Does anyone know what might prevent my stbd engine from cranking? 28VDC to starter box is good IGN switch starts port engine when switched Throttle position sensor was jumped so it’s not the problem on Pos starts blower and glow plug relay positive Man Mechanic says starters never go bad and it’s not clicking either so no solenoid sound. bad solenoid could be the answer but it seems like it’s a cutoff instead. batteries fully charged as well and power to starter relay is good engines are mechanical type vs electronic The boat does have a Sea-Fire engine interrupt restart system but I don’t have any idea how it interacts
I had this happen on a Predator 68 MKii It was the helm ignition switch. The keyed switch had failed and would not fully turn on the engine management system, so the engine would not start. Bought a new switch at the local electronics store to solve the problem . $10 fix.
Thanks, I’ll try and switch the switches again but I think the engine management system is the problem like you said. I switched the wires from left ignition to the right and it did start the left engine maybe I should switch the right to the left and see if that works
MM, there's no engine management system on your engines, really. The wired black box that you are likely to have on an e/r bulkhead is only a concentrator for routing the probes signals to the instruments, and nothing else. You could even throw it overboard, and the engines will continue to run - just with no working instruments. So, even if I understand what your mechanic said about starters never going bad (having never heard of such occurrence myself), it does sound like it happened to yours. Anyhow, again, since the engines are 100% mechanical, also for your fire system the one and only way to turn them off is by exciting the stop solenoid. Which is something you can also check visually, because it has a pin which is kept pressed inward when the solenoid is excited (=engine off), while an internal spring pops it out automatically when the solenoid is not excited (=engine on). And when it's out, you can also press it manually. It isn't very easy to reach it, because it's directly connected to the HP fuel pump, right inside the two cylinder banks, but your MAN mechanic can surely show you exactly where to look. Which is important, because if by chance the spring that pulls the solenoid out when not excited is a bit worn out, it can stay pressed as if it were excited, and you'd never be able to start the engine again after turning it off. But mind, this is just an aside, because the stop solenoid could be the culprit only if the starter would crank and the engine wouldn't run. If the starter doesn't crank and you are sure it's getting a solid 28V supply, I really struggle to think of any reason aside from a blown starter motor.
I switched the ign switch but didn’t leave the cutout separate. I’ll try that but I think it’s the starter solenoid. intested the Sea-Fire w the tech (good people) and for $500 I’m replacing it anyway. thanks everyone!! Likely the starter and I’ll pull it next week. I was hoping it was just a relay or kill switch but doesn’t seem so.
Hit the starter several times with a hammer and see if it will then start. If it does, it's the starter.
Starter solenoid should be fairly easy to diagnose provided you can access it. Did you try jumping the solenoid with a screwdriver or similar?
That’s a good idea. Old Navy Pilot Trick! If it doesn’t work, hit it!! mill be back on the boat later today and check the last item before pulling the starter. Thanks for everyone’s response. I’ll check the solenoid when I can get to it. Nice that they put it behind the glow plug relay!