Perkins — How to do a compression test
Testing & diagnosis · Engine
From a Perkins service manual — check it applies to your exact model before use.
Browse Perkins generators & specs →
Before you start
- Ensure the engine cannot start
- Ensure battery is in good condition and fully charged
Procedure
- Ensure valve tip clearances are set correctly
- Remove the atomisers
- Fit a suitable gauge into the atomiser hole of the cylinder to be tested
- Disconnect the stop solenoid or put the stop control in the no-fuel position
- Operate the starter motor and note the pressure indicated on the gauge
- 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
- Results within 2000/3500 kPa (300/500 lbf/in2) 21,0/35,0 kgf/cm2
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.