easily by hand.
Secondly, when you installed the cams are you sure you had the lobes in the right location on each respective cylinder? If you installed the cams without following the factory installation order you were probably out of time to begin with. By turning the cams by hand to get the timing marks to line up with that of the crank pulley you could have had valve to piston contact right there before you even had the timing belt back on.
If I had to bet on it I would say whoever did the actual install of the cams didn't line up the lobe orientation correctly before they tightened the cams down and by turning them or turning the crank pulley to get the timing marks to match lined them up so they were both at the timing marks but one of them was one revolution out of time, that would cause piston/valve contact as soon as the motor is turned over.
The crank pulley can be off 180 degrees from the cams if you aren't careful when you line them back up. you should ALWAYS crank the engine over by hand with a wrench before you try to start it up when doing work on the head involving timing. If you had made it far enough to have the motor back together without damaging anything it would have been instantly apparent there was an issue as soon as the crank stopped turning easily by hand.
Secondly, when you installed the cams are you sure you had the lobes in the right location on each respective cylinder? If you installed the cams without following the factory installation order you were probably out of time to begin with. By turning the cams by hand to get the timing marks to line up with that of the crank pulley you could have had valve to piston contact right there before you even had the timing belt back on.
If I had to bet on it I would say whoever did the actual install of the cams didn't line up the lobe orientation correctly before they tightened the cams down and by turning them or turning the crank pulley to get the timing marks to match lined them up so they were both at the timing marks but one of them was one revolution out of time, that would cause piston/valve contact as soon as the motor is turned over.
Last edited by macd7919; 07-13-08 at 09:09 PM.
07-14-08, 06:24 AM
#22
Are you sure you lined up the crank pulley and the timing marks on the cam gears correctly when you put it back together? Obviously they were on correctly at the point where you broke the crank pulley free as the car ran up until that point.
The crank pulley can be off 180 degrees from the cams if you aren't careful when you line them back up. you should ALWAYS crank the engine over by hand with a wrench before you try to start it up when doing work on the head involving timing. If you had made it far enough to have the motor back together without damaging anything it would have been instantly apparent there was an issue as soon as the crank stopped turning easily by hand.
Secondly, when you installed the cams are you sure you had the lobes in the right location on each respective cylinder? If you installed the cams without following the factory installation order you were probably out of time to begin with. By turning the cams by hand to get the timing marks to line up with that of the crank pulley you could have had valve to piston contact right there before you even had the timing belt back on.
If I had to bet on it I would say whoever did the actual install of the cams didn't line up the lobe orientation correctly before they tightened the cams down and by turning them or turning the crank pulley to get the timing marks to match lined them up so they were both at the timing marks but one of them was one revolution out of time, that would cause piston/valve contact as soon as the motor is turned over.
The crank pulley can be off 180 degrees from the cams if you aren't careful when you line them back up. you should ALWAYS crank the engine over by hand with a wrench before you try to start it up when doing work on the head involving timing. If you had made it far enough to have the motor back together without damaging anything it would have been instantly apparent there was an issue as soon as the crank stopped turning easily by hand.
Secondly, when you installed the cams are you sure you had the lobes in the right location on each respective cylinder? If you installed the cams without following the factory installation order you were probably out of time to begin with. By turning the cams by hand to get the timing marks to line up with that of the crank pulley you could have had valve to piston contact right there before you even had the timing belt back on.
If I had to bet on it I would say whoever did the actual install of the cams didn't line up the lobe orientation correctly before they tightened the cams down and by turning them or turning the crank pulley to get the timing marks to match lined them up so they were both at the timing marks but one of them was one revolution out of time, that would cause piston/valve contact as soon as the motor is turned over.
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