Genuine Mazda Alternator Adjustment Bracket / Strap – 1.6
Replacement Genuine Mazda alternator adjustment bracket for Mazda MX-5 Mk1 NA models fitted with the early 1.6-litre B6 petrol engine.
The bracket forms part of the upper alternator mounting and auxiliary-drive-belt adjustment mechanism. It supports and locates the adjustment hardware used to move the alternator and set the correct alternator and water-pump drive-belt tension.
Once the belt tension has been adjusted, the bracket and associated fasteners hold the alternator securely in position. A bent, cracked, corroded or damaged bracket can prevent accurate adjustment, cause pulley misalignment or allow the alternator to move in service.
One adjustment bracket is fitted per vehicle, and this listing supplies one Genuine Mazda bracket. The adjuster spacer block, adjustment bolt, fixing bolts and alternator are not included.
Important fitment restriction: B61P-18-360A is confirmed for the original early Mk1 NA 1.6 alternator mounting arrangement. Later Mk1 1.6, Mk1 1.8 and Mk2/Mk2.5 models may use different brackets or adjustment hardware and should not be assumed compatible.
- Part type: Alternator adjustment bracket
- Common names: Alternator strap / adjuster bracket / belt-tension bracket
- Mazda catalogue description: Strap, Alternator
- Location: Upper alternator mounting and adjustment mechanism
- Engine application: Early 1.6-litre petrol engine
- Primary engine code: B6-ZE
- Function: Supports the alternator adjustment hardware and belt-tension setting
- Quantity fitted per vehicle: 1
- Quantity supplied: 1 bracket
- Adjuster spacer block included: No
- Long adjustment bolt included: No
- Bracket fixing bolts included: No
- Alternator included: No
- Drive belt included: No
- Brand: Genuine Mazda
- Part No.: B61P-18-360A
- MX-5 fitment: Early Mk1 NA 1.6 models
Typical reasons for replacement:
- Bracket bent or distorted
- Adjustment slot or mounting aperture enlarged
- Bracket cracked around a fixing point
- Heavy corrosion or weakened metal
- Original bracket missing
- Alternator cannot be aligned correctly
- Drive-belt tension cannot be retained
- Replacement of previously fitted non-standard hardware
Fitment advice: Confirm that the vehicle retains the original early Mk1 1.6 alternator mounting arrangement. Compare the bracket shape, fixing points and associated adjustment hardware with the removed component before ordering.
Replacement advice: Inspect the bracket fixing points, adjuster spacer block, adjustment bolt, lower alternator pivot bolt and alternator mounting ears. A replacement bracket will not correct damaged engine threads, a cracked alternator casing or seized adjustment hardware.
Other items to consider: Inspect the alternator and water-pump drive belt for cracking, glazing, fraying or contamination. Check the crankshaft pulley, water-pump pulley, alternator bearings and all associated mounting fasteners.
Useful tools / consumables: Socket and spanner set, calibrated torque wrench, penetrating fluid, wire brush, thread-cleaning tools and suitable belt-tension measuring equipment.
Difficulty guide: DIY Difficulty: Easy to Moderate. Replacement requires loosening and supporting the alternator, followed by correct reassembly and drive-belt adjustment.
Why Genuine Mazda? Genuine Mazda alternator brackets match the original mounting-point positions, material thickness, adjustment geometry and hardware alignment. Correct geometry helps maintain pulley alignment and allows the alternator to move through its intended adjustment range.
What’s in the box: One Genuine Mazda alternator adjustment bracket / strap, part number B61P-18-360A.
Installation notes: Disconnect the battery before working around the alternator. Support the alternator and loosen the lower pivot and upper adjustment hardware. Remove the original bracket and inspect the surrounding mounting points and fasteners. Position the replacement bracket in the original orientation and install the correct Mazda hardware without forcing or cross-threading it. Adjust the alternator until the drive belt reaches the specified tension, then tighten the pivot, bracket and adjustment fasteners to the applicable Mazda specifications. Recheck belt alignment and tension after installation.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Mazda | MX-5 | Mk1 NA – Early 1.6 | NA6C | 1990–1993 | 115 | B6-ZE | Petrol | Manual / Automatic | Upper alternator adjustment bracket / strap; one fitted per vehicle; later 1.6, 1.8 and Mk2 arrangements may use different hardware |
| Vehicle Manufacturer | OEM Reference Number |
|---|---|
| Mazda | B61P-18-360A |
| Mazda | B61P-18-360 |