Question 1

How can I tell if I need the tensioner assembly or just the pulley?

Accepted Answer

If the bearing is showing wear chances are the tensioner spring is not far behind.  Replacing the assembly is your best bet.  For some reassurance, you can judge the condition of the tensioner yourself.  A tensioner will usually have a groove on the arm where it meets the spring housing which determines the arm's range of movement.  With the tensioner and belt installed, note the position of the tensioner relative to the block.  When removing the belt, notice the position of the arm when fully open and when fully released.  These three points should give you an idea as to the tensioner's wear.  When the tensioner is new, I usually come very close to the fully open position to slip on a new belt.  Likewise, I've seen trucks with whining and disintegrating belts due to worn tensioners that were close to the resting position when installed (no tension).

Question 2

where is it made

Accepted Answer

If the bearing has no nomenclature then more than likely China. If the bearing has a name and part then look that up as ref to when it is assembled. Cheap bearings from China may not have seal with recessed edge allowing grease to seep over time. They tun cheap and are noisy.

Question 3

what size bolt will fit this i have a 94 mazda b3000?

Accepted Answer

This is the same part for my '04 Ford Explorer Sport Trac.  Mine uses an M10 flanged bolt but I don't remember the length or thread pitch.  It's not a stretch bolt so you can reuse it if it's in good shape.  I reused mine and torqued it to 35 lb-ft.  If it's not in good shape, have it matched at a local auto parts store.  My local Home Depot stocks a nice assortment of Class 8.8 M10 flanged bolts as well.

Question 4

Will this fit 1998 chevy s10 4.3l 4x4?

Accepted Answer

Yes

ASIN	B000C2SGT8
Belt Style	Lign
Best Sellers Rank	#70,979 in Automotive ( See Top 100 in Automotive ) #19 in Automotive Replacement Idler Pulleys
Brand Name	Gates
Color	Black
Compatible Devices	Truck
Customer Reviews	4.6 4.6 out of 5 stars (1,056)
Global Trade Identification Number	00072053415254
Included Components	DriveAlign Belt Drive Idler/Tensioner Pulley
Item Type Name	Gates 38001 DriveAlign Belt Drive Idler/Tensioner Pulley
Item Weight	10.24 ounces
Manufacturer	Gates
Material Type	Alloy Steel
Number of Items	1
Part Number	38001
Style Number	38001
UPC	720534152548 072053415254
Unit Count	1 Count
Warranty Description	Please contact retailer/seller for assistance

Gates 38001 DriveAlign Belt Drive Idler/Tensioner Pulley

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