HELP my timing belt shredded!

[kt239]

I am waiting for aaa at the moment because my timing belt got tore up on my way home. I wanted to get the communities input as to how screwed I am so here's what happened. I was cruising at 65 on rt376 and I herd what sounded like road debris under my vehicle. The motor shut down and I pulled to side of the road to see what was the problem and saw my timing belt town up half way. I heard no clunking or obvious signs of valve hitting piston. I want to put my spare oem timing belt on when I get home but here's my question... If my timing marks are all good and lined up there should be no issues correct? As dumb a question it may be I just want to be sure.

 

[XiKeiyaZI]

Absolutely not.

1 : Did you try to turn the engine over again? (Be truthful)
2 : Where are the cam dowels pointed at, right now?
3 : Turn the engine over at the crank, clockwise, plugs out. Do you run into any sudden stops?
4 : Do a compression test with the cam dowels at 12:00. How's it look?
5 : Pull the valve cover off, check the rockers. Are any dislocated?

Follow up on this and get back with us. The chances are - you bent some valves. However - it's rare but you may be safe depending on how the results/answers to the above questions check out. When I shredded my belt, the cam dowels were at 12:00 - so my valves were saved. Most of the time time this is not the case. As such - if you just toss another belt on without confirming there are no bent valves then you're likely going to damage more than you're willing to fix.

For best measure, regardless of any other advice you get in this thread, the best and sure fire way to check for damage is to just Pull the head.

 

[Boomdeeze]

If you were going 65 and your timing belt broke, I would bet that some valves hit before the car died. Do what XiKeiyaZI said and then report back, we will be able to help out with more information.

 

[kt239]

1. No I am far to scared to try turning it over I refuse to cause any more damage then there potentially is.

2. Cam dowels are at...

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3, 4, 5. I am still waiting on aaa and will be reporting in for work after car is dropped at my house so I will post results after work for that.

At step 3 if there's any stoppage I should prob just not proceed any farther I'd assume?

 

[ed1380]

Yes. If you feel sudden resistance that's a valve, but if you don't then you're still not in the clear. You would need a compression test

 

[XiKeiyaZI]

1. No I am far to scared to try turning it over I refuse to cause any more damage then there potentially is.

2. Cam dowels are at...

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3, 4, 5. I am still waiting on aaa and will be reporting in for work after car is dropped at my house so I will post results after work for that.

At step 3 if there's any stoppage I should prob just not proceed any farther I'd assume?

1 : Good boy.

2 : That... is very discouraging. Valves are open here. From the looks of it, the belt skipped on the intake cam, so the intake looks to be several teeth off. I'm willing the bet that the exhaust is perfectly in place and that you have a about 4 bent valves on the intake side.

3-4-5 : Sounds good.

But yes, if you turn the engine over right now and it makes any stops or you hear a 'tick' you need to just start pulling the head and prepare to replace valves, pistons, or the head. Just depends on how bad the damage is. Either way prepare to start deburring the pistons, replacing valves, and more or less.

 

[xiteamxi]

wow man were in the same boat i also have a 95 tsi awd and my timing messed up yesterday i already pulled my head and i believe the valves are slightly bent so i guess try a compression test (mine showed >15psi across all 4 ) then pull the head and see what she looks like.

 

[bryanwheat]

The timing marks are definitely off. You have a 99 percent chance of bent valves.

 

[kt239]

Yes it indeed looks discouraging 100% . I'm crossing my fingers for minimal valve bendage but it's looking like there's going to be at least a few. Aaa just got here so thanks for the company everyone I appreciate it.

 

[92AWDHX40]

Pull the head and see the carnage, good luck to you, mine shredded once many valves bent.

 

[ed1380]

Don't sweat it. You'll have it running by next week

 

[XiKeiyaZI]

Don't sweat it. You'll have it running by next week

He'll be running by this evening if he's as determined as too many of us are to keep our crap-boxes running!

 

[kt239]

Oh it be this evening I called off work.. Almost got timing cover off right now

 

[XiKeiyaZI]

Lmao. Sounds like what I'd do.

Let us know what the results are asap!

 

[BogusSVO]

Once the head is off....
http://www.dsmtuners.com/forums/newbie-forum/420313-how-fluid-test-4g63-cylinder-head.html

Also....
http://www.dsmtuners.com/forums/cylinder-head-short-block/420045-how-have-4g63-head-rebuilt.html

Once you pull the bent valves, look for cracked guides

http://www.dsmtuners.com/forums/newbie-forum/341218-how-change-valve-guides-4g63t-head.html

If you are lucky and do not have any cracked guides.... Get some replacement valves...

http://www.dsmtuners.com/forums/articles-engine-fuel/341636-how-lap-valve.html

And do this...
http://www.dsmtuners.com/forums/newbie-forum/341028-4g63t-head-oil-port-mod.html

 

[thomyd]

is there ever an issue with the rod bearing damage after a valve/ piston tap? i had a 92 laser i picked up with a timing belt snap. replaced the head and 2 months later a rod went thru the back of the block. i was on my way to florida for the winter and blew it in tennesee...

 

[92AWDHX40]

i had mine tap my pistons bearings were fine.

 

[XiKeiyaZI]

I suppose if it impacts it hard enough it could potentially cause some bearing damage...It'd make sense thinking of it in that aspect, but beyond that I've never heard of those issues.

 

[T is for TURBO]

I doubt a t-belt failure would cause bearing failure. I've bent rods before killing bearings. Shit, I've seen an engine hydro lock, bending the hell out of all four rods, and the bearings were just fine. Journal bearings are incredibly stout when the force is perpendicular to the bearing surface.

Bearing failure is almost always due to poor oiling. Wheather it is lack of oil, or contaminated oil. After that, I'd guess that second most common bearing failure is due to poor machine work. After that, I'd say wear and tear.

OP good luck with the t-belt. Now is a PERFECT time to do a few updgrades

 

[kt239]

Well what a mess this is.. Eye candy anyone?

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The belt was pretty bad off and to my surprise after the timing cover was removed the sprocket on my oil pump was bad off as well!

 

[XiKeiyaZI]

Woooo. That looks fun. Likely found part of the issue, if not the entire issue regarding the belt failure right there.

Now how do those valves look?

Also looks like there is water on your camera lens... ar-...are you crying? Are those...tears?

 

[ebonyswan]

I would wonder if your oil pump seized - definitely check that out before you put the motor back together...

 

[XiKeiyaZI]

Might as well go the full nine yards. New Water and oil pump. Go go go!

 

[T is for TURBO]

Those are tears, definatly tears.

OP, how many miles are on the car?
Do you know how many miles are on that t-belt? How long has it been on the car? Is it OEM?

I siezed an my 7 bolt while doing 65-70 mph on the freeway and the t-belt never shredded like that... I think the fact that the sprocket looks thrashed (can't really tell from the picture) may have contributed to the t-belt failure. Did you find any debris (other than tbelt carnage) in your t-belt covers?

 

[kt239]

The camera is messed up it got parts cleaner in it a while back.

I have an extra oem oil pump that will be taking its place along with a new front cover I had laying around.

Motor has 1k +/- 100mi and that is a gates racing belt. Nothing other than chunks/slivers of belt. Everything pertaining to this motor is on the same mile frame since it was a full rebuild. Almost forgot to mention that yes that sprocket is indeed trashed. It was new from dealer but I have a ex one of those as well.

Also I am working my way to going down the list of tests for the valves listed earlier.. Just takes me time cause I try to stay organized and clean up as I move forward.