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AC 2018BL
MULTI-BRAND COMPRESSION GAUGE PETROL-DIESEL/DCI
- 32 connectors
- Connectors 10mm
- Connectors 12mm
- Connectors 18mm
- Spacer 6.4mm
- Spacer 6.5mm
- Spacer 19mm
- Spacer 26mm
- Spacer 38mm
- Pillar ssembly
INSTRUCTIONS
Overview of Compression Testing
When an engine's performance is down, or if misfiring occurs which cannot be attributed to
the ignition or fuel systems, a compression test can provide diagnostic clues as to the engine's
condition.
Compression should build up quickly in a healthy engine. A very low compression reading on the
first stroke, followed by gradually increasing pressure on successive strokes, indicates worn piston
rings. A low compression reading on the first stroke, which does not build up during successive
strokes, indicates leaking valves or a faulty head gasket (a cracked head could also be the cause).
Deposits on the undersides of the valve heads can also cause low compression.
If the pressure in any cylinder is considerably lower than the others, introduce a small quantity of
clean oil into that cylinder through the access hole, and repeat the test.
If the addition of oil temporarily improves the compression pressure, this indicates that bore or
piston wear is responsible for the pressure loss.
If there is no improvement, it suggests that the leakage is around the valves, or a faulty head
gasket. A low reading from two adjacent cylinders
suggests a faulty head gasket between the two cylinders. The presence of coolant in the engine
oil will confirm this.
If the compression is unusually high, the combustion chambers are probably coated with carbon
deposits.
If this is the case, the cylinder head should be removed and de-carbonised.
As a rough guide, engines having a compression pressure in excess of 100psi (6.9 bar), should not
exceed a compression loss of more than 10psi (0.69 bar). On older engines with lower compression
pressure, loss should not exceed 0.35 bar (5psi).
CONTENTS
- Bridge (small)
- Bridge (medium)
- Bridge (large)
- Hose and connector14mm
- Elbow connector
- Gauge 600psi 40bar, 77mm OD
- Gauge hose
- Valve and washer set
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