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CATEGORY LISTINGS > INTERNATIONAL > PROBLEM 7.3 [ REFRESH ]
Thread Title:

PROBLEM 7.3


Created On Wednesday October 16, 2002 00:08 Diesel Talk
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DE1
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Joined: Oct 2002

Note Wednesday October 16, 2002 00:08 View thread in raw text format
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TextI HAVE A 1993 FORD F350 7.3 THIS TRUCK HAS A 1990 MOTOR. WE JUST PUT IT IN LAST WEEK -I HAVE ABOUT 500 MILES ON IT . THIS MOTOR RAN FINE IN THE OTHER TRUCK,AND HAS BEEN FINE FOR 500 MILES IN MY TRUCK. TODAY WHEN I STARTED IT IT MADE A RAPPING NOISE-RUNS LIKE ITS ON 7 CYLS-AND SMOKES BLUE IN COLOR ???????????????????????????


DE1

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Uselessdog
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Joined: Oct 2002

Note Friday October 18, 2002 02:54 View thread in raw text format
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Blue smoke is usually caused by lubricating oil, and you said it makes a rapping noise and
is running on seven cylinders. It sounds like it might have broken a piston. I've seen it in
a couple of those engines in the fleet where I work. Not good!! Depending on how bad
it smokes and raps, you could run it and crack the injection lines to see which cylinder is
causing the problem and then pull the appropriate cylinder head. The problem is that
at least with the ones we had the cylinder walls got damaged, when the pistons broke,
to the point that they couldn't be repaired. There could be some kind of foreign material
on top of one of the pistons and may have damaged the injector, but that would not
account for the blue smoke. Post back with info on skip test.
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chad
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Joined: Jan 2003

Note Wednesday January 08, 2003 22:59 View thread in raw text format
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Here's what I would do to diagnose your problem
1 Crack the injector lines one at a time and see which one does not change the engine RPMS
2 Remove that injector and swap it with any other one on the engine
3 Start the engine and let it run for a few minutes
4 Crack the injector lines again
5 If it is the same cylinder, you have a valve or piston problem
6 If it is the other cylinder, the one you swapped injectors with, you have a bad injector
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painthorsman
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Joined: Jun 2003

Note Saturday June 07, 2003 14:43 View thread in raw text format
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If you still have this engine and the sudden oil smoke and noise wasnt the result of some type of abuse... ie over revving while going down a hill etc., it is most likely the result of a burned out glow plug, coming apart and landing on a piston, breaking the piston due to the small clearances between piston and head... have seen this happen several times
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CATEGORY LISTINGS > INTERNATIONAL [ REFRESH ]
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