---
title: "Fiat 500 Classic – Tightening torques"
url: "https://www.fiatvanderlaan.com/kb-docs/fiat-500-classic-tightening-torques/"
updated: "2025-06-30"
category: General
---

# Fiat 500 Classic – Tightening torques

This page is to indicate the torque values for different parts of the Fiat 500. All values are in Nm!

### Motor

 Cylinder head nut[40**1)** (click)](https://www.fiatvanderlaan.com/kb-docs/fiat-500-classic-tightening-torques/#8-toc-title)Main bearing front and rear 30Drive rod bearing caps35Flywheel bolts 35Camshaft gear bolts 10Centrifugal oil filter8Hollow bolt pulley on crankshaft150Nuts rocker shaft25Nut fan on alternator35Nut pulley on alternator35Spark plugs30Bolt of rear engine mount (R/126)50Rear motor support to intermediate panel50

### Gearbox and differential

 Suspension rubber on gearbox15Gearbox support40Mounting suspension rubbers of gearbox15Mounting bolt of clutch fork25Nut of clutch cable bracket15Gearbox to engine (flywheel housing)25Flywheel housing to gearbox35Crown nut of pignon shaft[50** 2)** (click)](https://www.fiatvanderlaan.com/kb-docs/fiat-500-classic-tightening-torques/#9-toc-title)Crown nut of tower gear shaft[50** 2)** (click)](https://www.fiatvanderlaan.com/kb-docs/fiat-500-classic-tightening-torques/#9-toc-title)Locking bolt for shaft of reverse gear15Crown wheel bolts45Differential bearing holders15

### Front wheel suspension

 Self-locking nut of leaf spring to steering knuckles40Self-locking nuts of half arms on wheel hub shaft25Rubber bumpers on leaf spring15Leaf spring mounts to bodywork30Wheel hub shaft to bodywork30Wheel hub to steering knuckle 60Lower and upper shock absorber mounting20Wheel bolts50Hub nuts[**3)** (click)](https://www.fiatvanderlaan.com/kb-docs/fiat-500-classic-tightening-torques/#10-toc-title)

### Steering

 Steering wheel nut 50Mounting bolt of universal joints on steering shaft25Mounting of steering box30Serrated nuts of attachment of steering shaft holder15Attaching the auxiliary steering box30Auxiliary steering box on shaft70Pitman arm on shaft10Tie rod steering ball joints 35Rod end clamps15

### Rear wheel suspension

 Rubber bumpers on bodywork15Support of wishbone to bodywork50Silent-bloc bolts of wheel support arms80Lower and upper shock absorber mounting30Wheel hub and brake anchor plate at wheel wishbone55Drive shaft to flexible coupling28Central nut of flexible coupling[**4)** (click)](https://www.fiatvanderlaan.com/kb-docs/fiat-500-classic-tightening-torques/#11-toc-title)Wheel bolts 50

### Brakes

 Brake anchor plate to steering knuckle20Bolts for brake drum to hub85Wheel brake cylinder to brake anchor plate10Handremsteun aan carrosserie15

### Electrical installation

 Belt pulley of alternator20Nut of cooling air fan20

### Notes

#### **1)**

First tighten to a value of 25 Nm. Then to a value of 40 Nm.

 ![](https://www.fiatvanderlaan.com/wp-content/uploads/kb-docs/fiat500_cylinderhead_sequence-1024x1024.jpg)Tightening order of head nuts

#### **2)**

If at the prescribed tightening torque the holes in the nut and the shaft do not match, the nut must be tightened to a maximum of 60 Nm. Always secure this nut with a cotter pin!

#### **3)**

Setting the bearing clearance on a hub nut requires accuracy. First, make sure the hub is mounted correctly and that all parts are clean. Always use new nuts for reliability and safety. Tighten the hub nut to a torque of 20 Nm. Then turn the hub around a few times to allow the bearings to set and loosen the nut. Then tighten the nut to a torque of 7 Nm. Then it should be slackened 30 degress, this angle is half one flat of the nut. Make a mark on the washer behind the nut with a punch, level with a corner of the nut. Then slacken till the next flat of the nut is by the mark. Now lock the nut by staking it with a chisel into the groove in the stub axle (always use new nuts). Measure the axial bearing clearance with a clock micrometer, which should be between 0.025 and 0.10 mm. If necessary, adjust the nut to stay within these tolerances. Secure the hub nut by tapping some material into the groove of the shaft journal so that the nut will not come loose. Use an appropriate tool for a firm lock. Fill the hub cap with about 25 grams of grease for proper lubrication of the bearings and gently tap the hub cap back into place.

#### **4)**

When installing new rear wheel bearings or a new flexible coupling, it is essential to use a new spacer bushing. The old spacer is deformed and therefore no longer usable. After the bearings are packed with wheel bearing grease and installed in the hub together with the axle journal, a new spacer, the retaining rings and the spacer, slide the flexible coupling onto the axle journal. Tighten the nut on the end of the axle journal until the bearings are under preload such that a torque of up to 0.5 Nm is required to twist the axle journal.