What happens if the timing belt brakes?


Information and questions on GL1100 Goldwings (1980-1983)
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raggun
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What happens if the timing belt brakes?

Postby raggun » Wed Jul 27, 2011 11:29 am



Hello everybody

I will be getting my 1981 standard tomorrow. It has 33.000 miles on the clock.

The replacement history on the timing belts is unclear so replacement is a must.

It is however clear that a few days will pass utill i can get it to the garage for replacement and I am clearly interested in riding the bike.

So my question is:

What will happen to the motor if the timing belt snaps. Is the motor ruined.....or

From what I have heard is that the newer motors are perfectly ok if the belt snaps, does the same apply to this older one.



nickgroves0308
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Re: What happens if the timing belt brakes?

Postby nickgroves0308 » Wed Jul 27, 2011 12:01 pm

Having read several posts on several goldwing sites regarding timing belt replacement, I would absolutely advise you to change the belts immediately. I just changed my belts and tenstioners (38k miles on bike) last week. If the belts fail you risk catostophic engine failure. Valves and pistons colide = major problems.

That being said, I did roll the dice and I put a couple thousand miles on my 82' wing before ever changing the belts. There is just no way of knowing if the bike with run fine with no belt failure or if one will snap on your first ride. Better to be safe and change them out.

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Re: What happens if the timing belt brakes?

Postby cbx4evr » Wed Jul 27, 2011 12:58 pm

Interference engine = big $$$$$ when a timing belt brakes.

If the belts are 30 years old I would certainly put changing them at the top of the to do list.
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

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trike lady
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Re: What happens if the timing belt brakes?

Postby trike lady » Wed Jul 27, 2011 2:29 pm

I'll add the same, change the timing belts because if they should break the end result is engine damage. :o
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raggun
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Re: What happens if the timing belt brakes?

Postby raggun » Wed Jul 27, 2011 3:03 pm

So there is a difference between older and newer models in the effect of a timing belt snapping.

I am at least told by my local Honda dealer that on the newer models nothing happens to the motor, the bike just stops running until the belts are replaced.

Goldwing 80
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Re: What happens if the timing belt brakes?

Postby Goldwing 80 » Wed Jul 27, 2011 5:34 pm

The early engines are an interference engine.If they snap,Mr. valve will meet Mr.piston,and they wont get along!

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RoadRogue
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Re: What happens if the timing belt brakes?

Postby RoadRogue » Wed Jul 27, 2011 11:09 pm

As the others have said,yours is an interference engine. If a timing belt breaks while the engine is running the pistons will hit the valves(interferance) . If you have this happen and you get lucky you will have only bent the valves,worse is the valves will punch a hole in the top of your piston or pistons.And even worse yet is bent valves AND holed /broken piston AND bent rods. You can replace valves relativily cheaply but anything more than that it would be cheaper to replace the engine. Just be patient and wait till you have new belts installed, I know its tough but if the unthinkable happens you will be kicking yourself for years to come.

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raggun
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Re: What happens if the timing belt brakes?

Postby raggun » Thu Jul 28, 2011 6:19 am

Does anybody know when the Goldwing engine changes from an interference engine to a non interference?

Knowing whitch kind of engine you have is pretty valuable info.

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WingAdmin
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Re: What happens if the timing belt brakes?

Postby WingAdmin » Thu Jul 28, 2011 3:21 pm

ALL Goldwing engines, from GL1000 up to GL1800 are interference engines.

A belt break can cause as little as a couple of bent valves to as much as perforated pistons, damaged connecting rods, and more.

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Re: What happens if the timing belt brakes?

Postby thrasherg » Thu Jul 28, 2011 3:37 pm

raggun wrote:So there is a difference between older and newer models in the effect of a timing belt snapping.

I am at least told by my local Honda dealer that on the newer models nothing happens to the motor, the bike just stops running until the belts are replaced.


Not to be rude, but I think your dealer is an idiot!! All modern engines are interference engines and will have very bad results if a timing belt breaks.. In the older days we had low compression engines (Because we didn't have the knowledge/skills to build high compression engines) and they could get away without damage, but any modern engine will be a different story. Any petrol engine designed after about 1960 will probably be an interference engine. Some people do get away with broken belts not damaging the engine as it depends where the cam stops when the belt breaks, but that is just good luck!!

Gary

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Re: What happens if the timing belt brakes?

Postby WingAdmin » Thu Jul 28, 2011 3:40 pm

thrasherg wrote:Not to be rude, but I think your dealer is an idiot!! All modern engines are interference engines and will have very bad results if a timing belt breaks.. In the older days we had low compression engines (Because we didn't have the knowledge/skills to build high compression engines) and they could get away without damage, but any modern engine will be a different story. Any petrol engine designed after about 1960 will probably be an interference engine. Some people do get away with broken belts not damaging the engine as it depends where the cam stops when the belt breaks, but that is just good luck!!


I don't know about 1960....my crappy old 4 cylinder 1979 Mustang had a non-interference engine (I know, because I broke the timing chain on it), but you're right about two things: virtually all modern engines are interference engines, and the guy's dealer is an idiot. :)

milkman00
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Re: What happens if the timing belt brakes?

Postby milkman00 » Sat Jun 02, 2012 4:04 pm

I purchased a 1977 gl1000 a few months back, been an on going project for me to learn on.... Unfortunately broke a timing belt. I was at a stop light, hoping damage was minimal, did a compression test, valves 1 and 3 seem are really low. Being new to this scene, was wondering if I should skip replacing valves myself and take to a shop.Also when I adjusted the valves they were REALLY tight I adjusted back out to .oo4, unfortunately after belt broke, could that have been the cause?

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Re: What happens if the timing belt brakes?

Postby RBGERSON » Sun Jun 03, 2012 2:55 pm

It's not hard to change out valves but takes some tools..spring compressor the oen most don't have but there are ways around that too., should lap the valve seats while you're at it, new seals..all of it done on a bench..not on the bike that's nice.. or on the kitchen table in the A/C.




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oldgold82
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Re: What happens if the timing belt brakes?

Postby oldgold82 » Sun Jun 03, 2012 3:02 pm

There are still many non interference motors. They are usually the small displacement econo car motors, but not always. There is also a second type of interference these days on dohc 4 valve per cylinder motors your pistons and valves do not interfere but open valve paths might. I think this is more common with timing belts skipping a tooth rather than completely breaking. That said, a lot of cars today have variable timing chains in cases were the engine is interference. Also, pretty much every diesel engine I know is interference, the biggest gripe I hear from Volkswagen diesel owners is that they HAVE to change the timing belt every 60k or else. That's an expensive regular service.




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