Posted by Dieseltech on January 03, 2023 at 09:33:00 from (64.184.64.57):
In Reply to: Re: More power posted by jon f mn on January 03, 2023 at 09:11:38:
That engine has a PFR style injection pump which uses a separate camshaft inside engine to operate the pump tappets/plungers. There are shims under the pump to change the timing, but the stock shims USUALLY work best. Removing shims will ADVANCE the timing, and adding will RETARD the timing. Shims will NOT change fuel rate at all, thats done on engine governor that controls the pump fuel RACK position. A good engine/turbo match will have the EXHAUST pressure about 1-2 PSI BELOW what the intake pressure is at full rated load. If anything I'd try ADDING a thin shim to RETARD the timing a bit which will make EXHAUST temp slightly hotter to spin the turbo faster to increase the intake pressure. When timing is advanced it can COOL the exhaust which will slow the turbo, making less boost. A good match should have a very light exhaust haze to no smoke at all. The injectors may need cleaned, or tips replaced too if they don't seat correctly. Dripping injectors can cause excessive smoke too.
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