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Fox Body Mustang 5.0 Serpentine Belt Routing Diagram - Stock & Short Belts
Reference · 1980-1986 BroncoAll 34 schematics
Belt routing diagrams comparing 84.5-inch and 70.5-inch short belts to the stock 5.0 serpentine belt path with explanatory notes.
Part of 1980-1986 Ford Bronco Schematics
This document is a computer-drawn schematic showing three serpentine belt routing options for the 5.0L engine in Fox-body Ford Mustangs. The bottom diagram (green) shows the stock 5.0 belt routing with all accessories labeled: tensioner, A/C compressor, alternator, water pump, smog pump, crankshaft pulley, and power steering (P/S) pump. The upper-left diagram (blue) shows an 84.5-inch short belt routing that bypasses only the smog pump, while the upper-right diagram (red) shows a 70.5-inch short belt that bypasses both the smog pump and the power steering pump. The text explains that in the short-belt routings, the belt wraps opposite sides of the crank and water pump pulleys compared to stock; the crank pulley always spins clockwise, the water pump pulley counter-clockwise, and all accessories spin clockwise. Belt lengths given are for a car with underdrive pulleys; stock-pulley cars require different lengths but identical routing. Drag strip testing on a stock 1990 5.0 Mustang 5-speed showed the 70.5-inch belt improved ET by about 2 tenths and trap speed by 1.5 mph, while the 84.5-inch belt showed no measurable gain. It also warns that permanently bypassing the smog pump will shorten catalytic converter life.
This document covers 1990 (test vehicle; applies to Fox body, which may differ from this 1986 Ford Bronco.
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Frequently asked questions
- What belt length bypasses the smog pump on a Fox body 5.0 Mustang?
- An 84.5 inch belt bypasses only the smog pump (with underdrive pulleys installed; stock pulleys require a different length).
- What belt length bypasses both the smog pump and power steering pump?
- A 70.5 inch belt bypasses both the smog pump and the power steering pump on a Fox 5.0 with underdrive pulleys.
- Does a short belt improve performance on a 5.0 Mustang?
- Per the document, the 70.5 inch belt gave about a 2-tenths decrease in ET and 1.5 mph gain in trap speed on a stock 1990 5.0 Mustang 5-speed; the 84.5 inch belt showed no measured gain.
- Which direction do the pulleys spin with the stock belt routing?
- The crank pulley always spins clockwise, the water pump pulley always spins counter-clockwise, and all accessories spin clockwise with the crank pulley.
- Is it safe to bypass the smog pump permanently?
- The document says if you run catalytic converters, permanently bypassing the smog pump is not recommended because it will decrease catalytic converter life.
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