Injector O-rings And Insulators

[JimX]

I am about to put some new injectors in my GTR and want to replace all the O-rings and insulators / seals on the injectors. I've done plenty of forum searching and have found some info, but now I also need clarification on part numbers. The 2 different sets of part numbers seem quite a bit different so I'm not sure if they are the same thing or not.

First set of part numbers -

Injector Insulators: 16635-78A00, 16618-78A00 (assume front/rear, but don't know which is which not that it matters)

Injector O-ring: 16636-V5000

I rang up Parramatta Nissan and Hornsby Nissan for the price of all the above times 6 (one per injector) and was quoted around $220 and $180 respectively in total.

Second set of part numbers -

Rear O-ring - 16412F - $9.50

Rear Insulator - 16603F - $13.35

Front seal - 16603G - $5.35

Total $169.20. I forget where from but the thread was a bit old anyway so prices have probably gone up since then.

Both of threads said the part numbers were for a GTR so I don't know if they are the same thing with different part numbers or if someone is wrong or if there is a difference between 32-33-34 GTR's. I doubt the latter would be the case though.

Even the cheapest option above is a holy hell of an amount for 18 tiny pieces of rubber. Does anyone know the exact measurements of the 3 parts so that I could enquire at a fuel injection place for some after market replacements? This is just due for convenience so that I don't have to pull an injector out before I do my running around to find the replacements. Also are the insulators just standard O-rings as well? They look like O-rings in the photos I've seen but they could be a different shape (squared off maybe) or a different type of rubber.

Lastly does anyone know of a fuel injector place in Sydney that would be able to sell these things at a reasonable price? I

[Duncan]

Hey Jim, we looked all over Aus aftermarket and couldn't find anything to suit. Even the rear o-ring took us ages to find something that matches OK, even then it is a little narrow.

front seal is similar to rx7 series 4 but not quite right either.

rear seal is more like a spacer you could run anything that is the right width and a snug fit. But since we had to buy the other 2 bits we went nissan for these too.

[JimX]

Crud!!!!

Any idea on which is the correct part number then? Or are they interchangeable?

[sewid]

Part numbers and costs as follows:

Injector O-Rings	SEAL-O RING		  NI-16618-78A00		$7.40 ea	 x 6 = $44.40
Injector seals	  INSULATOR-INJECTOR   NI-16635-78A00		$10.39 ea	x 6 = $62.34
Injector seals	  INSULATOR			NI-16636-V5000		$4.18 ea	 x 6 = $25.08

All prices are trade. Add a little bit for retail prices.

[JimX]

After Duncan's post I bit the bullet and bought the set (at full retail from Hornsby Nissan for around $167), and also thanks to Sewid for putting up the part numbers he has, basically outvoting my second list of part numbers so I could confidently ask for the first list.

I put the new injectors in last night without a hitch and they are working great!