89 Navara with D27 black smoke - how much to replace injectors and time the pump

Thanks for the responses. I've booked into a place which is quoting $500+GST including labour to replace the injectors, re-time the pump, and adjust the tappets at the same time. I'll let you guys know how it goes. Hopefully ok, because the ute will be doing an 1800km drive to Melbourne only 2 days later!! Fortunately its just had a full service so everything else he wanted to replace (filters etc) has just been done.

Paul

ps. To the fuel additive guy "Bi-Tron" - no additive can fix worn out parts (and before you tell me your product is not an additive - you *add* it to the fuel and/or engine oil so it is an additive!). I have no idea how you make your product, but many of its ilk are a kerosene base with long chain polymer oils which make things seem better for a while. If you still make the claims you make on your website then I'd love to see hard engineering data from an independant third party (eg. a materials testing lab combined with road tests supervised by a 3rd party - eg RAC).