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Message: <blockquote data-quote="Gearclash" data-source="post: 142677" data-attributes="member: 11467">You talking about the timing mark cover on the injector pump?  I'm not aware of any other timing marks under a cover.  There are timing marks on the flywheel but they are readily visible without removing covers.Yes you will need to move the big sheet behind the seat to remove the valve cover of the 188D.  Best to remove the sheet altogether to remove injectors.  The valve cover of the 148G engine is removable without that drama.I would not get at all excited about the lower compression test pressures until you have the engine running again and can verify that there is a problem worth correcting.  Those 188D engines are naturally smoky, harsh running engines with poor cold starting characteristics.  They also use very little fuel and have good low end torque compared to the 148G.</blockquote>