420A 2gNT Timing belt (help)

[dsm1103]

96 talon n/t 420a

Other day i was driving and all of a sudden i heard what sounded like an exhaust back fire and my car shut off right away. Came to a stop and tried to start the car again, the starter spins but nothing. Looked in the timing belt cover, no belt. I haven't took anything apart yet and will be doing so this weekend. Can someone give me a heads up on what to check/look for meaning other damage? With the car shutting off right away does it mean i have a better chance at limited damage? Replies will be appreciated. Thanks

 

[92AWDHX40]

No belt definitley bent valves time to tear it apart, and replace everything timing side, it happens.

 

[LiquidX]

Agreed, more than likely you busted up most if not all your valves so you'll want to pull the head and send it to a machine shop to have them inspect it.

If the valves were bent you'll want to have the guides checked and replaced if damaged, valves replaced and seals. Hopefully there isn't much damage to the piston tops, if there are nicks, just sand them down to get rid of any high spots that may become a hot spot while driving.

 

[dsm1103]

How hard is it to replace valves? If i have just a few bent valves, do i have to replace all of them?

 

[92AWDHX40]

Replace whats bad how much work, i would have a shop do it.

 

[eclipsemaniac]

yeah i had a timing belt break. bent valves for sure.

 

[Empire1208]

You might as well rebuild the entire head... But you can rent tools at kragens if you wanna try and do it yourself. If you do decide to do it yourself, make sure you seat the "keeps/keys/retainers" properly and double check them by putting a "17mm"socket over the retainer and "tap it with a mallet to see if the "keys" stay in place.

goodluck on the project

 

[XiKeiyaZI]

Stop - Stop giving one sided information.

Where are the cam dowels pointed? If you look around the Bolt on the end of the Cams, you'll see a small hole with a pin in it. About what position are they at? Use a clock and it's time placement for reference - IE : 1:00 - 4:00 - etc.

 

[Diamond Star Werks]

You might as well rebuild the entire head... But you can rent tools at kragens if you wanna try and do it yourself. If you do decide to do it yourself, make sure you seat the "keeps/keys/retainers" properly and double check them by putting a "17mm"socket over the retainer and "tap it with a mallet to see if the "keys" stay in place.

goodluck on the project

Umm I'm not so sure that's the best way to test if the keepers will stay in place as I place a socket over it and hit it to get the keepers out. Be better to place the valve over an edge and hit it (not really hard) with the hammer on top of the valve if your going to do this. Pm me if you need a head.

easiest way to be positive about bent valves if you can do this. Re-install new timing belt. Get all timing marks right. Take a compression tester and screw in the part that goes into the spark plug holes and then attach an air line to it and rotate the engine. If it stops blowing out the ports all together you know that set of valves are good in that cylinder. This is somewhat more accurate than doing the compression test. And if you don't want to remove the head this will affirm if you have to or not. only other way besides the compression test is checking the dowel pins as mentioned. Check dowel pins FIRST then if they look good then do what I just said.

 

[bryanwheat]

Umm I'm not so sure that's the best way to test if the keepers will stay in place as I place a socket over it and hit it to get the keepers out. Be better to place the valve over an edge and hit it (not really hard) with the hammer on top of the valve if your going to do this. Pm me if you need a head.

easiest way to be positive about bent valves if you can do this. Re-install new timing belt. Get all timing marks right. Take a compression tester and screw in the part that goes into the spark plug holes and then attach an air line to it and rotate the engine. If it stops blowing out the ports all together you know that set of valves are good in that cylinder. This is somewhat more accurate than doing the compression test. And if you don't want to remove the head this will affirm if you have to or not. only other way besides the compression test is checking the dowel pins as mentioned. Check dowel pins FIRST then if they look good then do what I just said.

You can actually have a very slight bend in the valve and it will still seal in the seat because of the play in the guide and the stem flexing. The only 100 percent correct way to tell is to pull the head, and check them with a dial bore gauge. You can also slide the valve in and turn it while looking thru the port. If it is bent than you will have daylight coming thru, and the location will move when you turn the valve.

 

[DeadlyScone]

You can actually have a very slight bend in the valve and it will still seal in the seat because of the play in the guide and the stem flexing. The only 100 percent correct way to tell is to pull the head, and check them with a dial bore gauge. You can also slide the valve in and turn it while looking thru the port. If it is bent than you will have daylight coming thru, and the location will move when you turn the valve.

instead of looking for daylight couldn't you just pour water in the port or some other liquid and see if it comes out the top? never pulled a head but just wondering.

 

[Peterbeter]

People do get lucky when their belt breaks, so definitely check. I bought my car and the teeth around the crank had worn off, so it didn't spin the belt. I just assumed bent valves without bothering to check and I wound up doing a whole rebuild when I could have gotten away with just a timing belt kit.