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horn like sound when engine revs

jeradcdn

Active Member
Joined
Mar 5, 2018
Messages
31
Location
Alberta, Canada
John deere 644k, when the engine is revved up, there is a loud horn type sound coming from the engine compartment. no codes, coolant level full, replaced air filters thinking maybe one was collapsing. Don't see any clamps off anywhere.
any suggestions?

thanks in advance
 

ChuckRock

Well-Known Member
Joined
Oct 1, 2021
Messages
58
Location
Western USA
check air connections on pressure side of turbo

I bet Dave is right in the thinking that it is a boosted air leak. You can isolate charge air system and slowly pressurize the system using compressed air to check. I wouldn't go above 25 psi, if it is a leak in the system you'll find it way before that.
 
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