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Re: 86 jetta GL turbo diesel, timing belt/oil pump?
Can you tell the pressure is actually low, e.g. the lifters start making noise (if you have hydraulic liftres - '86 could have either). If the belt is loose it could cause the problem, especially if you don't have the grooved intermediate pulley. You may want to check the pressure with a gauge as the dynamic oil system on those cars is prone to malfunction.
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