what is this sound
Discussion in 'Freightliner Forum' started by shatteredsquare, Nov 29, 2020.
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I assume you’re referring to the noise that’s occuring roughly every 2 seconds?
Rideandrepair Thanks this. -
yeah that pulsing click sound, it's linked to RPMs, higher RPMs and it picks up the cadence. pretty sure something fuel system related, it's coming from the Bosch thing behind fuel filters. no fuel issues at all, MPG fine, timing fine, power fine. just a whole lot of clicking...
Rideandrepair Thanks this. -
I've heard that before on occasion. I don't think it's a problem. Maybe it's the DEF system pulsing fluid?
Rideandrepair and D.Tibbitt Thank this. -
This must be a detroit. I had a freightliner with detroit that did this non stop..
Rideandrepair, MACK E-6 and shatteredsquare Thank this. -
Rideandrepair and D.Tibbitt Thank this.
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O.K. Now we are getting somewhere! What you have is an injector(s) that have a cracked seat face. Where the injector meets the injector cup face there is a copper washer. Under the washer the injector nozzle seat has a crack. I have dealt with this "chirping" many times. Detroit solution is to replace all 6 injectors since it will probably eventually happen to all of them anyway. Mucho $$, so you can pull and inspect, sometimes magnifying class is needed, and replace only defective ones. Good news is Bosch identified problem a while ago and new injectors don't have this problem.
magoo68, xsetra, Rideandrepair and 3 others Thank this. -
BoostedTeg, D.Tibbitt and shatteredsquare Thank this.
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D.Tibbitt Thanks this.
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