timming problem

[mitsufrkr]

ok guys i have searched and searched but cant find an answer so here it gose. i had an auto shop put a new rebuilt head on my car along with T-belt and now they set the timing on it and tell me its ready. drive it and it loses timming i bring it back they check the timming sure enought the timing is off my question is what could cause it to lose timing like that. the car while they were working on it was missfiring but they fixed that but it just losses timming and is very hard i mean very hard to start. should i start looking for anouther motor. please help.

 

[SpeedFreak03]

Do you mean the timing belt jumps or base timing keeps being off? Sounds like the shop ####ed up when they installed the t-belt (if its jumping) is the tension set correctly?

 

[mitsufrkr]

their is no slack in the Timming belt , but it sounds like the base timming keeps on going out. if the belt jumps timming wouldent it bend valves, and i know their is no bent valves.

 

[crankbender]

ask them if they are referring to cam timing or just spark timing.

If they rotate the engine the wrong direction when rolling it over by hand you can skip teeth on the intake cam. Skipping teeth does not always cause the vehicle to bend valves.

Timing can also skip if the tensioner is warn out and they didn't check it. Or if they have the tensioner distance wrong. Both of these will not show slack in the tbelt.

 

[mitsufrkr]

when you say tensioner do you mean th tensionerpully bracket the tensioner arm or tensioner pully it self. also the auto tensioner.