I noticed that when I run my truck up to 2000 RPM or so, it makes this weird high pitched screeching/rattling sort of noise...it sort of comes in gradually, then doesn't go away until you drop the RPM's.
What would that be? I can't really even tell.
__________________ '94 F250 XLT- IDI Turbo, 5 speed, 4x4, manual hubs. ATS upgrade, 3" downpipe, 4" exhaust. Autometer pyrometer & boost gauges. More coming. '87 Thunderbird Turbo Coupe
Lots of mods & pretty quick.
bearing in idler pulley, bearing in air cond clutch, bearing in alt, bearing in water pump???? take the belt off--and spin things by hand--you may feel one of the bearings dry or ruff---
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94 f250 idi turbo sc e4od alum fac rims 149,289 --dana 60 frt with posi--10.25 rear w/posi--shouldnt get stuck!! ats turbo 3" parts on--what a diff from stock turbo!!!!!--- also 96 F250 with 305,000 is fixed!!-- 7.3 rattler-also 85 6.9-needs new engine!! tired!!
I had a similar situation one time. Ended up being the vacuum pump. With the belt off, you can definately tell if a bearing is bad by spinning the pulleys by hand. I would look hard at the vacuum pump and alternator.
Josh
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85 F350 6.9 T-19 flatbed
straight pipe drw dana 70
4.10s 15 leafsprings per side
boxed frame
1100 cca batts
(sold)84 F350 7.3 T-19 XL dually
straight pipe 1100 cca batts
dana 70HD 4.10s
homemade cowl induction
powerstroke oil filter
and the water pump, and the air cond clutch idle bearing-----------------------
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94 f250 idi turbo sc e4od alum fac rims 149,289 --dana 60 frt with posi--10.25 rear w/posi--shouldnt get stuck!! ats turbo 3" parts on--what a diff from stock turbo!!!!!--- also 96 F250 with 305,000 is fixed!!-- 7.3 rattler-also 85 6.9-needs new engine!! tired!!
__________________ http://photos.thedieselstop.com/show...0/ppuser/28329
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93 has 160K+, it's basically a stock truck with all the Ford options, just no disc player.
Toys: 26'Jayco FK TT, 18'Sylvan Pro Fish.
Do you have a mechanics stethescope...... if not get a rolled tube like in Christmas wrap and listen all over the engine to isolate it.......or whatever you feel safe to use where wirling blades and belts are moving etc......
Did you try the idler pulley just below the tensioner....... there are 2 thin metal belt guide plates.. one on each side of the pulley.......
__________________ http://photos.thedieselstop.com/show...0/ppuser/28329
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93 has 160K+, it's basically a stock truck with all the Ford options, just no disc player.
Toys: 26'Jayco FK TT, 18'Sylvan Pro Fish.
Proud Canadian BOOB man too!!
Last edited by cdnsarguy : 04-08-2008 at 01:26 PM.
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