tips to loosen tight nuts to remove injectors

[ABrit]

I am attempting to remove fuel injectors for servicing. The nuts on the pipe connectors are really tight and I am having difficulty undoing the back ones both sides. Any tips here would be appreciated. I guess applying heat is out of the question???

[Jonny042]

The manual probably says "remove fuel injectors"

A crow's foot wrench on an extension an a long ratchet handle or breaker bar can be a big help. I have often wished for a swivel-head flare nut wrench when getting at mine.

[chrismorse]

you really don't want to bugger the bolt head, ( or is t an allen head). I just did this on my wife's benz and they were TIGHT. If you yse an 6 point socket rather than the usual 12 point you stand a better chance of not buggerring the head of the bolt. Make sure it is fully seated and square on the bolt. Or as others have suggested use a crow's foot.
I had to move a bunch of stuff, (dipstick and tube, oil filter, part of the air intake) to get a good shot at the bolt.
use whatever combination of swivel, extension, or wobbly you need to to getback enough to get a good leverage on it.
good luck.
chris

[bahman]

What MY car is this? Can you show a pic of where the line and fitting meet?

[john walker's workshop]

2 wrenches in a V shape and squeeze them together.

[bahman]

Originally Posted by john walker's workshop

2 wrenches in a V shape and squeeze them together.

Did you mean spreading them out? It's a good technique. I've used on injectors on my '72 MFI system.

[ABrit]

This is a 85 3.2. I have tried the two spanner squeeze but it won’t undo. I realise I need to have a spanner on both sides of the connection but boy how do you apply adequate force. I have a hot air gun to heat one nut but am really worried using it near a fuel line. Lordy Lordy these things are a test.


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[gtc]

I just did this last weekend. No special tricks, but having some reasonably long wrenches with narrow flats definitely helped. Maybe soak with penetrating oil for a day if you are having a lot of trouble.
I'm not sure how you could apply much heat back there with the engine still in the car... lots of vacuum lines in the vicinity.

[mo-mon]

Do NOT apply heat. If the injectors are still on & the car runs, go for a spin , warm up the engine to operating temp, & try the john walker technique.

[ABrit]

Thanks I’ll get back and have another go. I’ll not use heat.


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[mo-mon]

Oh, if you do get to loosen the nuts, let the engine cool down before loosening all the way.

[ganun]

Remove heater blower, fuel line from filter, 3 connector assembly, to gain access.
Like Walker said, a 15mm and 17mm wrenches in a V and squeeze together.
Gotta have room.

[ABrit]

Thanks guys I went back and gave another try after soaking and i got it. On the right side which has good access the nut was done up super tight on the left it was not too bad. I guess whoever did these up over tightened the right side because he could. As you do.