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mystery noise, is this fan clutch
Under acceleration or load I am hearing a noise that is kind of a hiss or dragging kind of sound that seems to follow endine speed. This sound dissapears at steady speed and will return about a fraction of a sec after you floor it. With the hood up I cant hear anything similar while revving the engine. So, probably something fan related right? If the fan clutch or bearing is bad how do I know or test?
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84 300SD 274K 38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD. |
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Could it be the turbo? That would explain why you don't hear it if the engine isn't under load. Are you able to turn your fan by hand? (when the engine is off of course) Should have some resistance but not be totally stiff.
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k |
#3
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hose
check the rubber hose on the side of the turbo, i have seen some split and cause this noise, about the diameter of a AA battery
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I doubt the sound is related to the fan or fan clutch because it is related to the engine being under load. The fan doesn't "know" is the engine is under load or not.
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Front wheel bearings??
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
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Ah-ha. Yes there is a hose broken. It is about the diameter of a AA bat. It goes from down low on the turbo to up on the turbo at the intake and is broken at the top. What does this do? If there is vacuum at the top end going into the intake then its probably a certanly that my car has been inhailing engine grime for at least a week.
The fan will move freely back and forth and feels smooth in consistant on its shaft. It has about 1mm of play in and out and when flexing left and right has a little play. Im curious now about fan design. I am going to post that in a new thread. |
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__________________
Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo |
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The reason Im curious about this is a Cummings mpg guide refrencing drivetrain losses and specifically went into detail about fan. I think a few of the guys on the Ford forum have done electric fan retrofits. Not that Im considering this for my merc, just figuring stuff out. |
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hose
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Fuel rated hose will work just fine. It gets "sorta" warm in there but not too bad. All it needs to be able to do is withstand the oil that gets in there sometimes.
If you don't replace it, you will have boost in excess of 28+psi and this will make your overboost protection valve kick in which will make your car surge under heavy acceleration. Ask me how I know |
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