Leaky injectors ?

[jmos4]

Hi

I've got a 89 d250 with a little over 200,000 on it is it common for the injectors to leak?

Is it just a matter of replacing o-rings to fix?

Regards,

[theoldmanW350]

I'm a newbie but what I understand is a leaking injector is an internal issue. Getting them pop tested will determine if they need to be serviced or traded in for a new set. Some guys here built their own tester out of a bottle jack and a pressure gauge and some brass fittings. Pop tests are not cheap and you may get advice to simply buy a new set. Can't go wrong really. I believe our 9mm tip injectors are favorable to guys pushing big HP. You could probably sell them.

[RCCUMMINS89]

Where are they leaking from?

[jmos4]

Its a external leak head is wet with fuel, runs fine no smoke so I don't believe there is are internal leaks

[RCCUMMINS89]

Tighten down your injector locknuts and see if it goes away. Most likely, they have loosened up or the coppers have shrunk over the years.

[theoldmanW350]

Ha. A perfect example for me to Keep it Simple Stupid!

[jmos4]

I'll have to try it this weekend as too dam cold out (- temps) what size are the hold downs as I think I will need a crowsfoot to get to them as attempted with a wrench and really couldn't get on them very well

when tightening them do I need to loose the return lines or injector connections?

Thanks

[CumminsPower59]

You'll have to pull the line off the injectors to get a good bite on the hold down nut. Factory spec is 44lb-ft, but I have gone a bit past that to keep them from bubbling...like 50-55lb-ft.

[RCCUMMINS89]

Yep... pull a valve cover or two and you can swing the injection line out of the way easier. DON'T OVERTIGHTEN the valve cover bolts either, they will leak.

[PToombs]

You can pull the injector and return lines and torque it with a deep socket, or just snug it a little with a wrench. If you have more than 1 or 2 leaking, I'd say torque them all.