Perkins 103 — How to do a compression test
Testing & diagnosis · Engine
For the Perkins 103, from the Perkins service manual.
Applies to: Perkins 103
Procedure
- Ensure the battery and starter motor are in good condition and the battery is fully charged.
- To prevent the engine starting, disconnect the engine stop solenoid or set the engine stop control to the 'stop' position.
- Ensure the valve tip clearances are set correctly.
- Remove the atomisers.
- Fit a suitable gauge into the atomiser hole of the cylinder to be tested.
- Operate the starter motor and record the pressure; repeat for each cylinder.
Tools required
- Compression gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- If one or more cylinders vary by more than 350 KPa (50 lbf/in²) those cylinders may be faulty
Full service-parts list: Perkins 103 →
Source: Perkins service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.