coolant leak to timing belt job?

Bernie Benz b.benz at
Wed Aug 2 09:50:26 EDT 2006

The 90 degree twist test is good enough for single cam S5s but, IMO, not
tight enough for the twin cams. Give it a little more, but DF what AB!


> From: Kneale Brownson <kneale at>
> Date: Wed, 02 Aug 2006 07:45:33 -0400
> To: "Ed Kellock" <ekellock at>, "'q - 200q20v'" <200q20v at>
> Subject: Re: coolant leak to timing belt job?
> Swinging the water pump is how you adjust the tension on a 3B timing belt,
> Ed.  Proper tension "test" according to Bentley is only being able to twist
> the belt "90 degrees with the thumb and forefinger midway between the
> camshaft and the pump sprocket".   Doesn't specify any measure for finger
> and thumb strength, of course.  More than likely, a leak from the pump
> means it's time to replace it and you might as well replace the belt, seals
> and idler while you're at it.
> At 11:23 PM 8/1/2006 -0600, Ed Kellock wrote:
>> My pursuit of a coolant leak in the Avant has uncovered a seriously loose
>> timing belt.  I had thought the leak was suspiciously coming from an area
>> that could certainly have been from the w/p.  None of the many small hoses,
>> buried by the now removed p/s pump seem to have been leaking.  Is it true
>> that the timing belt tension is provided by adjusting the water pump?  I
>> know that's how it is on the AAN but haven't played the t-belt game on a 3B
>> or any 10v motor before.  My theory is that the water pump adjustment came
>> loose and the water leak is a symptom of that.  Boy am I glad I parked it
>> and got the V8 t-belt done and out of the garage before digging into this.
>> The belt is so loose that I can wiggle it back and forth on the water pump
>> pulley.  I could pop it off with one finger if I wanted to.  I can bend the
>> belt 90 degrees with one finger.  The opposite length of it between the cam
>> pulley and crank pulley is snug, but also easily turned 90 degrees.
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