88 Samurai Engine Vibration at certain RPMs - Suzuki Forums: Suzuki Forum Site
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Old 06-24-2010, 06:51 AM   #1 (permalink)
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Default 88 Samurai Engine Vibration at certain RPMs

I have an 88 Samurai and just replaced the timing belt and tentioner. It runs great but when the engine passes between 3,000 - 3,500 RPMs there is a vibration coming from the engine. It is not violent but you can feel it through the seat and hear it. It will do this while driving or sitting still so it is not in the drive train. Did I tighten the belt too tight or something? I changed the fan clutch out with another one and that did not do anything. Could it be a
unbalance or damaged fan blade?

To be honest I do not remember before the new timing belt if this vibration was there or not.

Thoughts are appreciated. Thanks
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Old 06-24-2010, 11:43 AM   #2 (permalink)
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Suzuki uses an external harmonic balancer. Did you get the bolts tight when you put it back on the front of the motor?
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Old 06-24-2010, 11:51 AM   #3 (permalink)
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When I did the timing belt I did not remove the crank gear....just the pully. Everything went back smooth.....Where are the balancers? Could I have overtightened the TB and would this be a symptom of one? Thanks
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Old 06-24-2010, 12:08 PM   #4 (permalink)
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I don't recall a harmonic balancer on the front of the 1.3, just a pulley.
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Old 06-24-2010, 12:33 PM   #5 (permalink)
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I am thinking of pulling the drive belt off and running it down the street and back quickly to see if the vibration is coming from the fan. I do not think it will overheat in a short distance.
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Old 06-24-2010, 02:32 PM   #6 (permalink)
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Keep it under 2~3 minutes and you should be fine.
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Old 06-24-2010, 02:47 PM   #7 (permalink)
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It's not like a harmonic balancer like you would find on a big V8... The cast pulley actually acts as a balancer. You can see on some where small dots have been drilled out on the back of the casting to balance the pulley.



Sorry, I don't have a better picture of the cast pulley here at the office.
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Old 06-24-2010, 03:30 PM   #8 (permalink)
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Thanks...now just ship that engine to me. I remember the pully being fairly stout so that makes sense. I just can't figure out why it would start after the TB replacement. There really is only one way to install the pully...
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Old 06-24-2010, 03:39 PM   #9 (permalink)
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Quote:
Originally Posted by gsrogers View Post
Thanks...now just ship that engine to me. I remember the pully being fairly stout so that makes sense. I just can't figure out why it would start after the TB replacement. There really is only one way to install the pully...
That's the one that went into this:

And then took it to just over 100mph...

I realize that it only fits one way, but I remember that the bolts are not the biggest and if you don't torque them to spec they could back out a little and cause an imbalance. It's the only thing I could think of for that problem.
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Old 06-24-2010, 05:54 PM   #10 (permalink)
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Quote:
Originally Posted by Billjohn View Post
It's not like a harmonic balancer like you would find on a big V8... The cast pulley actually acts as a balancer. You can see on some where small dots have been drilled out on the back of the casting to balance the pulley.
Yes - there is a cast pulley, but as far as I know it's not a balancer of any sort - and I know several people who have replaced it with lighter & smaller aluminum ones and had no problems whatsoever with vibration.
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