1990 Mits van vibrates after water pump, timing belt replacement?

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wishnet - 04 Oct 2008 00:14 GMT

I have a 1990 Mits van with 100k miles on it. I had it serviced and the
water pump and timing belt were replaced. Ever since that service, the
van has had a strong vibration. It's related to the motor, not the
tires, but it's a vibration that feels almost like I have snow tires on
or something. The vibration is easily perceptible in the gas pedal, and
my backbone gets a good shaking. Steering wheel shakes. Everyone that
knows the van well noticed it right away when they were in the van for
the first time after the service.

What kind of issue might be causing this, that might be associated with
replacing a water pump or timing belt?

I've asked the mechanic and he says it seems ok to him. He wants to
write it up as a change in my perception....but he's wrong. Its
positively very different. I've had this van for a long long time, it's
never been like this.

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cselby@mts.net - 04 Oct 2008 01:41 GMT

>I have a 1990 Mits van with 100k miles on it. I had it serviced and the
>water pump and timing belt were replaced. Ever since that service, the
[quoted text clipped - 7 lines]
>What kind of issue might be causing this, that might be associated with
>replacing a water pump or timing belt?

What engine in the van??? Sounds like a balance shaft that is out of
tune (if it's a 1.8, 2.0. 2.4 4cyl engine)

P

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wishnet - 04 Oct 2008 02:12 GMT

> >I have a 1990 Mits van with 100k miles on it. I had it serviced and the
> >water pump and timing belt were replaced. Ever since that service, the
[quoted text clipped - 12 lines]
>
> P

It's the 2.4 4cyl engine. Would replacing the water pump and timing
belt, related seals, have put the mechanic in a position to get the
balance shaft 'out'?

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aarcuda69062 - 04 Oct 2008 02:19 GMT

> > >I have a 1990 Mits van with 100k miles on it. I had it serviced and the
> > >water pump and timing belt were replaced. Ever since that service, the
[quoted text clipped - 16 lines]
> belt, related seals, have put the mechanic in a position to get the
> balance shaft 'out'?

Absolutely!

They failed to follow the factory procedure for setting the timing on
the balance shaft. (there's more to it than just aligning the sprocket
marks)

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cselby@mts.net - 05 Oct 2008 01:52 GMT

>It's the 2.4 4cyl engine. Would replacing the water pump and timing
>belt, related seals, have put the mechanic in a position to get the
>balance shaft 'out'?

2.4 has 2 balance shafts. One is driven with a separate balance
shaft belt and the other - the one that is out 1/3 0r 2/3 of a
crankshaft turn is the one causing the vibrations. There is a
proceedure to set that balance shaft correctly. There is a hole (with
a threaded plug) in the side of the block just over the starter.
With the crankshaft set at TDC or timing mark, rotate the balance
shaft until you can shove a screwdriver though the hole. The balance
shaft sprocket can spin 3 times and only one time is correct.

Your guy should know this or at least be able to find the procedure.

I just normally spin the balance sprocket until the sprocket doesn't
try to spin out left or right and wants to stay at the correct
position. But I've been doing alot of these on Hyundai.

When checking timing after a belt replacement, you have turn the
engine over 6 complete turns of the crankshaft or 3 turns of the
camshaft or that balance shaft will show up as out 1/3 or 2/3 of a
revolution.

This procedure is the same whether the engine is an early Mitsu 2.6
chain drive(used in Chrysler cars), 2.4 single cam, 1.8 or 2.0 twin
cam belt driven engines. All these engines were used in Chrysler,
Hyundai and Mitsubishi and others we don't see a lot of in north
america.

P

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letterman@invalid.com - 04 Oct 2008 05:20 GMT

>I have a 1990 Mits van with 100k miles on it. I had it serviced and the
>water pump and timing belt were replaced. Ever since that service, the
[quoted text clipped - 12 lines]
>positively very different. I've had this van for a long long time, it's
>never been like this.

Bent blade on the fan maybe????
Be sure they tightened the fan bolts too, as well as the other devices
on the belt.

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