4g61t.org

So, I have replaced the cams with new seals (272s), cam gears (HKS), idler pully is good, tensioner pully new, brand new Gates timing belt, tension set to .157. Ran the motor with just the timing belt on and I can't see and pulleys wobbling or out of round but the belt is walking very noticably. Basically the same amount of walking as it was before I changed those things. Any ideas?

I'm going to tear everything back apart in the next couple days and see if there is anything I missed.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

I will also add that the belt never over hangs the cam gears at any point.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

were the cams replaced with all this stuff..or were they in there when it happened before? the face where the gear goes might not be perfect and could be causing it.. (if those are the only thing you didnt replace)...

Steve

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Steve 89 colt 2.3 stroker stock top end. evo3@20 psi 13.489@99.30mph 3/10 2012
On drag radials.auto trans.launching @ 5 psi and no traction thru 2nd.

Yes, they are new delta 272s, I think I bent valves upon installing them so I'm about to just say f it to all this shit lol

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

Idler on the correct way? Not even sure if you can put it on backwards or not.

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93 Mitsubishi Expo LRV 1.8/manual
95 Eagle Summit DL Coupe 1.5/manual
01 Mitsubishi Mirage ES Sedan 1.8/manual

Something about the backing washer in the crank pulley comes to mind? Flipped wrong way? Not much else can cause a belt to walk off unless it is being angled at some point, or being pushed/contacted.

Yeah it's good, impossible to install back-wards.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

I was actually just looking at that last night Flying Eagle, good thought, basically it wouldn't run if the plate was installed backwards BUT the plate does bow out on the circumference and is pretty dang sharp and comes very close to the belt but I'm gonna need a little mirror and some more time invested. I've thought about tapping it so it's flat around the edge but I got to see if it is indeed what's rubbing first. I also checked for crankwalk and the play is about .002-.003 but I was pretty damn scared for minute there lol

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

So I'm going to wake this back up because I am still having the timing belt walk issue. After maybe 100 miles it is starting to show material loss. Like I said the cams are new, the idler and tensioner pullys have been swapped with known good ones and the crank sprocket and oil pump sprockets don't appear to be bent. Tension is set to spec. I haven't been able to locate any belt shavings or debris yet. As far as I know the motor has been doing this since I purchased it. Any ideas would be very helpful.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

Absolutely no shavings anywhere along the path of the belt? On the water pump, on the timing cover yada yada yada. If you are loosing material it is going somewhere.

I agree and will look again white glove test maybe.. no timing covers only because I wanted to monitor the situation.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

Are you sure it's rubbing on the sides? I know that if you put one of the long oil pan bolts in the wrong spot it will make contact with the belt. Did you have the pan off recently? It's probably not your issue but ya never know.

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1993 single turbo supra
2000 Lexus sc300
2016 ram 1500

It's actually walking back and forth, you can see it at idle. So I decided to mark the sides of the belt with a sharpe marker to see where exactly it would be rubbing then I was gonna use whiteout and look for the flakes but the marker never got rubbed off of the belt, and now I just think I'm going crazy. I will monitor the issue and post pics if the belt starts looking smaller. If someone can give me the exact width of a good condition belt that would help so I can compare and check progrees with a good baseline.

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89 Mirage Billet 20g 63t 12.4@120 417whp 400wtq @ English Racing.
89 Colt GT E316g
06 Silverado SS
07 ZX6R

Balance shaft removed? I know that damn BS belt can be a mysterious bastard at times! It seems that everything else has been covered so I'm at a loss for ideas as well.

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2012 Explorer Limited
1989 Colt GT clone 4G63t auto
1992 Talon TSi
1990 Talon TSi
1995 Crown Vic
1993 Ford F-250 BBF
1987 Chevy Sprint Turbo

Cam gear bent?

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1993 single turbo supra
2000 Lexus sc300
2016 ram 1500