Slipped Snapped Broken Timing Belt T-Belt [merged]

[aznerd11]

a few weeks ago, my car started idling poorly so i never started it since. i checked for vacuum leaks, but i then found it to be a problem with the timing belt. When i lifted the top cover, i noticed a rip on the belt and the belt off a few teeth on the exhaust sprocket. So now im in the process of changing it but now im stuck. Please see pictures.

rip
http://img.photobucket.com/albums/v387/bboygenius016/tbelt011.jpg

off teeth on exhaust
http://img.photobucket.com/albums/v387/bboygenius016/tbelt010.jpg

after 1/4 turn of the crank, the teeth lined up again, which made it skip some more
http://img.photobucket.com/albums/v387/bboygenius016/tbelt012.jpg

how do i get the timing to TDC with the teeth off?- i started turning it softly but then i felt a restriction and it moved itself counterclockwise.
also how do i get the crank sprocket off without the tool?
This is on a 90 laser turbo

 

[Mikael SS]

Ooo yeah, you don't want to do that. First thing is your valves are probably bent. Well at least some of them, and all probably on the same side. You need to check and make sure the valves are all sealing or have someone do that for you if you do not know how. Then if they are OK, you can put it back on the motor, or if the one you are using now is shot...on a new one. If you had a shop do the work on the timing belt, you should be able to return to them and have them answer for it. Then the above checks can be done by them. Did a shop do it for you? If so, was there any kind of guarantee?

I'll actually read the original post, then reply.




If the pistons are not too too bad, you CAN sand them down a little so you have no high spots, have the head surfaced, and install with a fresh gasket. Pics or a measurement of the pistons would help us determine that. Also, how many miles on the block? how does the block deck look?

 

[absolute_DSM]

Dont touch it. Take it back to the shop and make them fix it.

 

[Needsoles]

i already have a new head for ot. and a shop did not do it. my gf's dad installed it. and he felt bad for putting it on too tight so he bought me a new head. my engine has like 40k on it. i have one more question can i reuse my my head gasket. i have one of those multilayer metal head gaskets. and it has like 20 miles on it

 

[90laserRSfwd]

yes you can reuse your MLS head gasket. I did for my Mitsu one and it had like 40 miles on it. Here's what I did. First take a can of brake parts cleaner and spray the ENTIRE gasket (both sides) with the whole can. Then get s shop cloth (the orangish red one's Terry cloth I think there called) and whip down both sides. Make sure you hold the gasket by the edges so not to get the oils from your fingers on the surfaces that touch the block and cylinder head. Get some spray on gasket maker, I use a product called hitak it's a copper spray on in an aerosol can. just coat the gasket and engine with a decent amount and your set. It's worked awesome for me with no problems so far. One side note, I have the Mitsu MLS head gasket. NOT the cometic pos. If you have the cometic one god speed to you my friend. I'm not downing them, it's just that I had 2 cometic's leak. Let us know how you make out

 

[oldman420]

if he already bought you a new head you may as well get new pistons, rods, and bearings, maybe even a crank. Then throw all that in, make sure your timing is right this time and your good to go. Take this as a positive and understand that if it is all ripped apart right now you may as well do it right. I'll also re-iterate, dont let the girlfriends dad do the timing, do it yourself and if you dont know how flat bed it to a shop and get them to do it. It's a stupid way to wreck an investment, all it take is a little time and patience.

 

[bling5tatus]

New head should be fine to put on the car. Take the time and put the effort forth to do the timing yourself. If the lower timing cover isn't on, it makes it easier to do. Also, before anyone tries to jump my case about, "well how the hell do you set the ignition timing". I found a borked timing cover in the junk yard, and carefully cut off the part that had the base ignition timing marks on it. It's only held on by one bolt on my front cover... but you know what, it works just fine. You will feel a lot more confident if you know what you're doing... then when your car needs it next time you don't have to pay an arm and a leg for someone else to do it for you.

 

[Mikael SS]

if he already bought you a new head you may as well get new pistons, rods, and bearings, maybe even a crank. Then throw all that in, make sure your timing is right this time and your good to go. Take this as a positive and understand that if it is all ripped apart right now you may as well do it right. I'll also re-iterate, dont let the girlfriends dad do the timing, do it yourself and if you dont know how flat bed it to a shop and get them to do it. It's a stupid way to wreck an investment, all it take is a little time and patience.

horrible, horrible advice. why would he disassemble a good bottom end? and why would you ever buy a new crank? or rods? you dont "throw" those things in, you remove the block, disassemble, and spend hundreds of dollars at a machine shop to make them right.

 

[king_of_HTX]

Ooo yeah, you don't want to do that. First thing is your valves are probably bent. Well at least some of them, and all probably on the same side. You need to check and make sure the valves are all sealing or have someone do that for you if you do not know how. Then if they are OK, you can put it back on the motor, or if the one you are using now is shot...on a new one. If you had a shop do the work on the timing belt, you should be able to return to them and have them answer for it. Then the above checks can be done by them. Did a shop do it for you? If so, was there any kind of guarantee?

Did you even read the original post?

 

[oldman420]

sorry i read the original message wrong, i though when he broke his valves they wrecked his pistons. Yes, i would agree though if your pistons look fine just slap your head on and away you go. On the other hand if you did break one of your valves completely off then i would clean the bottom end to make sure their is no particulate lodged by your rings... and trust me mikael I know you dont just "throw" that stuff in my roomate just rebuilt his 420a (focker420) and it took him 3months and 2 machine shops to get his bearing clearances in accepatable spec.

 

[aceofriches]

yes you can reuse your MLS head gasket. I did for my Mitsu one and it had like 40 miles on it. Here's what I did. First take a can of brake parts cleaner and spray the ENTIRE gasket (both sides) with the whole can. Then get s shop cloth (the orangish red one's Terry cloth I think there called) and whip down both sides. Make sure you hold the gasket by the edges so not to get the oils from your fingers on the surfaces that touch the block and cylinder head. Get some spray on gasket maker, I use a product called hitak it's a copper spray on in an aerosol can. just coat the gasket and engine with a decent amount and your set. It's worked awesome for me with no problems so far. One side note, I have the Mitsu MLS head gasket. NOT the cometic pos. If you have the cometic one god speed to you my friend. I'm not downing them, it's just that I had 2 cometic's leak. Let us know how you make out

I WOULD NOT recomend Reusing a head gasket.... that could lead to further problems

 

[mrtalon40]

I WOULD NOT recomend Reusing a head gasket.... that could lead to further problems

really? I was thinking about re-using mines? I had pulled my cylinder head back off and I had only put 300 miles on the timing belt and head gasket!

 

[Yellow94]

Like I said in the topic, my timing belt broke. Ive pulled the head and found all 8 exhaust valves bent. The pistons got kissed but not enough to worry about. My question is, after the timing belt breaks do you guys just install new valves. Do you clean up the head and block and renstall, or do you rebuild the whole head. When I bought the car from my boss he said the engine was replaced and had 18,000. The place that installed it was a very shady, and I dont think they new much about the 4G63. I found a label on the the engine and its from a company called ATK engines. So im thinking at least the bottom end was done. I just need some input as to what you guys do. Its my daily driver so im leaving it stock. By the way it a 91 tsi fwd talon.

Thanks
Orlie

 

[GSXrestomod]

In my opinion.... you said the pistons were still in good shape so... Rebuild the head to keep it running properly and reliable. Bolt it all back up and have a good running stock car. Id rather be safe than sorry, and when dealing with DSMs I always take every precaution I can to make sure everything is done right the first time.

 

[ilikespeeding]

I'd get a cometic headgasket, ARP studs, 3G lifters, do a quick port and polish with new valves and call it a day.

 

[clipse4u2c]

if its been awhile since you did any maintenance you may want to replace the water pump and oil pump

 

[Yellow94]

Im gonna put a new water pump, and do the balancer delete. I found a head I might buy its from a company called J and C here is the link. eBay Motors: 2.0 MITSUBISHI ECLIPSE / TALON DOHC CYLINDER HEAD 4G63 (item 260253336541 end time Jun-29-08 08:12:56 PDT). What do you guys think about this head.

Thought about just rebuilding my head but it will cost me just as much as this head I want to buy.

later
Orlie

 

[USMCFieldMP]

Im gonna put a new water pump, and do the balancer delete. I found a head I might buy its from a company called J and C here is the link. eBay Motors: 2.0 MITSUBISHI ECLIPSE / TALON DOHC CYLINDER HEAD 4G63 (item 260253336541 end time Jun-29-08 08:12:56 PDT). What do you guys think about this head.

Thought about just rebuilding my head but it will cost me just as much as this head I want to buy.

later
Orlie

"If you want it done right, do it yourself"

I'd just rebuild the head myself, if it was me.

That eBay head looks legit. Make sure you read through their rules before you buy anything. That is a CORE BUY... meaning they want you to send your old head back to them.

 

[sighless]

what are the symptoms of a timing belt that has skipped?

would it be hard to start? like take a couple turns of the key before it starts up? and maybe sputtering/cutting out almost like a governor at higher rpms only under WOT?

 

[knochgoon24]

what are the symptoms of a timing belt that has skipped?

The timing marks won't line up. It loses some power if it's only one tooth.

More than that and you'll probably see at least one dead cylinder during a compression test from a bent valve.

 

[kabooski]

marks are lined up'
used Jay racing tool to align marks....
is this normal? or bent

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[99gst_racer]

Just a reminder- If you have an oil leak leaking on the t-belt, it will eventually saturate the belt, weaken the rubber, and cause it to delaminate and tear like this. Better to spend the time tracking down the leak before it causes the belt to fail, wiping out your cylinder head along with it. If your belt is always wet, don't put it off any longer!

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