MC42 Fuel Filter help & Rocker Cover Gasket needed

[Tony Brooks]

1 hour ago, ditchcrawler said:

You should be able to measure the resistance on the metering between the  contact and to earth with an ohm meter.

and last time I looked ASAP Supplied gave the expected resistance reading for Euro & US gauge systems.

 

Here you go:

Typical Values

 

Typical values for guidance only. Readings will vary from boat to boat

 

 

ALL VOLTDROP TESTS

 

Acceptable except charging systems 0.5V

Ideal 0.3V

Charging systems 0.3 Max but as low as possible

 

 

GLOWPLUG CURRENT – per plug

 

BMC1.5 type 6 amps steady but some now start high

Modern Types Very high dropping to 12 amps when hot

 

 

PRE-ENGAGE STARTER SOLENOID

 

Small connection to case 2 to 3 Ohms

Small connection to motor terminal 1 to 2 Ohms

 

 

“PETROL TYPE” SOLENOID

 

Small connection to case 2 to 3 Ohms

 

 

ALTERNATOR ROTOR

 

From slip ring to slip ring 3 to 4 Ohms

 

 

RELAY COILS

 

Small relays 60 to 150 Ohms

Lucas split charge 50 to 60 Ohms

Durite split charge 30 to 40 Ohms

Albright split charge 10 to 15 Ohms

 

 

INSTRUMENT SENDERS

 

Oil pressure US standard 240 Ohms @ 0 psi > 33 Ohms @ max pressure

Oil pressure European 10 Ohms @ 0 psi > 180 ohms @ max pressure

 

NOTE: The above only applies to modern senders – some older ones “pulse” the signal

 

 

Temperature US Standard 450 Ohms @ 100F > 30 Ohms @ 250F

Temperature European 280 Ohms @ 40C > 22 Ohms @ 120C

 

 

 

Edited January 20, 2021 by Tony Brooks

[Boat_Around_Si]

Thank you - I had a look on ASAP but couldn't find one that matched - I will use Diperk with the engine serial number to make sure I get the correct sensor.