Remove the Glow Plugs? Are you kidding? Do you have any idea how much work that would be? He could simply hold the vacuum shutoff down with an elastic. To remove the GP's the intake manifold and 25 other things have to come off, new manifold gasket, break a bunch of plastic fuel line holders and so on. It will never start turning by hand, ever

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1987 300 TDT
1990 300 SEL