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Location:
Sydney
Registered:
August 2004
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Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 00:36
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Hey guys,
I snapped the timing belt in my rolla last night, just a quick question, i've been told its very likey that i have bent / snapped the valves.
Just wondering if anyone has snapped the timing belt in a 4AGE before and how common it is to bend or snap valves.
Also what sort of process you went through to fix the problem.
I was told i should get the valves reseated and head machined while its off.
Can someone just give me a insight of the process of replacing belt and fixing valves / head if needed.
CHeers
Bourny
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Location:
Adelaide
Registered:
May 2003
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 00:38
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Most 4AGEs are non-interference unless it has been modified fairly heavily.
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Location:
Terrigal
Registered:
May 2002
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 00:40
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Yeah like Takai said.. it is unlikely you have bent any valves.
Just get a new belt, line up all the timing marks and away you go.
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Location:
Sydney
Registered:
August 2004
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 01:25
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Thanks for your replys..
So most 4AGEs are non interference? thats means its unlikey i did any damage to the engine with the belt snapped?
Cool.. i hope you guys are right..
Anything else i should get done when putting the belt on?
Cheers
bourny
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 03:14
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a new timing belt idler/tensioner.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 03:57
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You probably would have heard some great sounds if you actually did some damage 
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Location:
Melbourne
Registered:
November 2003
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 04:24
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Yeah, if it wasn't/isn't a non-interference engine the valve would have slammed into the piston. This bends the valve, and also smashes a nice hole in the top of your piston. Also make a very bad sound (not that I would know, I've only seen the aftermath, but I've been told).
So if you have bent your valves (and you probably haven't due to yeah, non-interference engine) it would probably be full engine rebuild / replacement time.
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Timing Belt - 4AGE Smallport
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Wed, 27 October 2004 05:48
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4ages are known to roll their way to workshop after belt snaps. all they do is cchange belt and off u go!! Common for 4ages
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Location:
Sydney
Registered:
August 2004
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 03:48
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Ok, i replaced the timing belt, and still won't start. i have no idea.
Did a compression test and it was very low on all cylinders, 80 80 90 100....
I'm thinking i did bent / snap the valves, otherwise what would cause these low compressions?
I have checked everything, please help.. ASAP!!!
Cheers
Bourny
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 08:55
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did you line the cams up correctly with the engine at TDC?
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 09:01
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i have a problem too. i changed my cams, put the cam gears and belt in to exact location (marked gears and belt b4 removing).
After cranking engine one cycle by hand, the marks dont meet. Probably due to belt tension change. How do i overcome this problem??
bourny, u sure u didnt put cam gears up side down?? Maybe u have same problem as me.
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Location:
Adelaide
Registered:
May 2003
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 10:49
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Just keep retensioning the belt, it may be out by like one tooth. Also its two cycles of the crank to line it up.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 13:22
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timing - cam/s and or ignition.
the compression is not too low to be able to run, and is too high & consistant for bent valves.
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 14:38
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| takai wrote on Sun, 31 October 2004 21:49 |
Just keep retensioning the belt, it may be out by like one tooth. Also its two cycles of the crank to line it up.
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will try 2 cycles. my mistake.
Which part of melbourne are u?? 
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Location:
Sydney
Registered:
August 2004
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Re: Timing Belt - 4AGE Smallport
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Sun, 31 October 2004 23:24
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Thanks guys, ill check the timing again also the cams at TDC...
what would cause the low compression? bottom end wearing out?
Ill check these things today and ill let you guys know what happens...
i ready to get rid of this car, i just want something more reliable but i don't have the money to buy one yet...
Cheers guys.
Bourny
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Location:
Sydney
Registered:
November 2004
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Re: Timing Belt - 4AGE Smallport
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Mon, 01 November 2004 00:51
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If you think you have bent valves, check your valve clearances, they will be way out of spec if they are.
4a's are non-interference though, so you shouldn't have a problem. Just line up all you cams and make sure after 2 crankshaft revs it's all still lined up.
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Location:
Adelaide
Registered:
May 2003
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Re: Timing Belt - 4AGE Smallport
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Mon, 01 November 2004 02:21
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East, near Nunawading.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Timing Belt - 4AGE Smallport
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Mon, 01 November 2004 03:19
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also, make sure you have your cam timing set in reference to TDC COMPRESSION stroke....
On the stock cams, there is actually a little notch up the front of the shaft which denotes TDC compression, have these notches on both cams pointing straight up, and then put on the cam gears so that the notches on the cam gears line up with the lines on the timing cover back plate.
Now line up the crankshaft to TDC, there are notches on both the timing gear drive and the crank pullet.
Install belt, and make sure you have enough tension that after a few revolutions (i do about 6) everything is still lined up at TDC compression.
Easy peasy. I dont understand why people get confused doing this....
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Location:
Sydney
Registered:
August 2004
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Re: Timing Belt - 4AGE Smallport
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Mon, 01 November 2004 05:45
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THE WITZL - Thanks mate, we all can't be as smart as you.. i'm still learning, its a long battle, and guys like you are always a good source of infomation.
So thanks for the help and ill be trying to start the bugger tomorrow, so ill let you guys know how it goes..
Cheers for now..
Bourny
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Timing Belt - 4AGE Smallport
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Mon, 01 November 2004 06:12
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| THE WITZL wrote on Mon, 01 November 2004 14:19 |
also, make sure you have your cam timing set in reference to TDC COMPRESSION stroke....
On the stock cams, there is actually a little notch up the front of the shaft which denotes TDC compression, have these notches on both cams pointing straight up, and then put on the cam gears so that the notches on the cam gears line up with the lines on the timing cover back plate.
Now line up the crankshaft to TDC, there are notches on both the timing gear drive and the crank pullet.
Install belt, and make sure you have enough tension that after a few revolutions (i do about 6) everything is still lined up at TDC compression.
Easy peasy. I dont understand why people get confused doing this....
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hey!! first timer here!! considered adventurous to go ahead by my self alright!!!
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Timing Belt - 4AGE Smallport
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Mon, 01 November 2004 06:55
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hey, im only a 3rd timer!
you know what you do - go HERE: http://www.toymods.org.au
# Tech Docs
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