Question about Ford E-350

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Squealing Smog Control Belt in Humid Climate

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:''Table Normal''; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:''''; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:''Times New Roman'';}Make of vehicle: 1987 Ford
Model of vehicle: Econoline E-350
Engine size and type (v-6,v-8, 4cyl, etc.): Ford V-8 (460 cuin gasoline); auto trans
Miles on vehicle: 87,000
Any known codes stored: No
Give a brief history of the problem:
The smog control belt, which appears to be in good conditionand isn’t that old (I had all belts changed out when I had a power-steering problem repaired), squeals loudly when the engine is started and it isn’t justmomentarily when the engine is speeded up. The smog pumps are driven off thealternator pulley. The tightness test is ¼” deflection, which it is at, appearspretty tight and a great strain on the alternator bearings. What would resultif the smog control pumps drive belt was removed, or the smog pumps andhardware was removed altogether?

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  • Anonymous Mar 16, 2014

    remove and replace the smog pump on a 1995 ford f-150 351 windsor engine

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I will list some of my experiences with similar problems.

V-belt quality and grade vary a lot and I do mean a lot. Belts can take a set from sitting--anybody with a table saw will attest to this. I would try a new belt first after finding a good parts man. A good alternator shop (rare today) can help here. The smog pump belt is an easy one to change. Try the cheap stuff first.

Smog pumps in my experience do not need a lot of power, especially at idle, but I have had bearing and pump failure on several wipe out a belt. Pull the belt and spin the smog pump by hand.

Belts can glaze and it is not necessarily noticeable. Stamped-steel pulleys polish smooth and won't transmit the power needed. Pulleys can also wear in some strange shapes so a new belt does not fit properly. See if an alternator shop has a cast iron pulley for the alternator. Cast iron does not polish smooth and also wears off any glaze from the belt surfaces. The crank pulleys are stamped-steel but are larger in diameter with a longer wrap angle so slippage is not a problem there.

In my poor days I tried sanding the belts and pulleys to remove the glaze. Too much work and it was only temporary.

I have used a cast iron pulley on a 110 amp alternator with a winch load. A stamped-steel pulley would just smoke the belt when under load (winch drew 225 amps total!). My truck is 70 amp and that is the biggest alternator Ford has with a V-belt that I know of.

I considered removing my smog pump and associated hardware. My experience has been to leave everything intact unless I can replace everything with an earlier, non-smog engine. Doing everything piecemeal has just caused other problems.

Hope this helps.

Posted on Apr 08, 2009

  • dan lincoln Apr 21, 2014

    where you live, can you call the state emissions inspection info line? it may be old enough now to remove that system, and all that weight, and problematic hardware and plumbing

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