EEK#@&%
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Senior User
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From: Terrace, B.C.
EEK#@&%
Hi Guys - R & R'd my mechanical pump on '93 IDI 7.3. She's running with plenty of fuel pressure at the top filter but smokin now lots
Any suggestions, is it unburnt fuel due to air in the system? There was no smoke prior to pulling the old pump, I need to prove my wife wrong - ie buying a diesel was not a bad choice 
.
Any suggestions, is it unburnt fuel due to air in the system? There was no smoke prior to pulling the old pump, I need to prove my wife wrong - ie buying a diesel was not a bad choice .
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Senior User
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From: Terrace, B.C.
Well, I just idled it for a few minutes, it seemed to be missing a bit but no knocks or nasty sounds from the engine. The smoke was pretty much continuous tho. Maybe a bit of driving will clear it up - I hope.
Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
I hope you followed the lift pump installation instructions to a T ... Serious damage can occur if incorrectly done.
Did you bleed the air out after installing ... Not that it matters now if you got it running.
If it's air in the system and you got it running it should clear up within minutes, if not something else happened and more info is needed.
-Enjoy
fh : )_~
Did you bleed the air out after installing ... Not that it matters now if you got it running.
If it's air in the system and you got it running it should clear up within minutes, if not something else happened and more info is needed.
-Enjoy
fh : )_~
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From: Terrace, B.C.
I followed the instructions as clearly as I could and the pump went on nice and flat with no resistance really. I can understand that damage could occur because it would contaminate the case in no time with two bit parts from the pump actuator. Also talked to a buddy of mine who is well versed on these engines (and diesels in general) and he figured I had it on correctly. Just out of curiousity, if a person was to turn the engine through by hand in the wrong direction a time or two (prior to start up) would that screw things up
Also, is there a timing issue if the engine is cranked with the fan belt off??
Also, is there a timing issue if the engine is cranked with the fan belt off??
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From: Terrace, B.C.
I probably sound like a goof here, but do you guys know what direction the engine would turn - looking from the front I turned it clockwise by hand.
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Methanoholic
Joined: Mar 2009
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From: Maine (NorCal Native)
Rotating the motor forward or backwards by hand is not going to hurt it.
Rotation direction is actually called Counter Clockwise ... HOWEVER standing in front of the truck looking at the motor it rotates Clockwise.
No timing issue with belts off.
Sounds like you got the lift pump on ok, it should not have resistance.
If it's run for more than 5 minutes then air is gone... Unless it's sucking air pre lift pump. ie: between tank and lift pump.
Does it idle smooth?
Start cracking injector lines at the injector one at a time. You should get the same sound change from each one...
-Enjoy
fh : )_~
Rotation direction is actually called Counter Clockwise ... HOWEVER standing in front of the truck looking at the motor it rotates Clockwise.
No timing issue with belts off.
Sounds like you got the lift pump on ok, it should not have resistance.
If it's run for more than 5 minutes then air is gone... Unless it's sucking air pre lift pump. ie: between tank and lift pump.
Does it idle smooth?
Start cracking injector lines at the injector one at a time. You should get the same sound change from each one...
-Enjoy
fh : )_~
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Senior User
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From: Terrace, B.C.
Thanks for that, it could be sucking some air prelift pump as the rubber line at the inlet looked a little crappy, would that cause grey/white smoke. It is also idling a bit rough but only ran it for maybe 3 minutes.
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
your just seeing the white smoke at startup now,because you were not looking for it when you ran the truck.
just run her,and see if the smokes disappears.
the smoke your seeing at cold startup is likely normal.it should go away in a few minutes.
i think your just nervous because you just bought the truck?
just run her,and see if the smokes disappears.
the smoke your seeing at cold startup is likely normal.it should go away in a few minutes.
i think your just nervous because you just bought the truck?
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
You need to get it up to operating temp.
Yes, Air could cause the rough idle and smoke, It will also Surge.
Surge = RPM goes up and down when holding throttle steady.
-Enjoy
fh : )_~
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From: Terrace, B.C.
Good day, thanks for the input - yes, I am sure the smoke is due to just not warmed up as well as the surging as you said Festus. I was a bit freakydeaky about not having the lift pump on properly and reading more in that is there. That being said, still havent had her out for a run but am sure it should be ok..
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
I haven't done it (installed one wrong) so I don't know for sure, But I got a good feeling if the lift pump was installed incorrectly you would already be crying in the broken parts!
It would of been noisy and obvious.
Paranoia can save one money, it can also drive one nuts!
Unfortunately I know both sides ...
-Enjoy
fh : )_~
It would of been noisy and obvious.
Paranoia can save one money, it can also drive one nuts!
Unfortunately I know both sides ...
-Enjoy
fh : )_~
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Senior User
Joined: Jun 2009
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From: Terrace, B.C.
She seems to be running pretty good now, no more smoke so just needed a warm up and get some air out. Thanks for your help, my next issue is its still dredging up oil in the rad from a year ago almost when the oil cooler went for a crap. I don't think the guys ever flushed things properly. Oh well..