Mariner 4 stroke 40HP intermittant fault

avantimhor · 22 August 2011, 08:33

Engine shuts down into safety mode? for no apparent reason. Switch off and restart and all is fine! Had computer analysis done and no problems show. Any ideas?

uncle al · 22 August 2011, 18:17

is it the 40efi? any alarms sounding?

Portholme · 22 August 2011, 18:43

Long shot this one based on recent experience. Ive got a 2002 60 efi which recently behaved similarly. Turned out to be a blown regulator/ rectifier which is a known fault on 40 50 and 60's. Ran, stopped, ran, stopped.

Telltale apart from not charging was scorch marks on the inside of the cowling

avantimhor · 22 August 2011, 22:32

Yes its a 40efi. No alarms sounding, no faults logged for the computer to identify. I'll check out the regulator/rectifier. Happened again this evening after it had been idling for a while.
Thanks for your input.

tinker · 22 August 2011, 23:00

Oil level low?

avantimhor · 23 August 2011, 07:37

Oil level fine.

uncle al · 24 August 2011, 09:55

it will only go into guardian for either a oil fault (oil pressure switch?) or an overheat first check the thermostate or worse case senario the grommet between the leg and the adapterplate.
regards
alan

avantimhor · 24 August 2011, 20:46

Thanks for that information. Replacement of the thermostat was the first fix tried, and I am beyond "the worst case scenario" as it is now two weeks since a strip down to check the grommet (which was fine, but was replaced anyway). Haven't had a chance yet to check out Portholme's suggestion of the regulator. The fault goes on and the frustration increases!!!

uncle al · 27 August 2011, 13:36

there was a service bulletin out on some voltage regulaters on some of the 40/50/60 hp efi, when i was working (retired now just under a year)i dont know if yours was done/or needed to be done at the time,it might even be out of the period for a warranty repair within the service bulletin time it might be worth checking,you will require your serial number.
regards
alan

Portholme · 27 August 2011, 13:54

Warranty period ended sept 2008. Mine only just blew. Parts labour and vat totalled just under £300

avantimhor · 04 September 2011, 21:13

Thanks Portholme and Uncle al for your input. Uncle al, Carlo says "Hi" & will try to get you on the phone to discuss this one! It's his brick wall!

uncle al · 05 September 2011, 07:32

Hi Carlo i no longer work at barrus i am retired, but all the best and nice to (talk?) to you.
regards
alan