Fuel injectors

Discussion in 'Mk2' started by Joehough, May 14, 2019.

  1. Joehough

    Joehough Paid Member Paid Member

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    Anybody know if this is correct injector for 89 KR engine. Car was built for export to Cyprus. Bosch part number is 0 437 502 010 with 014 in a circle on the end. No o rings on the tips. Spray pattern not good either. Thanks IMG_20190514_1712186.jpg IMG_20190514_1711395.jpg
     
  2. rubjonny

    rubjonny Administrator Admin

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    the KR engine should have top hat type injectors for the air shrouding system, the vacuum connection for it is either on the front of the inlet between cylinders 3 & 4 for the 50mm inlet, for the smaller ones its usually on the 5th injector housing. either way the hose is linked into the breather hose. If you still have that hooked up and non-shrouded injectors you end up with an air leak past the injectors. Also happens with the right injectors if the seals or plastic bits under the brass inserts are cracked.

    anyway, VW part number for the KR injector is 026133551 which are the coarse thread type M12x1.5mm. Or you could use MK1 type or the mercedes brass coarse thread non-shrouded injectors if you block off the vacuum port for the shrouding system :)
     
  3. Joehough

    Joehough Paid Member Paid Member

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  4. Joehough

    Joehough Paid Member Paid Member

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    IMG_20190515_1936117.jpg IMG_20190515_1935565.jpg I guess you mean this pipe? I have just blank it off and car seems a bit livelier just got up to 110 and was still accelerating, and seems to be better throttle response. New injectors ordered thanks IMG_20190515_1936117.jpg
     
  5. rubjonny

    rubjonny Administrator Admin

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    Injectors look fine, they have the top hats so air shrouding system can be left intact. If you're doing the injectors you might want to look at the plastic lower inserts and seals seals as well unless they've been done recently?
    035 133 554 - plastic insert
    https://www.vwheritage.com/035133554-lower-fuel-injector-insert-for-k-jet-vw-spare
    035 133 557 - plastic insert seal
    https://www.vwheritage.com/035133557-sealo-ring-for-injector-insert-vw-spare

    that pipe is for the WUR so needs to be left alone ;)

    on the 50mm inlet the shrouding pipe connects to the front of the inlet manifold between cylinders 1 & 2, it comes from the front block breather pipe
     
  6. Joehough

    Joehough Paid Member Paid Member

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    Thanks Jonny I couldn't see a pipe on manifold, so thought it was the one in top picture pointing towards top of picture, that is one I have blanked off with a bolt. Will have another look this arvo.
     
  7. rubjonny

    rubjonny Administrator Admin

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    50mm outlet for air shrouding:
    breather1.jpg

    47mm outlet (inlet is still 50mm, but has wrong 5th injector housing fitted)
    breather2.jpg
     
  8. Joehough

    Joehough Paid Member Paid Member

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    Thanks Jonny, I found it between 1 and 2 like you said. New injectors should arrive tomoz. How do the injector plastic inserts deteriorate? I thought it would just be the o rings, although I guess I can do both at a later date.
     
  9. rubjonny

    rubjonny Administrator Admin

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    Only problem with the lower inserts is they are brittle, and if you pull the injectors out at a slight angle and/or not careful when removing and replacing inlet you can snap the ends off. trouble is you cant check them unless you remove the inlet. job you can save till you have inlet off for some other reason :)
     
  10. Joehough

    Joehough Paid Member Paid Member

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    Okay thanks, I have ordered them plus seals, so do I need to take I let off to swap them?
     
  11. rubjonny

    rubjonny Administrator Admin

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    Its a bit tricky to pull them out of the inlet in situ, but if you can retrieve them then no need to pull the inlet :)

    they're potentially brittle so might loose bits in the head if not careful
     
  12. Joehough

    Joehough Paid Member Paid Member

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    Okay thanks, I am well confused now, the old inserts are the screw in type with 12 mm hexagon, and the new inserts look like push fit, but my new injectors don't fit them, the insert is bigger diameter than the fat o ring. Wonder if I have wrong inlet manifold? IMG_20190520_1906526.jpg IMG_20190520_1908409.jpg
     
  13. Joehough

    Joehough Paid Member Paid Member

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    Doh just done a bit of research and realise the inserts I was referring to are the brass screw in top bits, so I do have correct lower inserts after all! Shining a torch down the holes I can see that there are no lower inserts fitted, so I am currently running my new top hat injectors without lower inserts so they are flapping around a bit. Just got to work out how to get the brass inserts out they seem very tight.
     

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