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Ihave an n14 cummins in my peterbilt making a loud hammering…

Customer Question
Ihave an n14 cummins...

Ihave an n14 cummins in my peterbilt making a loud hammering noise trying to figure out possible issues

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Just in between first and second head puff of exhaust is released on start up runs fine pulls fine temps ok pressure ok .. just loud hammering noise

Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Customer reply replied 2 years ago
just waiting for the answer or a response?
Answered in 12 minutes by:
2/28/2016
Technician: Daniel Wilson,
 replied 2 years ago
Daniel Wilson
Category: Medium and Heavy Trucks
Satisfied Customers: 6,884
Experience: Owner at DJ Wilson
Verified

Hi my name is***** will be glad to help. What is your engine serial number and are you getting any fault codes? This could be a mechanical failure like a rod, piston, push rod, rocker arm etc or most commonly if all those check out ok is a faulty injector or Jake brake problem. Is the check engine light coming on and if so what codes do you have?

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Technician: Daniel Wilson,
 replied 2 years ago

Check the oil and filter for signs of metal/debris indicating a mechanical internal failure and if clean do an injector cutout test if misfiring to isolate a possible faulty injector or injector harness. Let me know

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Customer reply replied 2 years ago
no engine light no fault codes oil and filter just changed no sign of any debris or leaks exhaust manifold and intake manifold just replaced all turbo gaskets replaced
Customer reply replied 2 years ago
serial number is *****
Customer reply replied 2 years ago
how do you do an injector cut out test?
Customer reply replied 2 years ago
runs fine no loss of power no other indication of an issue other than loud hammering noise ...louder when sitting at idle and the puff of smoke when first started up
Customer reply replied 2 years ago
just a rhythmic consistent hammering noise seems to smooth out a little when running at higher rpm
Technician: Daniel Wilson,
 replied 2 years ago

Were any of the exhaust ports wet with oil/fuel for any cylinders? Using a digital temp reader take temps for each exhaust port looking for a cold cylinder indicating a potential injector problem. Then using noid lights from an auto store check for strong injector voltage for potential injector driver issues in the ECM or injector harness problems. If that checks ok then using Cummins Insite you can do an injector cut out test or unplug each cylinder one at a time and listen for a change

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Technician: Daniel Wilson,
 replied 2 years ago

A cylinder with little to no change is a problem cylinder

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Technician: Daniel Wilson,
 replied 2 years ago

Once you have isolated a problem Cylinder, remove that valve cover if the harness checked good and inspect the rocker arms and wiring for damage to the injectors

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Technician: Daniel Wilson,
 replied 2 years ago

Hi, Did you get this resolved or still need help?

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