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Yep mechanics gloves Bruce . Some time I don't get what goes into the heads of designers the outlet on the rocker box is 15mm the inlet on the manifold is 20mm go figure?
So can one buy a 20mm fitting as per picture ?
Bernie .

Bernie if the threaded side is NPT thread then you'll need to find a bloody good supplier.
I recently tried to find a 20mm one like you're after to run a 3/4" suction hose for the water supply to my generator...........
Daish Irrigation had none in stock & looked up several manuals & none available. I ended up slipping an inch long piece of clear plastic pipe on first & then the 3/4" hose over that & then clamped.
Clear was like on fish tanks etc.... cheap crap will do.
I ran a bit(drill) through the guts of the original fitting as it had a thick wall. Got several sizes bigger hole.
You might be happy with one of those cheaper black poly irrigation fittings? Just use a short bit of 15mm on one side... 20mm on the other.
http://www.ebay.com.au/itm/Hose-Reducer ... SwA3dYbzrL

I was going to check out the agg fittings in Biggenden later .
Bernie .

Bunnings stock 20mm brass fittings. They don't stock imperial.

Do you have an Enzed or Pirtek in town. They'll have them
Also noticed that Total Tools have brass fittings when I walked though the other day.

http://www.ebay.com.au/itm/BRASS-BARB-1 ... SwhOVXe1MW

http://www.ebay.com.au/itm/Metric-BSP-G ... SwPh5ZHVfs

http://www.ebay.com.au/itm/1-2-Male-Thr ... SwX6VTxkV2

http://www.ebay.com.au/itm/BSP-Male-Thr ... wIXBLr_gNQ

Jon I might be wrong but the fitting I was after & it looks the same as what Bernie is after is actually ....
1/4" NPT male to 3/4" barb.
I already had the 1/4" NPT to 1/2" barb. (1/2" garden hose fitted it & I wanted 3/4" garden hose size)
Yes, I know! I have no idea why they say 1/4" ......... must be the hole size?
Take one of the existing ones with you Bernie.

1/4 to 3/4..... that's harder than finding an oil seal....

Jon if you look at the table here you'll see that 1/4" NPT is really around 1/2" OD !!!
https://en.wikipedia.org/wiki/National_pipe_thread
Just like electrical wire sizes ... just doesn't make much sense!!
http://www.stpats.com/manuals/MEP%20man ... Sizing.pdf

Can't easily see one on line.
Might be a case of silver soldering two things together.

I see you lot have been talking behind my back again .
Jon I live in a small rural community we do have a small hardware shop which in most cases doesn't have what you want , also a small Ag shop .
I didn't go to Biggenden yesterday to see what they may have . I do have time up my sleeve as I'm still to remove the oil cooler cover , then I'll know what gaskets I will need to buy and or new oil cover that will mean a drive to Maryborough to order said parts . I can order them and pay for them and then have them sent direct to my add so not to have to do the 200K round trip to pick them up .
I was of a mind as you said Jon to silver solder if I cant find suitable fittings . Bruce to take the fittings with me would mean taking either the inlet manifold or the rocker box with me , the male fittings are pressed in not screwed...as I feel on some days...
Thanks for the support .
Jon I'm going to need to know how to time the injector pump to TDC on number one piston , as I don't know for sure where it now sits .
Bernie .

Bernie,

For said Isuzu parts, I can pick them up from Dandenong Isuzu and post them to you. (03 9215 2300)
It may be worthwhile getting one of these:


https://www.ebay.com.au/sch/i.html?_fro ... l&_sacat=0


I have one like this:
http://www.ebay.com.au/itm/Isuzu-6BG1-D ... Sw0YlZc~Gk

has all the diagrams and part numbers. (the gasket photo I sent is a sample)