DF140 pressure and engine report

[silvertriton]

Hi I am buying a contender 23 open with twin DF140 (2003) with 1300hrs.
we have done a cylinder pressure check (using a Yamaha kPa pressure gauge) and we were able to test only the top 3 cylinders with these results
kPa: 900/1000/975 - 1050/1050/1050
I understand tha these correspond to approx. 140-150 PSIs. Since the normal range should be 1200-1600 kPa or 171-228PSI should I be concerned?
I would be very grateful for any comments>
Best regards


This is also the computer report I received:
Comment
Engine No. 371437-
Boat Type 140
Description stefano
Engine information
Power 140PS
ECM ID 33920-92J10
Spec. ---
Engine Type 4 stroke 2045cc
SERVICE DATA
Item Data Unit
ENGINE SPEED 1000 rpm
MANIFOLD ABSOLUTE PRESSURE 256 mmHg
MANIFOLD ABSOLUTE PRESSURE 34.1 kPa
MANIFOLD ABSOLUTE PRESSURE 10.09 inHg
BAROMETRIC PRESSURE 753 mmHg
BAROMETRIC PRESSURE 100.4 kPa
BAROMETRIC PRESSURE 29.68 inHg
CYLINDER TEMPERATURE 40 °C
CYLINDER TEMPERATURE 103 °F
INTAKE AIR TEMPERATURE 38 °C
INTAKE AIR TEMPERATURE 100 °F
BATTERY VOLTAGE 14.5 V
FUEL INJ. PULSE WIDTH 3748 µs
INJECTED FUEL AMOUNT 13 mcc
FUEL PUMP DUTY 56.4 %
IAC VALVE DUTY 47.5 %
NO. OF MAP SENSOR FAILURE 1 times
NO. OF CKP SENSOR FAILURE 4 times
NO. OF IAC VALVE FAILURE 0 times
NO. OF CMP SENSOR FAILURE 0 times
NO. OF CTP SWITCH FAILURE 0 times
NO. OF CYL. TEMP. SNSR FAILURE 1 times
NO. OF IAT SENSOR FAILURE 1 times
NO. OF EX. TEMP. SNSR FAILURE 0 times
NO. OF FUEL INJECTOR FAILURE 0 times
NO. OF OVER-REVOLUTION 1 times
NO. OF LOW BATTERY VOLTAGE 0 times
NO. OF LOW OIL PRESSURE 2 times
NO. OF OVERHEAT(GRADIENT) 22 times
NO. OF OVERHEAT(TEMP.) 3 times
CAUTION SYSTEM NAME (1) Overheat grad.
ENGINE SPEED (1) 719 rpm
MANIFOLD ABSOLUTE PRESSURE (1) 308 mmHg
MANIFOLD ABSOLUTE PRESSURE (1) 41.1 kPa
MANIFOLD ABSOLUTE PRESSURE (1) 12.14 inHg
CYLINDER TEMPERATURE (1) 96 °C
CYLINDER TEMPERATURE (1) 205 °F
INTAKE AIR TEMPERATURE (1) 48 °C
INTAKE AIR TEMPERATURE (1) 118 °F
EX-MANI TEMPERATURE (1) 64 °C
EX-MANI TEMPERATURE (1) 146 °F
FAILURE TIME (1) 1281 h
ELAPSE OF TIME (1) 0 min
CAUTION SYSTEM NAME (2) Overheat grad.
ENGINE SPEED (2) 719 rpm
MANIFOLD ABSOLUTE PRESSURE (2) 304 mmHg
MANIFOLD ABSOLUTE PRESSURE (2) 40.6 kPa
MANIFOLD ABSOLUTE PRESSURE (2) 11.99 inHg
CYLINDER TEMPERATURE (2) 94 °C
CYLINDER TEMPERATURE (2) 201 °F
INTAKE AIR TEMPERATURE (2) 47 °C
INTAKE AIR TEMPERATURE (2) 116 °F
EX-MANI TEMPERATURE (2) 52 °C
EX-MANI TEMPERATURE (2) 126 °F
FAILURE TIME (2) 1287 h
ELAPSE OF TIME (2) 0 min
CAUTION SYSTEM NAME (3) Overheat grad.
ENGINE SPEED (3) 2094 rpm
MANIFOLD ABSOLUTE PRESSURE (3) 271 mmHg
MANIFOLD ABSOLUTE PRESSURE (3) 36.1 kPa
MANIFOLD ABSOLUTE PRESSURE (3) 10.67 inHg
CYLINDER TEMPERATURE (3) 92 °C
CYLINDER TEMPERATURE (3) 198 °F
INTAKE AIR TEMPERATURE (3) 30 °C
INTAKE AIR TEMPERATURE (3) 85 °F
EX-MANI TEMPERATURE (3) 77 °C
EX-MANI TEMPERATURE (3) 170 °F
FAILURE TIME (3) 1288 h
ELAPSE OF TIME (3) 0 min
TOTAL OPERATION TIME (HRS.) 1301 h
TOTAL OPERATION TIME (MIN.) 2 min
0-1000 RPM 23120 min
1000-2000 RPM 11264 min
2000-3000 RPM 16350 min
3000-4000 RPM 2982 min
4000-5000 RPM 21480 min
5000-6000 RPM 2864 min
ABOVE 6000 RPM 2 min
ELAPSE TIME FROM REMINDER CANCEL 88 h
NO. OF OIL CHANGE REMINDER 5 times
COMPENSATION FACTOR (ZONE 1) 1
COMPENSATION FACTOR (ZONE 2) 1
COMPENSATION FACTOR (ZONE 3) 1
TIME OF LAST O2 FEEDBACK 0 h
EMERGENCY STOP SWITCH OFF
CTP SWITCH OFF
NEUTRAL SWITCH ON



Comment
Engine No. 375459-
Boat Type 140
Description stefano
Engine information
Power 140PS
ECM ID 33920-92J10
Spec. ---
Engine Type 4 stroke 2045cc
SERVICE DATA
Item Data Unit
ENGINE SPEED 906 rpm
MANIFOLD ABSOLUTE PRESSURE 245 mmHg
MANIFOLD ABSOLUTE PRESSURE 32.6 kPa
MANIFOLD ABSOLUTE PRESSURE 9.65 inHg
BAROMETRIC PRESSURE 757 mmHg
BAROMETRIC PRESSURE 100.9 kPa
BAROMETRIC PRESSURE 29.83 inHg
CYLINDER TEMPERATURE 71 °C
CYLINDER TEMPERATURE 161 °F
INTAKE AIR TEMPERATURE 38 °C
INTAKE AIR TEMPERATURE 100 °F
BATTERY VOLTAGE 14.72 V
FUEL INJ. PULSE WIDTH 3376 µs
INJECTED FUEL AMOUNT 11 mcc
FUEL PUMP DUTY 56.4 %
IAC VALVE DUTY 25 %
NO. OF MAP SENSOR FAILURE 0 times
NO. OF CKP SENSOR FAILURE 0 times
NO. OF IAC VALVE FAILURE 0 times
NO. OF CMP SENSOR FAILURE 0 times
NO. OF CTP SWITCH FAILURE 1 times
NO. OF CYL. TEMP. SNSR FAILURE 0 times
NO. OF IAT SENSOR FAILURE 2 times
NO. OF EX. TEMP. SNSR FAILURE 1 times
NO. OF FUEL INJECTOR FAILURE 0 times
NO. OF OVER-REVOLUTION 0 times
NO. OF LOW BATTERY VOLTAGE 0 times
NO. OF LOW OIL PRESSURE 0 times
NO. OF OVERHEAT(GRADIENT) 10 times
NO. OF OVERHEAT(TEMP.) 0 times
CAUTION SYSTEM NAME (1) Overheat grad.
ENGINE SPEED (1) 3188 rpm
MANIFOLD ABSOLUTE PRESSURE (1) 571 mmHg
MANIFOLD ABSOLUTE PRESSURE (1) 76.2 kPa
MANIFOLD ABSOLUTE PRESSURE (1) 22.52 inHg
CYLINDER TEMPERATURE (1) 92 °C
CYLINDER TEMPERATURE (1) 198 °F
INTAKE AIR TEMPERATURE (1) 47 °C
INTAKE AIR TEMPERATURE (1) 116 °F
EX-MANI TEMPERATURE (1) 88 °C
EX-MANI TEMPERATURE (1) 191 °F
FAILURE TIME (1) 876 h
ELAPSE OF TIME (1) 0 min
CAUTION SYSTEM NAME (2) Overheat grad.
ENGINE SPEED (2) 5094 rpm
MANIFOLD ABSOLUTE PRESSURE (2) 534 mmHg
MANIFOLD ABSOLUTE PRESSURE (2) 71.2 kPa
MANIFOLD ABSOLUTE PRESSURE (2) 21.05 inHg
CYLINDER TEMPERATURE (2) 94 °C
CYLINDER TEMPERATURE (2) 201 °F
INTAKE AIR TEMPERATURE (2) 48 °C
INTAKE AIR TEMPERATURE (2) 119 °F
EX-MANI TEMPERATURE (2) 57 °C
EX-MANI TEMPERATURE (2) 134 °F
FAILURE TIME (2) 614 h
ELAPSE OF TIME (2) 10 min
CAUTION SYSTEM NAME (3) Overheat grad.
ENGINE SPEED (3) 688 rpm
MANIFOLD ABSOLUTE PRESSURE (3) 230 mmHg
MANIFOLD ABSOLUTE PRESSURE (3) 30.7 kPa
MANIFOLD ABSOLUTE PRESSURE (3) 9.07 inHg
CYLINDER TEMPERATURE (3) 96 °C
CYLINDER TEMPERATURE (3) 205 °F
INTAKE AIR TEMPERATURE (3) 32 °C
INTAKE AIR TEMPERATURE (3) 89 °F
EX-MANI TEMPERATURE (3) 98 °C
EX-MANI TEMPERATURE (3) 209 °F
FAILURE TIME (3) 722 h
ELAPSE OF TIME (3) 0 min
TOTAL OPERATION TIME (HRS.) 1299 h
TOTAL OPERATION TIME (MIN.) 0 min
0-1000 RPM 23610 min
1000-2000 RPM 11072 min
2000-3000 RPM 15880 min
3000-4000 RPM 2794 min
4000-5000 RPM 20950 min
5000-6000 RPM 3616 min
ABOVE 6000 RPM 18 min
ELAPSE TIME FROM REMINDER CANCEL 34 h
NO. OF OIL CHANGE REMINDER 17 times
COMPENSATION FACTOR (ZONE 1) 1
COMPENSATION FACTOR (ZONE 2) 1
COMPENSATION FACTOR (ZONE 3) 1
TIME OF LAST O2 FEEDBACK 0 h
EMERGENCY STOP SWITCH OFF
CTP SWITCH ON
NEUTRAL SWITCH ON

[boats.net]

If the compression test was done with throttle plates open then it is low compression. Would need to run a cylinder leak down test done to see if leaking past valves or pistons.

[silvertriton]

If the compression test was done with throttle plates open then it is low compression. Would need to run a cylinder leak down test done to see if leaking past valves or pistons.

Hi, many thanks, the test was done with no throttle, just turning the engine for a couple of seconds with the starter motor.

[silvertriton]

computer report

I am no expert but the computer report seems ok for the age and engine hours right?

[boats.net]

Report is ok.

[silvertriton]

many thanks Boats.Net

[bezerk]

idle is high should be 700 + or - 50
iac duty should be close to 30% (in netural warmed up)
ctp switch should be on (in netural )
#2 engine is getting pretty high on temp (might have a 70 thermostat ??
70 is not recomend for saltwater.
corroison is this motor biggest proplem a lot depends on good mantance changing zinc's

[silvertriton]

Hi Bezerk, thanks,
How should I interpret in practical terms the discrepancies you mention? should I change the IAC valve or the thermostat?
I can see some corrosion on the steering bracket which I intend to change and superficially on the inside of one of the SS props but the main engine block seems ok...I believe the infamous oxygen/exhaust plug on the engine holder was not changed should I remove it to check? I will check the hidden Zincs at the next service...anything else?