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Just a quick follow up to the previous post, finally summoned up the courage to tackle this job myself, walked out to the shed at 8:30 am removed the battery in the truck, undid the two bolts that hold the cover on for the speed timer assembly, replaced the very flat O-ring with a nice plump 1" Diameter O-ring, replaced the cover, put the battery back in and walked back inside after running the truck for 10 mins to check for leaks at 9:00 am.
This is a very simple job to do with a limited amount of mechanical knowledge, not scary like I thought it might be(I hate taking covers off things that are vital to the truck running).
I just thought I would put this up for reference for anyone who may encounter the same problem.
Mark
Proud former owner of a 1997 White GQ TD42 Patrol Cab Chassis with an after market turbo, now with over half a million k's and still going strong, that's had a heart transplant and now not owned by me