Timing Keeps jumping need help

[kiknturbo17]

Ok heres the problem,a couple months ago i bent valves....didnt know how it happened. So then i get new valves,valve seals,and get the head completely redone. Get some arps and a mls hg and a new tensioner just in case. Put everything back together get it running finally and it ran awesome for a couple days until i went to leave work and nothin....it just keeps cranking.Get it home and my dad looks at it and says i bent valves again...Now i have no clue how it keeps doing this, and the wierd thing is that this is somehow happening upon start-up. Both times ive gone to start it and nothin it jus keeps cranking....Im am running out of ideas anything you guys can think of i would appreciate a ton. Thanks
Joe

 

[boostyGST]

only real way it can happen during start up is if the timing belt is jumping off the cam gears a couple of teeth, meaning that either you timing belt is worn out, lose, or your auto tensioner is done for and not doing its job and keeping that belt tight. It does not take much to bend a valve on these motors considering they are inference type engines.

I think the tolerance it has is off 3 teeth on intake and only 1 tooth on exhaust.

Look @ the cam gear timing marks and see if they are off, if so, you know that the car jumped time because of the timing belt.

Tyler

 

[Joesmoke]

Until the timing belt is checked and verified that it skipped so badly that you bent the valves while you were cranking it over, my say is that it is something else.

Don't get me wrong, it may have happenned, its just that a not starting problem after the car was running well, could be many other things.

Good luck, and look for the simple things 1st. (HINT:Fuel and spark)

 

[huafist]

Two words: Compression test.

If your father says you bent valves, chances are he's already done one (he couldn't know you bent valves if he didn't). Typically if you come up with 0 psi in a cylinder it has bent valves.

When you replaced the auto tensioner, did you replace the idler pulley and the timing belt as well? Do you have balance shafts? If so, did you replace the balance shaft belt as well?

 

[diambo4life]

Personally, I wouldn't have thrown a brand new head on the car BEFORE finding out why the car jumped timing in the first place. Give some feedback on the questions posed to you and you can be assisted further.

 

[bullettdsm]

Ok heres the problem,a couple months ago i bent valves....didnt know how it happened. So then i get new valves,valve seals,and get the head completely redone. Get some arps and a mls hg and a new tensioner just in case. Put everything back together get it running finally and it ran awesome for a couple days until i went to leave work and nothin....it just keeps cranking.Get it home and my dad looks at it and says i bent valves again...Now i have no clue how it keeps doing this, and the wierd thing is that this is somehow happening upon start-up. Both times ive gone to start it and nothin it jus keeps cranking....Im am running out of ideas anything you guys can think of i would appreciate a ton. Thanks
Joe

As I read throught this quite I can still find nothing about replacing the timing belt. I do hope that you did replace it? If not, do. If you are REALLY sure that you jumped timing AND your valves are bent then you might want to be sure that the tensioner was done properly. There are numerous write ups on this and, if you have a Haynes/Chiltons book, the info will be there. If set to the wrong tension the tensioner can keep the belt on for a bit but torque action can spin it off (i.e sitting cold then a quick spin by the starter). This is not that hard to get wrong. I have done quite a few T-belts and I had this happen to me. Fortunately, I hand-crank test each one that I do and it spun out by hand. Just had to reset. Find out problem BEFORE you try again.
MB

 

[kiknturbo17]

Well i appreciate all the comments guys,the other day me and my friend looked at everything before taking it apart. To answer the questions you guys asked,it is a new belt,new auto tensioner,the only thing i didnt replace was the tensioner pully. Also the balance shafts are removed so no need for that belt. After looking everything over, we discovered exactly was bulletdsm just said. The tension was set wrong, which was set by my dad. Now i get to have my head redone one more time. Get everything back together and then its getting sold because i found an awesome deal on a super clean 93 awd. Thanks again guys

 

[Turbo Talon DL]

Have your Pops take a look here ====>>>> www.vfaq.com <<<<==== Look at the timing belt write-up. I've done my timing belt 3 times in the 10 days I've had the car running due to oil leaks. It didnt skip on me and I took the car up to 7000 very briefly. What kind of timing belt did you buy? How do you set the tension wrong?

 

[DSM Storm]

I hope you guys set the gap properly. These cars like to be gapped around .150 - .180" ; I like to keep mine gapped around .150. Ive done many many DSM's this way with no issues. I have seen people set the gap improperly and have a problem 500 miles down the road. I always replace the tensioner and pulleys. The extra money in parts is well worth the peace of mind. Im sure what he means by setting the tension wrong is setting the gap wrong. This is a key factor in TB replacement.

Storm

 

[gsxtacy]

Special "Mitsubishi" Tensioner Tool comes to mind for setting that "gap" properly.

Right?

gsxtacy