timing belt

[wbrigante]

I was doing about 80 when my car just shut down. I know it is the timing but the problem is i do not know what could i have damaged? when you turn the key the crank will spin but the cams do not move. I am just looking for a heads up on the worst case scenario? the belt aroud the cams do still feel tight but will be pulling the timing cover off today to check the belt first.

[BogusSVO]

So you broke the time belt at 80mph... I will say you now have bent valves and cracked guides, you need another head or do a full rebuild on the head you have now.

How to Have a 4G63 head rebuilt.

How to change Valve guides In a 4G63T head

[andrew k]

worst case scenario you might have grenaded the whole motor. interference type engine. you were at 80 you were running 3k plus rpms at load. engine tear down and inspect would be step 1 then go from there. check for cracked, dented, or marred pistons as well. the head is surley toast.

[gotmyeclipse]

That sounds bad. i had my GF's brother in law replace my timing belt at 135k miles and fortunately it didnt snap. hopefully you get to fix yours.

[banshee88]

Time for a complete rebuild

[DSM1G90]

He still has the belt on ... He didn't mention of any other motor noise - like metal against metal with pistons banging against something..when he hit the key.

Wonder if he just jumped time to kill compression...just enough where no valves are touched.

[RayBan GST]

before you hear our comments , just answer us if the belt is broken or not ? did you open the belt cover to check it first ? if the belt was broken at 80 mph then just follow BogusSVO post and you will not go wrong.

[toppertopper]

He said the cam's don't move ,so the belt must still be on ..
Does the belt spin but the cam's dont move ? give us more info

[1983gsp]

Pull the valve cover and rotate the cams. Check for any loose cam followers. If any are loose you can be assured of some bent valves. If everything looks good, replace the timing belt and check compression. If the Compression is good, fire it up. I've broken two timing belts and came out lucky. You might have too.

[xxNocturnalxx]

Last belt that I worked on had teeth/cogs missing all over the place, the crank would turn but the cam gears didn't move. Threw a new belt on and it was good to go, pretty dang lucky.

[RayBan GST]

i would say lets wait for his answer he might be lucky

[wbrigante]

Ok the belt did not completely break but it did lose teeth. I rotated the cams to see if they would still line up and they seem to line up good. I never heard any metal noises when the car shut down.

[wbrigante]

final out come damaged cam, valves, rocker arms all on the exhust side small marks on top of pistons but they are all good

[DSM1G90]

Wow .. something got in the way of the cams on that 420A to stop them to get the belt at the crank end all chewed up like that.

Since you turboed that 420A, wonder if too much compression where something it found a weak spot causing things to just give away ....

[uncle ben]

Might want to check the oil pump also. Ive seen them lock up and strip teeth from the belt like that.

[wbrigante]

all of that is fine

i was pushing 8 psi of boost

[Riceburning101]

My friends balance shaft belt snapped. T belt jumped at the crank and raped the teeth off the t belt like that when it tried to grip on the crank pulley again but that was a 4g63. Either something got in there or crank didn't want to rotate. Possibly a bad tensioner or you didn't keep up with adjusting the tensioner since they aren't hydraulic.

[dsm_94_4ever]

Had the same thing happen on my N/A 94 eclipse got lucky I had just pulled off the road and it did it at idle took my head off valves were good pistons were fine put everything back together and drove it for two more years after that with no problems then sold it.

[bryanwheat]

Originally Posted by uncle ben

Might want to check the oil pump also. Ive seen them lock up and strip teeth from the belt like that.

The oil pump is driven by the crank and not the timing belt so that is not the issue.

Originally Posted by wbrigante

Ok the belt did not completely break but it did lose teeth. I rotated the cams to see if they would still line up and they seem to line up good. I never heard any metal noises when the car shut down.

You seem to have an oil leak on the timing side which could contribute to this. Oil on the belt will cause the rubber to get weak.

[iugrad92turbo]

Replace that belt and the timing, all your timing devices.

[tametalon92]

belt delamination from an oil leak at the front main seal or the oil pump housing. if you got the scratch, id do a full rebuild now. youre going to want to pull it apart to look at the pump and seals.

[fourgsixthree33]

Originally Posted by wbrigante

I was doing about 80 when my car just shut down. I know it is the timing but the problem is i do not know what could i have damaged? when you turn the key the crank will spin but the cams do not move. I am just looking for a heads up on the worst case scenario? the belt aroud the cams do still feel tight but will be pulling the timing cover off today to check the belt first.

Once, my girl friend was driving her 1G TSi AWD on the highway at 70mph. Timing belt broke. Everything was pulled off and inspected. The ONLY thing that needed replaced was the timing belt. Needless to say, she knows she was lucky as hell. Not many people can snap a timing belt at idle without bending valves.

[camaroz89]

Originally Posted by wbrigante

final out come damaged cam, valves, rocker arms all on the exhust side small marks on top of pistons but they are all good

ouch but not to bad! not sure if 1g cams are the same but i have everything for a 1g head im not using on my build.