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  #1  
Old 03-02-2012, 10:12 PM
rrcade rrcade is offline
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Default Broken Timing belt-Which valves are bent?

2001 Hyundai Accent GL 1.6L DOHC
Had a broken timing belt replaced, the shop assured me the valves were fine but when they got it all back together it ran like crap and one cylinder was Way low on compression. So I figured valves must be bent and didn't want to deal with a repair shop again and took the head off myself. The Shop gave me these readings for compression: No.1 185, No.2 101-90, No.3 185, and No.4 184
Now when you look at my pictures None of the pistons look like they even hit a valve and none of the valves look obviously bent however No. 4 exhaust valves stand out-they look white where others are sooty, what does that mean?

They said No.2 had the low compression but from what I saw I would have thought No. 4 had the problem.

When I rotate the cams it seems like some valves never close all the way I'll take a closer look at this and note what I find. Would it be a good start to remove the cams and see which ports/valves will hold water to see if they leak/are bent?

In the last picture it looks like there are valves open in each cylinder except No.4 when the cams are set at No.1TDC
Any input from somone who has been through this is Very welcomed.
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Last edited by rrcade; 03-02-2012 at 10:22 PM.
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  #2  
Old 03-03-2012, 12:48 AM
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What I would do is move to a clean area. But first try to clean the head as clean as you can get it. Then remove all the cam caps (very important you keep them in order to proper location to head) Once both cams are out you will be able to remove the HLA (Lifters) Also note location of HLA. Once your at this point all the valves will be shut. You should be able to put water behind the valves to find your leaky valve. If you have a local machine shop they can properly clean the head. Pressure check the valves. An check flatness of the head. Most machine shops charge between $40-$60 to do this.
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  #3  
Old 03-03-2012, 01:31 AM
rrcade rrcade is offline
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I checked the head and block with a steel straight edge and I don't have any warpage at all It's not apparent that the no.2 Intake are bent for sure but I'm still gonna water test the others. The head is actually really clean with NO sludge so do you think it would be good enough for me to clean it myself with some brake cleaner and compressed air? While I have it apart do you think I should relap ALL my valves even if they aren't leaking or just leave well enough alone? I'm hoping I can just lap in the two new intakes as so far the seats don't look bad, is that possible? A new valve should come already cut to correct angles correct?
Lastly, as far as reassembly what do you prefer plain oil or assembly lube?
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Old 03-03-2012, 01:33 AM
rrcade rrcade is offline
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I'm thinking those two White exhaust valves could be a bad injector on the No.4 cylinder? Anyone know what would cause that on just one cylinder?The spark plug looks white too.
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Old 03-03-2012, 05:46 AM
rrcade rrcade is offline
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This looks awesome, If I can't get it locally I'm gonna make something like it!

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Old 03-05-2012, 12:40 AM
iowawarrior iowawarrior is offline
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that's slick.
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Old 03-07-2012, 07:39 AM
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I just got that tool in the mail from snap on, it takes about 2 seconds to remove or install a valve....nice!
I replaced the two bent intake valves and lapped all 16, tested and have no leaks, so now it's onto installing the cams.
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  #8  
Old 03-07-2012, 06:00 PM
iowawarrior iowawarrior is offline
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excellent. how much was the tool?
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Old 03-07-2012, 06:45 PM
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37.00 I think.
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Old 03-08-2012, 12:00 AM
iowawarrior iowawarrior is offline
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that's seems cheap enough. i hope i never need one, but if i do, that's what i'm gonna get.
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